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对比研究了减缩剂内掺和外涂对砂浆收缩、抗裂及力学性能的影响。结果表明:减缩剂外涂对砂浆试件有比较明显的减缩效果;减缩剂外涂的溶液浓度越高,减缩效果越好,适宜浓度为50%;相比内掺,减缩剂外涂可提高砂浆的抗折强度和抗压强度,提高砂浆抗裂性能,开裂面积下降了35%;减缩剂外涂增加水泥石中C–S–H凝胶及钙矾石的生成量,减少了水泥石中20～50nm毛细孔的数量。
The effects of internal and external shrinkage inhibitors on the shrinkage, crack resistance and mechanical properties of mortar were compared. The results show that the shrinkage reducing agent has obvious shrinkage reducing effect on the mortar specimen. The higher the solution concentration of the shrinkage reducing agent is, the better shrinking effect is, and the suitable concentration is 50%. Compared with the internal mixing, the shrinkage reducing agent can improve the mortar Of the flexural strength and compressive strength and improve mortar cracking resistance, cracking area decreased by 35%; shrinkage reducing agent coated with cement to increase C-S-H gel and ettringite formation, reducing the cement stone 20 ~ 50nm The number of pores.