聚乙烯醇改性橡胶水泥基复合材料耐久性研究  

Durability of polyvinyl alcohol modified rubber cement-based composites

作　　者：杨友志 戚颖楠 李志鹏[1] 董必钦[2] YANG Youzhi;QI Yingnan;LI Zhipeng;DONG Biqin(School of Civil Engineering,Tianjin University,Tianjin 300350,P.R.China;Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering,Shenzhen University,Shenzhen 518060,Guangdong Province,P.R.China)

机构地区：[1]天津大学建筑工程学院,天津300350 [2]深圳大学广东省滨海土木工程耐久性重点实验室,广东深圳518060

出　　处：《深圳大学学报（理工版）》2023年第6期723-731,共9页Journal of Shenzhen University(Science and Engineering)

基　　金：国家自然科学基金资助项目(U2006223);天津市自然科学基金资助项目(21JCZDJC00410,22JCYBJC00620)。

摘　　要：为提升高寒地区混凝土坝的工作性能,通过毛细吸水试验、抗氯离子试验、冻融试验和碳化试验,研究聚乙烯醇(polyvinyl alcohol, PVA)改性废弃橡胶对水泥基复合材料耐久性能的影响,分析体积分数为0~30%的橡胶颗粒经质量分数为0.1%的PVA溶液改性前后水泥基复合材料耐久性的变化.结果显示,当橡胶体积分数增加到10%时,水泥基复合材料的毛细吸水性、抗氯离子渗透性、抗冻融能力以及抗碳化性能均得到了提升;加入PVA后,橡胶颗粒与水泥基体之间的黏结性增强,特别是橡胶体积分数为10%时,累计孔隙体积降低了28.8%,进一步提高了橡胶水泥基复合材料的耐久性能.研究可为橡胶混凝土在工程实际中的进一步应用提供新思路.To enhance the service performance of concrete dams in alpine regions,the effects of polyvinyl alcohol(PVA)modified waste rubber on the durability of cement-based composites were analyzed by the capillary absorption test,chloride ion resistance test,freeze-thaw test,and carbonation test.The effects of rubber particles with a volume fraction of 0-30%on the durability of cement-based composites were systematically evaluated before and after modifications by PVA solution with a mass fraction of 0.1%.The results showed that,when the volume fraction of rubber increases to 10%,the capillary water absorption,chloride ion penetration resistance,freeze-thaw resistance,and carbonization resistance of cement-based composites are all improved.After adding PVA,the adhesion between rubber particles and cement matrix is enhanced,especially when the integral number of rubber body is 10%,the cumulative pore volume decreases by 28.8%,further improving the durability of rubber cement based composite materials.Research can provide new ideas for the further application of rubber concrete in engineering practice.

关 键 词：复合材料 聚乙烯醇 毛细吸水 氯离子渗透 碳化性能 耐久性能 

分 类 号：TU525.9[建筑科学—建筑技术科学]