Journal articles: 'Concrete technology'

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De La Cruz Vega, Sleyther Arturo, Cristian Milton Mendoza Flores, Pablo Adrian Pezo Morales, Jose Antonio Garrido Oyola, Kevin Arturo Ascoy Flores, and Robert Edinson Suclupe Sandoval. "Concrete technology. Chapter 2: Concrete Materials." Universidad Ciencia y Tecnología 26, no. 112 (March 9, 2022): 125–43. http://dx.doi.org/10.47460/uct.v26i112.552.

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The following book chapter presents the essential components of concrete, being a material that can acquire any shape in the liquid state and is very resistant in the hardened state as well as being aesthetic to be used in a diversity of applications. References [1]A. Garófalo, “Evaluación físico-química de los cementos a partir de la correlación de sus propiedades asociadas con la producción de hormigón”, escuela superior politécnica del Litoral, Ecuador, 2015. [2]AFCP, “La industria del cemento y la sostenibilidad”, Argentina, 2014. [3]ASTM, “Especificación normalizada para cemento Portland C 150-07”, Estados unidos, 2007. [4]E. Riva, “Materiales para el concreto”, Ed. ICG, 3era edición, Lima, 2000. [5]Indecopi, “Norma Técnica Peruana NTP 334.001”, Lima, Perú ,2001. [6]P. Aching and W. Del Castillo, “Influencia del plastificante reductor de agua sika-cem en el concreto cemento arena-Iquitos, 2018”, tesis, Universidad científica del Perú, Loreto, Peru, 2018. [7]P. Valera, “Influencia de las propiedades físico –químicas del agua del río Shilcayo en la resistencia del concreto f´c= 210 kg/cm2, Tarapoto-2018”, tesis, Universidad Cesar Vallejo, Tarapoto, Perú. [8]R. Salamanca, “Aplicación del cemento portland y los cementos adicionados”, ciencia e ingeniería Neogranadina, no. 10, pp. 33-38, 2001. [9]S. Laura, “Diseño de mezclas de concreto”, Universidad Nacional del Altiplano, Puno, Perú, 2006.

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Leczovics, Péter, and Viktória Sugár. "CONCRETE CANOE: A COMPLEX CONCRETE TECHNOLOGY." YBL Journal of Built Environment 1, no. 2 (December 1, 2013): 43–55. http://dx.doi.org/10.2478/jbe-2013-0011.

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Abstract The Concrete Canoe Competition has been organized second time in Hungary in 2013. The main point of the competition is to design and create a floating concrete object with specified dimensions, which does not contain statically rigid frame. A speed-trial is also part of the contest. The team of Szent István University, Ybl Miklós Faculty of Architecture and Civil Engineering attended both the first (2012) and the second (2013) competition. In both years the main part of designing and creation of the canoe was under the direction of employees of Building Materials division of the Insitute. Building a concrete canoe proved to be a complex challenge. Knowledge of different engineering fields was required to solve the task - questions about material properties, hydrodynamics, statics, technologies were needed to be solved. Present paper introduces the authors’ experience, investigations, and means of realization of the concrete canoe.

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Pshinko, O. M., T. M. Pavlenko, T. M. Dekhta, O. V. Hromova, and O. V. Steinbrech. "Improvement of concrete and building mortar technology using secondary mineral resources." Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, no. 2 (April 30, 2022): 91–95. http://dx.doi.org/10.33271/nvngu/2022-2/091.

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Purpose. Improving the technology of concretes on the basis of secondary mineral resources (waste foundry sand of metallurgical and machine-building industry, ash-and-slag mixes of thermal power plants). Methodology. Generally accepted standard methods in the study of the basic properties of raw materials, concrete mixes and concretes are used in the work. The samples were moulded using specially made laboratory vacuum equipment. Findings. The study results on the main properties of concretes on the basis of secondary mineral resources confirmed the effectiveness of vibrovacuum technology. For example, the strength of ash-and-slag vacuum concrete is on average higher than the strength of vibrocompacted concrete from a mobile concrete mix by 610 MPa or by 60100% (depending on the cement consumption). Also, high-quality concretes with moderate cement consumption for various types of construction are obtained on the basis of waste foundry sand. Originality. Scientific and technical bases of the technology of vibrovacuum concrete on the basis of waste foundry sand and ash-and-slag mixes were developed. Practical value. Through the development of the technology of vibrovacuum products based on secondary mineral resources concrete, high-quality concretes (increased strength, frost resistance, etc.) were obtained for road and other types of construction. This technology allows applying the existing technological equipment without fundamental design changes, carrying out immediate dismantling of moulded products, which significantly reduces the metal consumption of the technology.

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Tukhareli, V. D., T. F. Cherednichenko, and O. Y. Pushkarskaya. "New Unconventional Additives in Concrete Technology for Expansion its Functionality." Solid State Phenomena 265 (September 2017): 231–36. http://dx.doi.org/10.4028/www.scientific.net/ssp.265.231.

