混凝土劣化对钢筋与混凝土间粘结性能的影响  

Effect of Deterioration Degree on the Bond Behavior between Concrete and Deformed Steel Bar

作　　者：李强 吴元周 唐鹏 田兵 邱仕学 吕恒林 韩坤 LI Qiang;WU Yuan-zhou;TANG Peng;TIAN Bing;QIU Shi-xue;LYU Heng-lin;HAN Kun(China Building Material Test&Certification Group Co.,Ltd,Xuzhou Jiangsu 221000 China;School of Mechanics and Civil Engineering,China University of Mining and Technology Xuzhou Jiangsu 221116 China;Xuzhou Housing Safety Appraisal Center,Xuzhou Jiangsu 221000 China)

机构地区：[1]中国建材检验认证集团徐州有限公司,江苏徐州221000 [2]中国矿业大学力学与土木工程学院,江苏徐州221116 [3]徐州市房屋安全鉴定中心,江苏徐州221000

出　　处：《江苏建筑》2021年第S01期107-111,共5页Jiangsu Construction

基　　金：国家重点研发计划项目(2018YFD1100203)。

摘　　要：对同种型号变形钢筋分别与3种不同配方混凝土构成的试件在不同程度劣化后进行拉拔试验,研究试件破坏模式和粘结性能退化规律,分析混凝土抗拉强度、碳化深度及相对保护层厚度对钢筋与混凝土间粘结性能的影响程度。结果表明:随着混凝土劣化程度增加,试件破坏形式由剪切形破坏转变为剪切破坏的同时伴随着上部混凝土的压碎;钢筋-混凝土间极限粘结强度随着碳化深度增加先增加后减小,随着相对保护层厚度的减小而降低;强度相对较高的混凝土劣化后,即使强度降至与未劣化的低强度混凝土相同,在保持粘结性能方面仍显现优势;混凝土锈胀开裂后,与钢筋间的粘结性能则快速降低。结合钢筋周边未劣化混凝土厚度分3种状况对钢筋与混凝土间粘结力模型的适用性进行分析。Experimental investigation was conducted to explore the effect of concrete deterioration on the bond strength between concrete and deformed steel bar.Three types of concrete were included and the steel bars were pulled out,with the main variables being the tensile strength of concrete,water cement ratio w/c and the effective thickness of concrete outside of the steel bar.The results indicated that the failure mode of specimens changed from splitting failure to concrete crushing as the deterioration of concrete increased.The ultimate bond strength increased before the steel bar corroded and then decreased,and the slip corresponding changed together.The specimen with higher strength grade has the larger ultimate bond strength.The bond strength model between concrete and deformed steel bar is optimized with the real-time strength of concrete and the effective concrete cover thickness considered.

关 键 词：劣化 粘结性能 强度等级 计算模型 混凝土保护层厚度 

分 类 号：TU528[建筑科学—建筑技术科学]