不同pH值条件下水泥砂浆硫酸盐侵蚀损伤评价  

Damage Evaluation of Sulfate Erosion to Cement Mortar under Different p H-Value Conditions

作　　者：刘子铭[1] 熊锐[1] 关博文[1] 杨发[2] 杨晓凯[1] 王小雯[1] 陈华鑫[1] 

机构地区：[1]长安大学材料科学与工程学院,西安710061 [2]云南省交通运输厅,昆明650214

出　　处：《硅酸盐通报》2016年第7期2247-2253,共7页Bulletin of the Chinese Ceramic Society

基　　金：青海省重大科技专项(2014-GX-A2A);中国博士后科学基金项目(2014M550476)

摘　　要：采用干湿循环作用下不同pH值条件(2,7,12)与不同浓度(2.5%、5%、10%)Na_2SO_4溶液协同作用加速劣化试验,以质量损失率、抗折强度损失率和抗压强度损失率作为评价指标评价了水泥砂浆的盐蚀损伤效应;运用灰熵法分析了水泥砂浆盐蚀损伤效应影响因素-pH值、Na-2SO_4浓度、水灰比-的显著性。结果表明:水泥砂浆在酸性环境下的硫酸盐侵蚀损伤较碱性环境下更为严重;水灰比对水泥砂浆盐蚀损伤效应有最显著影响;掺入适量粉煤灰有利于提高水泥砂浆抗硫酸盐侵蚀性能。研究成果可为硫酸盐富集地区水泥结构物材料组成设计提供有益参考。The synergistic effects of different pH-values （2,7,12） and different concentrations （ 2.5 %, 5% , 10% ） Na2SO4 solution were used to accelerate the degradation test, and the corrosion resistance of cement mortar was evaluated by the rate of mass loss, flexural strength and compressive strength. The influence factors of salt corrosion damage effect of cement mortar are analyzed by using the grey entropy method. The pH value, Na2SO4 concentration, water-cement ratio, and the significance of the damage are analyzed. The results show that the corrosion damage of cement mortar in the acid environment is more serious than that in the alkaline environment. Water cement ratio has the most significant effect on the salt erosion damage effect of cement mortar. The addition of appropriate amount of fly ash can improve the sulfate resistance of cement mortar. The research results can provide useful reference for the design of the material composition of the cement structure in the sulfate enrichment areas.

关 键 词：水泥砂浆 硫酸盐侵蚀 酸盐复合环境 碱盐复合环境 微观结构 

分 类 号：TU528[建筑科学—建筑技术科学]