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中文摘要：
结合理论分析、数值模拟和模型试验,建立了一种可以综合考虑温度、相对湿度、CO_2浓度、外掺料种类及掺量等因素影响的矿物掺合料混凝土碳化深度分析的实用预测模型。首先根据混凝土中CO_2的扩散规律和可碳化物质的质量守恒定律,推导了混凝土碳化分析的理论模型;然后基于混凝土的碳化机理和各反应物的质量平衡条件,建立了混凝土碳化分析的多场耦合数值模型,据此定量分析了温度、相对湿度和CO_2浓度对混凝土碳化深度的影响;最后通过引入温度、相对湿度和CO_2浓度等环境因素修正系数对理论模型进行修正,建立了一种矿物掺合料混凝土碳化深度分析的实用预测模型。通过与模型试验和经验模型的对比分析,验证了该模型的有效性和适用性。
英文摘要：
A practical prediction model for carbonation depth of concrete with mineral admixtures,which takes into account the influ-ences of temperature,relative humidity,CO2 concentration,type and quantity of mineral admixtures,was proposed based on the theoretical analysis,numerical simulation and experiments.The theoretical model for carbonation depth of concrete was derived by combining the rule of CO2 diffusion within concrete with the law of mass conservation for carbonatable substances first.Then a nonlinear multi-field coupled numerical model for the carbonation analysis of concrete was established based on the carbonation mechanism and mass balance condition of reactants.Meanwhile,the influences of temperature,relative humidity,and CO2 concentration on carbonation depth were quantification-ally investigated based on the multi-field coupled model.Finally,a practical prediction model for carbonation depth of concrete with miner-al admixtures was proposed by introducing the modification factors of temperature,relative humidity and CO2 concentration to modify the theoretical model.The accuracy and applicability of the proposed model were verified by comparing with the experimental data and exist-ing empirical models.
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