摘要
为提高干混防水砂浆的物理、力学及耐久性能,通过正交试验研究聚羧酸粉体减水剂、有机硅憎水剂、可再生分散性乳胶粉与纤维素醚掺量4个因素对干混防水砂浆物理力学指标与耐久性的影响,对结果进行极差分析以得到最优配合比。通过XRD、SEM技术分析最优配比砂浆与不掺外加剂的基准砂浆的成分和微观结构,发现前者水化产物生成量较后者减少,但微观结构大幅改善。最优配比砂浆与基准砂浆相比,各项性能得到明显改善,保水率提高11.7%,稠度损失率下降7.4%,砂浆的抗折、抗压强度虽轻微下降,但14 d拉伸粘结强度大幅提高,达到278.3%,抗渗性能和收缩性能也显著提高。
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.
作者
吴进良
向兴隆
黄一凡
吴雅琪
王冠
彭德权
WU Jinliang;XIANG Xinglong;HUANG Yifan;WU Yaqi;WANG Guan;PENG Dequan(School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China;Chongqing Jiaoda Construction Engineering Quality Test Center Co.,Ltd.,Chongqing 400074,China;Chongqing Tongli Expressway Maintenance Engineering Co.,Ltd.,Chongqing 401147,China)
出处
《重庆理工大学学报（自然科学）》
北大核心
2023年第6期161-167,共7页
Journal of Chongqing University of Technology：Natural Science
基金
重庆交通大学交通土建工程材料国家地方联合工程实验室开放基金项目(LHSYS-2016-012)。
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
waterproof mortar
additive
physical property
mechanical property
durability
microstructure
