多因素作用下混凝土中性化深度统一预测模型

发布时间：2019-05-18 05:17

【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.
[Abstract]:Based on the diffusion theory and laboratory tests, the neutralization depth of concrete members under the coupling of carbonation, acid rain, stress and other factors is studied. Through theoretical research, numerical simulation and regression analysis of experimental data, a unified prediction model of neutralized depth of concrete is established. The results show that there is a coupling phenomenon between carbonation and acid rain, and acid rain can inhibit carbonation to some extent, and the coupling coefficient is less than 1. Regardless of acid rain, carbonation single factor or coupling effect, the neutralization depth value of concrete increases with the increase of erosion time, and the neutralization depth value increases rapidly in the early stage, and then the neutralization speed decreases gradually. There is a positive proportional relationship between the neutralized depth and the square root of time. Tensile stress promotes the neutralization of concrete, while compressive stress suppresses its neutralization, and there is an approximate linear relationship between stress and neutralization depth of concrete. Finally, the stress influencing factors under different corrosion modes are fitted by test data.
【作者单位】：东南大学土木工程学院;东南大学交通学院;上海建筑设计研究院有限公司;
【基金】：国家重点基础研究发展计划(973计划)资助项目(2012CB026200)
【分类号】：TU528

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