基于表面能理论的粘结剂-UHPC粘结失效模式分析  

Failure Mode Analysis of Binders-UHPC Based on Surface Energy Theory

作　　者：李嘉[1,2] 肖鹏 范思源 周壹伍 LI Jia;XIAO Peng;FAN Siyuan;ZHOU Yiwu(College of Civil Engineering,Hunan University,Changsha 410082,China;Key Laboratory for Wind and Bridge Engineering of Hunan Province,Hunan University,Changsha 410082,China)

机构地区：[1]湖南大学土木工程学院,长沙410082 [2]湖南大学风工程与桥梁工程湖南省重点实验室,长沙410082

出　　处：《材料导报》2024年第14期131-137,共7页Materials Reports

基　　金：国家自然科学基金(52038003)。

摘　　要：为探究粘结剂与UHPC的潜在粘结失效模式及其机理,通过表面能理论建立粘结剂-UHPC的粘附模型和剥落模型,提出粘结失效模式判断准则。选择四种常用界面粘结剂(热熔型改性环氧树脂202、高粘高弹沥青(宝利)、高粘高弹沥青PG-100和SBS改性沥青)作为研究对象。采用接触角法测算UHPC、粘结材料的表面能参数,并计算粘结剂的内聚功和剥落功、粘结剂-UHPC的界面粘附功和界面剥落功,依据失效模式判断准则确定粘结剂-UHPC体系的粘结失效类型。研究结果表明:四种粘结剂-UHPC的界面粘附功排序为树脂202>高粘沥青>沥青PG-100>SBS改性沥青;粘结剂内聚功排序为树脂202>SBS改性沥青>沥青PG-100>高粘沥青。无水条件下,四种粘结剂-UHPC体系的粘结剂内聚功远小于界面粘附功,为粘结剂内聚失效,粘结剂内聚功与拉拔强度具有较强的线性相关性。有水条件下,粘结剂的剥落功大于界面剥落功,失效类型为粘结剂内聚失效。通过附着力拉拔试验以及已有研究成果,综合分析和验证判定结果的有效性。本研究为探明粘结剂-UHPC粘结失效机理、改进粘结材料配伍性具有理论与实际意义。To investigate the potential bond mechanism and failure mode between binders and UHPC,the adhesive model and spalling model of binder-UHPC were established through the surface energy theory.The guidelines for determining the bond failure mode were proposed.Four commonly used binders:the hot-melt modified epoxy resin 202,the high-viscoelastic asphalt(Bao Li),the high-viscoelastic asphalt PG-100,and the SBS(styrene butadiene styrene)-modified asphalt were selected as the objects of the study.The contact angle method was used to measure the surface energy parameters of UHPC and the binders.The cohesive work and spalling work of the binders,the interfacial adhesive work and spalling work of the binder-UHPC were calculated.Bond failure types of the binder-UHPC systems were determined according to the failure mode criterion.According to the test results,the interfacial adhesive work of the binder-UHPC systems was ranked as follows:the resin 202>the high viscosity asphalt>the asphalt PG-100>the SBS-modified asphalt.The cohesive work of the binders was ranked as follows:the resin 202>the SBS-modified asphalt>the asphalt PG-100>the high viscosity asphalt.Under the dry condition,the binder cohesive work was much smaller than the interfacial adhesive work of the binder-UHPC systems,indicating the cohesive failure of the binders.There is a strong linear correlation between pull-off strength and binder cohesive work.Under the presence of water,the binder spalling work was larger than the interfacial spalling work,and the failure type is cohesive failure of binder.The validity of the results were analyzed and verified using the pull-off test as well as existing research.This study has theoretical and practical implications for the investigation of binder-UHPC bond failure mechanism and the improvement of the compatibility of binders.

关 键 词：超高性能混凝土 粘结剂 表面能 失效模式 粘结性能 改性沥青 改性环氧树脂 

分 类 号：U443.3[建筑科学—桥梁与隧道工程]