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Functional enhancement of concrete, giving it heat-resistant properties becomes possible while adding mill ground additions based on silicon carbide materials of the region. The selection of silicon carbide waste and secondary production materials as a filler for the production of concrete with heat-resistant properties was based on the following principles: dispersion, the chemical composition, phase composition that reflect the chemical activity of the material in relation to the concrete binder. The thermal resistance of concrete has increased fivefold. In forming concrete structures with addition of silicon carbide occurs embedding into the structure of hydrates fine powder silicon carbide cyclone dust, with the chemical processes behaviour in the boundary contact zone between binder and filler. The increase of thermal resistance can attribute the resulting concrete composition to the category of heat-resistant concretes, and that significantly expands the functionality of concrete.

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LARSEN, O. A., V. V. NARUTS, and V. V. VORONIN. "CONCRETE RECYCLING TECHNOLOGY FOR SELF-COMPACTING CONCRETE." Building and reconstruction 88, no. 2 (2020): 61–66. http://dx.doi.org/10.33979/2073-7416-2020-88-2-61-66.

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Zdeb, T. "Ultra-high performance concrete – properties and technology." Bulletin of the Polish Academy of Sciences: Technical Sciences 61, no. 1 (March 1, 2013): 183–93. http://dx.doi.org/10.2478/bpasts-2013-0017.

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Abstract The paper deals with information concerning properties and technology of a new generation cementitious composite i.e. Ultra-High Performance Concrete. High performance here means both high strength and high durability under the influence of environmental factors. This group of composites is mainly represented by Reactive Powder Concretes (RPC), which show both outstanding durability and mechanical properties. Characteristic features of RPC are mainly due to the very low water-cement ratio, which involves application of superplasticizer, significant reduction of aggregate grains size as well as hydrothermal treatment. In the first part of the paper selected properties of RPC are compared to ordinary concrete and to other groups of new generation concrete. Moreover, fundamental technological factors influencing properties of RPC are described as well. The second part deals with the RPC developed at Cracow University of Technology. The presented test results are mainly focused on the influence of steel fibres content on mechanical properties of reactive powder concrete and hydrothermal treatment on composites microstructure. The quantitative and qualitative evaluation of this relationship expand the knowledge of the UHPC technology. Finally, the third part presents the most significant and newest structures which have been erected with the use of RPC

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Sun, Li Gong. "Pump Concrete Construction Technology." Applied Mechanics and Materials 229-231 (November 2012): 2518–21. http://dx.doi.org/10.4028/www.scientific.net/amm.229-231.2518.

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In recent years, pump concrete construction technology is widely put in use because the modern architecture trends to over- height, large- span, and over-load. In the basis of the railway engineering examples, the thesis elaborates the ratio design of high-strength pump concrete, construction technology and quality control with reference to projects of the same kind.

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Clement, Francis Deng, Hong Zhang, and Cong Liu. "Progresses in Concrete Technology." Applied Mechanics and Materials 723 (January 2015): 451–55. http://dx.doi.org/10.4028/www.scientific.net/amm.723.451.

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Investigationofrecentprogressesinconcretetechnology,withemphasisonresearchachievedattheCenterforAdvancedCementBasedMaterials (ACBMCenter) atLiYang, china, as explored during our recent visit is presented.Ultra-high-strengthconcrete (UHSC),withcompressivestrengthof200MPa,devisesbeenindustrialized. Thepropertiesandusesof reactivepowderconcrete,onetypeof UHSC,areargued.Fiberreinforcementisrecycledtoovercometheinherentbrittlenessandincreasethetensilestrengthofconcrete,particularlyhigh-andultra-high-strengthconcrete.Fiber-reinforcedcementitiousaggregatescan bedesignedforparticularuseswiththeuseofdistinctiveprocessingtechniques,suchasextrusion,and hybridfiberreinforcement.Significantdeclinesindryingshrinkageareattainedwithanewlyadvancedshrinkage reducingadmixture.Productioncostscanbereducedwiththepracticeofselfcompressingconcrete (SCC),whichdoesnotrequirevibrationatplacement.Thedesign ofSCCisexpeditedwitharecentlyadvancedrheologicalmodel.Anondestructiveestimationproceduredevisesremaineddevelopedtomonitorthehardeningprocessoffreshconcrete.

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Kashiwagi, M. "Innovation of Concrete Technology." Concrete Journal 52, no. 7 (2014): 563. http://dx.doi.org/10.3151/coj.52.563.

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Freytag, Bernhard. "Glass-Concrete Composite Technology." Structural Engineering International 14, no. 2 (May 2004): 111–17. http://dx.doi.org/10.2749/101686604777963991.

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Lydon, F. D. "Advances in concrete technology." Construction and Building Materials 7, no. 3 (September 1993): 187. http://dx.doi.org/10.1016/0950-0618(93)90062-h.

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topçu, ilker bekir. "Self-Cleaning Concretes: An Overview." Journal of Cement Based Composites 1, no. 2 (September 18, 2020): 6–12. http://dx.doi.org/10.36937/cebacom.2020.002.002.

