Study on the cohesion and adhesion of hot-poured crack sealants  

作　　者：Meng GUO Yiqiu TAN Xuesong DU Zhaofeng LV 

机构地区：[1]National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing, China [2]School of Transportation Science and Engineering, Harbin Institute of Technology, Harbin, China [3]Northeast Electric Power Design Institute Co., Ltd. of China Power Engineering Consulting Group, Chang Chun, China [4]Heilongjiang Zhongda Road & Bridge Group Co., Ltd., Harbin, China

出　　处：《Frontiers of Structural and Civil Engineering》2017年第3期353-359,共7页结构与土木工程前沿（英文版）

摘　　要：Filling crack sealant is a main method to repair cracking of pavement. The cohesion and adhesion of crack sealant directly determine its service performance and durability. However, the competitive mechanism of cohesion and adhesion failure modes is not clear currently. This research proposed two methods to evaluate cohesion and adhesion of crack sealant, and analyzed the influence of temperature on cohesion and adhesion. The effect of moisture on low- temperature performance of crack sealant was also be evaluated by conducting a soaking test. Results show that with the decrease of temperature, the cohesion force of crack sealant increases significantly, while the adhesion force changes little. There is a critical temperature at which the cohesion force equals the adhesion force. When the temperature is higher, the adhesion force will be greater than cohesion force, and the cohesion failure will happen more easily. In contrast, the adhesion failure will happen more easily when the temperature is lower than the critical value. Soaking in 25 ℃ water for 24-48 hours will slightly improve the low-temperature tension performance of crack sealant. However, soaking in 60 ℃ water for 24 hours will decrease the failure energy of low-temperature tension and damage the durability of crack sealant.Filling crack sealant is a main method to repair cracking of pavement. The cohesion and adhesion of crack sealant directly determine its service performance and durability. However, the competitive mechanism of cohesion and adhesion failure modes is not clear currently. This research proposed two methods to evaluate cohesion and adhesion of crack sealant, and analyzed the influence of temperature on cohesion and adhesion. The effect of moisture on low- temperature performance of crack sealant was also be evaluated by conducting a soaking test. Results show that with the decrease of temperature, the cohesion force of crack sealant increases significantly, while the adhesion force changes little. There is a critical temperature at which the cohesion force equals the adhesion force. When the temperature is higher, the adhesion force will be greater than cohesion force, and the cohesion failure will happen more easily. In contrast, the adhesion failure will happen more easily when the temperature is lower than the critical value. Soaking in 25 ℃ water for 24-48 hours will slightly improve the low-temperature tension performance of crack sealant. However, soaking in 60 ℃ water for 24 hours will decrease the failure energy of low-temperature tension and damage the durability of crack sealant.

关 键 词：crack sealant concrete pavement COHESION ADHESION moisture damage 

分 类 号：TQ436.6[化学工程] U418.66[交通运输工程—道路与铁道工程]