Готові списки джерел за темами / Recycled concrete sand

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Автор: Grafiati

Опубліковано: 9 липня 2022

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Статті в журналах з теми "Recycled concrete sand"

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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Boudina, Tounsia, Dalila Benamara, and Rebih Zaitri. "Optimization of High-Performance-Concrete properties containing fine recycled aggregates using mixture design modeling." Frattura ed Integrità Strutturale 15, no. 57 (June 22, 2021): 50–62. http://dx.doi.org/10.3221/igf-esis.57.05.

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This investigation means to predict and modeling the fresh and hardened concrete behavior containing fine aggregates from concrete and brick wastes, for different recycled aggregates substitution rates. To succeed this, the design of experiments DOE method was used. It is observed that slump of recycled concrete is significantly influenced by the content in recycled concrete aggregates (RCA), natural sand (NS) and recycled brick aggregates (RBA), respectively.The compressive strength (CS) reaches a maximum value of 83.48 MPa with factors values of 25% RBA, and 75% RCA. And HPC’s based on RBA sand presented greater values of flexural strength at 7 days than HPC’s based on RCA sand, it was revealed that this is due to the RBA fines pozzolanic reaction and the production of new CSHs, which leads to better cement matrix densification.Under optimal conditions, themaximum desirability is 0.65, who has given HPC no added natural sand, by mixing recycled sands RBA (9.5%) with RCA (90.5%).The statistical terms result show that the expected models are very well correlated with the experimental data and have shown good accuracy.

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Soultana, Athanasia, Michael Galetakis, Anthoula Vasiliou, Konstantinos Komnitsas, and Despina Vamvuka. "Utilization of Upgraded Recycled Concrete Aggregates and Recycled Concrete Fines in Cement Mortars." Recent Progress in Materials 03, no. 03 (February 11, 2021): 1. http://dx.doi.org/10.21926/rpm.2103035.

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Waste concrete is the most predominant constituent material among construction and demolition waste. Current waste concrete recycling is limited to the use of recycled concrete aggregates as a road-base material and less as aggregates in new concrete mixes. Further, the production of recycled concrete aggregates results in the generation of a high amount of fines, consisting mainly of cement paste particles. Hence, this study aims to produce the cement mortars using the upgraded recycled concrete aggregates (sand granulometry) for the total replacement of natural aggregates and recycled concrete fines activated through a thermal treatment method as a partial cement substitution material. Cement mortar specimens were tested for their compressive and flexural strength, density and water absorption performance. The results showed that the combined usage of upgraded recycled concrete sand for total replacement of primary crushed sand and recycled concrete fines as partial cement replacement material is a promising option to produce cement mortars.

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Zhao, Ya Jun, Ying Gao, and Li Li He. "Effect of Admixed Recycled Aggregate on Properties of Recycled Concrete." Applied Mechanics and Materials 174-177 (May 2012): 743–46. http://dx.doi.org/10.4028/www.scientific.net/amm.174-177.743.

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The mixture proportion of recycled concrete was discussed by orthogonal design method. The influence of water-cement ratio, recycled aggregate quantity on workability, cube compressive strength of recycled concrete was analyzed. The experimental results indicated that，Recycled concrete mix proportion design should consider the impact of the water absorption of recycled aggregate. Unit water amount of recycled concrete should be plain concrete unit water consumption and recycled aggregate additional amount of water. Sand ratio should increase in the corresponding ordinary aggregate concrete sand ratio on the basis of 1 to 3 percent. When the water-cement ratio is 0.36 and construction waste content of 40% slag content of 20%, 28d compressive strength of concrete is 48.1MPa, slightly higher than the reference concrete (48.0MPa).

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Hamid, Roszilah, and M. A. Zubir. "The Flexural Properties of Reinforced Recycled Glass Concrete Beam." Materials Science Forum 803 (August 2014): 325–29. http://dx.doi.org/10.4028/www.scientific.net/msf.803.325.