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Many studies have been carried out on the problems of civil engineering with the change of human problems today and in the past. These studies contributed to the development of concrete technology. Concrete is an important building material consisting of mixing aggregate, cement and water with or without chemical and mineral additives since the first day of use. Concrete technology has made great progress and continues. With developing concrete technology, self-cleaning concretes have emerged. Many studies have been conducted on self-cleaning concretes by researchers. This article reviews the research published on self-cleaning concretes and presents its role in reducing environmental pollution and its place in future engineering studies. When we look at the studies on self-cleaning concretes that emerged as a result of the developments in concrete technology, it is seen that the developments have progressed considerably. Contemporary civil engineering has provided a highly effective solution for the solution of modern problems. Environmentally friendly building materials will fulfil their duty in reducing air pollution, one of the biggest problems of our time. Self-cleaning buildings and roads that reduce pollution may sound like futuristic ideas, but it is not far away to encounter these structures more widely in our country and our world.

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Kumar, Ranjan, and Rajneesh Kumar. "Studies on High Performance Concrete Using Mineral Admixtures." International Journal for Research in Applied Science and Engineering Technology 10, no. 9 (September 30, 2022): 751–55. http://dx.doi.org/10.22214/ijraset.2022.46727.

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Abstract: High performance concrete is made using byproducts called cement replacement materials. Comparatively little information has been published regarding the results of different Effects of mineral admixtures on concrete's microstructural and team performance characteristics under various curing regimes. Additionally, it is unclear how concrete's strength relates to its conductivity and porous structure. Workability of the new concrete as well as engineering characteristics like cube and revised cube compressive strength and flexural strength were among the properties examined. The findings demonstrate that lanaba dry curing makes concretes weaker, more porous, with a increased pore size, and more permeable. It was discovered that tiny amounts of silica fume can make up for the reduction early in life compressive strength caused by the insertion of bagasse ash from sugar cane. With increasing concentrations of sugar cane bagasse ash or slag in the mixtures, the microstructural and engineering characteristics and concrete's capacity to breathe that contain them they seem to be more vulnerable to inadequate than concrete cubes for curing.

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Vorobchuk, Vasily, Maria Matveeva, and Artem Peshkov. "Decorative concrete on white cement: resource provision, technology, properties and cost-effectiveness." MATEC Web of Conferences 212 (2018): 01023. http://dx.doi.org/10.1051/matecconf/201821201023.

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Decorative concrete refers to a special kind of concrete. Products made of decorative concrete must meet, in addition to the increased requirements for appearance, certain architectural expressiveness and also certain indicators for strength, durability, and environmental friendliness. In addition, one should strive to reduce the cost of both decorative concrete and products made of such concrete. The analysis is carried out, experimental researches of qualitative indicators of industrial man-caused wastes are also studied: carbide lime, fluoride, sludge-lignin, their material and chemical composition. The possibility of using the analyzed industrial wastes as raw materials for production of white and color cements is established. The physicomechanical properties of the obtained cements and decorative concretes on their basis are studied, the economic efficiency of the proposed technology is determined.

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Yu, Ran Gang, and Xin Hu Wang. "Admixtures in Concrete Crack Control and Construction Technology Optimization." Advanced Materials Research 163-167 (December 2010): 1115–20. http://dx.doi.org/10.4028/www.scientific.net/amr.163-167.1115.

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This paper studies properties of concrete under the action of water-reducing retarder and expansive agent; gives the optimal design calculation method of cooling water pipe in the construction technology: mainly considering pipe’s diameter, distance, cooling water’s flow, temperature, time etc; studies the optimization to the concretes construction method. Midas/Civil, one finite element analysis soft-ware, analyses mass concrete construction of the whole process of the temperature field and stress field in the numerical simulation, considering the admixtures and construction technology. The results show that commonuse of admixtures and reasonable construction technology are the important means of controlling cracks.

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Farida, Anggun, Iwan Juwana, and Hazairin. "The Treatment of Used Reagent Glass Bottles Using Solidification Technology." MATEC Web of Conferences 147 (2018): 04011. http://dx.doi.org/10.1051/matecconf/201814704011.

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Used reagent glass bottles are solid waste that people rarely pay attention to in Indonesia. In many cases, the bottles are disposed off without proper handling and treatment, due to the lack of research and information. One potential treatment for such waste is to transform the glass bottles into raw materials for concretes. The objective of the research is to determine the influence of crushed glass particles to the quality of the concrete. The potential reduction of glass bottles will also be calculated.The glass bottles used in this research are the amber ones. The concrete was designed to meet the K225 type requirements. Experiments were done using 0%, 25%, 50%, and 75% of crushed glass particles. In the concrete production, these crushed glass particles will replace the coarse aggregates. This research measured compressive strength and Toxicity Characteristic Leaching Procedures (TCLP) tests in accordance to SNI and TCLP Extraction Procedures from BAPEDAL. At the end, it was found that the concretes using all variations meet the requirements. As for the TCLP, it showed that concentrations of Cr6+ for the concretes using all variations were all under the threshold, according to Hazardous National Regulation 101/2014. The potential reduction is 600 – 2100 waste bottles.

