Mechanical properties of recycled aggregate concrete containing brick particles

IF 1.8 4区工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY

Magazine of Concrete Research Pub Date : 2024-05-10 DOI:10.1680/jmacr.23.00134

Yafei Zhang, Faning Dang, Xinzheng An

引用次数: 0

Abstract

To investigate the mechanical properties of recycled aggregate concrete containing brick particles(RACB), compressive strength tests were conducted on RACBs with different water cement ratios and recycled fine aggregate substitution rates. The changes in compressive strength, elastic modulus, and peak strain of RACB with recycled fine aggregate substitution rates were analyzed, and a stress–strain equation was established. A damage model was established using ultrasonic nondestructive testing technology to reveal the damage mechanism of RACB. Results show that the basic mechanical properties of RACB reach the best when the replacement rate of recycled fine aggregate (r) is 30%. The model parameter a of the stress–strain curve equation is consistent with the change rule of elastic modulus with r. The model parameter b has a quadratic function relationship with r, reflecting the brittleness of RACB. The initial damage of RACB is relatively large, and the cracks penetrate the recycled coarse aggregate, and lead to specimen failure.

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含砖颗粒的再生骨料混凝土的力学性能

为了研究含砖再生骨料混凝土（RACB）的力学性能，对不同水灰比和再生细骨料取代率的 RACB 进行了抗压强度试验。分析了 RACB 的抗压强度、弹性模量和峰值应变随再生细骨料替代率的变化，并建立了应力-应变方程。利用超声波无损检测技术建立了损伤模型，以揭示 RACB 的损伤机理。结果表明，当再生细骨料替代率（r）为 30% 时，RACB 的基本力学性能达到最佳。应力-应变曲线方程的模型参数 a 与弹性模量随 r 的变化规律一致，模型参数 b 与 r 呈二次函数关系，反映了 RACB 的脆性。RACB 的初始破坏相对较大，裂缝穿透再生粗集料，导致试样破坏。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Magazine of Concrete Research 工程技术-材料科学：综合

CiteScore

4.60

自引率

11.10%

发文量

102

审稿时长

5 months

期刊介绍： For concrete and other cementitious derivatives to be developed further, we need to understand the use of alternative hydraulically active materials used in combination with plain Portland Cement, sustainability and durability issues. Both fundamental and best practice issues need to be addressed. Magazine of Concrete Research covers every aspect of concrete manufacture and behaviour from performance and evaluation of constituent materials to mix design, testing, durability, structural analysis and composite construction.