考虑界面过渡区及集料因素的水泥基材料碳化模型  

Carbonation model of cementitious materials considering interfacial transition zone and aggregate factors

作　　者：沈奇真 潘钢华[2] SHEN Qizhen;PAN Ganghua(School of Civil Engineering,Ludong University,Yantai 264025,Shandong,P.R.China;School of Materials Science and Engineering,Southeast University,Nanjing 211189,P.R.China)

机构地区：[1]鲁东大学土木工程学院,山东烟台264025 [2]东南大学材料科学与工程学院,南京211189

出　　处：《土木与环境工程学报（中英文）》2023年第4期154-162,共9页Journal of Civil and Environmental Engineering

基　　金：山东省自然科学基金(ZR2020QE250)。

摘　　要：集料和界面过渡区对水泥基材料抗碳化性能有显著影响。基于Fick第二定律,提出一种考虑集料和界面过渡区影响的CO_(2)扩散模型,模型中首次引入界面过渡区的扩散系数并给出相应参数的计算方法,并基于质量守恒定律给出CO_(2)反应模型,利用该模型研究荷载作用下C30和C50混凝土中CO_(2)的浓度分布。结果表明,考虑集料和界面过渡区影响能更准确地计算CO_(2)在水泥基材料中的扩散系数及碳化深度值。通过与文献中的试验数据进行比较,进一步验证了理论模型的可靠性。模型将集料和界面过渡区作为评价混凝土耐久性的重要因素,为钢筋混凝土结构的设计和寿命预测提供依据。Aggregate and interfacial transition zone(ITZ)have significant influence on the carbonation resistance of cementitious materials.Based on Fick's second law,a CO_(2) diffusion model considering the influence of aggregates and ITZ is proposed in this paper,the diffusion coefficient of interfacial transition zone is introduced for the first time and the calculation method of corresponding parameters in this model is given.At the same time,a CO_(2) reaction model is established based on the law of mass conservation,and the CO_(2) concentration distribution in C30 and C50 concrete under load is studied by using this model.The results show that the diffusion coefficient and depth of carbonation of CO_(2) in cementitious materials can be calculated more accurately by considering aggregate and ITZ effects.Finally,the reliability of the theoretical model is further verified by comparing with the experimental data in literature.Therefore,the model takes aggregate and ITZ as important factors to evaluate the durability of concrete,which provides foundation for the design and life prediction of reinforced concrete structures.

关 键 词：水泥基材料 界面过渡区 集料 碳化模型 

分 类 号：TU528[建筑科学—建筑技术科学]