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Cheng, Yu Lan. "Mass Concrete Crack Control Technology." Advanced Materials Research 1065-1069 (December 2014): 1990–94. http://dx.doi.org/10.4028/www.scientific.net/amr.1065-1069.1990.

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Combined with engineering examples, describes the reasons for the large volume of concrete cracks proposed comprehensive measures to control cracks from all aspects of mass concrete harmful cracks eliminate achieved remarkable results, for the future of similar mass concrete construction provides some guidance .

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Kaprielov, S. S., A. V. Sheynfeld, Al-Omais Dzhalal, A. S. Zaitsev, and R. A. Amirov. "A technology of erecting high-rise building frame structures using B60-B100 classes high-strength concretes." Bulletin of Science and Research Center of Construction 33, no. 2 (July 10, 2022): 106–21. http://dx.doi.org/10.37538/2224-9494-2022-2(33)-106-121.

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Introduction. The article presents a technology of erecting of high-rise building's frame structures made of B60-B100 classes high-strength concretes. This technology includes a complex of processes and considers a number of special features, the most significant of which are connected with the specific character of high-strength concretes and concreting climatic conditions.Aim. To determine the main requirements for the technology of concreting and parameters of curing the monolithic structures of high-rise buildings made of B60-B100 classes high-strength concretes, including at winter periods, at the various stages of their erection.Methods and materials. Studies were carried out on the effect of hardening temperature variations from +5 to +50 °С on the hardening kinetics of B60, B80, and B100 classes concretes. Based on the 15-year experience of the “Moscow-City” construction, the mix proportions of high-strength concretes were optimized, as well as the main technological parameters of concreting and curing the frame structures located at an altitude of up to 370 m were analyzed and summarized.Results. The mix proportions of B60-B100 classes concretes of high-workability and self-compacting mixtures with a cement consumption of 350–480 kg/m3 was optimized using standard materials and MB-type organomineral modifiers. The performed study revealed a regularity between the strength and the temperature-temporal parameter of concrete curing, which is applicable for a preliminary assessment of strength characteristics in high-strength concrete structures on the basis of their temperature measurement results. A systematic approach to concrete curing and the maintenance of building structures as a whole with the vertical division of a high-rise building into four temperature zones led to a reducing the probability of thermal cracks appearance.Conclusions. According to the results of the study, the proposed complex of technological solutions concerning compositions and properties of concrete mixtures and concretes, the technology of concreting, as well as the methods of heating and curing the concrete of structures at the various stages of their erection ensures thermal resistance to cracks at the early stage of concrete hardening, as well as the high quality and assigned rates of construction.

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Urano, S., Y. Nakata, S. Yanai, and C. Hashimoto. "Concrete Pumping Safety and Latest Concrete Pumping Technology Developments." Concrete Journal 58, no. 3 (2020): 209–16. http://dx.doi.org/10.3151/coj.58.3_209.

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Gharehbaghi, Koorosh. "Advancements in Concrete Technology in Australia: Geo-Polymer Concrete." International Journal of the Constructed Environment 7, no. 1 (2015): 19–29. http://dx.doi.org/10.18848/2154-8587/cgp/v07i01/37460.

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Schepochkina, Yu A., A. A. Orekhovskaya, V. A. Sokolova, V. N. Malikov, S. G. Lopareva, D. V. Loparev, and D. N. Klyosov. "Polymer materials in concrete technology." IOP Conference Series: Earth and Environmental Science 981, no. 4 (February 1, 2022): 042045. http://dx.doi.org/10.1088/1755-1315/981/4/042045.

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Abstract Possible directions of rational use of polymer materials in cement concrete technology are proposed. Introduction of crushed plastics into the concrete mixture in an amount of 0.5-2 wt. % helps to increase the strength of concrete during bending and compression. As a water-retaining polymer additive for cement composites, it is proposed to use sodium polyacrylate, and such an additive should be pre-prepared by holding the granules in water until swelling, followed by grinding. The use of styrene, acrylonitrile, and methyl methacrylate monomers as impregnating materials for concrete is considered. Monomers must be applied to the concrete surface together with 2% of the initiating system “benzoyl – dimethylaniline peroxide” (1:0.5). Benzoyl peroxide in this system acts as an initiator, and dimethylaniline is an accelerator for the decay of the initiator into free radicals. The specified maintenance of the initiating system ensures the completeness of the transformation and high strength of the polymer.

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Kiyomiya, Osamu. "Recent Measurement Technology on Concrete." Concrete Journal 29, no. 5 (1991): 5–14. http://dx.doi.org/10.3151/coj1975.29.5_5.

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Lee, SH, GD Kim, GY Kim, and MS Son. "Application Technology of Black Concrete." Concrete Journal 42, no. 6 (2004): 18–23. http://dx.doi.org/10.3151/coj1975.42.6_18.

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Zhabin, Dmitryi V., Viktor N. Sokov, and Dmitryi Y. Zemlyanushnov. "Foam Concrete through Electric Technology." Advanced Materials Research 860-863 (December 2013): 1189–92. http://dx.doi.org/10.4028/www.scientific.net/amr.860-863.1189.

