低温和干湿循环双重环境下水泥砂浆抗硫酸盐侵蚀试验研究%  

Sulfate Corrosion Resistance of Cement Mortar under Low Temperature and Dry-Wet Cycles

作　　者：谢松林[1] 王起才[1] 代金鹏[1] 王云天[1] 郭玉柱[1] 余小龙 XIE Song-lin;WANG Qi-cai;DAI Jin-peng;WANG Yun-tian;GUO Yu-zhu;YU Xiao-long(National and Provincial Joint Engineering Laboratory of Road & Bridge Disaster Prevention and Control,Lanzhou Jiaotong University,Lanzhou730070,China;Gansu Provincial Planning,Survey & DesignInstitute of Communications Co.,Ltd.,Lanzhou730000,China)

机构地区：[1]兰州交通大学道桥工程灾害防治技术国家地方联合工程实验室,兰州730070 [2]甘肃省交通规划勘察设计院股份有限公司,兰州730000

出　　处：《长江科学院院报》2019年第2期122-126,共5页Journal of Changjiang River Scientific Research Institute

基　　金：长江学者和创新团队发展计划滚动支持项目(IRT_15R29);中国交建2016年创新平台建设应用基础研究项目(2016-ZJKJ-PTJS04);兰州交通大学青年科学基金项目(2017015)

摘　　要：结合我国西北地区实际情况,对低温、干湿循环双重环境下水泥砂浆抗硫酸盐侵蚀性能进行了试验研究。试验采用0.5和0.36两种水灰比,胶凝材料采用普通硅酸盐水泥、中抗硫酸盐硅酸盐水泥和在普通硅酸盐水泥中分别掺入15%矿粉+1%硅灰和15%矿粉+3%硅灰4种方案。结果表明:在低温、干湿循环双重环境作用下,化学侵蚀非常缓慢,砂浆的劣化主要是硫酸钠结晶导致的;降低水灰比能显著提高水泥砂浆抵抗硫酸盐侵蚀的性能;使用抗硫酸盐硅酸盐水泥能在一定程度上改善抗侵蚀性能;不同水灰比下,复掺矿粉和硅灰会表现出不同的效果,在低水灰比情况下能提高抗侵蚀性能,在高水灰比下反而会降低抗侵蚀性能。研究结果可为低温和干湿循环双重环境下的工程建设提供参考。In view of the actual situation in northwest China,we examined the sulfate corrosion resistance of cement mortar under the combined action of low temperature and dry-wet cycles.We determined 0.50 and 0.36 as the water-cement ratio of test cement mortar specimens;at each water-cement ratio,we prepared four groups of mortar specimens with different binding materials:ordinary Portland cement,medium anti-sulfate Portland cement,ordinary Portland cement dosed with 15%slag and 1%silica fume,and ordinary Portland cement dosed with 15%slag and 3%silica fume.The results are concluded as follows:under the combined action of low temperature and dry-wet cycles,the degradation of cement mortar is mainly induced by the crystallization of sodium sulfate,with very slow chemical corrosion.Cutting the water-cement ratio could remarkably improve the performance of cement mortar against sulfate attack.Anti-sulfate Portland cement could enhance the corrosion resistance to a certain extent.Moreover,adding slag and silica fume would ameliorate the corrosion resistance of mortar with low water-cement ratio,and vise versa.The results offer reference for constructions in the regions under combined action of low temperature and dry-wet cycles.

关 键 词：水泥砂浆 低温 干湿循环 硫酸盐侵蚀 水灰比 

分 类 号：TU528.041[建筑科学—建筑技术科学]