温度、相对湿度循环下砂浆的硫酸盐半浸泡损伤机理研究  

Study on the damage mechanism of mortar partially soaked in sulfate under temperature and humidity cycling

作　　者：杨枫林 赵亚松 陈菲 贺知章 高建明[2] YANG Fenglin;ZHAO Yasong;CHEN Fei;HE Zhizhang;GAO Jianming(Nantong Construction Concrete Co.,Ltd.,Nantong 226000,China;School of Materials Science and Engineering,Southeast University,Nanjing 211100,China)

机构地区：[1]南通市建设混凝土有限公司,江苏南通226000 [2]东南大学材料科学与工程学院,江苏南京211100

出　　处：《混凝土与水泥制品》2025年第2期8-12,共5页China Concrete and Cement Products

基　　金：国家自然科学基金项目(52171254)。

摘　　要：研究了不同温度、相对湿度条件下砂浆试件半浸泡在硫酸钠溶液中的损伤劣化规律,进行了试件的质量变化率、相对动弹性模量测试,并采用扫描电子显微镜、X射线衍射、X射线断层扫描、压汞仪法分析了硫酸盐侵蚀机理。结果表明:试件浸泡部分主要受到硫酸盐化学侵蚀,而干燥部分(未浸泡)主要受到硫酸盐物理侵蚀(膨胀);温度循环和相对湿度循环均能加速硫酸盐侵蚀,但不改变试件损伤劣化的发展趋势;试件的质量变化率和相对动弹性模量总体上均呈先增后降的趋势;温度循环、相对湿度循环能显著影响试件中10 nm~10μm毛细孔的孔隙率,但对凝胶孔和大孔的影响相对较小。The damage and deterioration laws of mortar specimens partially soaked in sodium sulfate solution under different temperature and relative humidity conditions were studied.The mass change rate and relative dynamic elastic modulus of the specimens were tested,and the sulfate corrosion mechanism was analyzed using scanning electron microscopy,X-ray diffraction,X-ray tomography,and mercury intrusion porosimetry.The results show that the partially soaked specimen is mainly subjected to sulfate chemical erosion,while the dry part(not soaked)is mainly subjected to sulfate physical erosion(expansion).Both temperature cycling and relative humidity cycling can accelerate sulfate corrosion,but do not change the development trend of specimen damage and deterioration.The overall trend of the mass change rate and relative dynamic elastic modulus of the specimens is increasing first and then decreasing.Temperature cycling and relative humidity cycling can significantly affect the porosity of 10 nm~10μm capillary pores in the specimen,but have relatively little effect on gel pores and macropores.

关 键 词：温度 相对湿度 循环 砂浆 硫酸盐 半浸泡 

分 类 号：TQ177.62[化学工程—硅酸盐工业]