Relevant bibliographies by topics / Recycled Aggregate Concrete (RAC)

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Recycled Aggregate Concrete (RAC)'

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Published: 20 February 2023

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Journal articles on the topic "Recycled Aggregate Concrete (RAC)"

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Okechi, Ikechukwu K., Federico Aguayo, and Anthony Torres. "Coefficient of Thermal Expansion of Concrete Produced with Recycled Concrete Aggregates." Journal of Civil Engineering and Construction 11, no. 2 (May 15, 2022): 65–74. http://dx.doi.org/10.32732/jcec.2022.11.2.65.

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This study presents a comparison between the coefficient of thermal expansion (CTE) of concrete produced with natural aggregate and that of concrete produced with recycled concrete aggregate. In order to achieve this, natural aggregate concrete (NAC) specimens were produced, tested, then crushed and sieved in the laboratory to obtain recycled concrete aggregates, which was then used in the production of recycled aggregate concrete (RAC) specimens. The RAC samples were then tested and compared to the NAC samples. The CTE testing was carried out using a AFTC2 CTE measurement system produced by Pine Instrument Company. In addition to CTE testing, the water absorption, specific gravity, and unit weight of the aggregates was determined. A vacuum impregnation procedure was used for the water absorption test. The recycled aggregate properties showed a significantly higher absorption capacity than that of the natural aggregates, while the unit weight and specific gravity of the recycled aggregate were lower than that of the natural aggregates. The average CTE results showed that both the NAC and the RAC samples expanded similarly. The results show that the CTE of RAC depends on the natural aggregate used in the NAC, which was recycled to produce the RAC. Also, there was no significant difference between the average CTE values of the RAC and that of NAC that could discredit the use of recycled aggregate in concrete.
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Węglorz, Marek, Andrzej Ajdukiewicz, and Alina Kliszczewicz. "Assessment of recycled concrete aggregate properties required for structural concretes." MATEC Web of Conferences 262 (2019): 06010. http://dx.doi.org/10.1051/matecconf/201926206010.

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Assessment of recycled aggregate concrete (RAC) properties by laboratory tests is still required due to lack of precise guidelines and with taking into account slightly different behaviour of such concretes in comparison with natural aggregate concretes (NAC). It is especially important when recycled concrete aggregates are used for the structural elements. In this paper, the following rules for the whole concrete recycling cycle were defined: (1) rules for examination of original concretes selected for recycling and (2) rules for aggregate preparation and their fractionize as well as design rules for recycled aggregate concrete mixtures (including required tests of recycled aggregates and concrete properties). Requirements towards recycled aggregate concrete formulated in this paper are based on the long term experience and research works on the RAC which were held by A. Ajdukiewicz and A. Kliszczewicz in the Department of Structural Engineering of the Silesian University of Technology, practically since 1995.
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Zhu, Ping Hua, Xin Jie Wang, and Jin Cai Feng. "On Properties of Recycled Coarse Aggregate from Repeatedly Recycling Waste Concrete." Advanced Materials Research 368-373 (October 2011): 2185–88. http://dx.doi.org/10.4028/www.scientific.net/amr.368-373.2185.

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The properties of recycled coarsee aggregates from repeatedly recycling waste concrete were determined. In this study, five series of concrete mixtures using coarse and fine natural aggregates were prepared, which have the same objective slump value from 35mm to 50mm and different compressive strengths ranging from 25MPa to 60 MPa. These five concretes were crushed, sieved, washed with water, hot treatmented at 300°C before they were used as recycled aggregates. After that, recycled aggregate concrete (RAC) was produced with an objectively compressive strength of 30MPa, in which the recycled coarse aggregate was used as 30%, 70% and 90% replacements of natural coarse aggregate and recycled fine aggregate as 10%, 20%, and 30% replacements of natural fine aggregate. After that, these recycled concretes were used as second recycled aggregates to produce RAC with the same objectively compressive strength of 30MPa. The physical properties of coarse aggregates including apparent density, water absorption, attached mortar content and crushing value were tested and their mineral characteristics were analyzed. The results showed that the quality of recycled coarse aggregates from twicely recycling waste concrete reached the requirements from structural concrete.
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Tenório, J. J. L., P. C. C. Gomes, C. C. Rodrigues, and T. F. F. de Alencar. "Concrete produced with recycled aggregates." Revista IBRACON de Estruturas e Materiais 5, no. 5 (October 2012): 692–701. http://dx.doi.org/10.1590/s1983-41952012000500006.

