To see the other types of publications on this topic, follow the link: Porous concrete.
Journal articles on the topic 'Porous concrete'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 journal articles for your research on the topic 'Porous concrete.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.
1
Fedyuk, R., A. Baranov, Yu Ilinsky, and Afonso Rangel Garcez de Azevedo. "PERFORMANCES OF HIGH POROUS CELLULAR CONCRETE." Construction Materials and Products 3, no. 5 (December 24, 2020): 5–14. http://dx.doi.org/10.34031/2618-7183-2020-3-5-5-14.
Full textAbstract:
The widespread use of cellular concrete for enclosing structures forces researchers to develop ways to im-prove their performance and durability. Compositions of aerated and foam concrete with the use of waste heat power engineering have been developed. The optimal formulation ratios have been identified that con-tribute to the creation of a rigid interpore matrix and water-repellent pore protection. The regularities of the synthesis of aerated concrete and foam concrete were established, which consist in optimizing the processes of structure formation through the use of a polymineral cement-ash binder and a pore-forming agent. The mix composition intensifies the process of hydration of the system, which leads to the synthesis of a poly-mineral highly porous heterodispersed matrix. The increased activity and granulometry of aluminosilicates predetermine an increase in the number of contacts and mechanical adhesion between particles during com-paction, strengthening the framework of the interpore partitions. The mechanism of the influence of the composition of the concrete mix on the microstructure of the composite is established. The calculated sound insulation of airborne noise shows sufficient characteristics for using aerated concrete blocks as enclosing structures. One of the main advantages of aerated concrete is its low thermal conductivity, which is especial-ly important from the point of view of ensuring the energy efficiency of buildings and structures. Even in spite of the high values of open porosity of the developed aerated concrete, the rigid frame makes it possible to achieve almost 2 times higher frost resistance characteristics than that of the reference specimen
2
Okamoto, T., and S. Naka. "Porous Concrete." Concrete Journal 54, no. 5 (2016): 542–47. http://dx.doi.org/10.3151/coj.54.5_542.
Full text
3
McCain, George N., and Mandar M. Dewoolkar. "Porous Concrete Pavements." Transportation Research Record: Journal of the Transportation Research Board 2164, no. 1 (January 2010): 66–75. http://dx.doi.org/10.3141/2164-09.
Full text
4
Skripkiūnas, Gintautas, and Vitoldas Vaitkevičius. "THE INFLUENCE OF COARSE AGGREGATE CONCENTRATION ON THE STRENGTH OF CONCRETE AND ON THE POROSITY OF CONCRETE MORTAR/STAMBIOJO UŽPILDO KONCENTRACIJOS ĮTAKA BETONO STIPRUMUI IR SKIEDININĖS DALIES PORINGUMUI." JOURNAL OF CIVIL ENGINEERING AND MANAGEMENT 7, no. 6 (December 31, 2001): 446–52. http://dx.doi.org/10.3846/13921525.2001.10531771.
Full textAbstract:
The results of experiments dealing with coarse aggregate concentration influence on the concrete strength and the structure of hardened cement paste and mortar of concrete are presented in the paper. Experiments were performed on concrete with dense coarse aggregate (crushed granite) which strength is more than strength of mortar and lightweight porous aggregate (expanded clay aggregate) with strength less than that of mortar. Physical and mechanical properties of concrete with dense coarse aggregate are presented in Table 1 and the concretes with the porous coarse aggregate in Table 2. The decrease of entrained air content with the increase of coarse aggregate concentration ϕσt were determined both for concretes with dense and porous coarse aggregate. The entrained air has a significant effect on concrete strength—1% of entrained air decreases the strength of concrete about 5% [11]. The influence of the coarse aggregate concentration on the compressive strength of concrete with the constant air content is presented in Figs 3 and 4. With the increase of coarse aggregate concentration the concrete strength decreases when the entrained air content in concrete is constant. The main reasons of the concrete strength reduction are the stress concentration and structural defects near the coarse aggregate. Coarse aggregate affects the structure of mortar. Dense coarse aggregate has negligible water absorption and does not change water content in mortar of concrete, and capillary porosity of mortar remains constant when the concentration of dense coarse aggregate ϕ st increases (Fig 5). Porous coarse aggregate (expanded clay aggregate) has large water absorption (more than 16%), therefore water content in mortar of concrete is reduced and capillary porosity of mortar is significantly reduced when the concentration of porous coarse aggregate ϕ st increases (Fig 5). The entrained air content in mortar with both dense and porous coarse aggregate decreases inverse proportionally to coarse aggregate concentration ϕ st (Fig 6). The investigations have shown that suitable selection of properties and volumetric concentration of coarse aggregate can reduce stress concentration in concrete and increase the concrete strength.
5
Demchyna, B. H., Yu Ye Famuliak, and Kh B. Demchyna. "Modeling of porous concrete elements under load." Selected Scientific Papers - Journal of Civil Engineering 12, no. 2 (December 1, 2017): 79–86. http://dx.doi.org/10.1515/sspjce-2017-0022.
Full textAbstract:
Abstract It is known that cell concretes are almost immediately destroyed under load, having reached certain critical stresses. Such kind of destruction is called a “catastrophic failure”. Process of crack formation is one of the main factors, influencing process of concrete destruction. Modern theory of crack formation is mainly based on the Griffith theory of destruction. However, the mentioned theory does not completely correspond to the structure of cell concrete with its cell structure, because the theory is intended for a solid body. The article presents one of the possible variants of modelling of the structure of cell concrete and gives some assumptions concerning the process of crack formation in such hollow, not solid environment.
6
Plecas, Ilija. "Mathematical modelling of transport phenomena in concrete porous media." Epitoanyag - Journal of Silicate Based and Composite Materials 61, no. 1 (2009): 11–13. http://dx.doi.org/10.14382/epitoanyag-jsbcm.2009.3.
Full text
7
Elizondo-Martinez, Eduardo-Javier, Piergiorgio Tataranni, Jorge Rodriguez-Hernandez, and Daniel Castro-Fresno. "Physical and Mechanical Characterization of Sustainable and Innovative Porous Concrete for Urban Pavements Containing Metakaolin." Sustainability 12, no. 10 (May 21, 2020): 4243. http://dx.doi.org/10.3390/su12104243.
Full textAbstract:
Alternative materials to replace cement in pavements have recently been widely studied with the purpose of decreasing the environmental impacts that the construction industry generates. In this context, the implementation of sustainable urban drainage systems has grown, especially with porous pavements, with the intention to reduce water and environmental impacts. In the present investigation, the addition of alternative materials to minimize the use of cement in porous concrete pavements is evaluated. Starting from a partial substitution of Portland cement with metakaolin, experimental geopolymer concretes were produced with metakaolin and waste basalt powder according to several dosages. Two sets of mixtures were analyzed to evaluate the Porous Concrete Design (PCD) methodology for porous concrete mixtures with alternative materials. A deep analysis was proposed for the evaluation of the mechanical and volumetric properties of the mixtures. Results demonstrated that replacing 5% of cement with metakaolin can increase both permeability and indirect tensile strength. Geopolymer mixtures can achieve permeability significantly higher than the traditional porous concrete, but this decreases their indirect tensile strength. However, considering the promising results, an adjustment in the mix design of the geopolymer mixtures could increase their mechanical properties without negatively affecting the porosity, making these materials a suitable alternative to traditional porous cement concrete, and a solution to be used in urban pavements.
8
Lian, Chun Qi, Zhu Ge Yan, and Simon Beecham. "Evaluation of Permeability of Porous Concrete." Advanced Materials Research 295-297 (July 2011): 873–79. http://dx.doi.org/10.4028/www.scientific.net/amr.295-297.873.
