粉煤灰掺量对混凝土氯离子扩散系数和碳化速率的影响  

Influence of fly ash content on chloride diffusion coefficient and carbonation rate of concrete

作　　者：吴国坚 金骏 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,浙江杭州310019 [2]浙江大学结构工程研究所,浙江杭州310058 [3]青岛绿城建筑设计有限公司,山东青岛266071

出　　处：《新型建筑材料》2011年第8期8-11,共4页New Building Materials

基　　金：国家自然科学基金重点项目(50538070)

摘　　要：通过氯盐浸泡和快速碳化试验,研究了粉煤灰掺量对混凝土氯离子扩散系数和碳化速率系数的影响规律。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。以普通混凝土的氯离子扩散系数为基准,粉煤灰掺量的影响系数kF=D/DF0=4.03(mF/mF+C)2-2.48(mF/mF+C)+1.02;以普通混凝土的碳化速率系数为基准,粉煤灰掺量的影响系数kFc=1.07exp(2.16mF/mF+C)。Based on the chloride immersion test and rapid carbonation test,the laws of chloride diffusion coefficient and carbonation rate influenced by fly ash content were studied. By combining the experimental data and comparative analysis of existing models,more reasonable expressions of fly ash influence coefficient as well as the corresponding suggested values were proposed.Based on the chloride diffusion coefficient of ordinary concrete,the influence coefficient of fly ash content is kF=D/DF0= 4.03（mrCmrc）2-2.48（mdmrC）＋1.02.Based on the carbonation rate of ordinary concrete,the influence coefficient of fly ash content is kr,= 1.07exp （2.16mrCmr＋c）.

关 键 词：混凝土 耐久性 氯离子 扩散系数 表面氯离子浓度 碳化 粉煤灰 

分 类 号：TU528[建筑科学—建筑技术科学]