外部粘贴CFRP-ECC粘结性能的影响因素试验  

Test of factors affecting bonding performance of externally bonded CFRP-ECC

作　　者：丛龙宇 张方[1] 钱永久[1] CONG Longyu;ZHANG Fang;QIAN Yongjiu(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学土木工程学院,成都610031

出　　处：《复合材料学报》2025年第3期1538-1554,共17页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(51778532);中国工程院重点咨询项目(2015-05-ZD-002)。

摘　　要：外部粘贴碳纤维增强聚合物(CFRP)的加固方法常常由于CFRP的过早脱粘而造成加固效果不佳。在CFRP与混凝土之间设置一层工程水泥基复合材料(ECC)能够改善这一状况。为研究外部粘贴CFRP-ECC粘结性能的影响因素,对20个试件进行双剪试验,考虑的因素包括ECC表面是否打磨、ECC拉伸强度、CFRP宽度、厚度、粘贴长度、粘结层剪切模量等。结果表明:ECC表面打磨对粘结关系有显著影响,打磨组试件的极限载荷提高了58.34%至101.44%。增加CFRP的厚度是提高CFRP-ECC粘结性能的一项非常有效的方法,将CFRP的厚度从0.127 mm增加到0.217 mm后,极限载荷提高了54.34%。将ECC的抗拉强度从0.8 MPa提高到2.8 MPa后,极限载荷增加了25.40%。当抗拉强度超过2.8 MPa时,由于ECC的强度较高,ECC中持力长度变短,导致有效粘结长度减少,最终导致极限载荷降低。此外,粘结层剪切模量对粘结关系的影响较小。The reinforcement method of externally applied carbon fiber reinforced polymer(CFRP)is often ineffective due to premature debonding of CFRP.This situation can be improved by placing a layer of engineered cementitious composite(ECC)between CFRP and concrete.In order to investigate the factors affecting the bond performance of externally applied CFRP-ECC,twenty specimens were subjected to double shear tests,and the factors considered included whether the ECC surface was polished or not,the tensile strength of ECC,the width and thickness of CFRP,the length of adhesion,and the shear modulus of the adhesive layer,etc.The results show that the ECC surface is not polished,and the ECC is not polished.The results show that ECC surface sanding has a significant effect on the bond relationship,and the ultimate loads of the sanded group of specimens increase by 58.34%to 101.44%.Increasing the thickness of CFRP is a very effective way to improve the bonding performance of CFRP-ECC.Increasing the thickness of CFRP from 0.127 mm to 0.217 mm increases the ultimate load by 54.34%.Increasing the tensile strength of ECC from 0.8 MPa to 2.8 MPa increases the ultimate load by 25.40%.When the tensile strength exceeds 2.8 MPa,the holding length in the ECC becomes shorter due to the higher strength of the ECC,which leads to the reduction of the effective bond length,and ultimately leads to the reduction of the ultimate load.In addition,the shear modulus of the bond layer has a small effect on the bond relationship.

关 键 词：ECC CFRP 双剪试验 粘结性能 参数敏感性分析 

分 类 号：U445.6[建筑科学—桥梁与隧道工程] TB332[交通运输工程—道路与铁道工程]