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6/25/2019 · The unit weight of the concrete ranged from 2365 to 2175 kg/m 3, depending on aggregate content (Figure 6).Increasing the recycled aggregate content reduces the unit weight and density of the concrete, resulting in lighter concrete (Figure 6).The unit weights of the 15%, 20%, and 25% mixes were reduced by 8%, 11%, and 11.5%, respectively, compared to plain concrete.
7/13/2006 · Recycled aggregate concrete as structural material Recycled aggregate concrete as structural material Etxeberria, M.; Marí, A.; Vázquez, E. 2006-07-13 00:00:00 The use of recycled aggregates in concrete opens a whole new range of possibilities in the reuse of materials in the building industry. The utilisation of recycled aggregates is a good solution to the problem of an excess of …
Why not recycled concrete? Date: ... in the journal Science questioned whether human's combined environmental impact has caused the planet to enter a new geological epoch, the "Anthropocene." The ...
Use of recycled aggregate in concrete can be useful for environmental protection and economical terms. Recycled aggregates are the materials for the future. The application of recycled aggregate has been started in many construction projects in many European, American and Asian countries.
Recycled Aggregates (www.cement.org) — Construction materials are increasingly judged by their ecological characteristics. Concrete recycling gains importance because it protects natural resources and eliminates the need for disposal by using the readily available concrete as an aggregate source for new concrete or pavement sub-base layers.
The use of recycled concrete aggregate (RCA) in concrete as partial and full replacements of natural coarse aggregate is growing interest in the construction industry, as it reduces the demand for virgin aggregate. In addition, the use of RCA leads to a possible solution to...
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International Journal of Science and Research (IJSR) is published as a Monthly Journal with 12 issues per year. Significance of Silica Fume and Glass Fiber on the Mechanical Properties of Recycled Aggregate Concrete
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Berndt (2009) found that recycled aggregate concrete mixtures containing 50% slag gave the best overall performance of vibrated concrete. Kou . et al. (2007) reported that SCC with class F fly ash improves the mechanical and durability properties of recycled aggregate concrete. Kou and al.
If concrete is not recycled, it ends up in a landfill, and in most urbanized nations, there is a decline of available disposal sites.Sources of good quality aggregates are becoming depleted, so the reuse of concrete as aggregates makes economic and environmental sense.Glass, paper, and rubber can also be used in recycled concrete. Read More
recycled aggregate to 80% recycled aggregate and with more percentage replacement of recycled aggregate used in the concrete specimen, the percentage of tensile strength remained are gradually decreasing. 3. Concrete made with recycled aggregate produced from construction and demolition waste has a compressive strength
Evangelista, L., and de Brito, J. Mechanical behaviour of concrete made with fine recycled concrete aggregates. Cement and Concrete Composites, 29(5), (2007) 397-401. Geng, J., and Sun, J. Characteristics of the carbonation resistance of recycled fine aggregate concrete. Construction and Building Materials, Vol. 49, (2013) 814-820. Anastasiou ...
This paper examines the performance of recycled aggregate concrete made up of 60% recycled aggregates of 20 mm size in terms of durability tests namely rapid chloride permeability, drying shrinkage, water permeability, modulus of elasticity and creep without compromising the compressive strength.
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.
Concrete with fine recycled aggregates: a review: European. This paper presents a review of the literature published so far on the use of fine aggregates from construction demolition waste used as a partial or total replacement of fine natural aggregates in concrete production The review presents the initial works on this subject and an overview of the existing regulations It goes on to ...
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Recycled aggregate occurs as either recycled concrete aggregate (RCA) or recycled asphalt pavement (RAP). Recycling concrete and asphalt has been taking place in the USA since at least the early 1970s (Nanasy 1972), and by the 1990s was a well-established activity.
Concrete is the most used man-made material in the world since its invention. The widespread use of this material has led to continuous developments such as ultra-high strength concrete and self-compacting concrete. Recycled Aggregate in Concrete: Use of Industrial, Construction and Demolition...
No significant increase in the strength of recycled aggregate concrete was obtained by reducing the W/C ratio below 0.40. It is indicated that the quality of recycled aggregate concrete will improve with the quality of recycled mortar or if the recycled material has a high aggregate-cement ratio.
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The environmental impact of recycled aggregate (wet) was up to 16~40% higher compared with recycled aggregate (dry); the amount of energy used by impact crushers while producing wet recycled aggregate was the main cause for this result.
Dr. Xiao’s main areas of research are in the material behavior and structural performance of recycled aggregate concrete, aspects he has been exploring for the past 15 years. He is the author or co-author of more than 300 papers on material properties and material behavior, interfacial layer mechanisms, and modeled recycled aggregate concrete.
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is used for preparing fresh concrete. The amount of recycled coarse aggregate used in this research is approximately 125 kg. Many researchers state that recycled aggregates are only suitable for non-structural concrete application. This research, however, shows that the recycled aggregates that are obtained from concrete specimen make good ...
It is common practice in the U.S. to crush old concrete pavements at the end of their service lives into recycled concrete aggregate and then reuse them in the base course of new pavements. It is not, however, common to use the recycled concrete aggregate (RCA) in the new concrete pavement itself.
the recycled aggregate concrete is almost 85% and 80% of natural aggregate concrete. Amn on.et.al (2002), concrete having a 28 -day compressive strength of 28 MPa was crushed at ages 1, 3 and 28 days to serve as a source of aggregate for new concrete,
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