硫酸盐侵蚀环境对CFRP-粘土砖界面粘结性能的影响  

Effect of sulfate erosion on the bonding performance of CFRP-clay brick interface

作　　者：聂丹 靳文强[2,3] 董磊 赵坤 张家玮[2,3] NIE Dan;JIN Wenqiang;DONG Lei;ZHAO Kun;ZHANG Jiawei(College of Civil Engineering and Architecture,Mianyang City College,Mianyang 621000,China;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)

机构地区：[1]绵阳城市学院建筑工程学院,绵阳621000 [2]兰州交通大学土木工程学院,兰州730070 [3]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

出　　处：《复合材料学报》2023年第9期5276-5287,共12页Acta Materiae Compositae Sinica

基　　金：甘肃省建设科技攻关项目(JKR2021-07)。

摘　　要：为探究硫酸盐浸泡环境下碳纤维增强复合材料(CFRP)-粘土砖界面粘结性能退化规律,试验采用质量分数为10wt%的硫酸盐溶液对CFRP-粘土砖试件进行加速腐蚀,并对材料性能进行测定,通过采集应变、承载力等参数,分析CFRP与粘土砖界面承载力能力与粘结强度变化规律。研究表明:硫酸浸泡对CFRP片材和树脂胶的力学性能无显著影响,但对粘土砖的抗压强度有明显影响,经过180天硫酸盐浸泡后,粘土砖抗压强度下降了34.50%。对于CFRP-粘土砖界面的极限承载力与粘结强度,研究发现CFRP的宽度对界面承载力和粘结强度均有影响,增加界面的宽度,可以增加界面的承载能力,但界面粘结强度会因此而下降,且粘结宽度越大,在硫酸盐持续浸泡作用下界面粘结性能退化越显著。在试验基础上引入硫酸盐综合影响系数,并对其采用两种不同方式进行计算,建立考虑硫酸盐浸泡影响的CFRP-粘土砖界面承载力关系模型,通过与试验值对比,本文提出的CFRP-粘土砖界面承载力能关系模型能够很好地预测硫酸盐持续浸泡对CFRP-粘土砖界面承载力退化情况。In order to investigate the degradation law of bonding performance of carbon fiber reinforced composite(CFRP)-clay brick interface under sulfate soaking environment,the test was conducted by accelerated corrosion of CFRP-clay brick specimens with 10wt%mass fraction of sulfate solution,and the material properties were measured,and the change law of bearing capacity and bonding strength of CFRP-clay brick interface was analyzed by collecting the parameters of strain and bearing capacity.The study shows that sulfuric acid immersion has no significant effect on the mechanical properties of CFRP sheet and resin adhesive,but has a significant effect on the compressive strength of clay brick,which decreases by 34.50%after 180 days sulfate immersion.For the ultimate bearing capacity and bond strength of CFRP-clay brick interface,it is found that the width of CFRP has an effect on both the bearing capacity and bond strength of the interface,increasing the width of the interface can increase the bearing capacity of the interface,but the bond strength of the interface will decrease as a result,and the larger the bond width is,the more significant the degradation of the bond performance of the interface under the effect of con-tinuous sulfate immersion.Based on the test,the comprehensive influence coefficient of sulfate is introduced and calculated in two different ways to establish the CFRP-clay brick interfacial bearing capacity relationship model considering the influence of continuous sulfate soaking.The model can predict the degradation of the CFRP-clay brick interface by continuous sulfate soaking.

关 键 词：硫酸盐环境 碳纤维增强树脂复合材料(CFRP)-粘土砖 单面剪切 极限承载力 粘结强度 

分 类 号：TU362[建筑科学—结构工程] TB333[一般工业技术—材料科学与工程]