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This paper presents the analysis of the mechanical and durable properties of recycled aggregate concrete (RAC) for using in concrete. The porosity of recycled coarse aggregates is known to influence the fresh and hardened concrete properties and these properties are related to the specific mass of the recycled coarse aggregates, which directly influences the mechanical properties of the concrete. The recycled aggregates were obtained from construction and demolition wastes (CDW), which were divided into recycled sand (fine) and coarse aggregates. Besides this, a recycled coarse aggregate of a specific mass with a greater density was obtained by mixing the recycled aggregates of the CDW with the recycled aggregates of concrete wastes (CW). The concrete was produced in laboratory by combining three water-cement ratios, the ratios were used in agreement with NBR 6118 for structural concretes, with each recycled coarse aggregates and recycled sand or river sand, and the reference concrete was produced with natural aggregates. It was observed that recycled aggregates can be used in concrete with properties for structural concrete. In general, the use of recycled coarse aggregate in combination with recycled sand did not provide good results; but when the less porous was used, or the recycled coarse aggregate of a specific mass with a greater density, the properties of the concrete showed better results. Some RAC reached bigger strengths than the reference concrete.
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Zhu, Ping Hua, Xin Jie Wang, and Jin Cai Feng. "Durable Performance of Recycled Concrete Using Coarse and Fine Recycled Concrete Aggregates in Air Environment." Advanced Materials Research 261-263 (May 2011): 446–49. http://dx.doi.org/10.4028/www.scientific.net/amr.261-263.446.

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The influence of synchronous use of coarse and fine recycled concrete aggregates on durable performance of recycled aggregate concrete (RAC) in air environment were determined. In this study, three series of concrete mixtures were prepared, in which the coarse recycled aggregate was used as 0%, 30%, 60% and 90% replacements of coarse natural aggregate and fine recycled aggregate as 0%, 10%, 20%, and 30% replacements of fine natural aggregate. Meanwhile, fly ash and slag were used as 15%, 25%, 35% and 45% replacements of cement, respectively. The carbonation depths, compressive cube strength, workability of RACs were tested. The experimental results showed that RAC with synchronous use of coarse and fine recycled concrete aggregates had satisfactory durable performance. When RAC was used as structural concrete in air environment, the optimum synchronous replacements are 60% for coarse recycled aggregate and 20% for fine recycled aggregate.
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Zhu, Ping Hua, and Yi Lei. "Research on Strength Properties of Concrete Using Aggregates from Repeatedly Recycling Concrete Waste." Applied Mechanics and Materials 665 (October 2014): 147–50. http://dx.doi.org/10.4028/www.scientific.net/amm.665.147.

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The strength properties of recycled aggregate concrete (RAC) using aggregates from repeatedly recycling concrete waste were studied. The relationships between cube compressive strength and splitting tensile strength and between each strength and replacement ratio of recycled aggregate to natural aggregate were established. The results showed that the strength properties of RAC with the design strength of 30MPa can be satisfied when the quality of recycled coarse and fine aggregates met respectively the needs of Grade II in GB/T25177-2010 and Grade III in GB/T25176-2010, with the replacement ratio to natural coarse aggregate and natural fine aggregate no more than 70% and 50%. Both strengths decreased and then increased for a while before descending again with increasing replacement ratio of recycled coarse aggregate, and decreased continuously with the increase of replacement ratio of recycled fine aggregate. The relationship between cube compressive strength and splitting tensile strength of RAC was found to be exponential function.
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Yan, H. Q., and Qing Yuan Wang. "Experimental Research on Fatigue Behavior of Recycled Aggregate Reinforcement Concrete from Earthquake-Stricken Area." Advanced Materials Research 160-162 (November 2010): 906–9. http://dx.doi.org/10.4028/www.scientific.net/amr.160-162.906.

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Aggregate obtained by breaking wasted concrete is called recycled aggregate. Recycled aggregate concrete (RAC) is a kind of practical and economic material to reuse the great amount of construction and demolition wastes, which has received many discussions nowadays.Its fatigue behavior is different from other concretes as a result of different property of the aggregate of recycled concrete and other concrete. In order to apply RAC more effectively, it is necessary to study its properties especially for those aggregates from earthquake-stricken area for post-earthquake reconstruction. Therefore, on the basis of experimental research, the fatigue behaviors and microstructure of recycled concrete are studied in this paper. The present paper deals with investigations on fatigue behavior of the axial and eccentric compression performance of recycled aggregate reinforcement concrete specimens which are made from different recycled aggregate proportion such as 0%、50%、100%. Then micro-structural observations of the specimens by means of scanning electron microscopy (SEM) were obtained. Based on the analysis of experiment results, it can be proved that it is feasible to apply recycled concrete to practical engineering.
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Yan, H. Q., and Qing Yuan Wang. "Post-Earthquake Experimental Research and Microscopic Analysis on Fatigue Behavior of Recycled Aggregate Reinforcement Concrete." Applied Mechanics and Materials 52-54 (March 2011): 1551–55. http://dx.doi.org/10.4028/www.scientific.net/amm.52-54.1551.

