盐碱溶液对混凝土抗冻性能的影响  

Influence of Saline-Alkaline Solution on Freezing Resistance of Concrete

作　　者：杨建森[1] 

机构地区：[1]宁夏大学土木与水利工程学院,宁夏银川750021

出　　处：《宁夏大学学报（自然科学版）》2006年第2期174-177,共4页Journal of Ningxia University(Natural Science Edition)

基　　金：宁夏自然科学基金资助项目(B002)

摘　　要：基于盐碱寒冷地区的工程环境与混凝土的配制特点,模拟配制了SA溶液,采用正交方案试验研究了SA溶液及水灰比、含气量和粉煤灰掺量3个参数对混凝土抗冻性能的影响.结果表明,由于产生渗透压和结晶压,盐碱溶液对混凝土的抗冻性能有严重的影响.水灰比为0.40的混凝土,置于SA溶液中的最大冻融次数比相应的置于水中的最大冻融次数平均减少22.5%;含气量对混凝土抗冻性能的影响最大,水灰比次之,粉煤灰掺量最小;随着含气量增加,最大冻融次数增大,当含气量从3.0%增大至6.0%时,最大冻融次数的增加幅度较小;随着水灰比和粉煤灰掺量的增大,最大冻融次数减小;孔结构是影响混凝土抗冻性能的最根本因素,优化孔结构是改善混凝土抗冻性能的核心技术措施.Based on the compounding characteristic of concrete in cold saline-alkaline area, imitating to compound SA solution as the test condition, orthogonal experiment was applied to study the influence of water-cement ratio, entrained air content and content of fly ash on the freezeing resistance of concrete. The results show that causing osmotic pressure and crystalline pressure, the saline-alkaline solution takes a great of influence on freezeing resistance of concrete, for example, the maximum number of freezeing-thaw cycle of concrete dipped in SA solution decreases 22.5% averagely when water-cement ratio is 0.4; the influence order of these three factors on freezeing resistance is entrained air content, water-cement ratio, content of fly ash; with entrained air content increasing, the freezeing resistance of concrete increases; with water-cement ratio and content of fly ash increasing, the freezeing resistance of concrete decreases; pore structure is the critical factor of affecting freezeing resistance of concrete, so improving pore structure is the key technology for improving the freezeing resistance of concrete.

关 键 词：盐碱溶液 混凝土 冻融循环 盐侵蚀 正交试验 

分 类 号：TU528.01[建筑科学—建筑技术科学]