摘要
随着服役年限的增加,钢筋混凝土结构中混凝土材料的力学性能会发生变化。归纳总结了混凝土的碳化、温度效应、氯离子腐蚀、冻融循环和硫酸盐腐蚀对大气环境下既有建筑混凝土强度的影响。目前研究混凝土强度经时变化规律的试验方法主要有现场实测和实验室加速试验,理论分析方法主要有实测统计法、单因素分析和多因素综合分析法。基于已有的试验方法和理论分析方法,归纳总结了现有研究所得的混凝土强度的经时变化规律。可为既有建筑结构的鉴定、评估以及灾后修复提供技术服务。
The mechanical property of concrete in RC structures is changing with time through the life cycle.The effects of carbonation,temperature effect,chloride corrosion,freeze-thaw cycling and sulfate attack on time-dependent concrete strength were summarized.The existing research methods to understand the effect of the influencing factors were tests carried out both in situ and laboratory and theoretical analysis involving statistical method,one factor influence mechanism method,and multiple factors influence mechanism method.Based on the current research results,time-dependent strength models of concrete were summarized.These strength models could offer technical service for assessment and retrofit of existing buildings.
出处
《结构工程师》
2011年第6期134-140,共7页
Structural Engineers
基金
国家科技支撑计划项目(2006BAJ03A04-06)
关键词
混凝土
既有建筑
抗压强度
经时变化
concrete
existing building
compressive strength
time dependent
