关键词: 防水砂浆, 外加剂, 物理性能, 力学性能, 耐久性能, 微观结构

Abstract: In order to improve physical,mechanical and durability properties of dry-mixed waterproof mortar,this paper studies the effects of polycarboxylate superplasticizer,silicone hydrophobic agent,renewable dispersive latex powder and cellulose ether on the physical and mechanical indexes and durability of dry-mixed waterproof mortar through orthogonal tests.Then,range analysis is performed on the results to obtain the optimal mix proportion.XRD and SEM techniques are used to analyze the composition and microstructure of both the mortar with the best mix proportion and the mortar of the reference group without admixture.The results show that the hydration products generated by the former are less than those by the latter,but the microstructure is greatly improved.Compared with those of the mortar of the reference group,all properties of the mortar with the best mix proportion are significantly improved,the water-retention rate increases by 11.7%,and the consistency loss rate reduces by 7.4%.Although the flexural and compressive strength of the mortar slightly reduces,the 14 d tensile bond strength significantly increases to 278.3%,and the impermeability and shrinkage properties are also significantly improved.