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The article considers possible production of foam concrete through an intensive method of processing the foam mass providing for the completion of physical, chemical and structural formation processes. The physical aspects of temperature gradients arising in the foam mass under the effect of combined hydraulic-and-heating field of forces are shown.

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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.

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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.

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Sawamoto, T., and M. Tsuji. "Concrete Technology Course for Children." Concrete Journal 47, no. 5 (2009): 136–39. http://dx.doi.org/10.3151/coj.47.5_136.

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Kawada, T. "My Relationship with Concrete Technology." Concrete Journal 48, no. 2 (2010): 31. http://dx.doi.org/10.3151/coj.48.2_31.

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Miyauchi, H. "Concrete Bridge Technology on Expressway." Concrete Journal 51, no. 1 (2013): 108–11. http://dx.doi.org/10.3151/coj.51.108.

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Miyagawa, T. "Concrete Technology and Civil Engineer." Concrete Journal 52, no. 9 (2014): 726–28. http://dx.doi.org/10.3151/coj.52.726.

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Fujita, N. "Glass and Concrete Technology Fusion." Concrete Journal 53, no. 8 (2015): 728. http://dx.doi.org/10.3151/coj.53.728.

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Efimov, Boris, Sergey Isachenko, Mukhamad-Basir Kodzoev, Gulzar Dosanova, and Ekaterina Bobrova. "Dispersed reinforcement in concrete technology." E3S Web of Conferences 110 (2019): 01032. http://dx.doi.org/10.1051/e3sconf/201911001032.

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The methods of disperse reinforcement of a concrete matrix with the help of fibers make it possible to manufacture structures of complex configuration and solve problems of frost resistance of products. Fiber replaces secondary reinforcement, reducing the volume of use of structural steel reinforcement. Cellular fibrous concrete is characterized by high performance properties, especially increased strength in bending and stretching, impact strength and crack resistance. As a reinforcing component, it is preferable to use mineral fibers or thin basalt fiber. The use of polyamide fiber is allowed, but there are difficulties in forming adhesive contacts between the fiber and the mineral matrix of cellular concrete. A feature of mineral fibers is that they are high adhesive to the cement matrix. One of the promising types of dispersed bulk reinforcement of lightweight concrete is the use of expanded vermiculite. Expanded vermiculite can simultaneously be considered as a reinforcing component of a lamellar structure, as a component that reduces the density of the material and its thermal conductivity, as well as improves the fire protection performance. Expanded vermiculite can be used both in piece cladding products and as a part of dry warm and fire retardant plaster mixes.*

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Hui, Liu, and Liu Yongbiao. "Fabricating Technology for Concrete Pipes." IERI Procedia 1 (2012): 124–30. http://dx.doi.org/10.1016/j.ieri.2012.06.020.

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Glagolev, Evgeny S. "Effective Application of 3D Additive Technologies for Creation of Construction Compositions Using Technogenic Raw Materials." Materials Science Forum 1017 (January 2021): 51–60. http://dx.doi.org/10.4028/www.scientific.net/msf.1017.51.

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Nowadays the great attention of scientists and engineers is attracted by applying 3D-additive technologies for obtaining high-strength fine-grain concrete by using technogenic raw materials. It is distinguished from the conventional concrete by the increased content of cement stone, lower grain size, multicomponent composition and the increased specific surface of the aggregate [1-3]. The performance characteristics of such concrete mostly depend on its aggregate’s properties and water content.The paper considers the problem of improving fine-grain concretes production technologies. For this purpose the opportunities of 3D-additive technologies, which improve the efficiency of fine-grain concretes production technology due to using concrete compositions with natural and technogenic raw materials of various chemical and mineral formulas, were studied. The opportunity of increasing the economic feasibility of high-strength fine-grain concretes, produced by means of 3D-additive technology, with preserving their performance characteristics, has been demonstrated

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Glagolev, Evgeny S. "Effective Application of 3D Additive Technologies for Creation of Construction Compositions Using Technogenic Raw Materials." Materials Science Forum 1017 (January 2021): 51–60. http://dx.doi.org/10.4028/www.scientific.net/msf.1017.51.

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Nowadays the great attention of scientists and engineers is attracted by applying 3D-additive technologies for obtaining high-strength fine-grain concrete by using technogenic raw materials. It is distinguished from the conventional concrete by the increased content of cement stone, lower grain size, multicomponent composition and the increased specific surface of the aggregate [1-3]. The performance characteristics of such concrete mostly depend on its aggregate’s properties and water content.The paper considers the problem of improving fine-grain concretes production technologies. For this purpose the opportunities of 3D-additive technologies, which improve the efficiency of fine-grain concretes production technology due to using concrete compositions with natural and technogenic raw materials of various chemical and mineral formulas, were studied. The opportunity of increasing the economic feasibility of high-strength fine-grain concretes, produced by means of 3D-additive technology, with preserving their performance characteristics, has been demonstrated

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Yusupova, Alsu A., Aleksandr A. Bobryshev, and A. A. Treschev. "Development of Sulfur and Silicon Dioxide Activation Method in the Sulfur Concrete Technology." Solid State Phenomena 284 (October 2018): 1114–18. http://dx.doi.org/10.4028/www.scientific.net/ssp.284.1114.

