多因素作用下混凝土中性化深度统一预测模型  

Unified prediction model of concrete neutral depth under multiple factors

作　　者：许崇法[1,2] 曹双寅[1] 范沈龙[3] 刘其伟[2] 

机构地区：[1]东南大学土木工程学院,南京210096 [2]东南大学交通学院,南京210096 [3]上海建筑设计研究院有限公司,上海200041

出　　处：《东南大学学报（自然科学版）》2014年第2期363-368,共6页Journal of Southeast University：Natural Science Edition

基　　金：国家重点基础研究发展计划(973计划)资助项目(2012CB026200)

摘　　要：依据扩散理论及室内试验,对碳化、酸雨、应力等单一因素和多因素耦合作用下的混凝土构件中性化深度进行了研究.通过理论研究、数值模拟和试验数据的回归分析,建立了混凝土中性化深度统一预测模型.研究表明:碳化和酸雨存在耦合现象,酸雨在某种程度上抑制碳化作用,耦合系数小于1;无论酸雨、碳化单一因素或耦合作用,混凝土中性化深度值随侵蚀时间的增加而增加,中性化深度值在前期增加比较快,继而中性化速度逐渐减小,中性化深度与时间平方根呈正比例关系;拉应力促进混凝土中性化,而压应力抑制其中性化,应力与混凝土中性化深度值之间呈近似线性关系,最后通过试验数据拟合出不同腐蚀模式下的应力影响因子.On the basis of the diffusion theory and laboratory tests,the factors such as carbonization, acid rain,stress and their coupling effects on the neutral depth of the concrete component were stud-ied.Through theoretical research,numerical simulation and regression analysis of experimental data, a concrete neutralization depth unified prediction model was established.The research results show that coupling of carbonization and acid rain exists;acid rain inhibits the carbonization to some ex-tent;the coupling coefficient of acid rain and carbonization is less than 1 .No matter acid rain,car-bonization or their coupling interaction,the carbonation depth value of concrete increases as erosion time increases.The neutral velocity is fast in the early stages and decreases with the passage of time. The neutral depth is directly proportional with the square root of time.The tensile stress can promote the neutralization of concrete,while the compressive stress inhibits it.The relationship between the stress and concrete carbonation depth value is approximating the linear.Finally,stress factors under different corrosion modes were fitted based on the experimental data.

关 键 词：混凝土结构 统一预测模型 数值模拟 混凝土中性化 多因素 耦合作用 

分 类 号：U446.1[建筑科学—桥梁与隧道工程]