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Evaluation of coarse recycled concrete aggregates effect on the properties of fresh and hardened concrete

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Asian Journal of Civil Engineering Aims and scope Submit manuscript

Abstract

This study presented is interested to identify the influence of the use of recycled concrete aggregates (RCA) on mechanical properties (compressive strength, tensile and Modulus of elasticity), rheological properties (workability, yield stress, and plastic viscosity), and total shrinkage of concrete. Coarse ordinary aggregates (COA) are partially substituted with RCA and an amount of superplasticizer has been added to keep the same workability. The results obtained indicate a positive effect of the recycled aggregates on the mechanical strengths. This effect is closely linked to the w/c ratio, the dosage of superplasticizer, and the percentage of substitution. Concrete mixtures with RCA record the highest values of rheological properties and large values of total shrinkage which depends on the w/c ratio. Correlations and mathematical relationships are proposed to express the variation in mechanical properties and those of total shrinkage as a function of the concrete composition.

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Acknowledgements

This work was carried out with the contribution of the Ministry of Higher Education and of the Scientific Research of Algeria under the subsidies of the PRFU project.

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Correspondence to Adem Ait Mohamed Amer.

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Ait Mohamed Amer, A., Ezziane, K. & Adjoudj, M. Evaluation of coarse recycled concrete aggregates effect on the properties of fresh and hardened concrete. Asian J Civ Eng 22, 1173–1184 (2021). https://doi.org/10.1007/s42107-021-00373-0

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  • DOI: https://doi.org/10.1007/s42107-021-00373-0

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