母体混凝土强度对再生混凝土性能的影响

IF 1.2 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY
B. Kebaili, M. Benzerara, Souad Menadi, Nadia Kouider, R. Belouettar
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引用次数: 3

摘要

将混凝土废料作为二次骨料再利用可能是可持续发展和长期环境保护的有效解决方案。然而,废弃混凝土的质量参差不齐,尤其是抗压强度不同的混凝土,会对再生混凝土的最终抗压强度产生负面影响。在这种方法中,本研究的主要目标是研究母体混凝土质量对再生混凝土性能的影响。为了完成这项任务,在实验测试程序中分析了三种不同抗压强度等级(10至15)MPa、(20至25)MPa和(30至40)MPa,其中还引入了未知的抗压强度。试验混合物使用40%的二次骨料(包括粗骨料和细骨料)和60%的天然骨料。这导致试验混凝土的抗压强度与正常混凝土相比降低了14%至23.7%。通过添加相当于所用再生骨料重量4%的水泥量来改善这种损失。研究结果表明,母体混凝土的强度特性对再生混凝土抗压强度的影响有限。此外,低抗压强度的母体混凝土在压碎时会产生大量细骨料和大量再生粗骨料,砂浆附着较少,并表现出与优秀母体混凝土相同的抗压强度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effect of parent concrete strength on recycled concrete performance
The reuse of concrete waste as a secondary aggregate could be an efficient solution for sustainable development and long-term environmental protection. However, the variable quality of waste concrete, especially with various compressive strengths, can have a negative effect on the final compressive strength of recycled concrete. In this approach, the major goal of this research is to study the effect of parent concrete qualities on the performance of recycled concrete. To accomplish this task, three grades of different compressive strengths (10 to 15) MPa, (20 to 25) MPa, and (30 to 40) MPa have been analyzed in an experimental test program, in which an unknown compressive strength is introduced as well. The experimental mix use 40% of secondary aggregates (both course and fine) and 60% of natural aggregates. This led to the decreasing of the compressive strength of the test concrete between 14% and 23.7% compared to the normal concrete. This loss was improved by adding an amount of cement equivalent to 4% of the weight of the recycled aggregate used. The achieved results prove that the strength properties of the parent concrete have a limited effect on the compressive strength of the recycled concrete. Additionally, low compressive strength parent concrete, when crushed, generates a high amount of fine aggregate and large percentage of recycled coarse aggregates with less attached mortar, and presents the same compressive strength as an excellent parent concrete.
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来源期刊
Frattura ed Integrita Strutturale
Frattura ed Integrita Strutturale Engineering-Mechanical Engineering
CiteScore
3.40
自引率
0.00%
发文量
114
审稿时长
6 weeks
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