低温环境下水泥基材料抗硫酸盐侵蚀性能试验研究  

Research on sulfate resistance of cement based materials at low temperature

作　　者：王云天[1] 王起才[1] 郭玉柱[1] 谢松林[1] 

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,甘肃兰州730070

出　　处：《新型建筑材料》2018年第2期112-115,共4页New Building Materials

基　　金：长江学者和创新团队发展计划滚动支持项目(IRT_15R29)

摘　　要：采用0.36、0.50这2种水胶比的普通硅酸盐水泥、中抗硫盐酸水泥以及加入矿粉与纳米SiO_2的水泥砂浆试件,测试各试样在(5±1)℃的3%Na_2SO_4溶液中浸泡后的强度变化情况,综合考虑强度与抗蚀系数,对砂浆的抗硫酸盐侵蚀性能进行评价。结果表明:在5℃下,0.36水胶比试件的强度高于0.50水胶比试件,抗硫酸盐侵蚀性能随着水胶比的降低而提高;加入矿物掺合料提高了水泥砂浆的抗硫酸盐侵蚀性能,并且纳米SiO_2的掺量越高效果越明显。砂浆抗硫酸盐侵蚀性能优劣顺序为:15%矿粉+3%纳米SiO_2>15%矿粉+1%纳米Si O_2>中抗硫做盐水泥>普通硅酸盐水泥。Ordinary Pordaud cement, medium sulfate-resistant cement and slag with nano Si02 cement mortar samples were pre-pared with cement ratio of 0.36 and 0.50. Mortar samples were stored in 3% NazSO4 sulfate solution at （5＋1） ℃,and their strengthdevelopments were measured. Sulfate resistance of mortar samples was evaluated by considering the mortar strength and corrosion re-sistance. The results show that strength of 0.36 water-cement ratio specimen is higher than 0.50 water-cement ratio specimen under5 ℃ environment, the sulfate resistance increases with the decrease of W/C ratio, and the addition of mineral admixture improves thesulfate resistance,the high the nano SiO： content is,the better the sulfate resistance effect. The mortar resistance to sulfate attack was15% slag＋3% nano Si0z〉15% slag＋l% nano SiO2〉medium sulfate-resistant cement〉ordinary Portland cement.

关 键 词：低温 水胶比 硫酸盐侵蚀 水泥砂浆 

分 类 号：TU528[建筑科学—建筑技术科学]