Static and Dynamic Mechanical Properties of Recycled Concrete under Microwave Irradiation

IF 3.4 4区 化学 Q2 POLYMER SCIENCE International Journal of Polymer Science Pub Date : 2022-11-14 DOI:10.1155/2022/1685064
D. Shi, Q. Shi, Lei Yang
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Abstract

The application of recycled concrete can alleviate environmental pollution and has great practical value. In this study, microwave irradiation technology is used to treat recycled concrete in order to obtain reinforced recycled coarse aggregate. Then, the quasi-static and dynamic mechanical properties of concrete (C), recycled concrete (RC), and recycled concrete irradiated by microwave (MRC) were studied, and the effect of the replacement rate of coarse aggregates on its mechanical properties was also studied. The results showed that the quasi-static compressive strength of MCR is higher than that of CR at all replacement rates. With the increase in the replacement rate, the quasi-static compressive strength of MCR decreases gradually, while the quasi-static compressive strength of CR decreases first and then increases, reaching the minimum value at 60%. The dynamic mechanical properties of CR and MCR all have an obvious strain rate effect. The dynamic increase factor (DIF) has an exponential relationship with the natural logarithm of the strain rate. The dynamic constitutive model of RC was established based on composite material mechanics and viscoelastic theory. The research content can provide guidance and basis for the study of mechanical properties and constitutive relationship of RC.
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微波辐照下再生混凝土的静、动态力学性能
再生混凝土的应用可以减轻环境污染,具有很大的实用价值。本研究采用微波辐照技术对再生混凝土进行处理,以获得增强再生粗骨料。然后,研究了微波辐照混凝土(C)、再生混凝土(RC)和再生混凝土(MRC)的准静态和动态力学性能,并研究了粗集料替代率对其力学性能的影响。结果表明,在各种替换率下,MCR的准静态抗压强度均高于CR。随着替代率的增加,MCR的准静态抗压强度逐渐降低,而CR的准静态抗压强度先减小后增大,在60%时达到最小值。CR和MCR的动态力学性能均有明显的应变速率效应。动态增加因子(DIF)与应变速率的自然对数呈指数关系。基于复合材料力学和粘弹性理论,建立了钢筋混凝土的动力本构模型。研究内容可为钢筋混凝土力学性能及本构关系的研究提供指导和依据。
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来源期刊
CiteScore
6.10
自引率
0.00%
发文量
55
审稿时长
>12 weeks
期刊介绍: The International Journal of Polymer Science is a peer-reviewed, Open Access journal that publishes original research articles as well as review articles on the chemistry and physics of macromolecules.
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