超疏水改性水泥基材料设计及性能研究  

Study on design and performance of superhydrophobic modified cement-based materials

作　　者：周剑波 叶群山[1] 郭厚青 ZHOU Jianbo;YE Qunshan;GUO Houqing(School of Traffic&Transportation Engineering,Changsha University of Science&Technology,Changsha 410114,China)

机构地区：[1]长沙理工大学交通运输工程学院,湖南长沙410114

出　　处：《长沙理工大学学报（自然科学版）》2024年第4期176-187,共12页Journal of Changsha University of Science & Technology:Natural Science

基　　金：湖南省教育厅科学研究重点项目(20A012);长沙市科技计划项目(kq2014107);长沙理工大学研究生科研创新项目(CX2021SS10)。

摘　　要：【目的】研究纳米二氧化硅和硅氧烷对水泥基材料的超疏水改性效果及其性能影响。【方法】以水泥材料为主体,通过正交试验方法优选改性材料十二烷基三甲氧基硅烷(dodecyltrimethoxysilane,DTES)、纳米二氧化硅(nano-silica,NS)和聚羧酸高效减水剂(polycarboxylate superplasticizer,PCE)的最佳配比,并采用强度试验、水化热测试、水接触角测量和毛细吸水试验评估改性材料对水泥力学性能和疏水性能的作用。【结果】DTES、NS和PCE的最佳质量分数分别为3.00%、1.80%和0.25%;改性水泥试样表面的水接触角高达152.50°,毛细吸水系数降低91%以上,3 d抗折强度、28 d抗压强度分别下降19%、12%。【结论】改性材料的协同作用使水泥基材料表面达到超疏水状态,同时具备良好的抗水渗透性能,其中DTES影响水泥强度,NS对抗压强度和后期抗折强度起增强作用。[Purposes]This paper aims to study the effects of nano-silica(NS)and siloxane on the superhydrophobic modifications and properties of cement-based materials.[Methods]The best ratios of modified materials,including dodecyltrimethoxysilane(DTES),NS,and polycarboxylate superplasticizer(PCE)for cement-based materials,were selected by the orthogonal test method.The strength tests,the heat of hydration tests,the contact angle measurements,and the capillary water absorption tests were conducted to evaluate the effects of the modified materials on the mechanical and hydrophobic properties of the cement.[Findings]The best mass mixing ratios of DTES,NS,and PCE are 3.00%,1.80%,and 0.25%,respectively.The water contact angle on the surface of the modified cement specimen is up to 152.50°.The capillary water absorption coefficient is reduced by more than 91%,and the flexural strength after 3 d and the compressive strength after 28 d are reduced by 19%and 12%,respectively.[Conclusions]The combined effect of the modified materials results on the surface of cement-based materials is superhydrophobic and of excellent resistance to water penetrations.The strength of cement is affected by DTES,while the compressive strength and the later flexural strength are enhanced by NS.

关 键 词：超疏水 纳米二氧化硅 水泥基材料 正交试验 力学性能 

分 类 号：TU528[建筑科学—建筑技术科学]