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The paper investigates the recovery problem of waste sulfur from metallurgical, oil and gas plants. The method was developed to synthesize inorganic sulfides and sulfur concretes from them using the activating agent – titanium chloride and different silica-containing raw materials. The chemical interaction between sulfur, titanium tetrachloride and silicon dioxide encourages the formation of a strong and compact structure in the material. The physical chemical and quantum chemical calculations confirmed the formation of titanium silicate sulfide and made it possible to suggest the concept of sulfur concrete synthesis. It was found how the amorphous component in the filler influenced the properties of sulfur concrete. The physical mechanical tests were performed on the specimens of sulfur concrete, based on opal crystobalite rock from the different fields. The optimum sulfur concrete formulation was determined. The specimens with the optimum composition have high coefficient of resistance to HCl, H2SO4, CaCl2, NaCl, MgSO4 solutions, high impact resistance, freeze resistance and density to meet GOST concrete standard. The resulting materials can be used for production of some construction materials: paving slabs and blocks, road building materials.

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Turgunbaev, Urinbek, and Movluda Umirova. "High-strength concrete technology for manufacturing reinforced concrete sleepers from prestressed reinforced concrete." E3S Web of Conferences 264 (2021): 02040. http://dx.doi.org/10.1051/e3sconf/202126402040.

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The properties of concrete with complex chemical additives to improve the technology for the production of sleepers from prestressed concrete are discussed in the article. With the use of complex chemical additives under heat-moisture processing, at a temperature of 40°C, there was no decrease in the strength of the cement stone and sufficient strength at the initial stage of the curing period, 44.7 MPa; concrete strength was determined with the addition of Glenium 27 S - 1.0% and the hardening accelerator Master X -Seed 100 - 1.2%. Thus, the use of complex chemical additives makes it possible to solve the problem of achieving the necessary early high strength of concrete to implement low-temperature technology in the production of reinforced concrete sleepers.

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Lee, Donghoon, Won Kee Hong, Jeong Tai Kim, and Sunkuk Kim. "Conceptual Study of Production Technology of Free-Form Concrete Segments." International Journal of Engineering and Technology 7, no. 4 (August 2015): 321–25. http://dx.doi.org/10.7763/ijet.2015.v7.812.

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Huang, Peng Fei. "Patent Analysis of Concrete Testing Technology." Key Engineering Materials 726 (January 2017): 120–24. http://dx.doi.org/10.4028/www.scientific.net/kem.726.120.

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Discover Patent existing concrete performance test technology at home and abroad in the field of analysis of the existing concrete performance test technical features, difficulties and trends, noted that the current domestic patent technology in concrete performance test encountered utilization, protection and disputes, high durability and lightweight concrete and avoid patent risk recommendations for the structure to adapt to the development of the next building needs and provide research and development of high strength.

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Zheng, Wenxiao, Hongyang Chen, and Junjie Zhao. "Summary of CO2 curing concrete technology." Highlights in Science, Engineering and Technology 18 (November 13, 2022): 181–89. http://dx.doi.org/10.54097/hset.v18i.2655.

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In recent years, China has a large amount of infrastructure projects and increasingly serious environmental pollution. The impact of CO2 and other greenhouse gases on the climate is becoming more and more significant. With the proposal of the national "double carbon" goal and green development strategy, exploring a new model of carbon sequestration has become a research hotspot. This paper comprehensively expounds the technology of carbon dioxide curing concrete, and introduces the mechanism of the technology, the influencing factors in the curing process, and the influence of carbon dioxide curing on concrete. It is found that the water binder ratio of concrete, raw materials such as aggregates, and the concentration, pressure, pre-curing and other external conditions of carbon dioxide have different degrees of influence on the curing of concrete; In addition, it is also found that CO2 curing improves the mechanical properties, microstructure and durability of concrete. Finally, the research on CO2 curing concrete technology is summarized and the future development is prospected.

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Rudchenko, Dmitry Gennadievich, and Vasil Romanovich Serdyuk. "MINERAL ADDITIVES IN THE TECHNOLOGY OF AUTOCLAVE CONCRETE CONCRETE PRODUCTION." Collected scientific works of Ukrainian State University of Railway Transport, no. 199 (June 10, 2022): 32–43. http://dx.doi.org/10.18664/1994-7852.199.2022.258670.