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In this study, recycled glass is used to replace the natural fine aggregate in different mix proportions. The control samples are Grade 30 ordinary Portland cement concrete (OPCC) containing 100% natural sand and coarse aggregate. The recycled glass concretes contain 70% natural fine aggregate + 30% size 300 micron crushed glass (Sample 2), and 70% fine aggregate + 15% size 300 micron crushed glass + 15% size greater than 300 micron crushed glass (Sample 3).The recorded strength of the control, Sample 2 and 3 at 90 days are 47, 61 and 55 MPa. Although the compressive strength for the concrete samples with recycled glass are higher than the control samples, the flexural test results show that, concrete with recycled glass has less ability to be fully functioning as a reinforced concrete by exhibiting their flexural strength at 91 % and 84% of the theoretical flexural strength whereas for the control specimen, its flexural strength is 10% higher than the theoretical value. Nonetheless, the toughness index of recycled glass concrete with 30% replacement of fine sand with recycled glass powder is at par with the control samples, which shows the ductile behavior of the recycled glass concrete.

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Lin, Yuezhong, Xingxing Zhang, and Yachao Wang. "Research on the performance of recycled concrete powder self-leveling mortar based on orthogonal experiment." E3S Web of Conferences 198 (2020): 01011. http://dx.doi.org/10.1051/e3sconf/202019801011.

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Waste concrete in the construction waste is reprocessed into concrete sand and powder [1]. Recycled concrete sand with a particle size between 0.15 and 0.25mm partially replaces natural sand, and the recycled concrete powder with a particle size less than 0.075mm partially replaces cement. The five-factor four-level orthogonal experiment was used to study the replacement amount of recycled concrete powder, the replacement amount of recycled concrete sand, the amount of dispersible latex powder, the amount of polycarboxylate water-reducing agent, the ratio of bone cement, and the five factors on the fluidity of self-leveling mortar. The influence of the three performance indicators of bond tensile strength and dimensional change rate; through the range analysis of the above indicators. The analysis results show that the content of recycled concrete powder instead of cement has the greatest impact on the tensile bond strength and dimensional change rate of recycled concrete powder self-leveling mortar, and the content of Polycarboxylate Superplasticizer has the greatest influence on the fluidity.

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Nedeljković, Marija, Jeanette Visser, Siska Valcke, and Erik Schlangen. "Physical Characterization of Dutch Fine Recycled Concrete Aggregates: A Comparative Study." Proceedings 34, no. 1 (November 18, 2019): 7. http://dx.doi.org/10.3390/proceedings2019034007.

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In the Netherlands, yearly 20 Mt Construction- and Demolition waste (CDW) is being produced mainly consisting of concrete and masonry rubble. This is two third of the yearly production of concrete (33 Mt). Currently, less than 1 Mt/year of the 20 Mt/year CDW is recycled in new concrete (mainly as coarse recycled concrete aggregates). This preliminary study being part of a larger study, is aiming to increase that amount, amongst others by focusing on use of the fine recycled concrete aggregates. Fine recycled concrete aggregates (fRCA) appear promising for (partial) replacement of natural fine aggregates (sand) and cement in new concrete. Nevertheless, they can be expected to have adverse properties and components that may reduce the performance of the concrete. Their physical, chemical and mechanical properties, which thus may significantly differ from that of natural sand, are still far from being fully investigated. The present paper focusses on characterization of physical properties of fRCA for finding the most critical indicators for fRCA quality. The tests include particle size distribution, morphology, BET surface area, solid density and water absorption of individual and total fractions (0–0.25 mm, 0.25–4 mm and 0–4 mm). The tests are performed on three fRCAs with different origin. Natural river sand with 96 wt.% of SiO2 was also studied to provide a baseline for comparison. Experimental results showed that, on the one side, the particle size distribution, surface area and amounts of individual fractions of fRCAs are significantly different from that of natural sand and that there is a large difference between each other. This is caused by variations of the parent concrete properties and by the type of recycling technique and processes (one step or multiple steps crushing). On the other side, fRCAs have comparative solid densities, which were still lower than that of natural sand. It was also shown that difference in water absorption between fractions 0.25–4 mm and 0–4 mm is very small in all three fRCAs groups. The results of this study will be used for future correlations between investigated properties of fRCAs with properties of concretes with fRCAs. This will be investigated in the next stage of the project, such that these correlations can enable production of durable concretes with fRCAs and assist recyclers in optimization of their production processes based on quality control of fRCAs.