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In consistent with sustaining development, recycled aggregate concrete (RAC)that is made from recycled concrete aggregates could be a perfect solution to resource and environment preservation. It is a kind of practical and economic material to reuse the great amount of construction and demolition wastes, which has received many discussions nowadays. But, its fatigue behavior is different from other concretes as a result of different property of the aggregate of recycled concrete and other concrete. In order to apply RAC more effectively, it is necessary to study its properties especially for those aggregates from earthquake-stricken area for post-earthquake reconstruction. Therefore, on the basis of experimental research, the fatigue behaviors and microstructure of recycled concrete are studied in this paper. The present paper deals with investigations on fatigue behavior of the axial and eccentric compression performance of recycled aggregate reinforcement concrete specimens with contain recycled aggregate proportion of 0%、50%、100%. Then micro-structural observations of the specimens by means of scanning electron microscopy (SEM) were obtained. Based on the analysis of experiment results, it can be proved that it is feasible to apply recycled concrete to practical engineering.
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Yan, Hui Qun, Qing Yuan Wang, and Ning Yan. "Experimental Research on Fatigue Behavior of Recycled Aggregate Reinforcement Concrete Made from Building Scrap." Advanced Materials Research 339 (September 2011): 448–51. http://dx.doi.org/10.4028/www.scientific.net/amr.339.448.

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In consistent with sustaining development, circularly utilizing the scrap concrete was an important measure for country and human beings. With the development and extensive application of Recycled aggregate concrete (RAC), it, as a structure, certainly would be attacked by unfavorable environments and occurred destroy or invalidation, such as fatigue (vibration load of vehicle or equipment). But, its fatigue behavior is different from other concretes as a result of different property of the aggregate of recycled concrete and other concrete. In order to apply RAC more effectively, it is necessary to study its properties especially for those aggregates from earthquake-stricken area for post-earthquake reconstruction. Therefore, on the basis of experimental research, the fatigue behaviors and microstructure of recycled concrete are studied in this paper. The present paper deals with investigations on fatigue behavior of the axial and eccentric compression performance of recycled aggregate reinforcement concrete specimens with contain recycled aggregate proportion of 0%、50%、100%, when specimens were effected by constant amplitude sine wave fatigue load imposed from 110kN~190KN with 5Hz frequency. Then the expansion and diversification of RAC cracks were real time was watched. Based on the analysis of experiment results, it can be proved that it’s feasible to apply RAC to practical engineering.
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Xiao, Jian Zhuang, and Chuan Zeng Zhang. "Fire Damage and Residual Strengths of Recycled Aggregate Concrete." Key Engineering Materials 348-349 (September 2007): 937–40. http://dx.doi.org/10.4028/www.scientific.net/kem.348-349.937.

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In this paper, recycled aggregate concrete subjected to severe fire or high temperature loading condition is investigated. Special attention of the study is devoted to analyze the fire-induced damage and the residual strengths of recycled aggregate concrete. For this purpose, 160 cube specimens are heated under a single thermal cycle of 20oC (ambient temperature), 200oC, 300oC, 400oC, 500oC, 600o, 700oC and 800oC, respectively. Different replacement percentages of the recycled coarse aggregates (RCA) with 0, 30%, 50%, 70% and 100% are considered. Damage and failure patterns of the recycled aggregate concrete specimens are analyzed systematically based on experimental observations. The residual compressive strengths of the recycled aggregate concrete (RAC) at elevated temperatures are studied and evaluated in details. Some differences between the recycled aggregate concretes with different replacement percentages of the recycled coarse aggregates are observed. On the basis of the experimentally measured residual compressive strengths of the recycled concrete, relationships between the residual compressive strengths of the recycled aggregate concrete and the elevated temperature are derived. The results presented in this paper have direct applications in the design and structural analysis of reinforced concrete structures consisting of recycled aggregate concrete.
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Dissertations / Theses on the topic "Recycled Aggregate Concrete (RAC)"

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Di, Niro Gaetano. "Recycled aggregate concrete (RAC) for structural purposes." Thesis, University of Strathclyde, 1999. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=21124.

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The possibility of using demolished concrete waste as aggregate in fresh concrete in the production of prestressed concrete beams is checked in this research. As opposed to the use for road foundations or as fill-in material the use of the Recycled Aggregate (RA) for concrete structures requires more tests and processing of results. In fact to be able to use a material for construction it is essential to assess more than just its compressive strength. After the physical and chemical characteristics of the RA and the properties of both the wet and hardened Recycled Aggregate Concrete (RAC) have been determined, it is important to check if the mathematical models and numerical correlation normally used for design of ordinary concrete (such as mix-design procedure, design codes, non-linear analysis) are suitable for RAC. For this reason the main task of this investigations has been to ensure that RAC has satisfactory mechanical performance for structural use and later to guarantee a consistency of the results using methods checked for RAC. A mix-design procedure suitable for RAC to attain the desired workability and the target strength was the first step. Tests on durability of RA and RAC have been performed and the results reported. Finally three 15.0 metres span prestressd beams cast with different percentages of RA (one with 100% of RA, one with 100% of Natural Aggregate NA, and one with 50% of RA and 50% of NA) have been tested. The results show that it is practicable to make prestressed concrete elements using concrete made with Recycled Aggregate and that these elements can have satisfactory and predictable mechanical performance.
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Vu, Quoc Hung. "Modelling pollutants leaching from recycled construction materials." Thesis, Queensland University of Technology, 2019. https://eprints.qut.edu.au/130795/1/Quoc%20Hung_Vu_Thesis.pdf.