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The construction industry is one of the largest consumers of energy and rawmaterials. It is also responsible for excessive greenhouse gas emissions. The share of autoclavedaerated concrete (AAC) in the structure of wall materials in many European countries reaches 50 %and more. Due to low energy consumption of production, high operational and construction-technological properties, relatively low cost, and environmental friendliness, these materials displacetraditional wall materials from the construction market (ceramic and silicate bricks, expanded clayconcrete).The article presents an analysis of modern approaches to reducing the energy consumptionduring AAC production, such as reducing the clinker component in the aerated concrete mixture.Prospects for the use of fly ash, blast furnace granulated slag and other mineral additives that reducecement consumption and improve the performance of AAC are presented.It is shown that the most acceptable technological method of reducing the resource and energysaving technology of AAC production is the transition to the production of low-density material whilemaintaining its physical and mechanical properties.The results of the evaluation of metakaolin additives in the composition of AAC are given.Inexpensive and affordable local effective pozzolanic additives can increase the economic andenvironmental attractiveness of autoclaved aerated concrete. It is established that the addition ofmetakaolin can act as an alternative component in aerated concrete mixtures and replace gypsumadditive.Additives of calcined clay, in particular metakaolin Al2O3 • 2SiO2 is one of the most effectivepozzolanic additives. Laboratory and experimental studies have shown an increase in the physicaland mechanical properties of autoclaved aerated 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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Shao, Xiao Rong, and Liang Feng Zhu. "Application of Polypropylene Fiber Concrete in Underground Engineering." Advanced Materials Research 163-167 (December 2010): 1776–79. http://dx.doi.org/10.4028/www.scientific.net/amr.163-167.1776.

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Aimed to solve the problem that the mass concrete structures are apt to crack in underground engineering, this paper makes some research from the view of crack resistance performance of polypropylene fiber concretes. Since polypropylene fiber achieves waterproof through realizing of crack resistant, blending polypropylene fibers into concretes can reduce early contraction deformation of concretes, hinder emergence of plastic shrinkage cracking and improve impermeability of concretes, and its construction technology is simple. In practical application of this in anti-cracking and anti- seepage concrete structures in the International Terminal project of Hangzhou Xiaoshan International Airport, we find that mix of polypropylene fibers with concretes clearly improves anti-cracking and anti-seepage performance of concrete structures and meets design requirements of basements through measuring temperature and observing cracking condition of the mass concrete structures of basements on site. The project can provide experience for reference to similar projects.

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Zhu, Xiao Bin. "Numerical Simulation of Influence of Aggregate-Mortar Interface on Fracture Toughness of Concrete." Advanced Materials Research 893 (February 2014): 577–84. http://dx.doi.org/10.4028/www.scientific.net/amr.893.577.

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To explore the feasibility of the approach of "interfacial toughening in concrete", the 2D concrete model which possesses the characteristic of random distribution of spherical aggregates was used to simulate the relations between interface material and toughness of concrete containing flexible interfacial material. The influence of interfacial material on the toughness of concrete was calculated with elastic modulus, thickness and the displacement at peak load for variables. And the results show that: The peak width of the concrete's load-displacement curve is increased evidently with the ultimate displacement also improved evidently upon replacing the normal ITZ with flexible interface phase material; the concrete's peak load, the displacement at peak load and the fracture energy increase gradually with the increase of the elastic modulus of interface phase material. When the elastic modulus exceeds 50MPa, the concrete's peak load will exceed that of normal concrete promptly with the displacement at peak load and the fracture energy all reaching the maximal value; With the gradual increase of the thickness of interface phase material, the concrete's peak load declines gradually while the displacement at peak load increases gradually; The concrete's fracture energy and ductility coefficient approximately increase first and then decline with the change of thickness. When the thickness is 0.2mm, the concrete's fracture energy and ductility coefficient reach the optimal value in setting scope. With the gradual increase of the interface phase material's displacement at peak load, the concretes peak load increases gradually while its fracture energy and ductility coefficient increase first and then decline. When the displacement at peak load is 0.05, the two reach the optimal value; when the displacement at peak load exceeds 0.05, the cracks will extend from the aggregates-mortar base debonding to the mortar matrix. The results have certain exploration value for developing concrete toughening technology.

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Nakhaev, M., and M. Salamanova. "MATERIALS AND TECHNOLOGY FOR OBTAINING A RECYCLED NOISE PROTECTION PANEL." Bulletin of Belgorod State Technological University named after. V. G. Shukhov 7, no. 5 (May 11, 2022): 8–16. http://dx.doi.org/10.34031/2071-7318-2022-7-5-8-16.

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There are thousands of kilometers of noise protection screens around the world along roads, railways and near airports. The use of such screens poses some issues. Barriers often lack the required level of sound absorption and have low durability. Screens can be noise-absorbing, noise-reflecting or both. Sound absorbing materials are used to suppress noise at medium and high frequencies. For sound deadening at low frequencies, resonant absorbers are used; they are Helmholtz resonators combined into a single structure. When panels reach the end of their life cycle, they must be recycled. Separating wood, metal, fiberglass or rock wool slabs wrapped in fiberglass is not easy. The production of mineral fiber requires a lot of energy. A selection of materials has been proposed and the properties of fine-grained concretes for the further manufacture of a noise-protective panel have been investigated. The perforated front and blank rear walls are made of fine-grained basalt fiber-reinforced concrete reinforced with alkali-resistant basalt fibers. The results of studies of fine-grained basalt concrete confirmed the effectiveness of the combined use of basalt fibers and superplasticizer Master Glenium 115. The physical and mechanical characteristics of basalt fiber-reinforced concrete are increased by about 70–80 % compared to traditional concrete, which will further increase the durability of imitation noise protection panels.

