亚热带氯盐侵蚀环境承载混凝土结构劣化与耐久性研究

项目名称： 亚热带氯盐侵蚀环境承载混凝土结构劣化与耐久性研究

项目编号： No.51478404

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 建筑科学

项目作者： 焦俊婷

作者单位： 厦门理工学院

项目金额： 88万元

中文摘要： 我国亚热带沿海地区钢筋混凝土结构不仅受到荷载作用，同时经受亚热带气候、氯离子侵蚀作用，致使结构劣化加速，进而结构耐久性严重不足。本项目拟针对亚热带气候沿海环境下钢筋混凝土结构的实际工作状态，采用实验室模拟试验为主，辅以计算机模型分析，研究承载钢筋混凝土结构在亚热带气候中经历氯离子侵蚀后，外表状态、力学性能和材料内部微观状态的劣化。在不同比例荷载作用下，以裂缝宽度、混凝土材料性能（强度和水灰比）、保护层厚度为主要切入点，重点研究钢筋混凝土结构混凝土剥离、剩余承载力和刚度、滯回性能、延性和破坏形态等的变化；研究钢筋混凝土结构中氯离子、材料微观状态和化学成分的改变；研究在亚热带气候氯盐侵蚀作用后材料损伤本构模型，并进行混凝土结构非线性损伤分析；提出亚热带气候氯盐侵蚀环境下钢筋混凝土结构耐久性设计方法，以及裂缝宽度和保护层厚度的技术要求。

中文关键词： 不同比例荷载；氯离子侵蚀；亚热带气候；混凝土结构；耐久性

英文摘要： The reinforced concrete structures under loads are in the environment of subtropical climate and chlorid ion erosion along coastal area, and their structure mechanical properties are degraded quickly,then their durability become shortage. This project aims to research the apparent condition, mechanical property and microscopic material degradation of reinforced concrete structures under sustained loads in the environment of subtropical climate and chlorid salt erosion by simulation test research method in laboratory and the computer model analysis research method supplemented, according to the actual working state of the reinforced concrete structures in coastal area with subtropical climate. In different loading stress states,crack width,concrete(strength and water cement ratio) and cover thickness are as the main line;the key research is how the peeling,residual strength and stiffness, hysteretic behavior,the ductility,and failure mode of reinforced concrete structures to change; chloride ion, material microstate and chemical constituent will be studied; the damage constitutive model of materials will be researched in the environment of subtropical climate and chloride salt erosion, then some nonlinear damage analysis of reinforced concrete structures will be researched. The durability design method,limit load crack width and limit concrete cover depth of reinforced concrete structures will be afforded in the environment of subtropical climate and chloride salt erosion.

英文关键词： different proportional loading;chloride ion erosion;the subtropical climate;concrete structures;durability