附加用水量对再生砂混凝土工作性和力学性能的影响

doi:10.11896/cldb.22070217

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Abstract The replacement ratio of recycled fine aggregate (RFA) and amount of additional water have significant impact on the performance of both fresh and hardened recycled concrete. 16 groups of concrete specimens were prepared with different RFA replacement ratios (γ_RFA) of 30%, 50%, 70%, and 100% and compensation factors of additional water consumption (k_wa) of 0.6, 0.75, 0.9, and 1.0, and the workability (slump, slump flow and flow time) and mechanical properties (compressive strength, flexural strength and modulus of elasticity) of these RFA concretes were tested. According to the test results, the influence law of the above k_waand γ_RFA parameters on the properties of the RFA concretes was discussed, and a reasonable k_wa values range was obtained. The results show that the workability of RFA concrete decreases and the mechanical properties increase as k_wa decreases;the influence of γ_RFAon the mechanical properties of the RFA concrete are related to the additional water consumption. Under the conditions of low and medium additional water consumption (k_wa=0.6, 0.75), some mechanical properties of RFA concrete increase with the increase of γ_RFAand their values are higher than those of natural sand concrete. Under the conditions of high additional water consumption (k_wa=0.9, 1.0), the mechanical properties of RFA concrete decrease linearly with the increase of γ_RFA. The γ_RFA less than 50% has little effect on the mechanical properties of RFA concrete, and the workability and mechanical properties of RFA concrete are little affected by the variation of γ_RFA value ranged from 0.75 to 0.9.

Key words： recycled concrete recycled fine aggregate amount of additional water workability mechanical property

Published: Online: 2024-01-16

CLC number:

TU528.01

Fund:National Key Research and Development Program of China (2020YFC1909904).

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	Articles by authors
	LI Beixing
	CHEN Pengbo
	YIN Shi
	YI Hao

Cite this article:

LI Beixing,CHEN Pengbo,YIN Shi, et al. Effect of Additional Water Amount on the Workability and Mechanical Properties of Concrete with Recycled Fine Aggregates[J]. Materials Reports, 2024, 38(1): 22070217-7.

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http://www.mater-rep.com/EN/10.11896/cldb.22070217 OR http://www.mater-rep.com/EN/Y2024/V38/I1/22070217

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