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This research developed new models to replicate metal leaching characteristics from recycled concrete aggregate (RCA) and reclaimed asphalt pavement (RAP). Model development was supported by a comprehensive experimental and analytical program with multiple influential factors. New models were developed so that they are readily applicable in commercial models to replicate pollutant leaching and solute transport in soil environments. Outcomes of this study will enhance the sustainable use of waste products such as RCA and RAP in the construction industry and relieve the stresses on natural quarry products.
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Krezel, Zbigniew Adam, and n/a. "Recycled aggregate concrete acoustic barrier." Swinburne University of Technology, 2006. http://adt.lib.swin.edu.au./public/adt-VSWT20060821.154340.

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This document reports on a research project aimed at developing a concrete acoustic barrier made from Recycled Aggregate (RA) Concrete. The research project was undertaken in response to the needs expressed by the Victorian concrete recycling industry. The industry, the scientific community conducting research into relevant disciplines, and the community at large, represented by Victorian government agencies, are of the opinion that there is a need to devise a higher value utilisation application for selected concrete recycling products. This document outlines the rationale and objectives of the research project which involves the examination of Recycled Concrete (RC) Aggregate, the design and examination of RA Concrete, and finally the development of an acoustic barrier made from RA Concrete. The literature review presented in this report examines aspects of concrete recycling and concrete technology pertaining to traditional and alternative constituent materials for concrete production. Firstly, the importance and influence of fine and coarse aggregate on basic properties of concrete is introduced. Secondly, an account on the use of alternative materials in concrete technology, especially of coarse recycled aggregates and supplementary cementitious materials (SCM) is described. Thirdly, some of the physical and mechanical properties and how the use of RC Aggregate and SCM changes these properties are discussed. Fourthly, a number of commonly used techniques and neutron scattering techniques to investigate aggregate and concrete properties are introduced and discussed. Fifthly, the porosity of aggregate and concrete including durability are specifically discussed and testing methods are reasoned. The literature review also discusses the use of no-fines concrete; its physical, mechanical and acoustic properties. Finally it presents an account of the use of concrete in transportation traffic noise attenuation devices. This document continues with an outline of a methodology that was adopted in this research project. It outlines experimental work aimed at examining the properties of RC Aggregate which amongst other properties includes porosity, particle size distribution, water absorption, shape and density. It continues examining RA Concrete properties and includes, among other properties, compressive strength, porosity and durability as well as sound absorption of acoustic barrier. The methodology introduces standard and purposely modified test procedures used in the examination of aggregates, concrete and acoustic barrier. An account of various research techniques is presented, spanning from simple visual observations to more sophisticated neutron scattering techniques. The summary of test procedures follows a description of test specimen composition and their sizes, and a suite of tested specimens. It also introduces statistical methods used to analyse test results. After a detailed description of the aggregate, concrete and RA Concrete acoustic barrier, the document outlines a summary of data generated through the experimental program of this research project. The data on fine aggregate, on selected 14/10mm coarse RC Aggregate, on concrete made from natural and recycled aggregate and on acoustic barrier are presented and discussed. Test results of various physical, mechanical and acoustic properties of aggregate, concrete and barrier are reported, analysed and discussed. The data from observations, visual assessment and scientific experimentation of specific properties are then crossed analysed in a search for relationships between properties of fine and coarse aggregates and properties of concrete made from such aggregates. A cross analysis of data on ?less-fines? RA Concrete and on the acoustic performance of barrier is examined, and the relationship between the volume of interconnected voids in a porous part of ?less-fines? concrete, and the sound absorption of acoustic barrier is discussed and reported. The document then presents a synthesis of the literature review results, project aims adopted within the experimental program and test results in the three main areas of this research project. These areas include recycled concrete aggregate, recycled aggregate concrete and acoustic barrier made from RA Concrete. Finally, conclusions reached through the course of this investigation are summarised and recommendations are proposed in relation to the RA Concrete acoustic barrier. The main conclusion is that selected RC Aggregate can be used in the production of concrete of a compressive strength of 25MPa, if the moisture content and water absorption in the aggregate are closely monitored, and the foreign material content is kept below 1.5%. The author concludes that acoustic barrier made from selected RC Aggregate has unique sound absorption characteristics that can easily be tunable by a selection of appropriate aggregate and by specific concrete mix designs. Recommendations for further research are also proposed.
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Krezel, Zbigniew Adam. "Recycled aggregate concrete acoustic barrier." Australasian Digital Theses Program, 2006. http://adt.lib.swin.edu.au/public/adt-VSWT20060821.154340.

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Thesis (PhD) - Swinburne University of Technology, 2006.
Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Civil Engineering, Swinburne University of Technology - 2006. Typescript. Includes bibliographical references.
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Abukersh, Salem Ahmed. "High quality recycled aggregate concrete." Thesis, Edinburgh Napier University, 2009. http://researchrepository.napier.ac.uk/Output/2963.

