高品质再生混凝土粗骨料物理性能试验研究

发布时间：2018-05-23 15:26

本文选题：再生粗骨料 + 高品质　；参考：《混凝土》2017年07期

【摘要】：利用微波辅助机械剔选技术对两个不同场地的废弃混凝土进行了剔选,得到再生粗骨料,然后从宏观和微观两方面对再生粗骨料和天然骨料的物理性能进行系统研究。结果表明:(1)在该工况下微波照射废弃混凝土试件所需要的单位质量照射时间大约在4.8~9.0 min/kg之间,而剔选率在31%~70%之间;(2)宏观物理试验表明微波辅助机械剔选出的再生粗骨料在吸水率、表观密度和质量损失方面与天然骨料基本相同,同比其他工艺,该技术剔选的再生粗骨料物理力学性能最优;(3)从微观角度借助电镜扫描进行试验,得出机械工艺对再生骨料的损伤程度较大,而微波辅助机械工艺剔选出来的再生粗骨料只在放大倍数为5 000的情况下出现微小裂纹,更接近天然粗骨料。总之,通过试验研究,验证了微波辅助机械剔选的再生粗骨料的高品质。
[Abstract]:The recycled coarse aggregate was obtained by using microwave-assisted mechanical weeding technique. The physical properties of recycled coarse aggregate and natural aggregate were systematically studied from macro and micro aspects. The results show that the irradiation time per unit mass required for microwave irradiation of waste concrete specimens under this condition is about 4.89.0 min/kg. Macroscopic physical tests show that the recycled coarse aggregate selected by microwave assisted mechanical picking is basically the same as natural aggregate in terms of water absorption, apparent density and mass loss, compared with other processes. The optimum physical and mechanical properties of recycled coarse aggregate selected by this technique are as follows: (1) from the microscopic point of view, scanning electron microscope (SEM) is used to test, and it is concluded that the degree of damage caused by mechanical process to recycled aggregate is great. However, the microwave-assisted mechanical process can only remove the regenerated coarse aggregate with a magnification of 5,000, which is closer to the natural coarse aggregate. In conclusion, the high quality of regenerated coarse aggregate was verified by microwave assisted mechanical selection.
【作者单位】：西安科技大学建筑与土木工程学院;
【基金】：国家自然科学基金资助(51174159)
【分类号】：TU528

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