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Miyazaki, Yuji, Takeshi Watanabe, Yuji Yamada, and Chikanori Hashimoto. "Properties of Concrete Using Treated Low-Class Recycled Coarse Aggregate and Blast Furnace Slag Sand." Materials 13, no. 4 (February 13, 2020): 843. http://dx.doi.org/10.3390/ma13040843.

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Since high quality natural aggregates are becoming scarce, it is important that industrial recycled products and by-products are used as aggregates for concrete. In Japan, the use of recycled aggregate (RG) is encouraged. Since, strength and durability of recycled aggregate concrete is lower than that of normal aggregate concrete, the use of recycled aggregate has not been significant. In order to improve physical properties of concrete using recycled coarse aggregate, blast furnace slag sand has been proposed. Recently, blast furnace slag sand is expected to improve durability, freezing, and thawing damage of concrete in Japan. Properties of fresh and hardened concrete bleeding, compressive strength, and resistance to freezing and thawing which are caused by the rapid freezing and thawing test using liquid nitrogen is a high loader than the JIS A 1148 A method that were investigated. As a result, concrete using treated low-class recycled coarse aggregate and 50% or 30% replacement of crushed sand with blast furnace slag sand showed the best results, in terms of bleeding, resistance to freezing and thawing.

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Zhang, Yancong, Lingling Gao, and Wei Bian. "Mechanical Performance of Concrete Made with Recycled Aggregates from Concrete Pavements." Advances in Materials Science and Engineering 2020 (September 15, 2020): 1–8. http://dx.doi.org/10.1155/2020/5035763.

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This research aims at analysing the mechanical performance of concrete with recycled aggregates from concrete pavements. First, the characteristics of various natural and recycled aggregates used in the concrete were thoroughly analysed. The composition of the recycled aggregates was determined and several physical and chemical tests of the aggregates were performed. In order to evaluate the mechanical performance of recycled concrete, cube compressive strength and flexural tensile strength tests were performed. The effect of recycled aggregates on the strength of recycled concrete is related to the strength of recycled aggregates, the strength of natural aggregates, and the strength of old concrete. The strength of recycled concrete decreases with increasing water-cement ratio. However, due to the water absorption of the recycled aggregate, it has a certain inhibitory effect on the strength reduction. As the replacement rate of recycled aggregates increases, the optimal sand ratio decreases. The sand ratio is controlled between 32% and 38%, which is ideal for recycled concrete. With the increase of fly ash content, the 7 d strength of recycled concrete has decreased to some extent, but the 28 d strength has been slightly improved. In addition, for compressive strength and flexural tensile strength, the optimal content of fly ash is different.

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Wongkvanklom, Athika, Patcharapol Posi, Sahalaph Homwuttiwong, Vanchai Sata, Ampol Wongsa, Duangkanok Tanangteerapong, and Prinya Chindaprasirt. "Lightweight Geopolymer Concrete Containing Recycled Plastic Beads." Key Engineering Materials 801 (May 2019): 377–84. http://dx.doi.org/10.4028/www.scientific.net/kem.801.377.