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Sustainable development is gaining popularity around the globe nowadays. Governments are under pressure, on many fronts, to embed sustainable development in policies, practice, and operations to secure the planet's future. Adding to this, increased populations, and the need for more infrastructures, have unfortunately led to the unacceptable depletion of raw materials, increasing amounts of construction and demolition waste (C&DW) and accelerated deterioration of the natural environment in many places worldwide. For the conservation of natural resources, reuse and recycling of C&DW is the most obvious way to achieve sustainability in the construction sector. Currently, recycled aggregate (RA) is produced from C&DW in modern recycling facilities, under good quality control provisions which could lead to improve its performance compared with the earlier days of recycling. In addition to C&DW, large amounts of industrial and mining by-products such as fly ash, slag, limestone powders, aggregate dust, etc. are dumped in landfills. Fly ash has been used successfully in concrete for a long time due to its numerous advantages across a wide range of properties, including aspects of durability. A concrete produced with the combination of PFA and RA i.e. recycled aggregate concrete (RAC) is obviously more sustainable and economical than conventional natural aggregate concrete (NAC). To date, statistics show that a considerable proportion of the world's RA is used for low-utility applications due to perceived risks and uncertainty over their performance formed as a result of previous history of use when RA was produced manually and low strength cement and higher water to cement ratios were used. Despite the advances in recycling, materials and concreting technologies, this impression prevails. However, to increase the use of RA, it is believed that the quality of RAC should be improved by chemical and mineral additives. For cost effectiveness, quality-improving additives should be abundant, safe, and inexpensive; PFA and new generation polymer-based superplasticizer (SP) are deemed to be a good option. The aims of this study are to investigate the possibility of producing good quality RAC that could be used as a substitute for NAC in normal strength concrete members, and to study its fundamental properties. An attempt has been made to create superplasticized RAC concretes, in which new generation polymer-based SP and PFA produced to the latest European standards were used. PFA was used to partially replace fine aggregate and cement in ordinary and self-compacting concretes. The thesis also includes an investigation into the potential of utilising an aggregate by-product (red granite dust (RGD) in producing environmentally beneficial RAC. The findings show that good performance RAC can be produced with the help of SP and PFA. The study also revealed that it is possible to utilise RGD to substitute up to 30% of cement without substantially influencing the performance of concrete, while also providing cost savings. Strengths and stifnesses of the ensuing RAC either with SP, PFA, or RGD were comparable, or better than, a wide range of counterpart NACs. The author's produced RAC concretes can replace NAC concrete used unnecessarily for many applications including structural concrete.
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Lannon, Kristyna Tylova. "Using recycled concrete aggregate in pervious concrete." [Gainesville, Fla.] : University of Florida, 2009. http://purl.fcla.edu/fcla/etd/UFE0025119.

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Bekoe, Patrick Amoah. "Concrete containing recycled concrete aggregate for use in concrete pavement." [Gainesville, Fla.] : University of Florida, 2009. http://purl.fcla.edu/fcla/etd/UFE0025075.

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Vašek, Tomáš. "Testování možností využívání druhotných surovin jako náhrady přírodních kameniv." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2014. http://www.nusl.cz/ntk/nusl-226736.

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Master's thesis consists of two parts, theoretical and practical. In the theoretical section are listed basic information about alternative aggregates used for concrete mixture, like polystyrene, cinder and recycled concrete. Further, the influence of these alternative aggregates, used as secondary raw materials, on the behaviour and properties of fresh respectively hardened concrete. Possibilities of application concrete containing secondary raw materials are mentioned. In the practical part are experimentally verified physical and mechanical properties of concrete containing crushed waste polystyrene beads, furthermore thermal insulation properties and resistance to elevated temperatures is tested. Influence of heating plant cinder powder as active addition to concrete mixture was tested. As a next is prepared concrete with replacement of coarse aggregate by cinder and recycled concrete and tested. The influence of these secondary raw materials on workability, compressive strength, frost resistance and water permeability of concrete is also defined. The last part of research is focused on recycled concrete such as main material used in mixture of aggregates bonded with cement, dispose for base layers in roads. In conclusion are discussed results from experimental research and summary of knowledge’s about using polystyrene, cinder and recycled concrete as aggregates for concrete mixtures.
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Campbell, Andrew S. "Recycled Aggregate & Robotic Contour Crafting." University of Cincinnati / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1554119761226049.

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Movassaghi, Ramtin. "Durability of Reinforced Concrete Incorporating Recycled Concrete as Aggregate(RCA)." Thesis, University of Waterloo, 2006. http://hdl.handle.net/10012/2884.

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Abstract,
The interest in using recycled construction materials is derived from the growth in construction and demolition waste due to rehabilitation and natural and technological disasters. The driving force for recycling concrete is three-fold: preserving natural resources, utilizing the growing waste and saving energy and money. While some waste concrete is currently being crushed and used for grading and base material for highways, it has not been used as the aggregate in new concrete in Canada, largely because of the plentiful supply of good quality virgin material. However, crushed concrete is being used in new concrete in other parts of the world where the local aggregate is inferior, and there is now a push within the Canadian cement and concrete sector to improve the industry sustainability, one aspect of which is recycling of materials.