Full textAbstract:
One of the most important characteristics of porous concrete is the ability to capture and transport water. The permeability of porous concrete is therefore needs to be evaluated. This paper will investigate various methods for testing the permeability of porous concrete and compares the different results from falling head and constant head tests. The hydraulic theories were then applied into the analysis to determine the permeability of the porous concrete samples.
9
Ramadhansyah, Putra Jaya, Mohd Yusak Mohd Ibrahim, Hainin Mohd Rosli, and Mohd Haziman Wan Ibrahim. "A Review of Porous Concrete Pavement: Applications and Engineering Properties." Applied Mechanics and Materials 554 (June 2014): 37–41. http://dx.doi.org/10.4028/www.scientific.net/amm.554.37.
Full textAbstract:
Porous concrete technology has been used since 1970s in various parts of the United State as an option to complex drainage systems and water retention areas.Porous concrete pavements have become popular as an effective stormwater management device to control the stormwater runoff in pavement. The objective of this paper is to study a pre-review on Porous concrete pavement and it previous laboratory study. From the literature, it was found that, the strength of the porous concrete pavementstill need to improve. To improve the strength of the porous concrete, various additive have been study as a part of porous concrete mix and yetthe optimum condition to produce good porous concrete still not been established. From the previous study, it was found that to prepare the porous concrete laboratory specimen, the use of standard Proctor hammer (2.5kg) and Pneumatic press (70 kPa compaction effort) resulted in the closest properties to the field porous concrete.
10
Cahya, E. N., R. Haribowo, and E. Arifi. "Inclined porous concrete surface impact on infiltration using recycled concrete aggregate." IOP Conference Series: Earth and Environmental Science 930, no. 1 (December 1, 2021): 012100. http://dx.doi.org/10.1088/1755-1315/930/1/012100.
Full textAbstract:
Abstract Predicting the infiltration rate on inclined surfaces is a pending case, especially when compared to rain intensity. The inclined surface has less ability to generate ponding, leading to higher runoff and higher erosion rates. In the rainy season, on the highway with a very steep slope, erosion usually occurs and becomes very dangerous. By using porous concrete, it is expected to receive higher infiltration and less runoff. This study aimed to determine the impact of the inclined surface of porous concrete on infiltration capacity. The research was conducted using both natural coarse aggregate and recycled coarse aggregate made from concrete waste. The infiltration and permeability test were conducted using porous concrete slabs under 0 to 30% inclined surface. It was shown that the infiltration rate is getting lower as the surface is being steeper. It was also shown that porous concrete made from recycled coarse aggregate has higher performance on permeability and infiltration rate compared to porous concrete made from the natural one.
11
Elguemri, Noureddine, and Ying Fang Fan. "Design and Maintenance of Porous Concrete Pavement." Applied Mechanics and Materials 71-78 (July 2011): 3878–82. http://dx.doi.org/10.4028/www.scientific.net/amm.71-78.3878.
Full textAbstract:
Porous concrete is commonly used by ecologically sound construction companies, since it helps to manage water runoff in sustainable way. Many so-called “green” builders promote the use of porous concrete in their projects [1]. Although porous concrete is a viable material that has the potential to replace the use of traditional concrete pavements in situations where heavy traffic is limited, porous concrete has been predominantly used in non-pavements applications, with only a limited use in pavements applications. This paper provides a clear indication of design and maintenance of porous concrete in pavements applications. Various designs of porous concrete pavement were schematized and explained.
12
Nedbailo, O. M., and O. G. Chernyshyn. "Technological properties of porous concrete autoclave and non-autoclave hardening." Кераміка: наука і життя, no. 3(48) (October 12, 2020): 23–28. http://dx.doi.org/10.26909/csl.3.2020.4.
Full textAbstract:
Some aspects of resource saving problem in the process of construction of heated construction installations are considered in the paper, also heat transfer problem in porouse concrete. Is paid attention to necessity of application with mass construction of habitation of products from porouse concrete, first of all - products from of cellular concrete.
In article the basic requirements of the standard documents regulating constructive properties of various building materials, including various concrete are analysed.
The design a warm wall on the basis of products from porous concrete is considered. Its advantages in comparison with known designs of warm walls are shown.
In article changes of technological properties of various building materials are considered at influence on them of a moisture. The analysis of the standard-regulating documents, concerning operational qualities, concerning reliability and durability of designs is carried out.
The basic technical properties gas-concrete non-autoclave solidification on the basis of a waste stone machining are analysed. Results of researches technology indicators cement cellular concrete non-autoclave solidification with offered filling material are resulted.
13
Ridwan Aldila Melania Care, Frisky, Bambang Sugeng Subagio, Harmein Rahman, and R. Anwar Yamin. "Porous concrete basic property criteria as rigid pavement base layer adjusting field gradation." MATEC Web of Conferences 270 (2019): 03008. http://dx.doi.org/10.1051/matecconf/201927003008.
Full textAbstract:
Porous concrete has been widely used for many purposes in this couple of days. In reality, it might be difficult to create an ideal uniform graded porous concrete mixture proportion with the field gradation circumstances. The aim of this study was to find a porous concrete mix-design proportion that could adjust field gradation and meet Specifications requirements by utilizing continuous graded aggregate. Compressive strength and vertical permeability produced by porous concrete using continuous graded aggregate stayed above the minimum limit for base layer required by Specifications. Continuous graded porous concrete from mix-design variation II produced higher compressive strength, but lower void content and vertical permeability compared to mix design variation I at the age of 28-days. It was found that continuous graded porous concrete from both mix-design variations had an optimum basic parameters in specific value as well. Porous concrete that adjust the field gradation gave a better basic property criteria compared to ideal gradation. The relationship between void content and vertical permeability from continuous graded porous concrete had a similar behavior with uniform graded porous concrete. Overall, the use of continuous graded porous concrete would be very helpful in Indonesia because it can adjust the gradation on the field.
14
Krishnaraj, L., P. T. Ravichandran, M. V.A.Karthik, N. Satheeshram Avudaiyappan, and . "A Study on Porous Sealing Efficacy of hydrophilic Admixture on Blended Cement Concrete." International Journal of Engineering & Technology 7, no. 2.12 (April 3, 2018): 446. http://dx.doi.org/10.14419/ijet.v7i2.12.11514.
Full textAbstract:
The life of the concrete is strongly influenced by durability parameters. The permeability is one of the main characteristics influencing the durability of concrete. The concrete is more permeable due to the ingress of water, oxygen, chloride, sulphate, and other potential deleterious substances. The durability of concrete is mainly affected by pore structure system of concrete and addingthe supplementary cementitious materials (SCM), such as fly ash, slag cement, and silica fume can be decrease permeability. Crystalline technology enhances the strength of concrete by filling the poresand micro-cracks with non-dissolvable substances. To study the efficiency of crystalline formation in concrete in terms of more permeable should be guaranteed through a specific technique.The effectiveness of crystalline waterproofing system with partial replacement cement by GGBS is studiedin terms of strength and durability. The performance of the two different types of crystalline waterproofing integral admixtures has been studied for compressive strength, Split tensile strength, workability, water permeability, Rapid chloride permeability test and porosity in this paper.The early strength increased in GGBS with crystalline admixture concretes compare to the control concrete. No significant strength reduction is observed in GGBS concretes with crystalline admixture when replaced with 20% and 40% of cement than control concrete.
15
Bai, Ai Ming. "Key Construction Technology of Porous Concrete Permeable Base." Applied Mechanics and Materials 587-589 (July 2014): 1162–66. http://dx.doi.org/10.4028/www.scientific.net/amm.587-589.1162.
