Performance Evaluation of Asphalt-Pavement Crack-Repair Materials

Based on the requirements for asphalt pavement crack repair materials, five representative materials were selected for testing: type-A crack sealant, type-B crack sealant, 70# hot asphalt, SBS-modified asphalt, and ambient-temperature water-based crack filler. A series of material performance and pavement performance experiments were conducted on these materials. Additionally, numerical models were developed based on actual asphalt pavement crack repair structural conditions. Under the ambient temperatures of 0 °C, 20 °C, and 50 °C, considering two types of loads, namely static load and dynamic load, the shear stress, tensile stress, and compressive stress of the crack-repair structure were analyzed in detail. The stress state of the repaired structure was specifically examined under the most unfavorable load conditions. These analyses were validated by comparing with laboratory-measured stress data, providing important references for the application of asphalt pavement repair materials. The conclusion of the research indicates that the B-type grouting adhesive, as a special material for crack repair, has obvious advantages in shear and tensile strength, and its overall performance is the best. It is suitable for expressways, first-class roads, and urban expressways. Asphalt materials for heating construction have obvious economic advantages compared with special materials and are suitable for low-grade asphalt pavement with relatively small pressure and small traffic volume on highways, branch roads, and secondary roads. Normal-temperature construction is suitable for temporary repair under adverse conditions such as cracks and dampness after rain.