The research done to date has emphasized the influence of recycled concrete aggregate (RCA) on the workability and strength of the new concrete with little attention being paid to the behaviour in service. In contrast, the present study is focused on the durability of concrete containing RCA in reinforced structures. Since the most common cause of failure of reinforced concrete structures in this part of the world is corrosion of the reinforcement by de-icing salts, the focus of the project is on this aspect of durability. The project involves a comparative study of the durability of three concrete mixtures containing, as coarse aggregate:
  1. new clean recycled concrete aggregate (NC-RCA) obtained by crushing the excess concrete returned to the ready mix yard;
  2. old de-icing salt contaminated, recycled concrete aggregate ( OC-RCA) from a demolished bridge over Highway 401 in Ontario;
  3. natural aggregate as a control material.
These three materials were crushed and sieved to give the same grading for each mix. Natural sand was used as fine aggregate. The mixes were adjusted to account for the different water absorption characteristics of the aggregates but were otherwise identical. Prism specimens with a centrally placed reinforcing bar, cylindrical specimens and non-reinforced slabs were cast from each of the concretes. After curing, the reinforced prisms were exposed to a saturated de-icing salt solution for two of every four weeks. For the second two week period, they were allowed to dry in the laboratory atmosphere or, to accelerate the process, dried at 32°C in a low humidity (18%) chamber.

The electrochemical corrosion behaviour of the steel was monitored using linear polarization resistance and cyclic polarization techniques. In addition, the physical properties of the materials were assessed. For the aggregates, water absorption, chloride content and susceptibility to abrasion were determined. For the concretes, compressive strength, salt scaling resistance and chloride permeability were measured and microscopic observation of the interfacial zones between the aggregate and the new cement paste were conducted.

On the basis of the results, it is concluded that the durability and the strength of the RCA concrete is very dependent on the age of the RCA aggregate. Water and chloride permeability, and, salt scaling and reinforcing steel corrosion resistance of concrete made with a very well hardened old RCA were comparable with or better than those of in normal concrete. Concrete incorporating new RCA exhibited inferior properties and consequently, it is recommended that, the OC-RCA concrete can be used as a sustainable material in structural applications.
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Books on the topic "Recycled Aggregate Concrete (RAC)"

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Xiao, Jianzhuang. Recycled Aggregate Concrete Structures. Berlin, Heidelberg: Springer Berlin Heidelberg, 2018. http://dx.doi.org/10.1007/978-3-662-53987-3.

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de Brito, Jorge, and Nabajyoti Saikia. Recycled Aggregate in Concrete. London: Springer London, 2013. http://dx.doi.org/10.1007/978-1-4471-4540-0.

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Stark, D. The use of recycled-concrete aggregate from concrete exhibiting alkali-silica reactivity. Skokie, Ill: Portland Cement Association, 1996.

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Rao, M. Chakradhara, Sriman Kumar Bhattacharyya, and Sudhirkumar V. Barai. Systematic Approach of Characterisation and Behaviour of Recycled Aggregate Concrete. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-10-6686-3.

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Brito, Jorge de. Recycled Aggregate in Concrete: Use of Industrial, Construction and Demolition Waste. London: Springer London, 2013.

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Pepe, Marco. A Conceptual Model for Designing Recycled Aggregate Concrete for Structural Applications. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-26473-8.

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Stroup-Gardiner, Mary, and Tanya Wattenberg-Komas. Recycled Materials and Byproducts in Highway Applicationsâ€"Reclaimed Asphalt Pavement, Recycled Concrete Aggregate, and Construction Demolition Waste, Volume 6. Washington, D.C.: Transportation Research Board, 2013. http://dx.doi.org/10.17226/22547.

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Ltd, Thurber Engineering, and Alberta Alberta Environment, eds. Recycled aggregate study city of Edmonton: Report to Construction, Renovation and Demolition (CRD) Waste Reduction Advisory Committee & Alberta Environment. Edmonton: Thurber Engineering Ltd., 2003.

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9

K, Dhir Ravindra, Henderson Neil A, Limbachiya Mukesh C, and University of Dundee. Concrete Technology Unit., eds. Sustainable construction: Use of recycled concrete aggregate : proceedings of the international symposium organised by the Concrete Technology Unit, University of Dundee and held at the Department of Trade and Industry Conference Centre, London, UK on 11-12 November 1998. London: Thomas Telford, 1998.

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Xiao, Jianzhuang. Recycled Aggregate Concrete Structures. Springer, 2018.

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Book chapters on the topic "Recycled Aggregate Concrete (RAC)"

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Rao, M. Chakradhara, Sriman Kumar Bhattacharyya, and Sudhirkumar V. Barai. "Structural Behavior of RAC." In Systematic Approach of Characterisation and Behaviour of Recycled Aggregate Concrete, 249–75. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-6686-3_7.