Full textAbstract:
Porous concrete also be called macropterous concrete or porous lean concrete.As a new base material,it is a lean concrete between cement stabilized macadam and ordinary concrete.Based on Luoyang beltway project,this paper describes the composition design of porous concrete,and discusses the combination of construction machinery,technological process,QCS(quality control specification) and test detection of porous concrete permeable base.Also we do research on many technological parameters such as mixing,paving,molding,maintenance in the construction of porous concrete permeable base.This provides a reference on construction technology and its application.
16
Keawpapasson, Pimpawee, Chayanee Tippayasam, Silawat Ruangjan, Pajaree Thavorniti, Thammarat Panyathanmaporn, Alexandre Fontaine, Cristina Leonelli, and Duangrudee Chaysuwan. "Metakaolin-Based Porous Geopolymer with Aluminium Powder." Key Engineering Materials 608 (April 2014): 132–38. http://dx.doi.org/10.4028/www.scientific.net/kem.608.132.
Full textAbstract:
Porous concretes such as aerated and lightweight concretes are commonly used in construction fields. Lightweight construction materials are used to reduce either the weight or the budget of building structures. Porous concrete production is widely utilised aluminium (Al) powder to increase pores in concrete structures and giving information for porous geopolymer production. It was introduced by adding 0.05-1% Al-powder as the initiated materials of geopolymers, to react with water in those materials and promote hydrogen gas inside specimens. The research, therefore, focused on the synthesis of porous geopolymer by metakaolin as a pozzolan and mixed with alkali solution (8M NaOH and Na2SiO3) as well as Al-powder as a foaming agent. The highly porous geopolymers were produced with various Al-powders as 0%, 0.2%, 0.4%, 0.6% 0.8% and 1% by weight. After 7, 14 and 28 days age, the specimens were tested the mechanical properties, such as compressive and flexural strengths. The water absorption, apparent porosity and bulk density were analyzed at 28 days age. The synthesis of metakaolin-based porous geopolymers with Al-powder presented good results. It showed that Al-powder content affected to degree of porosity of geopolymers. Keywords: Metakaolin based geopolymer, Porous geopolymer, Aluminium powder, Foaming agent, Mechanical and physical properties
17
Meyer, Yuri Alexandre, Izabella Menezes, Rodrigo Silva Bonatti, Ausdinir Danilo Bortolozo, and Wislei Riuper Osório. "EIS Investigation of the Corrosion Behavior of Steel Bars Embedded into Modified Concretes with Eggshell Contents." Metals 12, no. 3 (February 26, 2022): 417. http://dx.doi.org/10.3390/met12030417.
Full textAbstract:
This investigation is focused on evaluation of the corrosion behavior of embedded steel bars (SB) into concretes. Conventional and modified concretes with eggshell are prepared. Although the effect of calcium carbonate on mechanical behavior is recognized and reported, their effects as eggshell (ES) particles replacing portions of sand and cement contents are reasonably scarce. Corrosion behavior is evaluated by electrochemical impedance spectroscopy (EIS) and the potentiodynamic polarization technique. Equivalent circuit and porous electrode behavior are also considered. The novelty concerns a promising use of concrete with ES content to maintain corrosion resistance concatenated with reasonable structural properties. For this purpose, three distinct concrete mixtures are proposed, i.e., a reference and two modified concretes. One replaces 10 wt.% with cement and another 10 wt.% with sand content. It is found that porous electrode behavior helps to predict the corrosion mechanism. Finer ES particles in concrete mixture provides a rapidly passivation on rebar. This reflects positively in corrosion current density after long-term immersion. Additionally, an environmentally friendly aspect associated with economical factor constitutes a promise use of the concrete.
18
Mahdi, Mahdi, Raad Irzooki, and Mazin Abdulrahman. "Developing Porous Concrete Interlocking Pavement Blocks Utilizing Recycled Concrete Aggregate for Rainfall Harvesting Use." TJES: Vol. 28, No.3 28, no. 3 (April 25, 2021): 48–60. http://dx.doi.org/10.25130/tjes.28.3.04.
Full textAbstract:
Rainwater harvesting and flood prevention in cities are significant urban hydrological concerns. The use of porous pavement is one of the most effective solutions to handle this matter. Thus, this study aims to develop Porous Interlocking Concrete Pavement (PICP) using recycled aggregate from concrete waste. This porous pavement, then later, can be utilized in low traffic areas and parking lots to harvest water by infiltration and reduce surface runoff. First, the physical properties of the porous concrete blocks, such as density (unit weight), absorption, coefficient of permeability, and porosity, were studied. Also, the mechanical properties of concrete mixtures like compressive strength and flexural strength were tested. This study used two types of PICP, the first one with ordinary coarse aggregate (P1) and the second with recycled crushed concrete coarse aggregate (P2), and then compared their performance to the conventional concrete pavement blocks used the two types of coarse aggregate (R1 and R2). The results show that the unit weight (density) of porous types was reduced by 25% and 26%, and the total porosity increases by around 2.4 times and 18 times respectively, as compared to conventional concrete pavement types. However, the compressive strength and flexural strength of porous concrete types decreased by (55% and 71%), respectively, compared to conventional types. Overall, the infiltration test results showed that the infiltrated water through porous concrete increased by about 83% in comparison to conventional concrete. From the results, utilizing porous concrete pavement can be considered a promising material in terms of water harvesting and decreasing rainwater flooding. Additionally, using recycled concrete can bring economical and environmental benefits.
19
Abdollahnejad, Zahra, Mohammad Mastali, Mahroo Falah, Tero Luukkonen, Mehran Mazari, and Mirja Illikainen. "Construction and Demolition Waste as Recycled Aggregates in Alkali-Activated Concretes." Materials 12, no. 23 (December 3, 2019): 4016. http://dx.doi.org/10.3390/ma12234016.
Full textAbstract:
The growth of global construction has contributed to an inevitable increase in the amount of construction and demolition (C&D) waste, and the recycling of C&D waste as aggregates in concrete is receiving increased interest, resulting in less demand for normal aggregates and bringing a potential solution for the landfilling of wastes. Recently, several studies have focused on the use of C&D waste in alkali-activated concrete to move one step closer to sustainable concretes. This paper focuses on the main mechanisms of using C&D waste in the resulting physical, mechanical, and durability properties of alkali-activated concrete in fresh and hardened state properties. The main difficulties observed with recycled aggregates (RA) in concrete, such as high levels of water demand, porous structure, and low mechanical strength, occur in RA alkali-activated concretes. These are associated with the highly porous nature and defects of RA. However, the high calcium concentration of RA affects the binder gel products, accelerates the hardening rate of the concrete, and reduces the flowability of alkali-activated concretes. For this reason, several techniques have been investigated for modifying the water content and workability of the fresh matrix and for treating RA and RA/alkali-activated binder interactions to produce more sustainable alkali-activated concretes.
20
Suo, Li Jun, and Xia Guang Hu. "Mechanical Analysis of Porous Concrete Base in Asphalt Pavement." Advanced Materials Research 443-444 (January 2012): 751–56. http://dx.doi.org/10.4028/www.scientific.net/amr.443-444.751.