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Utilizing recycled plastic beads (RPB) as lightweight waste aggregates in the concrete and geopolymer application is quite attractive. This study presented the mechanical behavior, density, porosity, water absorption, abrasion resistance, thermal conductivity, and ultrasonic pulse velocity (UPV) of geopolymer lightweight concrete containing RPB. River sand in each mixture was replaced by various proportions of RPB ranging between 0-100% by weight. Sodium hydroxide concentration of 15 M, activator solution to fly ash ratio (L/A) of 0.40, sodium silicate and sodium hydroxide ratio of 1.0, and aggregate to fly ash ratio of 1.0 were used throughout the experiment. The results indicated that the replacement of sand by 25% and 50% of RPB had a positive impact on the weight, density, water absorption, and thermal insulating property. The strength and density of the concretes met the minimum requirements of structural lightweight concrete according to ASTM C330.

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Більше джерел

Дисертації з теми "Recycled concrete sand"

Taha, Bashar. "The use of mixed colour waste recycled glass as sand/cement replacement in structural concrete." Thesis, University of the West of England, Bristol, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.429538.

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Martinez, Hernandez Heriberto. "Amélioration de granulats de béton recyclé par bioprécipitation." Thesis, Ecole centrale de Nantes, 2022. http://www.theses.fr/2022ECDN0009.

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Les granulats de béton recyclé (GBR) contiennent, de par leur origine, de la pâte de ciment résiduelle qui leur confère une forte porosité et des performances modérées. La porosité conduit à une absorption d’eau forte. C’est une difficulté importante sur le plan industriel car elle complique l’ajustement de l’eau dans les bétons qui permet de maitriser leur ouvrabilité en production. Le processus de fabrication des GBR conduit à avoir plus de pâte dans les particules les plus fines et donc plus d’absorption. En conséquence, si aujourd’hui l’industrie recycle relativement bien les gravillons de GBR dans les bétons, elle utilise peu les sables de GBR, du fait de leur plus grande porosité. Or, lors de la fabrication des GBR, on obtient environ 50 % de sables et 50 % de gravillons. En conséquence, la porosité des sables de GBR est un frein à l’économie circulaire du béton. Un certain nombre de techniques ont été proposées pour éliminer ou améliorer la pâte de ciment résiduelle mais elles posent des problèmes de coût. La carbonatation naturelle des GBR par le CO2 atmosphérique contribue à diminuer leur absorptiond’eau en obstruant leur porosité, mais c’est une réaction qui dure plusieurs mois. Des recherches sont en cours pour faire de la carbonatation accélérée (en concentrant le CO2 par exemple) à l’échelle industrielle.Le présent travail explore une idée alternative quiconsiste à former en quelques jours, à l’aide debactéries biocalcifiantes, une gangue de CaCO3 autourdes GBR et surtout de la partie sableuse, afin de limiterl’accès de l’eau à leur porosité.Dans un premier temps,des bactéries candidates non pathogènes ont étéidentifiées, sélectionnées, adaptées au milieu alcalin desGBR, puis nous avons vérifié leur aptitude à produire duCaCO3. Dans un second temps, nous avons déterminéles conditions qui favorisent une croissance des bactéries et une production de CaCO3 homogènes sur la surface de milieux gélosés modèles. L’homogénéité est en effet une condition sine qua non pour obtenir une bonne étanchéité à l’eau. Nous avons ainsi confirmé l’intérêt de sélectionner des bactéries capables de produire du biofilm. Enfin, les procédés développés ont été appliqués à des disques de mortier modèles facilitant les observations visuelles. Les résultats préliminaires confirment qu’il est possible de faire baisser l’absorption de ces mortiers de façon notable à l’échéance d’un mois. Des travaux supplémentaires sont nécessaires pour confirmer ces résultats encourageants sur sable de GBR
Recycled concrete aggregates (RCA) contain, due to their origin, residual cement paste which gives them high porosity and moderate performance. The porosity leads to a strong water absorption. This is a major difficulty on the industrial level because it complicates the adjustment of water in concrete batches, which allows to control their workability in production. The RCA manufacturing process results in having more paste in the finer particles and therefore more absorption. As a result, while the industry today recycles coarse RCA into concrete relatively well, it uses small amounts of RCA sand because of their greater porosity. Yet, during the manufacture of RCA, about 50% sand and 50% coarse aggregates are obtained. Consequently, the porosity of RCA sand hinders the circular economy of concrete. A number of techniques have been proposed for removing or improving the residual cement paste, but they are expensive. The natural carbonation of RCA by atmospheric CO2 helps with decreasing their water absorption by obstructing their porosity, but this is a several month reaction. Research is ongoing to make accelerated carbonation (by concentrating CO2, for example) on an industrial scale. The present work explores an alternative idea, which consists in forming in a few days, using biocalcifying bacteria, a matrix of CaCO3 around the RCA and especially the sand part, in order to limit the access of water to their porosity. First, candidate non-pathogenic bacteria were identified, selected, adapted to the alkaline medium of RCA, then we checked their ability to produce CaCO3. In a second step, we detemined the conditions, which favor uniform bacterial colonization and production of CaCO3 on the surface of model agar media. Homogeneity is indeed mandatory to obtain good water tightness. We thus confirmed the value of selecting bacteria capable of producing biofilm. Finally, the methods developed were applied to model mortar disks facilitating visual observations. Preliminary results confirm that it is possible to significantly lower the absorption of these mortars within one month. Further work is needed to confirm these encouraging results on sand part of RCA