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Pepe, Marco. "Mix Design Formulation for RAC." In A Conceptual Model for Designing Recycled Aggregate Concrete for Structural Applications, 157–67. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-26473-8_8.

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Pepe, Marco. "Predicting the Mechanical Properties of RAC." In A Conceptual Model for Designing Recycled Aggregate Concrete for Structural Applications, 121–55. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-26473-8_7.

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Sun, Xiaowei, Hongguang Bian, Zhaoyang Ding, and Lin Qi. "Influence of Oxide Molar Ratio on Size Effect of Geopolymer Recycled Aggregate Concrete." In Lecture Notes in Civil Engineering, 516–24. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-1260-3_47.

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AbstractFour different size of concrete cube (70 mm3, 100 mm3, 150 mm3, and 200 mm3) of geopolymer recycled aggregate concrete (GRAC) were prepared by replacing cement with geopolymer and natural aggregate with wast concrete. The effect of oxide molar ratio of raw material on compressive strength and its size effect of GRAC was studied.The results show the size conversion coefficient of GRAC cannot adopt the values from the current national standard GB/T50081. The relationship of size conversion coefficient α and oxide molar ratio ε of GRAC was worked out. It was found that the compressive strength of GRAC of all sizes were in line with the Bazant’s size theory. Oxide molar ratio on critical size and critical value of GRAC were calculated.
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Pepe, Marco. "Regulatory Environment and Guidelines for RACs." In A Conceptual Model for Designing Recycled Aggregate Concrete for Structural Applications, 17–25. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-26473-8_3.

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Xiao, Jianzhuang. "Recycled Aggregate Concrete." In Springer Tracts in Civil Engineering, 65–98. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-53987-3_4.

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Xiao, Jianzhuang. "Modeled Recycled Aggregate Concrete." In Springer Tracts in Civil Engineering, 99–142. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-53987-3_5.

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Pepe, Marco. "Recycled Aggregate Concretes." In A Conceptual Model for Designing Recycled Aggregate Concrete for Structural Applications, 55–89. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-26473-8_5.

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de Brito, Jorge, and Nabajyoti Saikia. "Sustainable Development in Concrete Production." In Recycled Aggregate in Concrete, 1–22. London: Springer London, 2012. http://dx.doi.org/10.1007/978-1-4471-4540-0_1.

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de Brito, Jorge, and Nabajyoti Saikia. "Industrial Waste Aggregates." In Recycled Aggregate in Concrete, 23–80. London: Springer London, 2012. http://dx.doi.org/10.1007/978-1-4471-4540-0_2.

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Conference papers on the topic "Recycled Aggregate Concrete (RAC)"

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Faleschini, Flora, Mariano Angelo Zanini, and Lorenzo Hofer. "Reliability analysis of carbonation for recycled aggregate concretes." In IABSE Symposium, Guimarães 2019: Towards a Resilient Built Environment Risk and Asset Management. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2019. http://dx.doi.org/10.2749/guimaraes.2019.1346.

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<p>Durability represents a crucial issue in the evaluation of safety and serviceability for reinforced concrete structures. Carbonation-induced corrosion is a complex process, which involves several phenomena with different nature at the micro-scale level. Many studies have already focused on carbonation-induced corrosion of natural aggregate concrete (NAC), leading to several prediction models to estimate carbonation depth. Less research is devoted instead on recycled aggregate concrete (RAC), about which limited experimental works analyzed carbonation coefficient in accelerated tests. This work presents a reliability-based analysis of carbonation resistance of RACs, applied on experimental carbonation coefficients derived from literature, and on the full probabilistic method prosed in fib Bulletin 34.</p>
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Rosado, Santiag, Lidia Gullón, Leticia Presa, and Jaime Moreno. "Recyclability of Recycled Concrete Products in Cements." In International Conference on Technologies & Business Models for Circular Economy. University of Maribor Press, 2023. http://dx.doi.org/10.18690/um.fkkt.1.2023.4.

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This research addresses the recycling possibilities of a concrete product that contains coarse concrete aggregate as recycled material. The use of this finely milled product is proposed as an active addition to cement that already includes by-products in their composition. The partial substitution of cement by secondary raw materials contributes positively to the reduction of waste dumping and to the reduction of greenhouse gas emissions. However, the substitution rates of secondary raw materials are higher in concrete aggregates (20%) than in cements. The dosage of a concrete includes approximately three times more coarse aggregate than cement. This means that the amount of waste that can be incorporated into recycled concrete is greater if it is done as coarse aggregate than if it is added to cement. The main advantage of the partial substitution of cement lies in the reduction of CO2 derived from the decarbonization process of the cement raw materials.
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Kaishesh, Abbas Jalal, Sadjad Amir Hemzah, and Bahaa Hussain Mohammed. "Experimental Investigation of Double Web Steel Beam Filled with Recycled Aggregate Concrete(RAC)." In 2022 International Symposium on Multidisciplinary Studies and Innovative Technologies (ISMSIT). IEEE, 2022. http://dx.doi.org/10.1109/ismsit56059.2022.9932835.

