评估再生混凝土骨料粒度和浓度对高强度可持续混凝土性能的影响

Q1 Chemical Engineering
Md. Habibur Rahman Sobuz , Shuvo Dip Datta , Abu Sayed Mohammad Akid , Vivian W.Y. Tam , Shoaib Islam , Md. Jewel Rana , Farhad Aslani , Çağlar Yalçınkaya , Norsuzailina Mohamed Sutan
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引用次数: 0

摘要

本文研究了掺入不同大小和浓度的再生混凝土骨料(RCA)的高强度混凝土(HSC)的新拌和力学性能。测试了再生骨料混凝土(RAC)的新拌混凝土性能,如坍落度、凯利球、压实系数、K-坍落度和新拌密度,以确定 RCA 大小和浓度的影响。此外,还通过抗压、劈裂-拉伸和应力-应变试验对力学性能进行了研究。试验结果表明,增加 RCA 浓度会降低 HSC 的新拌和硬化性能。在新拌混凝土实验中,12-20 毫米骨料大小的 RAC 混合物比 5-12 毫米骨料的混合物表现出更大的可加工性。相反,与 12-20 毫米骨料混合混凝土相比,5-12 毫米骨料 RAC 混合物的抗压强度和劈裂拉伸强度更高,弹性模量也更大。在可持续发展方面,研究发现,较小粒径范围的 RAC 产生的二氧化碳(eCO2)较少,为建筑行业提供了一种具有成本效益和可持续发展的解决方案。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Evaluating the effects of recycled concrete aggregate size and concentration on properties of high-strength sustainable concrete

This paper studies the fresh and mechanical properties of high-strength concrete (HSC) by incorporating recycled concrete aggregates (RCA) of varying sizes and concentrations. The recycled aggregate concrete (RAC) was prepared by partially replacing RCA with natural coarse aggregate (NCA) at 0%, 15%, 30%, and 45%, with aggregate sizes ranging from 5 to 12 and 12–20-mm. Fresh concrete properties, such as slump, Kelly ball, compacting factor, K-slump, and fresh density, were tested to determine the influence of RCA size and concentration. In addition, the mechanical properties were studied through the execution of compressive, split-tensile, and stress-strain tests. The test results revealed that increasing the RCA concentration declines the fresh and hardened properties of HSC. In the fresh concrete experimentation, the 12–20 mm aggregate size RAC mixes exhibited greater workability than the 5–12 mm aggregate mixes. On the contrary, 5–12 mm aggregate mixes RAC had higher compressive and split-tensile strength and a higher modulus of elasticity than 12–20 mm aggregate mixes concrete. When it comes to sustainability, the study found that the smaller size range of RAC produces inferior embodied CO2 (eCO2) and provides a cost-effective and sustainable solution for the construction industry.

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来源期刊
Journal of King Saud University, Engineering Sciences
Journal of King Saud University, Engineering Sciences Chemical Engineering-Fluid Flow and Transfer Processes
CiteScore
12.10
自引率
0.00%
发文量
87
审稿时长
63 days
期刊介绍: Journal of King Saud University - Engineering Sciences (JKSUES) is a peer-reviewed journal published quarterly. It is hosted and published by Elsevier B.V. on behalf of King Saud University. JKSUES is devoted to a wide range of sub-fields in the Engineering Sciences and JKSUES welcome articles of interdisciplinary nature.
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