腐蚀环境下钢筋混凝土的轴向受压承载力研究  

Axial Compression Bearing Capacity of Reinforced Concrete Under Corrosive Environment

作　　者：李文 高玮[1] LI Wen;GAO Wei(College of Civil Engineering and Transportation,Hohai University,Nanjing 210000,China)

机构地区：[1]河海大学土木与交通学院,南京210000

出　　处：《河南科学》2018年第3期436-442,共7页Henan Science

基　　金：国家自然科学基金(41072233);教育部中央高校科研业务费项目(2014B07014)

摘　　要：通过预测混凝土碳化深度,钢筋的氯离子侵蚀速率及钢筋起始锈蚀时间,建立了腐蚀环境下钢筋混凝土承载力与时间之间的关系.通过算例分析混凝土保护层对钢筋混凝土承载力的影响,得到保护层厚度对钢筋混凝土承载力的影响规律,即钢筋混凝土保护层厚度的增加可以提高腐蚀后钢筋混凝土的承载力,主要原因为保护层厚度的增加推迟了钢筋起始锈蚀时间.并分析了钢筋质量损失率与时间的关系以及钢筋直径对钢筋锈蚀率的影响,得到了钢筋直径对钢筋锈蚀率的影响规律,即直径大的钢筋对锈蚀的抵抗能力更强,钢筋直径越大锈蚀率越低.By predicting the carbonation depth of concrete,chloride corrosion rate of reinforcing steel and initial corrosion time of steel bar,the relationship between the bearing capacity and time of reinforced concrete under corrosive environment is established.The pattern of concrete protective layer’s effect on reinforced concrete bearing capacity is derived by analyzing the results of example.That is,due to the delay of steel’s initial corrosion result from the increment of protective layer thickness,we find the increasing of reinforced concrete protective layer thickness can help to reinforce the bearing capacity of reinforced concrete after corrosion.The relationship between the loss rate of steel and the time and the influence of steel diameter on the corrosion rate of reinforcement are analyzed.The influence rule of the diameter of reinforcing steel on the corrosion rate of reinforcement is obtained.The results show the corrosion resistance of large diameter steel bar is stronger than that of steel bar,and the bigger the diameter of reinforcement is,the lower the corrosion rate is.

关 键 词：耐久性 碳化 钢筋腐蚀 承载力 

分 类 号：U462.36[机械工程—车辆工程]