轴压荷载对混凝土碳化的影响机理及模型研究  

Mechanism and Model Study on the Influence of Axial Compression Load on Concrete Carbonization

作　　者：孙书琪 熊传胜 李媛媛 SUN Shu-qi;XIONG Chuan-sheng;LI Yuan-yuan(School of Civil Engineering,Qingdao University of Technology,Qingdao 266525,China)

机构地区：[1]青岛理工大学土木工程学院,青岛266525

出　　处：《建材世界》2024年第2期40-44,共5页The World of Building Materials

基　　金：国家重点研发计划“政府间国际科技创新合作”等重点专项(2023YFE0121700);国家自然科学基金(52379126,U22A20229);青岛市科技计划项目(23-2-1-248-zyyd-jch)。

摘　　要：通过对普通混凝土进行轴压荷载-碳化耦合试验,研究轴压荷载对普通混凝土碳化的影响机理。利用MATLAB对试验数据进行拟合,建立考虑荷载作用的混凝土碳化预测模型,分析轴压荷载对混凝土碳化深度的影响。结果表明:混凝土的碳化深度随载荷(率)的增加而增加,且与CO_(3)^(2-)离子的含量息息相关。对碳化后距离混凝土表面CO_(3)^(2-)离子的含量进行拟合,得到CO_(3)^(2-)离子的扩散系数随时间变化的模型,并通过质量守恒和Fick定律建立了轴压荷载作用下普通混凝土碳化的模型,模拟结果与试验结果具有较好的一致性。By conducting axial compression load-carbonation coupling test on ordinary concrete,the influence mechanism of axial compression load on carbonation of ordinary concrete was studied.MATLAB was used to fit the test data.This paper establish a concrete carbonation prediction model considering the load,and analyze the impact of axial compression load on the carbonation depth of concrete.The results show that the carbonation depth of concrete increases with the increase of load(rate)and is closely related to the content of CO_(3)^(2-)ions.The content of CO_(3)^(2-)ions from the concrete surface after carbonization was fitted to obtain a model of the diffusion coefficient of CO_(3)^(2-)ions changing with time.A model of carbonization of ordinary concrete under axial compression load was established through mass conservation and Fick's law.Simulation results have good consistency with the test results.

关 键 词：轴压荷载 碳化 影响机理 碳化模型 

分 类 号：TU528[建筑科学—建筑技术科学]