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Solyman, Mahmoud. "Classification of recycled sands and their applications as aggregates for concrete and bituminous mixtures." Kassel Kassel Univ. Press, 2006. http://deposit.d-nb.de/cgi-bin/dokserv?idn=985589396.

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Solyman, Mahmoud [Verfasser]. "Classification of recycled sands and their applications as aggregates for concrete and bituminous mixtures = Klassifizierung von Recycling-Brechsanden und ihre Anwendungen für Beton und für Straßenbaustoffe / Mahmoud Solyman." Kassel : Kassel Univ. Press, 2006. http://d-nb.info/985589396/34.

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Da-ChainChang and 張大謙. "Application of Recycled Concrete and Basic Oxygen Furnace Slag Sand in Dense Grade Asphalt Concrete." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/22f6y3.

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碩士
國立成功大學
土木工程學系
106
In this study, recycled concrete and basic oxygen furnace slag sand were used in dense grade asphalt concrete, recycled concrete replaced natural coarse aggregates, basic oxygen furnace slag sand replaced natural sand, then evaluate Marshall Design and engineering properties tests. According to the results of engineering properties tests, when the natural coarse aggregates are replaced by recycled concrete, the optimum asphalt content required is greatly improved, and the VFA also has a tendency to increase. Although it does not affect the engineering properties, but if it is in actual paving when building, the pavement may be oily. The engineering properties of replacing natural coarse aggregates with recycled concrete and basic oxygen furnace slag sand have a downward trend, but most of them still meet the specification. In which the Index Retained Strength (IRS value) has better performance when replaces natural coarse aggregates with recycled concrete. When replacing the natural aggregates with recycled concrete and basic oxygen furnace slag sand, although it can meet the specification, the quality and cost still need to be further explored.

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Solyman, Mahmoud [Verfasser]. "Classification of recycled sands and their applications as fine aggregates for concrete and bituminous mixtures = Klassifizierung von Recycling-Brechsanden und ihre Anwendungen für Beton und für Straßenbaustoffe / vorgelegt von Mahmoud Solyman." 2005. http://d-nb.info/976291770/34.

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Частини книг з теми "Recycled concrete sand"

Nováková, Iveta, and Boy-Arne Buyle. "Sand Replacement by Fine Recycled Concrete Aggregates as an Approach for Sustainable Cementitious Materials." In RILEM Bookseries, 425–31. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-22034-1_48.

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Mehsas, B., A. Noui, L. Belagraa, and S. Slimani. "Study of Physico-Mechanical Characteristics of Concrete Made with Recycled Gravel and Prepared Sand." In Proceedings of the 4th International Symposium on Materials and Sustainable Development, 163–74. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-43211-9_15.

