再生骨料表面改性对水泥砂浆性能的影响

Effect of modified recycled fine aggregate on the performance of waterproof mortar

采用矿渣微粉、水玻璃对再生细骨料进行表面改性,研究了改性前后再生细骨料的物理性能及其对水泥砂浆性能的影响。结果表明:当采用20 wt%矿渣浆液、10 wt%水玻璃溶液对再生细骨料进行复合改性时效果最好。与未改性试样相比,改性再生细骨料的吸水率降低了23.6%,改性再生细骨料水泥砂浆(再生胶砂)其吸水率降低了35.5%,再生胶砂稠度值提高了27.1%,砂浆试样其28 d抗折、抗压强度分别提高了26.8%、25.3%,抗渗压力提高75%。利用扫描电子显微镜(SEM)对再生细骨料改性前后的微观形貌进行了观察,分析了其改性机理。

The recycled fine aggregate surface modification is carried out by slag powder, water glass. The physical properties of RFA before and after modification and the effect on the performance of cement mortar are studied.