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Windisch, Andor. "The tensile strength: The most fundamental mechanical characteristics of concrete." Concrete Structures 22 (2021): 1–4. http://dx.doi.org/10.32970/cs.2021.1.1.

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Concrete is an inhomogeneous building material. It has a considerable and reliable compressive strength and a relative low tensile strength which can be even exhausted locally under unfortunate conditions. It is quite obvious that the concrete tensile strength was always reprehended as the most unreliable concrete property. A simple relationship between tensile- and compressive strength is introduced. The mechanical background of the relation tensile- to compressive strength in case of ‘normal’ and high strength concretes is elucidated. Mechanical bond, too, relies completely on the tensile strength. In the design of structural concrete members the tension fields are more characteristic than the compression fields. Effective concrete strengths are not successful. Tensile strength can be applied as ‘yield condition’ for the lower bound solution in the theory of plasticity. The paper intends to contribute to the acceptance of the tensile strength as the more fundamental concrete characteristics.

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Abdukhalimjohnovna, Mirzaakhmedova Ugiloy. "Technology Of Elimination Damage And Deformation In Construction Structures." American Journal of Applied sciences 03, no. 05 (May 31, 2021): 224–28. http://dx.doi.org/10.37547/tajas/volume03issue05-35.

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The study found that the necessary maintenance work should be carried out in the first 7 days after the completion of concreting in reinforced concrete structures, which significantly increases the penetration in concrete, the formation of cracks, decreased strength, load bearing capacity of structures.

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Sugár, Viktória, Márton Takács, and Vilmos Ovári. "Investigation and Application of High Performance Concretes." Materials Science Forum 659 (September 2010): 517–21. http://dx.doi.org/10.4028/www.scientific.net/msf.659.517.

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Recent research work of the authors is dealing with preparing, investigation and application of high performance concretes (HPC) produced by the mean of results of modern concrete technology. These special types of concrete have one or more outstanding properties conversely the normal concrete. This article is focusing on the results of the experiments regarding self compacting concrete (SCC). During the investigation, effects of the fine-graded fraction was studied, which is indispensable component of the SCC. The effects of bulk density, consistency, air content, compressive strenght were analysed on fresh and hardened concrete.

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Xu, Yuan. "Regeneration Aggregate Concretes Enhancement Technology Experimental Study." Applied Mechanics and Materials 193-194 (August 2012): 298–302. http://dx.doi.org/10.4028/www.scientific.net/amm.193-194.298.

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The article analyzed the filling and repairing effect of ultra-fine fly ash about recycled concrete under different gradations. And obtained something by analyzing test data: ultra-fine fly ash could improve the recycled concrete workability and strength to some extent, but different gradations of the recycled concrete have different effects on strengthen. Recycled concrete strength increased by an average of about 15% after incorporation of ultra-fine fly ash. These conclusions could provide a certain reference value for the recycled concrete research and application of enhanced technology.

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Zhao, Jinzhong, Jin Wu, and Kaixin Chen. "Feasibility of Application for the SHG Technology of Longitudinal Wave in Quantitatively Evaluating Carbonated Concrete." Applied Sciences 12, no. 24 (December 18, 2022): 13009. http://dx.doi.org/10.3390/app122413009.

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The ultrasonic transmission detection method is used to investigate the applicability for the second-harmonic generation (SHG) technology of longitudinal wave to quantitatively assess carbonated concrete. The principal of this method is to use the piezoelectric lead zirconate titanate (PZT) patch to detect the second-harmonic of longitudinal waves during the concrete carbonation process and extract non-linear parameters from observed signals. Non-linear parameters of concretes with two water–cement ratios (CI (w/c=0.47), CII (w/c=0.53)), two moisture contents (CI 0%, CI-W 100%), and three ultrasonic incident frequencies (50 kHz, 75 kHz, 100 kHz) were measured in this study. Results of the experiment demonstrate that non-linear ultrasonic parameters of longitudinal ultrasonic waves with high frequencies (75 kHz, 100 kHz) exhibit a better resolution regarding changes in concrete microstructure. Moisture (CI 0%, CI-W 100%) has little effect on the rate (CI: 62.73%, CI-W: 60.25, carbonation depth: 15 mm) for the change in relative non-linear parameters in the same concrete. The carbonation depth of concrete (CI (w/c=0.47), CI-W (w/c=0.47), CII (w/c=0.53)) can be well reflected by the change in relative non-linear parameters. Furthermore, there exists a good fit between the relative non-linear parameters of longitudinal waves and the concrete carbonation process. The relative non-linear parameters of longitudinal waves demonstrate feasibility in the quantitative assessment of concrete carbonation.

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Nomachi, Hiroshi. "Current Analytical Technology of Hardened Concrete." Concrete Journal 28, no. 10 (1990): 25–33. http://dx.doi.org/10.3151/coj1975.28.10_25.

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Journal articles on the topic 'Concrete technology'

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