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Sharma, Rachit. "Stress–Strain Characteristics of Natural and Recycled Aggregate Concrete with Waste Foundry Sand and Additives." In Lecture Notes in Civil Engineering, 291–304. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-9554-7_26.

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Rajesh, Kanta Naga, and Ponnada Markandeya Raju. "Performance of Recycled Plastic Waste and Used Foundry Sand as a Replacement of Fine Aggregate in Concrete." In Lecture Notes in Civil Engineering, 735–47. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-8433-3_61.

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Khalid, Faisal Sheikh, Mohamad Yuzwan Aliff Aminuddin, Nur Fatin Nabila Hissham, Aeslina Abdul Kadir, Mohd Irwan Juki, Shahiron Shahidan, and Syafiqa Ayob. "Density, Compressive Strength and Water Absorption Properties of Sand Cement Brick Containing Recycled Concrete Aggregate (RCA) and Crumb Rubber (CR) as Partial Sand Replacement Materials." In Lecture Notes in Civil Engineering, 211–29. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-4918-6_11.

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Ramlan, Ridhuan, Shahiron Shahidan, Nor Najihah Zainol, Sharifah Salwa Mohd Zuki, Alif Syazani Leman, Sajjad Ali Mangi, Ma Chau Khun, and Fadzli Mohamed Nazri. "Thermal Conductivity of Crumb Rubber as Partial Sand Replacement and Recycled Aggregates as Partial Coarse Aggregate Replacement in Concrete." In Proceedings of AICCE'19, 1007–13. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-32816-0_75.

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Izoret, L., C. Diliberto, J. M. Mechling, A. Lecomte, and P. Natin. "Recycled concrete sand as alternative raw material for Portland clinker production." In Concrete Recycling, 63–81. CRC Press, 2019. http://dx.doi.org/10.1201/9781351052825-7.

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"Versatility of Cockle Shell in Concrete." In Recycled Waste Materials in Concrete Construction, 71–85. IGI Global, 2019. http://dx.doi.org/10.4018/978-1-5225-8325-7.ch005.

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A conspectus based upon a compelling topic, namely, versatility of cockle shell use in concrete to replace partially the natural coarse aggregates and river sand, which is yet to be investigated, is covered in this chapter. An introduction to enlighten the reader with this promising waste material precedes a review of environmental issues with cockle shell which would reduce harm to environment and preserve natural materials for future generation. Cockle trade is an important subtitle that covers cockle shell waste generation, research, and development related to the deployment on the use of cockle shell, processing cockle shell for making construction material are discussed in detail. Experiments were conducted, and the test data revealed that the use of cockle shell as partial replacement of coarse aggregates enhanced the strength of concrete and as partial replacement of sand improved the performance of mortar bricks.

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Del Angel, Gilberto Garcia, and Carlos Thomas. "The use of foundry sand for recycled aggregate concrete." In The Structural Integrity of Recycled Aggregate Concrete Produced with Fillers and Pozzolans, 3–24. Elsevier, 2022. http://dx.doi.org/10.1016/b978-0-12-824105-9.00014-7.

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Wesley, David T. A., and Sheila M. Puffer. "The End of Sand." In Reusable and Sustainable Building Materials in Modern Architecture, 1–27. IGI Global, 2019. http://dx.doi.org/10.4018/978-1-5225-6995-4.ch001.

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This chapter focuses on how sand, the second most used natural resource on earth after water, is facing one of the greatest environmental challenges of the new millennium. Sand is a crucial material used in all sorts of building projects, from asphalt, concrete, and glass. Globally, construction accounts for the largest portion of the 15 billion tons of sand consumed annually. Yet, sand is a finite resource and the depletion of alluvial sand used in construction is destroying the ecosystem of riverbeds, sea beds, and coastal beaches, and is contributing seriously to climate change. This chapter will discuss how these threats have developed, including coastal construction and erosion, river dredging, and sand “mafias” whereby illegal sand miners strip beaches and use sand in inferior concrete that has led to building collapses and deaths. The authors then discuss potential solutions to this crisis, including regulation and enforcement of environmental and construction standards, as well as materials substitution such as desert sand, sand created from sandstone, and recycled glass.

