Effect of Mixed Recycled Aggregate on the Mechanical Strength and Microstructure of Concrete under Different Water Cement Ratios

Mixed recycled aggregate (MRA) is a kind of recycled aggregate containing discarded bricks and other impurities that is inferior to ordinary recycled concrete aggregate. To study the effect of MRA in concrete, specimens with 100% MRA under different water–cement ratios (W/C) of 0.50, 0.42, 0.36 and...

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Veröffentlicht in:Materials 2021-05, Vol.14 (10), p.2631
Hauptverfasser: Meng, Tao, Wei, Huadong, Yang, Xiufen, Zhang, Bo, Zhang, Yuncai, Zhang, Cungui
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container_issue 10
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container_title Materials
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creator Meng, Tao
Wei, Huadong
Yang, Xiufen
Zhang, Bo
Zhang, Yuncai
Zhang, Cungui
description Mixed recycled aggregate (MRA) is a kind of recycled aggregate containing discarded bricks and other impurities that is inferior to ordinary recycled concrete aggregate. To study the effect of MRA in concrete, specimens with 100% MRA under different water–cement ratios (W/C) of 0.50, 0.42, 0.36 and 0.30 were prepared, and the mechanical properties and microstructure were tested. Results show that compared with ordinary concrete, the compressive strength of mixed recycled aggregate concrete (MRAC) with the same W/C was reduced by more than 50% at 28 days, but the axial compression ratio was relatively high, reaching over 0.87. Affected by the high water absorption of MRA, the hydration rate of cement slowed, which was beneficial to the long-term development of the properties of MRAC. An appropriate increase in cement content could strengthen MRA and densify the pore structure of MRAC. The research results of this article prove that MRA has high utilization value and could be used to prepare MRAC with application potential using optimal gradation, which is of positive significance for promoting the consumption of construction waste.
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subjects Axial compression
Cement
Compression ratio
Compressive strength
Concrete aggregates
Concrete construction
Concrete mixing
Construction materials
Mechanical properties
Microstructure
Particle size
Porous materials
Tensile strength
Water absorption
Water-cement ratio
title Effect of Mixed Recycled Aggregate on the Mechanical Strength and Microstructure of Concrete under Different Water Cement Ratios
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