Full textAbstract:
In China, it is fact that porous concrete base has been used in the construction of asphalt pavement in recent years because porous concrete base has good performance. However, Reasonable design method has not been put forward so far. Therefore, it is necessary to analyze load stress and thermal stress of asphalt pavement which includes porous concrete base in order to put forward theoretical basis for pavement design method. In the paper, three–dimension finite element model of asphalt pavement, which includes porous concrete base and asphalt surface, is created for the purpose of studying load stress and thermal stress of porous concrete base in asphalt pavement. Based on numerical method of three–dimension finite element model, finite element software, such as ANSYS, is employed to study load stress and thermal stress of porous concrete base in asphalt pavement. After that, the effect of different factors on stress is studied, and the factors include thickness of surface, thickness of base and ratio of base’s modulus to foundation’s modulus. Finally, calculation results for stress are compared with each other, and it shows that load stress of porous concrete base decreases with increase of base’s thickness, while thermal stress of porous concrete base increases with increase of base’s thickness. Load stress and thermal stress of porous concrete base decrease with increase of surface’s thickness. Load stress and thermal stress of porous concrete base increase with increase of ratio of base’s modulus to foundation’s modulus.
21
Liu, Qun Di, Jia Ying Sun, and Ying Han. "Research on Performance of Steel Slag and Porous Cement Concrete Made by Steel Slag Aggregate." Advanced Materials Research 214 (February 2011): 306–11. http://dx.doi.org/10.4028/www.scientific.net/amr.214.306.
Full textAbstract:
Porous cement concrete, which has some superiority in environmental protection compared with normal concrete, has been more widely applied. Performance of Steel Slag and influence of the steel slag aggregate on physical and mechanical properties and durability of porous cement concrete were studied in this paper. Based on study of porous cement concrete properties, the paper puts forward several typical pavement structure forms in engineering application of porous cement concrete from finite element analysis method.
22
Elguemri, Noureddine, and Ying Fang Fan. "Workability Characteristics of Porous Concrete in Pavement Applications." Applied Mechanics and Materials 147 (December 2011): 218–22. http://dx.doi.org/10.4028/www.scientific.net/amm.147.218.
Full textAbstract:
Porous concrete dramatically reduces environmental degradation and the negative effects associated with urban sprawl. Porous concrete has been used as an effective method for treating and reducing negative environmental impacts. This paper provides a clear indication of the workability and fresh concrete characteristics in pavement applications. The performance of porous concrete was compared with a concrete sample that is comparable to the material used for the construction of conventional concrete road pavements. The analysis includes the porous concrete mix preparation procedure and the workability tests. The workability tests include the slump, VEBE and compacting factor tests.
23
Purnamasari, E., A. Gazali, and M. B. Januar. "The Effect of Variations of Fly Ash Filling Materials on Porous Concrete Using Local Aggregates from South Borneo." IOP Conference Series: Earth and Environmental Science 999, no. 1 (March 1, 2022): 012002. http://dx.doi.org/10.1088/1755-1315/999/1/012002.
Full textAbstract:
Abstract South Kalimantan has local aggregates that can be used as porous concrete making materials, which is one of the innovations in the infrastructure of environmentally friendly road pavement that serves to drain surface water into the ground. Porous concrete produces a lot of empty space as an air cavity that is 15%-25% of its total volume and also has a slump value that is close to zero. This study uses fly ash filler material as one of the efforts to reduce cement in porous concrete making materials. This research aims to find out the characteristics of the material, the composition of variations of porous concrete mixture, compressive strength and porosity of porous concrete. Testing uses the SNI method which consists of testing cement, fly ash, coarse aggregates and concrete. Concrete testing is done, namely the compressive strenght and porosity of concrete. Based on theresults of research characteristics of cement and fly ash materials have met the specifications of SNI and the results of rough aggregate testing have met the specifications. In porous concrete the fly ash variation of EM0% is obtained the compressive strength is 20.37 MPa and its porosity is 2.34%; in porous concrete the variation of fly ash EM15% obtained the compressive strength of 21.44 MPa and porosity 2.07%, and porous concrete variation fly ash EM30% obtained the compressive strength of 6.05 MPa and porosity by 6.80%. From the results of the analysis, it is found that there is an inverse relationship between compressive strength and porosity. More higher the porosity of the porous concrete, more lower the compressive strength. This happens because the void ratio affects the compressive strength of porous concrete, more greater the void value making higher the porosity value and causes the compressive strength to decrease.
24
Li, Zhu Guo. "Development and Application of Eco-Friendly Concrete." Advanced Materials Research 250-253 (May 2011): 3827–36. http://dx.doi.org/10.4028/www.scientific.net/amr.250-253.3827.
Full textAbstract:
Concrete is the most popular construction material. In its lifetime, natural resources such as limestone and aggregate are consumed. Meanwhile, emission of air pollutants and discharge of waste concrete in large quantities are of great concern. However, in recent years, high performance concrete and new types of concretes have been developed to decrease the environmental burden in its lifespan or in production phase, to utilize a substantial amount of recycled industrial waste, and to improve local environment. These eco-friendly concretes are classified into environmental protection type such as high performance concrete and recycled concrete, and environmental creation type such as porous concrete used for planting and air-purifying concrete with TiO2coating. This paper introduces the concept of eco-friendly concrete and summarizes present technologies and application.
25
Hidayat, Acep, Muhammad Isradi, and Joewono Prasetijo. "GREEN TECHNOLOGY THROUGH POROUS CONCRETE." Review of Behavioral Aspect in Organizations and Society 1, no. 2 (December 14, 2019): 189–94. http://dx.doi.org/10.32770/rbaos.vol1189-194.
Full textAbstract:
This research uses stone ash waste from the stone crusher industry to preserve the environment. This material is an ingredient in making normal concrete. The use of stone ash as a substitute for sand is expected to increase the compressive strength in the planned slump and can optimize the use of rock ash waste to reduce environmental pollution that occurs. This study uses an experimental method with a total of 32 pieces of specimens. Each variation consists of 3 samples with a variety of fine aggregate levels of 40%, 44%, and 46%. The test object is a concrete cylinder with a diameter of 15 cm and a height of 30 cm. Test results for compressive strength at seven days for fine aggregate content variations of 40%: 22.25 Mpa; 44%: 24.30 Mpa; 46%: 17.08 MPa. Test results of compressive strength at the age of 14 days for variations in fine aggregate levels of 40%: 26.10 Mpa; 44%: 28.51 Mpa; 46%: 20.04 Mpa. Test results of compressive strength at the age of 21 days for fine aggregate content variations of 40%: 28.18 Mpa; 44%: 30.78 Mpa; 46%: 21.63 MPa. With these results, the Porous concrete produced can be used as preservation and maintain environmental protection. This product very cheap when compared to the original concrete, which calculated 22 U$ per square. The use of porous concrete has an impact on people's behavior that will preserve the environment, especially water content in the soil.
26
Pshembaev, M. K., V. V. Girinsky, Ya N. Kovalev, V. N. Yaglov, and S. S. Budnichenko. "POROUS STRUCTURE OF ROAD CONCRETE." Science & Technique 15, no. 4 (January 1, 2016): 298–307. http://dx.doi.org/10.21122/2227-1031-2016-15-4-298-307.
Full text
27
Moretti, Laura, Paola Di Mascio, and Ciro Fusco. "Porous Concrete for Pedestrian Pavements." Water 11, no. 10 (October 10, 2019): 2105. http://dx.doi.org/10.3390/w11102105.
Full textAbstract:
Changes in weather patterns directly impact urban transport infrastructures. The increase in temperature and the ongoing precipitation changes should be handled and managed more frequently. In urban areas, most of the soil is impermeable and water hardly infiltrates into the subsoil. Permeable pavement is a technology that helps mitigate the effects of urban heat islands and surface impermeabilization. Porous concrete for pedestrian pavements ensures good structural, functional, and environmental performances. A pervious concrete mix differs from a conventional one in terms of the gradation of aggregates, namely, a lack of fine aggregates. The material porosity (on average 20%) causes compressive and flexural strengths lower than those of traditional concrete. The material is suitable for low-load pavements where the passage of motorized vehicles is forbidden or occasional. The pavement can be laid either monolithically or modularly, using two operating systems: returning water to underground aquifers and reducing runoff. The latter is the most frequently adopted in urban areas, where pedestrian and interdicted to motorized vehicle areas form a continuous and distributed network. In a common urban quarter, where 80% of the surface is impermeable, porous concrete pavements could cover up to 6% of the surface and provide architectural and aesthetic value for the environment.
