Mining machinery manufacturers
Mining machinery manufacturers
Recycled aggregate (RA) obtained from crushed concrete rubble, instead of being stored, can be reused in building industry. An attempt has been made to study the possibility of reusing the recycled concrete aggregate from demolished structures in the place of fresh aggregate.
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The experimental procedures were carried out in the following order: 72 interlocking concrete cubes were produced under controlled temperature with ratio 1:3 and 1:4 respectively and it was cured through immersion method. Compressive strength of concrete cubes was determined after curing for 7 days, 14 days, 21 days and 28 days respectively.
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Sustainability. The LEED Green Building Rating System recognizes recycled concrete in its point system. Credit 4 (Materials and Resources) states, "specify a minimum of 25% of building materials that contain in aggregate a minimum weighted average of 20% post-consumer recycled content material, OR, a minimum weighted average of 40% post-industrial recycled content material."
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All the physical properties of recycled aggregate studied in this work have shown the effect on strength of concrete. Hence it is essential to study the physical properties of recycled aggregate prior to use in concrete. References. Limbachiya, M. C., Leelawat, T. and Dhir, R. K. (2000), Use of Recycled Concrete Aggregate in
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The method for recycling construction and demolition fines involves using mixed fines from construction and demolition debris that would otherwise be disposed of at landfills as an ingredient in cement or concrete. The mixed fines contain a plurality of materials selected from the group consisting of asphalt, plastics, ceramics, fiberglass and batt insulation, soil, dust, drywall, wood .
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the 57 days of exposure. These results suggest the absence of reactive aggregates in commercial crushed concrete. The laboratory CC samples stored in alkaline solution, on the other hand, exceeded the expansion limit, likely due to the presence of reactive aggregates in the crushed concrete. -0.04-0.02 0.00 0.02 0.04 0.06 0 102030 40506070 TIME .
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Oct 19, 2016 · The effect of recycled aggregate concrete incorporating waste paper sludge ash as partial replacement of cement . H. " Sustainable concrete through reuse of crushed returned concrete ". . A. S. " Influence of recycled concrete aggregates on strength properties of concrete ".
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Recycled aggregates concrete, high strength, packing density . 1.0 Introduction . Today there is impressive increase in the use of recycled concrete, but basically these recycled aggregates are used as fillers in road construction and in low-level applications due to impurities and defects associated with recycled aggregates.(Tu, et al. 2006).
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K.-Y. Yeon, Y.-S. Choi, and S.-H. Hyun, "Properties of recycled polymer concrete using crushed polymer concrete as an aggregate," in Proceedings of the 2nd International Conference on Sustainable Construction Materials and Technologies, pp. 1299–1308, Università Politecnica delle Marche, Ancona, Italy, 2010. View at: Google Scholar
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Ravande Kishore, Bairagi,N.K., and Kumar.P., - STRENGTH CHARACTERISTICS OF CONCRETE MADE WITH RECYCLED FINE AGGREGATE AND CRUSHED STONE FINES, Proceedings, The 15th International Conference on Solid Waste Technology and Management, The Journal of Solid Waste Technology and Management, Philadelphia, U.S.A, December1999, pp – 4C.
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Fine and coarse aggregates make up the bulk of a concrete mixture. Sand, natural gravel, and crushed stone are used mainly for this purpose. Recycled aggregates (from construction, demolition, and excavation waste) are increasingly used as partial replacements for natural aggregates, while a number of manufactured aggregates, including air-cooled blast furnace slag and bottom ash are also .
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The paper presents the results of an investigation conducted to examine carbonation resistance of Self Compacting Concrete (SCC) made with coarse Recycled Concrete Aggregates (RCA). In total, five SCC mixes were prepared by systematically replacing coarse Natural Aggregates (NA) by RCA at 0, 25, 50, 75 and .
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However, due to scarcity of aggregates and in consideration of environmental sustainability, recycled crushed concrete aggregates were used as the coarse-grained layer in this project. The suitability of recycled crushed concrete aggregates as a material within the coarse-grained layer of a CBS is subject to the hydraulic property requirement.
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All the specimens were prepared at 1:1.5:3 with 0.50 w/c ratio and tested at 7, 14, 21, 28 and 56 days curing ages. It is observed from experimental analysis that the workability of fresh normal concrete is 7% and 10% greater than recycled aggregates concrete blended with 10% RHA and only recycled aggregates concrete without RHA respectively.
