低温环境下水泥基材料抗硫酸盐侵蚀性能试验研

关键字：低温环境下,水泥基,材料,抗硫酸盐,侵蚀

（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）

 
 
    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SiO2的水泥砂浆试件，测试各试样在（5±1） ℃的3%Na2SO4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SiO2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SiO2>15%矿粉+1%纳米SiO2>中抗硫做盐水泥>普通硅酸盐水泥。
    关键词：低温；水胶比；硫酸盐侵蚀；水泥砂浆
    中图分类号：TU528        文献标识码：A        文章编号：1001-702X（2018）02-0112-04
 

Research on sulfate resistance of cement based materials at low temperature
WANG Yuntian，WANG Qicai，GUO Yuzhu，XIE Songlin
（National and Provincial Joint Engineering Laboratory of Road & Bridge Disaster Prevention and Control，
Lanzhou Jiaotong University，Lanzhou 730070，China）

    Abstract：Ordinary Portland cement，medium sulfate-resistant cement and slag with nano SiO2 cement mortar samples were prepared with cement ratio of 0.36 and 0.50. Mortar samples were stored in 3% Na2SO4 sulfate solution at（5±1） ℃，and their strength developments were measured. Sulfate resistance of mortar samples was evaluated by considering the mortar strength and corrosion resistance. The results show that strength of 0.36 water-cement ratio specimen is higher than 0.50 water-cement ratio specimen under 5 ℃ environment，the sulfate resistance increases with the decrease of W/C ratio，and the addition of mineral admixture improves the sulfate resistance，the high the nano SiO2 content is，the better the sulfate resistance effect. The mortar resistance to sulfate attack was 15% slag+3% nano SiO2>15% slag+1% nano SiO2>medium sulfate-resistant cement>ordinary Portland cement.
    Key word：low temperature，water-cement ratio，sulfate attack，cement mortar