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Idrus, A. R., M. W. Tjaronge, and A. A. Amiruddin. "Early age physical properties of porous concrete containing recycle aggregate concrete (RAC) and fibrillated polypropylene fiber under compression load." In 1ST INTERNATIONAL CONFERENCE ON TECHNOLOGY, INFORMATICS, AND ENGINEERING. AIP Publishing, 2022. http://dx.doi.org/10.1063/5.0095616.

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Rahman, Sk Syfur, and Mohammad Jamal Khattak. "Investigation on Tensile Properties of Roller Compacted Geopolymer and Portland Cement Concrete Using 100% Recycled Concrete Aggregate (RCA) and Reclaimed Asphalt Pavement (RAP)." In Tran-SET 2021. Reston, VA: American Society of Civil Engineers, 2021. http://dx.doi.org/10.1061/9780784483787.022.

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Pavlů, Tereza, Kristina Fořtová, Diana Mariaková, and Jakub Řepka. "The durability of recycled aggregate concrete containing recycled masonry aggregate." In SPECIAL CONCRETE AND COMPOSITES 2020: 17th International Conference. AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0042839.

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Limbachiya, M. C. "Performance of recycled aggregate concrete." In RILEM International Symposium on Environment-Conscious Materials and Systems for Sustainable Development. RILEM Publications SARL, 2005. http://dx.doi.org/10.1617/2912143640.015.

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"Durability of Recycled Aggregate Concrete." In SP-336: Cracking and Durability in Sustainable Concretes. American Concrete Institute, 2019. http://dx.doi.org/10.14359/51722458.

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"Application of Recycled Concrete for Structural Concrete- Experimental Study on the Quality of Recycled Aggregate and Recycled Aggregate Concrete." In SP-179: Fourth CANMET/ACI/JCI Conference: Advances in Concrete Technology. American Concrete Institute, 1998. http://dx.doi.org/10.14359/6087.

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Khatab, Mahmoud A. T., and Munir Altmami. "Correlation between different properties of recycled aggregate and recycled aggregate concrete." In INTERNATIONAL CONFERENCE ON KEY ENABLING TECHNOLOGIES (KEYTECH 2019). AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5123692.

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Reports on the topic "Recycled Aggregate Concrete (RAC)"

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Lomboy, Gilson, Douglas Cleary, Seth Wagner, Yusef Mehta, Danielle Kennedy, Benjamin Watts, Peter Bly, and Jared Oren. Long-term performance of sustainable pavements using ternary blended concrete with recycled aggregates. Engineer Research and Development Center (U.S.), May 2021. http://dx.doi.org/10.21079/11681/40780.

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Dwindling supplies of natural concrete aggregates, the cost of landfilling construction waste, and interest in sustainable design have increased the demand for recycled concrete aggregates (RCA) in new portland cement concrete mixtures. RCA repurposes waste material to provide useful ingredients for new construction applications. However, RCA can reduce the performance of the concrete. This study investigated the effectiveness of ternary blended binders, mixtures containing portland cement and two different supplementary cementitious materials, at mitigating performance losses of concrete mixtures with RCA materials. Concrete mixtures with different ternary binder combinations were batched with four recycled concrete aggregate materials. For the materials used, the study found that a blend of portland cement, Class C fly ash, and blast furnace slag produced the highest strength of ternary binder. At 50% replacement of virgin aggregates and ternary blended binder, some specimens showed comparable mechanical performance to a control mix of only portland cement as a binder and no RCA substitution. This study demonstrates that even at 50% RCA replacement, using the appropriate ternary binder can create a concrete mixture that performs similarly to a plain portland cement concrete without RCA, with the added benefit of being environmentally beneficial.
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Isgor, O. Cracking Susceptibility of Concrete Made with Recycled Concrete Aggregate. Portland State University Library, December 2013. http://dx.doi.org/10.15760/trec.50.

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Verian, Kho Pin, Nancy Whiting, Jan Olek, Jitendra Jain, and Mark Snyder. Using Recycled Concrete as Aggregate in Concrete Pavements to Reduce Materials Cost. Purdue University, December 2013. http://dx.doi.org/10.5703/1288284315220.

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Cosper, Stephen D. LBP Concerns in Producing Recycled Concrete Aggregate from Former Fort Ord Family Housing. Fort Belvoir, VA: Defense Technical Information Center, January 2007. http://dx.doi.org/10.21236/ada473800.

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Wang, Kejin, James A. Gaunt, and Jiong Hu. Sequestering Lead in Paint by Utilizing Deconstructed Masonry Materials as Recycled Aggregate in Concrete. Revision 1. Fort Belvoir, VA: Defense Technical Information Center, May 2008. http://dx.doi.org/10.21236/ada495766.

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Li, Xiaojun, Dingxin Cheng, Kun Zhang, Kanwar M. S. Jakhar, and Uday V. Pericherla. Development of a Quality Control Method and Guidelines for Hot Mix Asphalt Using Recycled Concrete Aggregate. Mineta Transportation Institute, March 2020. http://dx.doi.org/10.31979/mti.2020.1854.

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