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Dec 01, 2013 · Free Online Library: Use of recycled concrete aggregate in concrete: a review.(Report) by "Journal of Civil Engineering and Management"; Engineering and manufacturing Aggregates (Building materials) Usage Waste management Concrete Chemical properties Mechanical properties Production processes Concretes Recycled materials
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The aim of this study was to develop a technique for the complete recycling of concrete based on microwave heating of surface modification coarse aggregate (SMCA) with only inorganic materials such as cement and pozzolanic materials (silica fume, fly ash). The mechanical properties of SMCA, which was produced using original coarse aggregate (OCA) and inorganic admixtures, as well as its .
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The investigations proved usability of fibre-concrete with recycled crushed concrete in certain applications. The composite has satisfactory material characteristics and its application would consume a great deal of recycled concrete aggregate. The paper will present the material parameters and its efficiency in examples of applications.
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Demolition and Reuse of Concrete and Masonry. Proceedings 3rd International RILEM Symposium, Odense, Den•ark, 24 - 27 October 1993. London, E & fN Spon. 1994. Available in CB Library, Ace. No. B43-IS-DR03-62647. c. de Vries P. Concrete recycled : Crushed concrete as aggregate. Concrete, 1993, 27(3), pages 9 - 13.
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This paper presents an experimental research on mechanical properties of recycled aggregate concrete (RAC) at low and high water/binder (W/B) ratios. Concrete at two W/B ratios (0.255 and 0.586) was broken into recycled concrete aggregates (RCA). A type of thermal treatment was employed to remove mortar attached to RCA.
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Jun 22, 2011 · Abstract. The effect of recycled coarse aggregate on concrete compressive strength was investigated based on the concrete skeleton theory. For this purpose, 30 mix proportions of concrete with target cube compressive strength ranging from 20 to 60 MPa were cast with normal coarse aggregate and recycled coarse aggregate from different strength parent concretes.
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This work studies the physical and mechanical properties of recycled concrete aggregate (recycled aggregate from concrete waste) and their influence in structural recycled concrete compressive strength. For said purpose, a database has been developed with the experimental results of 152 works selected from over 250 international references.
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Use of recycled concrete aggregates in high strength concreteMaterials and structures,Vol-33,November-2000, pp.574-580; Montgomery, D.G. and Sturgiss, D. 1996. Properties of Concrete Incorporating Recycled Concrete Aggregates. Proceedings of the NationalSymposium on the Use of Recycled Materials in Engineering Construction. Sydney.
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This study aims to valorize non-biodegradable waste through their recycling as aggregates in concrete. Concretes made from different types of recyclates (recycled concrete, glass and tire) and natural aggregates were made and tested in compression at 28 days. A modeling test of the resistance of the various concretes to compression has been carried out.
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Mar 30, 2011 · This paper reports the results of experimental investigations on recycled aggregate concrete. Properties of Recycled Concrete Aggregate Particle Size Distribution. The result of sieve analysis carried out as per IS 2386 for different types of crushed recycled concrete aggregate and natural aggregates.
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Mesoscale Analysis of Stress Distribution along ITZs in Recycled Concrete with Variously Shaped Aggregates under Uniaxial Compression. Journal of Materials in Civil Engineering, Vol. 27, Issue. 11, p.
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Replacement of Fine Aggregate by Crumb Rubber and Plastic Fines. Aravind S. M Tech student, Civil Department Ilahia College of Engineering & Technology. Kerala, India. Dr. Elson John. Asst.Professor, Civil Department Mar Athanasius College of Engineering. Kerala, India. Abstract Waste tyre and plastic management is a serious global concern.
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Jan 01, 2017 · This study relates to the use of the industrial waste as substitute to the natural aggregates. It relates to two types of waste: Crushed glass and waste tires. These wastes were incorporated into concrete for a partial substitution of the aggregates in the proportions of 5%, 10%, 15%, 20%, 25% and 30% for the same matrix (mortar). The compressive strength and the mode of .
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References 1 N. Banthia, and C. Chan Use of recycled aggregate in plain and fiber-reinforced shotcrete ACI, Concrete International 22 No. 6 June 2000 41 45 2 P. K. Metha Advancements in concrete technology ACI, Concrete International 21 No. 6 June 1999 69 76 3 A. L. A. Fraaij, H. S. Pietersen, and J. De Vries Performance of concrete with .
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[2] M. Tavakoli, P. Soroushian, Strengths of recycled aggregate concrete made using field-demolished concrete as aggregate, ACI Materials Journal 93 (1996)182-190. DOI: 10.14359/9802 [3] M.B. Oliveira, E. Vazquez, The influence of retained moisture in aggregates from recycling on the properties of new hardened concrete, Waste Management 16 .
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Apr 04, 2012 · Recycled aggregate (RA) obtained from crushed concrete rubble, instead of being stored, can be reused in building industry. An attempt has been made to study the possibility of reusing the recycled concrete aggregate from demolished structures in the place of fresh aggregate.
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