摘要
氯离子扩散系数和碳化速率是表征混凝土耐久性的主要指标。通过氯盐浸泡和快速碳化试验,基于试验检测和数据分析,研究了水灰比对氯离子扩散系数和碳化速率系数的影响规律。试验结果表明,水灰比越大,氯离子扩散系数越大,但水灰比过小时水灰比对扩散系数的影响程度降低;水灰比越大,混凝土碳化速度越快。碳化速率系数与水灰比成线性关系。结合试验数据并通过现有模型对比分析,给出较为合理的粉煤灰影响系数表达式和建议取值。
Chloride diffusion coefficient and carbonation rate are the main indexes to reflect concrete performance of durability. Based on the test and data analysis, experiment was carried out by chloride immersion test and rapid carbonation test to study the laws of chloride diffusion coefficient and carbonation rate influenced by cement water ratio. The results shows that the higher water-cement ratio the greater the chloride ion diffusion coefficient. However, as the water-cement ratio is lower, the influence degree reduces gradually. For carbonation, the higher water-cement ratio the greater the carbonation rate, and the relationship between carbonation rate coefficient and water-cement ratio is linear. By combining the experimental data and comparative analysis of existing models, more reasonable expressions of cement water ratio influence coefficient were proposed as well as the corresponding suggested values.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2011年第4期943-949,共7页
Bulletin of the Chinese Ceramic Society
基金
国家自然科学基金重点项目(No.50538070)
关键词
耐久性
扩散系数
表面氯离子浓度
碳化
水灰比
durability
diffusion coefficient
surface chloride concentration
carbonation
cement water ratio
