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

• Published in: Frontiers of Structural and Civil Engineering 2017-09, Vol.11 (3), p.353-359
• Main Authors: GUO, Meng, TAN, Yiqiu, DU, Xuesong, LV, Zhaofeng
• Format: Article
• Language: English
• Subjects: Adhesion; Adhesion tests; Cities; Civil Engineering; Cohesion; concrete pavement; Countries; crack sealant; Cracking (fracturing); Critical temperature; Durability; Engineering; Failure modes; Fracture mechanics; Low temperature; moisture damage; Regions; Research Article; Sealants; Sealing compounds; Soaking; Temperature effects; 临界温度; 低温拉伸性能; 凝聚力; 密封胶; 浸水试验; 粘合; 粘接性能; 路面裂缝
• ISSN: 2095-2430; 2095-2449
• DOI: 10.1007/s11709-017-0400-3

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.