冻融对粉煤灰混凝土碳化性能影响规律研究

摘要

Based on the coupling test program of fly ash concrete with freezing-thaw and carbonation, the laboratory simulation test is carried out. The laws of carbonation depth of the fly ash concrete suffered the freezing-thaw cycle in dif-ferent test modes and the influence of fly ash dosage on concrete carbonation depth after the freezing-thaw cycle are stud-ied. Defining the influence coefficient of carbonation depth of concrete under freezing-thaw cycles, the mechanism of cou-pling of freezing-thaw and carbonation is analyzed, and the roles of freezing-thaw and carbonation in the coupling process are obtained.%在设计粉煤灰混凝土冻融与碳化耦合试验方案的基础上，开展了实验室模拟试验，研究了不同试验模式下粉煤灰混凝土遭受冻融循环后的碳化深度规律以及粉煤灰掺量对混凝土冻融后碳化深度的影响。引入冻融循环作用对混凝土碳化深度发展的影响系数，分析了冻融与碳化耦合作用机理，得出了冻融和碳化反应在耦合过程中的效应。