除冰盐作用下混凝土桥梁氯化物侵入模型的评价

M. Marić, J. Ožbolt, G. Balabanić, I. Pavlica
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引用次数: 0

摘要

在过去的四十年中,混凝土中氯离子迁移的数值模型已经得到了改进,但是,它们在现有结构中的应用仍然没有达到令人满意的水平。简单的模型存在许多局限性,无法应用于真实环境中的现有结构,而更全面的使用寿命预测模型则不适合日常的工程实践。两个氯化物进入模型,一个更全面的3D化学-湿-热机械(CHTM)模型被应用到MASA软件和著名的Life-365中,用于案例研究:克罗地亚山区的高速公路桥梁。这两种模型都能够预测混凝土中的氯化物含量,并且与接触除冰盐11年和14年后大桥上的测量数据吻合得很好。然而,使用Life-365进行数值分析时,使用测量结果进行校准会导致更高的表面氯化物含量和初始氯化物扩散系数,假设混凝土未开裂,表面氯化物含量恒定。另一方面,3D CHTM模型考虑了更现实的条件:温度变化、地表水和氯化物含量、干湿循环、氯化物在开裂和未开裂混凝土中的扩散和对流。因此,氯化物扩散率和表面氯化物含量的输入值不需要对每个氯化物剖面进行校准,这与Life-365应用的情况不同。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Evaluation of chloride-ingress models on concrete bridge exposed to deicing salts
Numerical models for chloride transport in concrete have been improved in the last four decades, however, their application to existing structures is still not at a satisfactory level. While simple models have many limitations that cannot be applied to existing structures in a real environment, more comprehensive models for service life prediction are not suitable for everyday engineering practice. Two chloride ingress models, a more comprehensive 3D chemo-hygro-thermo mechanical (CHTM) model implemented into the MASA software and well-known Life-365, are used for a case study: motorway bridge in the mountain region in Croatia. Both models are capable to predict the chloride content in concrete and match well with measured data on the bridge after 11 and 14 years of exposure to deicing salts. However, calibration with measured results led to higher values of surface chloride content and initial chloride diffusion coefficient for numerical analyses using the Life-365, which assumes that the concrete is uncracked and the surface chloride content is constant. On the other hand, the 3D CHTM model considers more realistic conditions: variable temperature, surface water and chloride contents, wetting and drying cycles, chloride diffusion and convection in cracked and un-cracked concrete. Consequently, input values for chloride diffusivity and surface chloride content do not require calibration for each chloride profile, as is the case for the Life-365 application.
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