硫酸盐干湿环境下碳纤维布-黏土砖砌体界面性能试验  

Experiment on interfacial bonding performance between CFRP and clay brick under sulfate attack of wetting-drying cycles

作　　者：靳文强[1,2] 胡珈源 王琦 李超鹏 于永辉 张家玮[1,2] JIN Wen-qiang;HU Jia-yuan;WANG Qi;LI Chao-peng;YU Yong-hui;ZHANG Jia-wei(School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;National and Provincial Joint Engineering Laboratory of Road&Bridge Disaster Prevention and Control,Lanzhou Jiaotong University,Lanzhou 730070,China;China Railway Design Corporation,Tianjin 300308,China)

机构地区：[1]兰州交通大学土木工程学院,兰州730070 [2]兰州交通大学道桥工程灾害防治技术国家地方联合工程实验室,兰州730070 [3]中国铁路设计集团有限公司,天津300308

出　　处：《吉林大学学报（工学版）》2024年第5期1368-1376,共9页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家自然科学基金项目(52068043);甘肃省建设科技攻关项目(JKR2021-07);兰州市人才创新创业项目(2019-RC-78)。

摘　　要：对粘贴碳纤维增强复合材料(CFRP)的烧结黏土砖砌块进行双面剪切试验,考察硫酸盐干湿循环不同周期下CFRP-黏土砖砌块界面破坏形态和粘结性能,讨论了硫酸盐腐蚀下CFRP-黏土砖砌块界面粘结性能退化机理。结果表明:CFRP-黏土砖砌块界面的破坏形态受硫酸盐干湿循坏影响较大;界面粘结性能(极限承载力、峰值剪应力)随循环时间呈先小幅增加后加速下降的趋势。提出了受循环周期影响的CFRP-黏土砖砌块界面粘结-滑移模型,将预测值与试验值对比,该模型能较准确地反映硫酸盐干湿循环作用下界面粘结性能的退化规律。A double-sided shear test was carried out on the sintered clay brick block bonded with carbon fiber reinforced composite material(CFRP) to investigate the failure morphology and bonding properties of the CFRP-clay brick block interface under different sulfate dry-wet cycles, and the sulfate corrosion was discussed. Under the degradation mechanism of CFRP-clay brick interface bond performance, a bond strength degradation model is proposed. The results show that the failure morphology of the CFRP-clay brick block interface is greatly affected by the sulfate dry-wet cycle;the interface bonding properties(ultimate load-bearing capacity, peak shear stress) first slightly increase with the cycle time and then decrease rapidly. On this basis, according to the existing interface theory, a CFRP-clay brick block interface bond-slip model affected by the cycle time is proposed. The predicted value of the model is compared and analyzed with the experimental data. The model can accurately express the impact the law of degradation of interfacial bonding properties caused by sulphate dry-wet cycles.

关 键 词：硫酸盐 碳纤维布 黏土砖 界面 粘结-滑移关系 

分 类 号：TB332[一般工业技术—材料科学与工程]