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Durability Performance of SCC and SCGC Containing Recycled Concrete Aggregates: A Comparative Study

Author

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  • Tehmina Ayub

    (Department of Civil Engineering, NED University of Engineering and Technology, Karachi 75270, Pakistan)

  • Wajeeha Mahmood

    (Department of Civil Engineering, NED University of Engineering and Technology, Karachi 75270, Pakistan)

  • Asad-ur-Rehman Khan

    (Department of Civil Engineering, NED University of Engineering and Technology, Karachi 75270, Pakistan)

Abstract

This study assesses the behaviour of self-compacting geopolymer concrete (SCGC) with and without recycled concrete aggregates (RCA) by studying the rheological, mechanical and durability properties and comparison with self-compacting concrete (SCC). The idea of using RCA in geopolymer is to attain sustainable development goals, i.e., with less carbon footprint and the use of waste materials such as fly ash and RCA. Two types of concretes were prepared, namely “self-compacting concrete (SCC)” and “self-compacting geopolymer concrete (SCGC)”. Using each concrete type, two design mixes were prepared. The first mix contained 100% natural coarse aggregates (NCA), whereas, in the second mix, 30% NCA were replaced with RCA. The result of rheological properties indicated that the viscosity, passing ability, and segregation results of SCC and SCGC mixes were higher when NCA was partially replaced with RCA. Results of mechanical properties indicated that the increase in the compressive strength of the control mix of SCC (denoted as SCC-0) and SCGC mix (denoted as SCGC-0) at 28 days was 38.3% and 33.1% higher than those containing 30% RCA (denoted as SCC-30 and SCGC-30), respectively. The percentage increase in the compressive strength of SCC-0 and SCC-30 mixes was 20.24% and 13.45% higher compared to SCGC-0 and SCGC-30 mixes. The increase in the split tensile strength of SCC-0 and SCC-30 mixes was 9% and 21.74% higher than SCGC-0 and SCGC-30 mixes. The split tensile strength of control mixes SCC-0 and SCGC-0 is 47.73% and 55% higher than SCC-30 and SCGC-30 at 28 days, respectively. Durability performance of SCC and SCGC mixes was investigated by performing hydraulic permeability, accelerated carbonation, half-cell potential and pull-out tests at 28, 90, 180, 365, and 720 days, and were found inferior for SCGC mixes. The water penetration depth of SCGC-0 and SCGC-30 mixes was 5.71% to 16.1% and 10% to 18.6% higher than SCC-0 and SCC-30 mixes at 28 to 720 days. The carbonation depth in SCGC-0 and SCGC-30 mixes was 8.11% to 20.83% and 7.89% to 13.73% higher than SCC-0 and SCC-30 mixes at 28 to 720 days. The half-cell potential difference results for SCGC-0 and SCGC-30 mixes were 27.5% to 50% and 8.3% to 16.41% higher than SCC-0 and SCC-30 mixes at 28 to 720 days. The pull-out strength of SCC-0 and SCC-30 mixes was 11.36% to 29.5% and 8.3% to 38.97% higher than SCGC-0 and SCGC-30 mixes at 28 to 720 days, respectively. Overall, the mechanical and durability properties of SCC mixes were better than SCGC at the same exposure period.

Suggested Citation

  • Tehmina Ayub & Wajeeha Mahmood & Asad-ur-Rehman Khan, 2021. "Durability Performance of SCC and SCGC Containing Recycled Concrete Aggregates: A Comparative Study," Sustainability, MDPI, vol. 13(15), pages 1-21, August.
    • Handle: RePEc:gam:jsusta:v:13:y:2021:i:15:p:8621-:d:607092
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    References listed on IDEAS

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    1. Ali Naqi & Jeong Gook Jang, 2019. "Recent Progress in Green Cement Technology Utilizing Low-Carbon Emission Fuels and Raw Materials: A Review," Sustainability, MDPI, vol. 11(2), pages 1-18, January.
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    1. Shirong Yan & Binglei Wang & Yu Sun & Boning Lyu, 2021. "Micromechanics-Based Prediction Models and Experimental Validation on Elastic Modulus of Recycled Aggregate Concrete," Sustainability, MDPI, vol. 13(20), pages 1-13, October.

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