28
Ginting, Arusmalem, and Suyono. "UTILIZATION OF BLONDOS STONE ON POROUS CONCRETE." Jurnal Teknik Sipil 18, no. 1 (April 1, 2022): 62–74. http://dx.doi.org/10.28932/jts.v18i1.3983.
Full textAbstract:
Porous concrete can be used as a drainage system that allows rainfall to percolate into the ground, reduce stormwater runoff, and recharge groundwater. Porous concrete consists of coarse aggregate and cement paste. Stone mining waste in the river, namely medium-sized gravel which is often called blondos stone, has not been used optimally as a building material. Based on these reasons, it is tried to use blondos stone as coarse aggregate in porous concrete. Three variations of the gravel-cement ratio were used, that is: 4, 5, and 6, and 3 variations of the water-cement ratio, that is: 0.30, 0.35, and 0.40. There are 27 specimens of porous concrete cylinders, and each variation consists of 3 specimens. Permeability and compressive strength testing after 28 days of curing. The conclusions of this study are: increasing the water-cement ratio and gravel-cement weight ratio decreases the compressive strength and increases the permeability of the porous concrete. The water-cement ratio and gravel-cement weight ratio have no significant effect on the density of porous concrete. Blondos stone is adequate to be used for the manufacture of porous concrete.
29
Ramadhansyah, P. J., Mohd Yusak Mohd Ibrahim, Hainin Mohd Rosli, M. Naqiuddin M. Warid, and Mohd Haziman Wan Ibrahim. "Porous Concrete Pavement Containing Nano-Silica: Pre-Review." Advanced Materials Research 911 (March 2014): 454–58. http://dx.doi.org/10.4028/www.scientific.net/amr.911.454.
Full textAbstract:
Porous concrete pavement is being used as one of the solution to decrease the storm water runoff by capturing and allowing rain water to drain into the land surface. The main problem of porous concrete pavement is the strength itself. The objective of this paper is to review the use and performance of nanosilica in porous concrete pavement. From the literature review of the previous research, it was found that the conventional porous concrete pavement doesn't has good strength for pavement purpose. An addition of nanomaterial will improve the physical and chemical properties of the porous concrete pavement.
30
Liu, Wenju, and Jianwen Pan. "Filling Capacity Evaluation of Self-Compacting Concrete in Rock-Filled Concrete." Materials 13, no. 1 (December 25, 2019): 108. http://dx.doi.org/10.3390/ma13010108.
Full textAbstract:
The good filling performance of self-compacting concrete (SCC) to pre-placed assembly of rocks is essential for quality of rock-filled concrete (RFC). In this study, a theoretical model is proposed to evaluate the filling capacity of SCC in porous media that is simplified to approximate the assembly of rocks. Numerical simulation of SCC flow in the porous media is carried out based on the computational fluid dynamics. The effects of yield stress of SCC and size and shape of grains in the porous media on the filling capacity of SCC are considered. The inclination of the free surface of the distribution of SCC at flow stoppage is defined to evaluate the filling capacity of SCC in the porous media. According to the theoretical model, the inclination is directly proportional to the yield stress of the SCC and the blocking effect of grains, while inversely proportional to the grain size. The numerical simulation provides consistent results with the theoretical model. The results suggest the use of rounded large rocks and SCC with low yield stress to ensure good quality of RFC.
31
Miryuk, Olga. "Porous aggregate development for lightweight concrete." E3S Web of Conferences 159 (2020): 06008. http://dx.doi.org/10.1051/e3sconf/202015906008.
Full textAbstract:
The article presents the results of studies of a porous aggregate and lightweight concrete obtained using liquid glass and man-made materials (glass cullet, magnetite ore dressing waste, substandard rocks). Feasibility of a multicomponent feed mixture for pyroplastic swelling of granules is substantiated. Optimization of raw mix composition provided the possibility of combining various formation mechanisms of porous granules. A set of technological solutions has been developed aimed at improving the conditions of molding and hardening of raw granules. A method for preparing a raw material mass is proposed that minimizes structural defects of porous granules. Possibility of capacity reaction of a raw mixture due to mechanical activation of solid components and introduction of sodium additives is proved. Technological conditions for low-temperature expansion of a multicomponent mixture and production of porous granules with a density of not more than 300 kg/m3 are determined. The formula of molding mixture for obtaining lightweight concrete using a porous aggregate is proposed. The use of liquid glass as a binder in a concrete mixture is preferred. The temperature of concrete hardening is recommended. The technology of porous concrete developed implements multifunctional properties of liquid glass, provides the use of technogenic materials, saving of energy resources.
32
Odeyemi, Samson Olalekan. "Mechanical Properties of Granite-Gravel Porous Concrete." International Journal of Engineering Research in Africa 57 (November 9, 2021): 115–23. http://dx.doi.org/10.4028/www.scientific.net/jera.57.115.
Full textAbstract:
The need for porous concrete has become increased due its ability to control surface water, increase the rate of recharging groundwater, and reduce pollution of the ecosystem. Granite is a coarse aggregate that is quite expensive when compared with gravel in Nigeria. Therefore, this research is aimed at optimizing blended granite and gravel in the production of porous concrete. Samples of blended granite-gravel porous concrete of varying mix proportions were produced using cement to aggregate mix ratio of 1:4. The samples were tested for their porosity, workability and compressive strengths. The data collected were analyzed with the aid of Design Expert 10.0. It was observed that the optimal combination for the granite-gravel blended porous concrete is 12% granite, 88% gravel, and a water-cement ratio of 0.66%. This combination gave a porous concrete with a compressive strength of 48.4 N/mm2, percentage porosity of 6% and a compacting factor of 0.91. These values when compared to that of the control specimen revealed that the optimal mix gave a porous concrete with higher porosity, higher workability and a better compressive strength.
33
Li, Zheng Qi. "Study on Properties of Porous Ecological Concrete for Plant-Growing in China." Advanced Materials Research 560-561 (August 2012): 600–605. http://dx.doi.org/10.4028/www.scientific.net/amr.560-561.600.
Full textAbstract:
Porous ecological concrete for plant-growing is a new kind of concrete materials. Its porous texture provides living space for some vegetation’s roots. Because of this, porous ecological concrete can harmonize engineering constructions and environment protections well. The current research situations and engineering applications of this kind of concrete in China are introduced. Both the properties and influencing factors of its physical and mechanical behavior, alkali feature and durability are analyzed. Most of the researches prove that porous ecological concrete surly has broad developing prospect.
34
Arzumanyan, Avetik. "Technological Peculiarities of Non Autoclaved Foam Concrete Production on the Base of Volcanic Pumice Aggregates." Materials Science Forum 974 (December 2019): 206–10. http://dx.doi.org/10.4028/www.scientific.net/msf.974.206.
