基于粒形分析的再生细骨料颗粒特性和制备砂浆性能研究

Particle Characteristics of Recycled Fine Aggregate and Properties of Prepared Mortar Based on Particle Shape Analysis

运用数字图像技术分析再生细骨料的颗粒形貌参数,以此为基础对再生细骨料的堆积密度、吸水率、压碎值等颗粒特性开展研究,并对再生细骨料制备水泥砂浆的工作性能和力学性能进行了分析。实验结果表明,再生细骨料与同级配的标准砂和天然河砂相比,钝度、长宽比、坚固度和球度等指标均相对较低,压碎值和吸水率显著增加;使用再生细骨料制备水泥砂浆时,质量替代量达到30%时流动度明显下降,质量替代量达到40%时抗压强度和峰值应力显著下降。

Based on the analysis of the particle morphology parameters of recycled fine aggregate by the digital image technology, the particle characteristics such as bulk density, water absorption and crushing value of recycled fine aggregate were studied, and the workability and mechanical properties of cement prepared with the recycled fine aggregates were analyzed. The results show that compared with the standard sand and natural river sand at the same grade, the parameters such as dullness, aspect ratio, solidity and roundness of recycled fine aggregate are decreased, and the crushing value and water absorption are significantly increased. The fluidity of the prepared cement mortar with recycled fine aggregate decreases significantly when the mass substitution amount of recycled fine aggregate reaches 30%, and the compressive strength and peak stress decrease significantly when the mass substitution amount of recycled fine aggregate reaches 40%.