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Тези доповідей конференцій з теми "Recycled concrete sand"

Bourguiba, Amal, Elhem Ghorble, and Wadia Dhaoui. "Epoxy Resin/Recycled Sand Mortars’ Resistance to Chloride Ions Diffusion." In 10th International Conference on Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structures. Reston, VA: American Society of Civil Engineers, 2015. http://dx.doi.org/10.1061/9780784479346.100.

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"Use Of Recycled Glass As Partial Replacement Of Natural Sand In Tile Adhesive Mortars." In SP-305: Durability and Sustainability of Concrete Structures. American Concrete Institute, 2015. http://dx.doi.org/10.14359/51688595.

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Min, Byung Youn, Wang Kyu Choi, Jung Woo Park, Chong Hun Jung, and Won Zin Oh. "The Technical Development for Reuse of Radioactive Concrete Waste Generated by Dismantling of Nuclear Facilities." In 16th International Conference on Nuclear Engineering. ASMEDC, 2008. http://dx.doi.org/10.1115/icone16-48315.

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As part of a fundamental study for the reuse and recycling of contaminated concrete wastes generated by dismantling a research reactor, KAERI has been developing separation technology which recovers for reuse and recycling aggregates from the dismantled concrete. The separation is based on a thermal treatment followed by mechanical processes such as a crushing, milling and sieving. The separation test of concrete waste (i.e., light concrete and heavy concrete) was performed using radioisotope (60Co). The distribution of 60Co has been investigated for the effects of the heating temperature, washing and aggregate size such as gravel, sand and paste using a mechanical and thermal unit process. The experimental results showed that most of the 60Co nuclide could be removed from the gravel, sand aggregate and concentrated into a paste. Especially, we found that the heating temperature played an important role in separating the 60Co nuclide from the concrete waste. The optimum heating temperature for the removal of the 60Co was about 500°C. According to an increase of the heating temperature, the amount of transferred 60Co to the paste linearly increased because the bond between the aggregate and paste matrix is reduced. Contamination of concrete is mainly concentrated in the porous paste and not in the dense aggregate such as the gravel and sand. Concrete can be separated into contaminate and clean parts by means of a unit process based on a crushing, heating, milling and sieving at over 1mm. Through experiments, the clean aggregate can be reused and recycled by up to 70%. By thermally and mechanically separating this concrete waste from the clean dense aggregate particles, a considerable volume reduction can be reacted.

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"A Systematic Study on Physical and Mechanical Properties of No-Fine Concrete with Additives." In Recent Advancements in Geotechnical Engineering. Materials Research Forum LLC, 2021. http://dx.doi.org/10.21741/9781644901618-24.

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Abstract. No-fine concrete (also called as pervious concrete or porous concrete) is a lightweight concrete made up of primary binder and coarse aggregates with little or no sand. Due to the reduced amount or absence of fines, it produces large number of voids which improves permeability to greater extent. Hence this type of concrete can be used in pavements and in parking lots. The literature review is carried out to study the physical and mechanical properties of no-fine concrete with additives. Various reports were collected and studied about variation in physical and mechanical properties of pervious concrete with different additives. Additives may be either mineral additives (fly ash, silica fumes, rice husk ash etc..,) or chemical additives (plasticizers, super plasticizers, retarders etc..,). Our project involved the utilization of recycled coarse aggregates, fly ash and rice husk in no-fine concrete. After this study, it was concluded that ‘upon the addition of additives, it increases permeability by decreasing its strength and vice-versa’. Balancing its permeability and strength remains challenging.