Full textAbstract:
Armenia is known for its large reserves of various volcanogenic tuff, pumice and slag natural porous active rocks, which due to their favorable technical properties are also interesting from the point of view of using as aggregates for foam concretes. In this research first of all the types of volcanic pumice rocks having the greatest activity and porosity are considered. At the same time, a relatively dense and chemically active lithoidal variety of pumice was used as a fine, and a highly porous Ani type pumice as a coarse aggregate. The use of coarse aggregates is unacceptable in foam concretes, but in this case, taking into account that the Ani type pumice has an average density of 350-500 kg/m2, which is equivalent with foam concrete, it was decided to test as a coarse aggregate in the form of grains up to 20 mm in size. With proper dose selection, along with a positive reinforcement effect and reduction of shrinkable deformations, it will simultaneously reduce the cost of concrete by reducing the consumption of the most valuable cement component. Experience has shown that existing methods for foam concrete mixture production are not acceptable for such concretes, therefore, in order to prevent high quantity of water absorption and weighting of highly porous coarse aggregates, resulting in foam suppression and other negative consequences, there was a need to develop foam concrete mixture technology, which is presented in this research.
35
Grigoryan, Vardges, and Vahan Grigoryan. "Enriching Methods of Porous Fillers." Key Engineering Materials 828 (December 2019): 100–105. http://dx.doi.org/10.4028/www.scientific.net/kem.828.100.
Full textAbstract:
The work relates to introduce the quality improvement of construction materials, in particular the enrichment of macadam which is one of the main constituents of concrete. The proposed technology improves the quality of the concrete without essential equipment transformation. As a result, the broken stone acquires physic-mechanical and qualitative new properties, increases concrete strength, and decreases the unit of cement in concrete consumption.
36
Jin, Lu, and Zhu Ge Yan. "A Markov Chain Monte Carlo Technique Based Optimal Mix Design of Porous Concrete." Applied Mechanics and Materials 357-360 (August 2013): 959–62. http://dx.doi.org/10.4028/www.scientific.net/amm.357-360.959.
Full textAbstract:
Porous concrete is one of the innovative and promising concrete products, which is featured with a relatively high water permeability rate. Compared with conventional concrete products, due to the lack of fine aggregates in the mix design of porous concrete, the void spaces between the coarse aggregates remains unfilled and causes a large amount of porosity in the hardened concrete mass. On the other hand, the strength of porous concrete is usually lower than that of the conventional concrete products due to the lack of fine aggregates. For the purpose of achieving a relatively high strength of porous concrete while maintaining a good permeability of pavements, the mix design of porous concrete is modeled as a Markov Chain Monte Carlo (MCMC) system and a Gibbs Sampling method based approach is developed to approximate the optimal mix design. The simulation results show that, by using the proposed approach, the system converges to the optimal solution quickly and the derived optimal mix design achieves the tradeoff between the compressive strength and the permeability rate.
37
Hazairin, Erma Desmaliana, Bernardinus Herbudiman, and Wira Yudha Saputra. "Mechanical properties of porous concrete with variations of coarse aggregate gradation." MATEC Web of Conferences 276 (2019): 01027. http://dx.doi.org/10.1051/matecconf/201927601027.
Full textAbstract:
Porous concrete is an innovation in sustainable concrete technology, which has high porosity concrete without fine aggregate. Porous concrete used in rain gardens, planter boxes, permeable pavements at urban open spaces could absorb rainwater so it can reduce run-off. This experimental study purposes to determine the compressive, split-tensile, flexural strengths, and permeability of porous concrete with various gradation of coarse aggregates. This study used a concrete mixture with coarse aggregate gradation variations of gap, continuous, and uniform on the water cement ratio of 0.4. The test specimens used three cylinders of 15x30cm for compressive and split-tensile strengths, except for uniform gradations used three cylinders of 10x20cm. Beam specimens of 15x15x60cm used for bending strength test by third point loading method. The tested mechanical properties are 7, 14, and 28 days-compressive strengths, 28 days split-tensile strength, and 28 days bending strength. The experimental results also show the average compressive strengths of porous concrete with variation of gradations of gap, continuous, and uniform for 28 days is 14.6 MPa, 13.0 MPa, and 10.6 MPa, respectively. Volumetric flow rate of porous concrete with gap, continuous, and uniform aggregate gradations is 28.4 ml/s, 32.1 ml/s, and 39.3 ml/s, respectively. The experimental results show that gap gradation is recommended due to its better compressive and flexural strengths. In porous concrete, aggregate gradations influence the air content. The highest air content results the lowest compressive strength of concrete. The designed air content should be controlled to maintain the expexted compressive strength of porous concrete.
38
Yang, Z. X., Kyu Hong Hwang, Jeong Bae Yoon, J. O. Kim, and M. C. Kim. "Properties of Permeable Concrete Substrate Having Dual Pore Structures." Materials Science Forum 569 (January 2008): 233–36. http://dx.doi.org/10.4028/www.scientific.net/msf.569.233.
Full textAbstract:
Porous concretes with continuous voids have been gaining more interest as an ecological material because of their useful functions such as water permeability and adsorption ability. Especially, to make porous concrete much more environmentalized, micropores play a role of nest for microorganism and germs to live in. So micropore distribution and the size of micropores especially open pores are the key point . In this study, the size and distribution of micropores of porous concrete were effected by the AE agents to the cement pastes and then by the treating types, treating times, treating temperatures, and the vacuum pressure during the treating. And another group specimens were added sodium bicarbonate and alum. And then physical properties were examined, digital microscope was also used to observe the micropores sizes and distributions. Cracks were observed on the cement-aggregate joint when the amount and vacuum pressure increased. And high treating temperature shows no good on the bonding of cement paste and aggregate.
39
Tang, Van Tai, and Kannan Pakshirajan. "Novel advanced porous concrete in constructed wetlands: preparation, characterization and application in urban storm runoff treatment." Water Science and Technology 78, no. 11 (December 28, 2018): 2374–82. http://dx.doi.org/10.2166/wst.2018.528.
Full textAbstract:
Abstract Common porous concrete templates (CPCT) and advanced porous concrete templates (APCT) were employed in this study to construct wetlands for their applications in pollutant removal from storm runoff. The planting ability of the concrete was investigated by growing Festuca elata plants in them. Strength of the porous concrete (7.21 ± 0.19 Mpa) decreased by 1.8 and 4.9% over a period of six and 12 months, respectively, due to its immersion in lake water. The height and weight of Festuca elata grass growth on the porous concrete were observed to be 12.6–16.9 mm and 63.4–95.4 mg, respectively, after a duration of one month. Advanced porous concrete template based constructed wetland (APCT-CW) showed better removal of chemical oxygen demand (COD) (49.6%), total suspended solids (TSS) (58.9), NH3-N (52.4%), total nitrogen (TN) (47.7%) and total phosphorus (TP) (45.5%) in storm water, when compared with the common porous concrete template based constructed wetland (CPCT-CW) with 20.6, 29.8, 30.1, 35.4 and 26.9%, respectively. The removal of Pb, Ni, Zn by the CPCT-CW unit were 28.9, 33.3 and 42.3%, respectively, whereas these were 51.1, 62.5 and 53.8%, respectively, with the APCT-CW unit. These results demonstrate that the advanced porous concrete template in constructed wetland could be employed successfully for the removal of pollutants from urban storm water runoff.
40
Man, Du La. "Study on Affection of the PVA Fiber on Recycled Coarse Aggregate to Porous Concrete Performance." Applied Mechanics and Materials 438-439 (October 2013): 304–8. http://dx.doi.org/10.4028/www.scientific.net/amm.438-439.304.
Full textAbstract:
Pervious concrete is one kind of porous concrete which has skeleton structure. In this test the recycled coarse aggregate replacement ratio is 30%, by using recycled coarse aggregate which through high quality processing replaces ordinary coarse aggregate and adding PVA fiber (the mass of PVA fiber respectively are 0%, 0.5%, 1.0% and 1.5% of the cement), the influences of PVA fiber on the strength, effective porosity and permeable coefficient of porous concrete are studied. Besides, the dry shrinkage property and temperature contraction property of porous concrete are discussed. The results can provide the basis for the design and application of the recycled coarse aggregate porous concrete.
