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Long-term mechanical and durability properties of recycled aggregate concrete prepared with the incorporation of fly ash
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In this paper, a long-term study on the mechanical and durability properties of concrete prepared with 0, 50% and 100% recycled concrete aggregate that were cured in water or outdoor exposure conditions for 10 years was presented.Abstract:
This paper presents the findings of a long-term study on the mechanical and durability properties of concrete prepared with 0%, 50% and 100% recycled concrete aggregate that were cured in water or outdoor exposure conditions for 10 years. The recycled aggregate concrete (RAC) was prepared by using 25%, 35% and 55% class-F fly ash, as cement replacements. It was found that, after 10 years, the compressive strength and modulus of elasticity of the concrete prepared with 100% recycled concrete aggregate was still lower than that of the control concrete. Over this period, the highest gain in compressive strength and modulus of elasticity was recorded for the concrete mixture prepared with 55% fly ash. Fly ash improved the resistance to chloride ion penetration but it also increased the carbonation depth of the concrete.read more
Citations
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Construction and demolition waste generation and properties of recycled aggregate concrete: A global perspective
Ali Akhtar,Ajit K. Sarmah +1 more
TL;DR: In this paper, the authors present the status of construction and demolition waste generation around the world and subsequently provide a critical review of the recent studies conducted to improve the properties of recycled aggregate concrete through different supplementary materials.
Journal ArticleDOI
Durability of recycled aggregate concrete – A review
Guo Hui,Caijun Shi,Guan Xuemao,Jianping Zhu,Yahong Ding,Tung-Chai Ling,Haibo Zhang,Wang Yuli +7 more
TL;DR: In this paper, the authors reviewed the previous findings on the effects of use of recycled aggregate on durability of concrete and found that the amount of adhered mortar and the quality of the original concrete have a significant effect on the properties of resulting concrete.
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A critical review and assessment for usage of recycled aggregate as sustainable construction material
TL;DR: In this paper, the authors provide an account of properties of concrete prepared with recycled aggregate, analyses the important findings on Recycled Aggregate Concrete (RAC) in the recent time and discusses the suitability of its usage in construction.
Journal ArticleDOI
Properties of recycled concrete aggregate and their influence in new concrete production
TL;DR: In this paper, the authors present a review of the potential and challenge of using recycled concrete aggregate (RCA) as the substitute for natural aggregate (NA) in concrete mixtures.
Journal ArticleDOI
Enhancing mechanical and durability properties of recycled aggregate concrete
TL;DR: In this paper, the effect of RCA to concrete and a treatment method utilized to improve the properties of the RCA by reducing the amount of the adhered mortar, and therefore improving the mechanical properties and durability of RAC.
References
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Journal ArticleDOI
Influence of moisture states of natural and recycled aggregates on the slump and compressive strength of concrete
TL;DR: In this article, the influence of moisture states of natural and recycled aggregates on the properties of fresh and hardened concretes was investigated, and the results suggested that an AD aggregate that contains not more than 50% recycled aggregate is optimum for producing normal strength recycled aggregate concrete.
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Performance of concrete made with commercially produced coarse recycled concrete aggregate
TL;DR: In this paper, performance tests have been carried out for fresh and hardened properties of concrete made with commercially produced coarse recycled concrete aggregate and natural fine sand, and the results indicate that the difference between the characteristics of fresh-and hardened recycled aggregate concrete and natural aggregate concrete is perhaps relatively narrow than reported for laboratory-crushed recycled aggregatecrete mixtures.
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Durability performance of concrete made with fine recycled concrete aggregates
Luís Evangelista,J. de Brito +1 more
TL;DR: In this paper, different concrete mixes with increasing rates of substitution of fine natural aggregates with fine recycled aggregates from crushed concrete were prepared and tested, and the results were then compared with those for a reference concrete with exactly the same composition and grading curve, but with no recycled aggregate, drawing some conclusions on the feasibility of using this type of aggregate in structural concrete.
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Recycled concrete aggregates
TL;DR: In this paper, a proposal for Greek specifications of recycled concrete aggregates (RCA) with reference to international experience and practice is presented, which will help Olympic Games 2004 to be as “green” as possible.
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Influence of Fly Ash as Cement Replacement on the Properties of Recycled Aggregate Concrete
TL;DR: The use of high percentages of recycled aggregates in concrete would usually worsen the concrete properties as discussed by the authors, and the use of fly ash as a substitute for natural aggregate is not beneficial.