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Loganayagan, S. "Study on Controlled Low Strength Materials using GGBS with Dredged Soil and M-Sand." In Sustainable Materials and Smart Practices. Materials Research Forum LLC, 2022. http://dx.doi.org/10.21741/9781644901953-39.

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Abstract. In general, CLSM mixtures contain common ingredients such as Portland cement, fly ash, good mixing and water. CLSM is forced to fill in the back material and not low-strength concrete, rather it can best be described as property which is designed as concrete and strength flow and strength as per requirement and used as a backfill to avoid soil issues. CLSM can be built with a variety of strengths and sizes, taking into account costs future requirements, low power CLSM will be required to allow future excavation, and if there is no space for future digging the energy can be high on the other hand, furthering the size of CLSM can be adjusted according to the cost and material requirements. However, some industrial products and recycled products are also accepted and promoted as long as they are available, costing a particular use and the necessary characteristics of a combination such as flow, power, extraction, and quantity are acceptable. The aim of this study was to test whether it was possible to apply red mud such as placing a portion of Portland cement in a low-power controlled (CLSM) component made of industrial-grade products. The control mixture was initially made from the Portland cement, fly ash, and water. Bleeding, flow, the initial time for the setting of new CLSM compounds is measured and subsequent complications include compression. Results-They performed well and complied with CLSM requirements at ACI 229 levels in terms of flow, bleeding rate, initial set-up time, uncompressed compression strength. Low power control devices (CLSM) remove the problems of ground receding to provide the strength of the supporting structure.

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Benshak, Alice Bernard. "An Assessment of the Approaches of Construction and Demolition Waste in Jos, Plateau State of Nigeria." In Post-Oil City Planning for Urban Green Deals Virtual Congress. ISOCARP, 2020. http://dx.doi.org/10.47472/sebh6010.

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The continuous rise in population, urbanization and expansion of cities has triggered a corresponding increase in construction and demolition activity. The frequent collapse of buildings attributed to poor structural design, building decay, and/or use of substandard materials has generated a substantial increase in construction refuse, also referred to as Construction and Demolition (C&D) Waste. This waste stream originates from residential, commercial, agricultural, institutional and industrial building projects for new builds, reconstruction, expansion, and refurbishments/rehabilitation. Most studies in Nigeria have generally focused on solid waste management without considering the uniqueness of C&D and giving it the attention needed, in order to achieve sustainable urban spaces that are highly functional, safe, convenient, and livable. This study seeks to investigate the different approaches and processes of C&D waste management in the City of Jos, in the Plateau State of Nigeria. The mix method was adopted for this research whereby quantitative and qualitative data was collected through a structured questionnaire for construction enterprises, as well as face-to-face interviews with the agencies responsible for waste management in the city. A total of 21 construction companies (representing about 10%) were randomly selected for questionnaire administration while interviews were conducted with the Plateau Environmental Protection and Sanitation Agency (PEPSA) and the Jos Metropolitan Development Board (JMDB) who are responsible for waste management. Investigations revealed that C&D waste consists of heavy and non-degradable materials such as: sheet metal roofing, sand, gravel, concrete, masonry, metal, and wood to mention only a few. The construction companies are solely responsible for: the collection, storage, transportation and disposal of wastes generated from their activities. Approximately 60-70% of the C&D waste materials are either reused, recycled or resold, while the remaining residual waste is indiscriminately disposed. Although the PEPSA and JMDB are responsible for waste management, their focus has been on establishing solid non-hazardous waste infrastructure systems, policies and plans. The absence of records of the quantity of C&D waste generated, the lack of financial data, and the omission of policies and plans for the C&D waste stream has resulted in a missed opportunity for a comprehensive and sustainable waste management strategy for the City and the state. To protect public health, valuable resources, and natural ecosystems, it is recommended that the C&D waste stream be included as part of the state’s waste management program, in consideration of the growing construction and demolition activity, by including C&D policies and guidelines.

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