41
Zhao, Caiyou, Ping Wang, Li Wang, and Dan Liu. "Reducing Railway Noise with Porous Sound-Absorbing Concrete Slabs." Advances in Materials Science and Engineering 2014 (2014): 1–11. http://dx.doi.org/10.1155/2014/206549.
Full textAbstract:
The effect of porous sound-absorbing concrete slabs on railway noise reduction is examined in this paper. First, the acoustical absorption coefficients of porous concrete materials with various aggregate types, gradations, fibre contents, and compaction indexes are measured in the laboratory. The laboratory results show that porous concrete that uses a composite of expanded perlite and slag as aggregate can not only obtain good acoustical absorption properties but also satisfy mechanical requirements. Also, the gradation of the combined aggregate has a significant effect on the acoustic absorption performance of the porous concrete, with an optimal aggregate gradation of 1~3 mm. Furthermore, the fibre content and compaction index affect both the strength and the acoustic absorption property of the porous concrete, with the optimum value of 0.3% and 1.6, respectively. Then, the findings from the laboratory studies are used to make porous sound-absorbing concrete slabs, which are applied in a test section. The measurements indicate that porous sound-absorbing concrete slabs can significantly reduce railway noise at different train speeds and that the amount of the noise reduction changes roughly linearly with speed when the train is traveling at less than 200 km/h. The maximum noise reduction is 4.05 dB at a speed of 200 km/h.
42
Laukaitis, Antanas, and Laima J. Kunskaitė. "INVESTIGATION INTO LOW DENSITY POROUS CONCRETE PENETRABILITY BY AIR/MAŽO TANKIO AKYTOJO BETONO ORO LAIDUMO TYRIMAI." JOURNAL OF CIVIL ENGINEERING AND MANAGEMENT 2, no. 7 (September 30, 1996): 41–45. http://dx.doi.org/10.3846/13921525.1996.10531654.
Full textAbstract:
Low-density (250–350 kg/m3) porous concrete has good thermal insulation and acoustical properties. However, the determination of these properties requires a lot of time and is rather costly. Changes in these properties can be determined, if the porous concrete air penetrability, which can be simply found, is known. This paper deals with porous concrete made using Portland cement binder and a binder mixture (lime + Portland cement), as well as with foam concrete air penetrability coefficient value dependency on its density and water/dry solids ratio V/K. The raw materials composition is given in Table 1. Fig. 1 represents the air penetrability determination apparatus scheme. Air penetrability increases with a decrease of density in porous concrete sample. For example, when V/K=0.6 and product density decreases from 490 to 310 kg/m3, the air penetrability coefficient increases from 2.5·10−7to 13.1·10−7 m3/m·S·Pa. Porous concrete air penetrability increases with an increase in V/K (Fig. 2.). The air penetrability coefficient increases from 6·6·10−7 to 12.8·10−7 m3/m·S·Pa when the product density is 350 kg/m3 and V/K changes from 0.5 to 0.7. Changes in V/K have a greater influence on low density porous concrete air penetrability. That is why, when slowly hydrating Portland cement is used for porous concrete production, foaming formation mixture temperature is not high, it binds and is cured very slowly. For higher density product pore structures such a slow curing process does not have any effects, because small, spherical pores prevail. When the water content is increased in the formation mixture, a change in product porous structure is observed, because larger deformed coupled pores are formed and therefore the air penetrability increases. An air penetrability dependency on product density and V/K regression equation (3) is given. Air penetrability coefficients of porous concrete made using a mixed binder (lime + Portland cement) are given in Table 2. It has been established, that a 20% Portland cement equivalent amount of lime in the binder mixture according to equation 1 and when the V/K ratio increased from 0.52 to 0.65, the some density product air penetrability coefficient of equal density products increased by 3 times, while the lime content in the binder increased from 20 to 80% from formation mixture samples with V/K ratio =0.52. Air penetrability of porous concrete made using a mixed binding material also depends on concrete density and formation mixture V/K ratio (Fig. 3.). Cellular concrete air penetrability coefficient values are given in Fig. 4. Cellular concrete differs from porous concrete, because its air penetrability coefficient values decrease with an increase in V/K ratio. This is the reason why cellular concrete air penetrability coefficients are lower than those of porous concrete. Cellular concrete air penetrability coefficient dependency on product density and V/K ratio is expressed by equation 4.
43
Ni, Tong Yuan, Chen Hui Jiang, Hui Xing Tai, and Guo Qing Zhao. "Experimental Study on Sound Absorption Property of Porous Concrete Pavement Layer." Applied Mechanics and Materials 507 (January 2014): 238–41. http://dx.doi.org/10.4028/www.scientific.net/amm.507.238.
Full textAbstract:
In this paper, Sound absorption property tests of porous concrete pavement specimens which porosity of 15%, respectively, 17%, 20%, 22%,25% and a thickness of 40mm, 50mm, 60mm have been done by standing wave tube in different frequencies. The experimental results showed that the different porosity specimens sound absorption capacity shows little difference in low-frequency sound. As the porosity of porous concrete pavement layer specimen increases, the absorption coefficient increases. Under the same porosity as the porous concrete pavement thickness increases, the sound absorption coefficient in low-frequency tends to increase, and in high-frequency, it tends to decrease. The mix design of porous concrete pavement should be considered about permeability, strength, acoustic performance and other factors. The paper recommends porous concrete pavement porosity ranges 17-22%.
44
Laukaitis, Antanas, and Vytautas Lasauskas. "AKYTOJO BETONO GARSO ABSORBCIJOS TYRIMAI/POROUS CONCRETE SOUND ABSORPTION INVESTIGATION." JOURNAL OF CIVIL ENGINEERING AND MANAGEMENT 2, no. 8 (December 31, 1996): 67–72. http://dx.doi.org/10.3846/13921525.1996.10590174.
Full textAbstract:
Low-density porous concrete can be used as a sound absorbing material. This paper generalizes porous concrete sound absorption investigations. Porous concrete relative wave resistance modulus is longer than air wave resistance W=1 and that is why this material can be ascribed to materials with a high resistance to air flows, i.e. materials with a satisfactory sound absorption. Various thickness porous concrete sample sound absorption coefficients can be calculated according to equations (1), (2), (3), when wave parameter values are determinated (Table 1). Normal sound absorption coefficient measurement results (Fig. 1) show that for 35 mm and thicker samples the coefficient does not vary. It means that the samples apparent resistance (impleance) coincides with the materials wave resistance. The sound absorption coefficient increases (Fig. 2) with a decrease in porous concrete density. The asymmetric average dependency is expressed by a rectilinear curve (Fig. 3). The sound absorption coefficient depends not only on porous concrete density, but also on its nature (Fig. 4). The different sound absorption coefficient values for uniform density porous concrete can be explained by the various structure of porous concrete products, i.e. a change in pore dimensions, their amount and distribution (Fig. 5, Table 2). The production of acoustical slabs has shown that 280350 kg/m3 density porous concrete products are not sufficiently strong. It was therefore decided to increase their density to 460 kg/m3, with the purpose of increasing the sound absorption coefficient by using various special form resonators (cavity-type accelerators). The influence of the cuts on sound absorption is given in Fig. 6 (cut step is 22 mm). Measurements in a reverberation chamber have shown that the sound absorption coefficient value in porous concrete slabs with deeper or complex cuts increases, but it is harder to produce slabs with complex form cuts. It is easier to make a simple form resonator. Reverberated sound absorption for regular form resonators is given in Fig. 7. Porous concrete slab surface acoustical resistance decreases due to cuts and that is why there is an increase in sound absorption coefficients (Fig. 7, 2 and 3 curves).Porous concrete slabs with resonator cuts on both sides can be used in spacious constructions, for noise absorption in industrial premises. In this case, the construction sound absorption coefficient depends on the lay-out of these slabs. Three types of special lay-outs were investigated (Fig. 8, Table 3). Most of the investigated constructions have revertible sound absorption coefficients higher than 1. This is explained by sound diffraction phenomena on the slab edges. The most effective of all the investigated constructions are those where porous concrete slabs with two-sided perforations are hung jointly (Fig. 8, curves 6 and 10). They are effective in the entire distance between the slabs. The reverberation absorption coefficient decreases for all types of constructions (Fig. 8, curves 1 and 2, 5 and 6, 7–10). The special construction sound absorption coefficient can be changed by selecting porous concrete slab lay-out.
