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Article

Mechanical Properties of Concrete with Recycled Concrete Aggregate and Fly Ash

Engineering Management Department, Prince Sultan University, Riyadh 11586, Saudi Arabia
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Author to whom correspondence should be addressed.
Academic Editors: Mizi Fan, Domenico Asprone and José Neves
Received: 3 January 2021 / Revised: 22 February 2021 / Accepted: 21 March 2021 / Published: 1 April 2021
Recycled concrete aggregate (RCA) collected from the demolition of old reinforced concrete structures can be reused to prepare structural and non-structural concrete, thereby protecting the environment by preserving natural resources. This study explores RCA’s use, collected from the crushed concrete of different building projects in Riyadh, to manufacture fresh self-compacting concrete (SCC) and investigate its properties in the fresh and hardened state. Four SCC mixes were prepared by replacing natural aggregate (NA) with RCA at 0%, 25%, 50%, and 75% replacement levels. The water-cement (w/c) ratio was maintained constant at 0.38 for all the mixes. Slump Flow, J-ring, and V-funnel tests were performed on the SCC mixes in the fresh state, and the compressive strength of hardened concrete was determined after seven, 14, and 28 days. Water absorption and split tensile tests were also carried out for all the mixes. The findings revealed that it is possible to reach compressive strengths higher than 40 MPa at 28 days for RCA replacement level of 75% by using a superplasticizer and low w/c ratio. The decrease in compressive strength concerning the SCC-NA mix was 25% for 75% replacement level. The highest split tensile strength at 28 days was around 3.3 MPa for a 50% replacement level. The lowest water absorption was 3.2% for SCC-NA, which was gradually increased and was highest at 5.6% for 75% replacement level. View Full-Text
Keywords: recycling; self-compacting concrete (SCC); high-performance concrete (HPC); recycled concrete aggregate (RCA); natural aggregate (NA) recycling; self-compacting concrete (SCC); high-performance concrete (HPC); recycled concrete aggregate (RCA); natural aggregate (NA)
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MDPI and ACS Style

Katar, I.; Ibrahim, Y.; Abdul Malik, M.; Khahro, S.H. Mechanical Properties of Concrete with Recycled Concrete Aggregate and Fly Ash. Recycling 2021, 6, 23. https://0-doi-org.brum.beds.ac.uk/10.3390/recycling6020023

AMA Style

Katar I, Ibrahim Y, Abdul Malik M, Khahro SH. Mechanical Properties of Concrete with Recycled Concrete Aggregate and Fly Ash. Recycling. 2021; 6(2):23. https://0-doi-org.brum.beds.ac.uk/10.3390/recycling6020023

Chicago/Turabian Style

Katar, Ihab, Yasser Ibrahim, Mohammad Abdul Malik, and Shabir H. Khahro 2021. "Mechanical Properties of Concrete with Recycled Concrete Aggregate and Fly Ash" Recycling 6, no. 2: 23. https://0-doi-org.brum.beds.ac.uk/10.3390/recycling6020023

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