水灰比对混凝土氯离子扩散系数和碳化速率影响的试验研究  

Experimental Study on Influence of Cement Water Ratio on Chloride Diffusion Coefficient and Carbonation Rate of Concrete

作　　者：金骏 吴国坚 翁杰 王传坤[2,3] 岳增国[2] 许晨[2] 

机构地区：[1]国家建筑五金材料产品质量监督检验中心,杭州310019 [2]浙江大学结构工程研究所,杭州310058 [3]青岛绿城建筑设计有限公司,青岛266071

出　　处：《硅酸盐通报》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)

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.

关 键 词：耐久性 扩散系数 表面氯离子浓度 碳化 水灰比 

分 类 号：TU528[建筑科学—建筑技术科学]