Effect of Chemical Enhancing-Technology on the Properties of Recycled Aggregate
Effect of Chemical Enhancing-Technology on the Properties of Recycled Aggregate
复制标题
化学强化技术对再生骨料性能的影响
DOI：
10.1155/2020/8875348
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发表时间：
2020-07
影响因子：
1.8
通讯作者：
Li Jing
中科院分区：
文献类型：
--
作者：
Li Ping;Zhang Dongmei;Wei Di;Xiong Jianping;Li Jing
用再生骨料加固附着的旧水泥砂浆是提高再生骨料性能的一种常用方法。本研究选取了四种具有代表性的化学强化技术。通过物理性能、力学性能和形状指标的分析，测试加固前后性能的变化，以掌握化学增强技术对RA性能的影响。结果表明，化学加固方法对RA的密度、吸水率等物理性能有明显影响。由于化学强化的机理不同，影响的趋势和幅度也不同。经过化学强化处理后，RA的压裂值、磨损值等力学性能明显提高。但是，化学强化对RA的形状有一定的影响，使其棱角指数和球度指数略有降低。添加C-3和C-7的RA的质构指数急剧下降，但磨耗后质构指数升高，不同增强方法的集料质构指数差异显著减小。微观分析表明，C-3和H的集合体表面结构较大，而C-7和N-P的集合体表面有大量的精细结构。不同的化学强化方法对RA的力学性能和微观结构有不同的影响，但需要注意的是RA性能的波动性有增大的趋势。
Strengthening the attached old cement mortar of recycled aggregate (RA) is a common approach to enhance the RA properties. In this study, four representative chemical enhancing-technologies were chosen. Through the analysis of physical properties, mechanical properties, and shape indexes, the changes of performance before and after strengthening were tested, so as to grasp the influence of chemical enhancing-technologies on the performance of RA. The results indicated that the chemical strengthening methods had obvious influence on the physical properties of RA, such as density and water absorption. Due to the different chemical enhancing mechanism, the influence trend and range were varied. The mechanical properties of RA such as crushing value and abrasion value were obviously improved by chemical enhancement. However, chemical enhancement had an effect on the shape of RA, which will slightly reduce the angularity index and sphericity index. The texture index of RA with C-3 and C-7 decreased sharply, but texture index increased after abrasion, and the discrepancy of aggregate texture index of different enhancing methods is significantly reduced. The microanalysis exhibited that the aggregate surface structure with C-3 and H was large, but there were a lot of fine structures on the aggregate surface with C-7 and N-P. Different chemical enhancing methods have different effects on the mechanical performance and microstructure of RA, but it should be noted that the fluctuation of RA performance tends to increase.
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影响因子：
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P. Ekins
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