低温硫酸盐侵蚀环境中水泥石腐蚀产物(英文)  

EROSION SUBSTANCE OF CEMENT-BASED MATERIAL IN SULFATE ATTACK ENVIRONMENT AT LOW TEMPERATURE

作　　者：张风臣[1] 马保国[1] 尹耿[1] 吴媛媛[1] 朱艳超[1] 

机构地区：[1]武汉理工大学,硅酸盐材料工程教育部重点实验室,武汉430070

出　　处：《硅酸盐学报》2008年第10期1411-1416,共6页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(50378075);国家"十一五"科技支撑计划(2006BAF02A24)资助项目。

摘　　要：研究了水胶比为 0.45,掺 35%石灰石粉水泥基材料标准养护 28 d 后在(5±2) ℃浸泡于 SO24–质量分数为 3.38%的钠盐、镁盐、铝盐 3 种硫酸盐侵蚀溶液中 15 周时的破坏状况和强度损失率。采用 Fourier 红外光谱、X 射线衍射、扫描电子显微镜、能谱以及 Raman 光谱确定水泥石腐蚀物相和组成。结果表明:镁盐溶液中试件抗压强度损失率最大,其次是钠盐溶液中试件,铝盐溶液中试件抗压强度损失率最小;钠盐溶液和铝盐溶液中水泥石主要腐蚀产物是钙矾石和石膏;镁盐溶液中水泥石主要腐蚀产物是钙矾石、石膏、碳硫硅酸钙和少量水镁石。Cement-based material made at a water-binder ratio of 0.45, with 35% cement replacement ratio by limestone powder were cured under standard conditions for 28 d and then immersed in three kinds of sulfate solutions （NaESO4, MgSO4, Al2（SO4）3·18H2O） with 2 3.38% mass fraction of SO4 for 15 weeks at （5±2） ℃. Exterior attack and ratio of compressive strength loss were studied, and erosion substances of cement-based material were investigated by means of Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, and energy dispersive spectrum as well as Raman spectra. The results show that the ratio of compressive strength loss in MgSO4 solution is the greatest, and that in Al2（SO4）3·18H2O solution is the lowest among these three kinds of sulfate solutions. In Na2SO4 arid Al2（SO4）3·18H2O sulfate solutions, the main erosion substances are ettringite and gypsum. And in MgSO4 sulfate solution the main erosion substances are ettringite, gypsum, thaumasite and brucite.

关 键 词：硫酸盐侵蚀 水泥基材料 侵蚀物相 碳硫硅酸钙 

分 类 号：TU528[建筑科学—建筑技术科学]