摘要
采用在清水和硫酸盐溶液中进行干湿循环的试验方法,分析讨论了水胶比、粉煤灰细度、粉煤灰掺量、粉煤灰与硅灰复掺及硫酸盐溶液浓度对水泥-粉煤灰复合胶凝材料抗硫酸盐结晶膨胀侵蚀性能影响的规律.试验结果表明:硫酸盐结晶膨胀侵蚀对胶砂或混凝土试件的破坏较盐类化学腐蚀更为严重;以相对抗折强度进行评价时,水胶比的降低、粉煤灰细度的增加及粉煤灰与少量硅灰的复掺均不同程度地提高了水泥-粉煤灰复合胶凝材料的抗硫酸盐结晶膨胀侵蚀性能.
By using drying and wetting cycles in water and sulfate salt solution, the effect of several factors on the resistance to sulfate salt crystallization of cementfly ash composite binder materials was studied, the factors include: waterbinder ratio, fineness and content of fly ash, fly ash blended with less silica fume and sulfate salt solution concentration. The results show that the breakage caused by sulfate salt crystallization corrosion on concrete is more severe compared to sulfate salt chemical corrosion. When evaluated with relative flexural strength, the decrease of waterbinder ratio, increase of fineness of fly ash and addition of fly ash together with silica fume all improve the resistance to sulfate salt crystallization of cementfly ash composite binder materials in different extent.
出处
《建筑材料学报》
EI
CAS
CSCD
2003年第4期350-355,共6页
Journal of Building Materials
基金
国家自然科学基金资助项目(50178014)
国家863计划项目(2002AA335020)
关键词
硫酸盐结晶
侵蚀
超细粉煤灰
干湿循环
水胶比
水泥粉煤灰
sulfate salt crystallization
corrosion
ultra-fine fly ash
drying and wetting cycles
water-binder ratio
