再生砂制备干混砌筑砂浆的试验研究

Experimental research on preparation of dry-mixing masonry mortar with recycled sand

采用再生砂作为砂浆组成材料中的细骨料,掺入一定量的粉煤灰替代水泥制备干混砌筑砂浆,系统研究了粉煤灰掺量及胶砂比对其基本性能和力学性能的影响。结果表明,干混砌筑砂浆的分层度、表观密度和含气量与粉煤灰掺量及胶砂比均呈线性关系,并且其抗压强度随着胶砂比的减小而逐渐降低;当胶砂比为1∶3,且粉煤灰掺量为10%时,其后期抗压强度达到最高,相比早期增大幅度达65.9%;最后,根据再生骨料干混砌筑砂浆抗压强度与粉煤灰掺量的关系曲线回归拟合出不同胶砂比条件下砂浆的抗压强度公式,以制备M10~M30不同强度等级的干混砌筑砂浆。

The recycled sand was adopted as the fine aggregate of mortar and a certain amount of pulverized fly ash was used to replace cement to prepare dry-mixing masonry mortar, and the influences of the content of fly ash and binder-sand ratio on its basic performance and mechanical properties were studied systematically. The results show that, there is a linear relationship between the basic performances of dry-mixing masonry mortar such as layering de- gree, apparent density, air content and the content of fly ash and binder-sand ratio, and its compressive strength de- creases gradually with the decrease of the binder-sand ratio; When the binder-sand ratio is 1 ： 3 and the dosage of fly ash is 10% ,the later compressive strength of dry-mixing masonry mortar reaches the maximum,and the strength has increased by 65.9% compared with the early compressive strength. At last, according to regression curve of the rela- tion between the compressive strength of the dry-mixing masonry mortar of recycled aggregate with the content of fly ash, the formula of the compressive strength of mortar in different binder-sand ratio is fitted out to prepare the dry mixing masonry mortar with different strength grade of M10 - M30.