45
Bai, Er-Lei, Jin-Yu Xu, Song Lu, Ke-Xin Lin, and Yi-Ming Zhang. "Comparative study on the dynamic properties of lightweight porous concrete." RSC Advances 8, no. 26 (2018): 14454–61. http://dx.doi.org/10.1039/c8ra00082d.
Full text
46
Sánchez-Mendieta, Carlos, Juan Jose Galán, and Isabel Martinez-Lage. "Physical and Hydraulic Properties of Porous Concrete." Sustainability 13, no. 19 (September 23, 2021): 10562. http://dx.doi.org/10.3390/su131910562.
Full textAbstract:
The work presented includes a review of the state of art of porous concrete. Its purpose is to evaluate the potential use of porous concrete in constructions where the level of surface runoff justifies it. A review of the literature presented here has been necessary where parameters of special consideration have been defined in the dosage of permeable mixtures. The study includes the definition of porous concrete in terms of its main components: cement, coarse aggregate, water, additives, and sand, in little or no quantity, to cause the generation of an effective content of interconnected voids that allow rapid storm drainage. Given the reports of variables of high incidence in the mechanical behavior of porous concrete (resistance/permeability relationship), an investigation is warranted to synthesize the effects of the variables in the preparation of the mixture: water–cement ratio, granulometry, and morphology of the aggregates, compaction pressure, and curing techniques, among others. Likewise, the protocols for the characterization of porous concrete and additional aspects relevant to support the experimental phase are exposed, constituting a reference or anchor point for developing technologies associated with the manufacture of this material and the possibilities of its implementation in constructions.
47
Clementino, Fabio de Souza, Jéssica Machado Santiago, Heitor Fernandes de Sousa, Italo Gutierry Carneiro da Conceição, and Hudson Chagas dos Santos. "Uso de concreto permeável com aditivos no tratamento de águas residuárias, com enfoque no biocarvão: uma revisão." Research, Society and Development 10, no. 10 (August 19, 2021): e562101019111. http://dx.doi.org/10.33448/rsd-v10i10.19111.
Full textAbstract:
Nos grandes centros urbanos, a constante impermeabilização das vias intensifica alagamentos e enchentes, gerando inúmeros transtornos à população. O uso do concreto permeável como mecanismo de drenagem de águas pluviais e residuárias tem sido uma solução parcial para esse tipo de problema de drenagem, inclusive com a adição em sua composição de materiais com propriedades adsorventes que visem a melhoria de parâmetros físico-químicos e biológicos da água. Portanto, este artigo tem como objetivo geral trazer importantes resultados de diversos estudos utilizando concreto permeável com adições minerais e mostrar os benefícios nas propriedades mecânicas e adsorventes desse tipo de concreto, com ênfase na utilização do biocarvão. Para isso, optou-se como metodologia, fazer uma breve revisão da literatura, no qual foram analisadas pesquisas concluídas disponíveis em base de dados online como Scopus, Science Direct a partir do ano de 2015 utilizando como descritores em inglês: “Concrete” AND “Biochar”, “Concrete porous” AND “Biochar”, “Pervious concrete” AND “Biochar”, “Treatment of water” AND “Concrete porous”, “Cementitious materials” AND “Biochar”. Foram selecionadas 51 referências sendo assim especificados: 48 artigos científicos, 1 norma e 2 capítulos de livros. Constatou-se que a adição de minerais adsorventes e biocarvão no concreto podem promover melhoria de parâmetros de qualidade da água como diminuição de turbidez, nitrogênio totais (NT), Fósforo Totais (PT), DQO, DBO, entre outros, e promoverem, em alguns casos, ganho de resistência mecânica dos concretos produzidos.
48
Emeljanova, Inga, Denys Chayka, Viktor Bondar, and Viktor Virchenko. "Concrete pump working capacity determination in the composition of small-sized technological set equipment for the wet method gunite work." ACADEMIC JOURNAL Series: Industrial Machine Building, Civil Engineering 2, no. 51 (October 12, 2018): 166–70. http://dx.doi.org/10.26906/znp.2018.51.1310.
Full textAbstract:
The small-sized technological set equipment with a universal, non-porous hose concrete pump is shown, that is verified during the execution of wet method gunite work. Dependencies for determination of basic universal hose concrete pump work parameters are proposed. The stand surface concreted with wet-cracking method, by the using of the concrete mixture composition, which has been checked during the gunite work execution on the construction site. A check of the resulting rubber-concrete coating strength has been carried out. The stability of the offered technological package operating conditions is confirmed.
49
Li, Xiao Peng, Shao Feng Lin, Xu Liang Lv, Lei Zhao, and Liu Qiang Wen. "Influences of Aggregate on Microwave Absorbing Properties of Porous Concrete." Advanced Materials Research 648 (January 2013): 31–34. http://dx.doi.org/10.4028/www.scientific.net/amr.648.31.
Full textAbstract:
The key factors for reflection loss of porous materials were studied mainly through experimentation. Regarded aggregate particles as polydisperse particles in porous concrete, by introducing Mie solution on scattering by a spherical particle, and combining with independent scattering discipline for polydisperse particles, a theoretical method for calculating microwave absorbing properties of porous concrete with aggregate diameter in logarithm normal distribution is presented, which can forecast the absorption properties of porous concrete preferably.
50
Hadipramana, Josef, Abdul Aziz Abdul Samad, Ahmad Zaidi Ahmad Mujahid, Noridah Mohamad, and Fetra Venny Riza. "Contribution of RHA Granules as Filler to Improve the Impact Resistance of Foamed Concrete." Key Engineering Materials 594-595 (December 2013): 93–97. http://dx.doi.org/10.4028/www.scientific.net/kem.594-595.93.
Full textAbstract:
Foamed concrete as aerated concrete widely used in range of constructions application, no exception to structure shield. As structure shield is important to resist on impact loading. Whilst, Rice Husk Ash (RHA) as agro-waste potentials as filler for foamed concrete. RHA that is produced by uncontrolled burning under 700oC during ± 6 hours obtain the granules contain the carbon and porous. The granules of RHA may fill the porous in matrix foamed concrete without remove the characteristic the foamed concrete its self-as aerated concrete. This investigation RHA has been used as a replacement for fine aggregate. Target density 1800 kg/m3of foamed concrete both of with and without RHA have been produced to compare their strength and characteristic of impact resistance. SEM and EDS test has been conducted to determine microstructure and chemical composition of foamed concrete with RHA. The results showed that granules of RHA filled the porous and bonded with the denser part into matrix. The presence of granules of RHA has been changing the role of the air cell of porous in foamed concrete when it was subjected to impact loading. Also the granules of RHA give the foamed concrete denser without losing its characteristic of porous entirely.