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%
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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 drywet 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.
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 drywet 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.
引文
[1]亢景富.混凝土硫酸盐侵蚀研究中的几个基本问题[J].混凝土,1993,(3):9-18.
[2]申春妮,杨德斌,方祥位,等.混凝土硫酸盐侵蚀影响因素的探讨[J].水利与建筑工程学报,2004,2(2):16-19.
[3]朱孔峰,逯静洲,刘亚,等.历经荷载后受硫酸盐侵蚀的混凝土力学性能[J].长江科学院院报,2018,35(1):143-146.
[4]冷发光,马孝轩,田冠飞.混凝土抗硫酸盐侵蚀试验方法[J].东南大学学报,2006,36(6):45-48.
[5]刘赞群.混凝土硫酸盐侵蚀基本机理研究[D].长沙:中南大学,2009.
[6]张风臣,马宝国,尹耿,等.低温硫酸盐侵蚀环境中水泥石腐蚀产物[J].硅酸盐学报,2008,36(10):1413-1416.
[7]楼梁伟.水泥基材料低温抗硫酸盐侵蚀性能研究[D].重庆:重庆大学,2008.
[8]马保国,高小建,罗忠涛.矿物掺合料对水泥砂浆TSA侵蚀的影响[J].材料科学与工程学报,2006,24(2):230-234.
[9]高润东,赵顺波,李庆斌,等.干湿循环作用下混凝土硫酸盐侵蚀劣化机理试验研究[J].土木工程学报,2010,43(2):48-54.
[10]王海龙,董宜森,孙晓燕,等.干湿交替环境下混凝土受硫酸盐侵蚀劣化机理[J].浙江大学学报(工学版),2012,46(7):1255-1261.
[11]孙迎召,牛荻涛,姜磊,等.干湿循环条件下混凝土硫酸盐侵蚀损伤分析[J].硅酸盐通报,2013,32(7):1406-1409.
[2]申春妮,杨德斌,方祥位,等.混凝土硫酸盐侵蚀影响因素的探讨[J].水利与建筑工程学报,2004,2(2):16-19.
[3]朱孔峰,逯静洲,刘亚,等.历经荷载后受硫酸盐侵蚀的混凝土力学性能[J].长江科学院院报,2018,35(1):143-146.
[4]冷发光,马孝轩,田冠飞.混凝土抗硫酸盐侵蚀试验方法[J].东南大学学报,2006,36(6):45-48.
[5]刘赞群.混凝土硫酸盐侵蚀基本机理研究[D].长沙:中南大学,2009.
[6]张风臣,马宝国,尹耿,等.低温硫酸盐侵蚀环境中水泥石腐蚀产物[J].硅酸盐学报,2008,36(10):1413-1416.
[7]楼梁伟.水泥基材料低温抗硫酸盐侵蚀性能研究[D].重庆:重庆大学,2008.
[8]马保国,高小建,罗忠涛.矿物掺合料对水泥砂浆TSA侵蚀的影响[J].材料科学与工程学报,2006,24(2):230-234.
[9]高润东,赵顺波,李庆斌,等.干湿循环作用下混凝土硫酸盐侵蚀劣化机理试验研究[J].土木工程学报,2010,43(2):48-54.
[10]王海龙,董宜森,孙晓燕,等.干湿交替环境下混凝土受硫酸盐侵蚀劣化机理[J].浙江大学学报(工学版),2012,46(7):1255-1261.
[11]孙迎召,牛荻涛,姜磊,等.干湿循环条件下混凝土硫酸盐侵蚀损伤分析[J].硅酸盐通报,2013,32(7):1406-1409.
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