Low-temperature failure modes of asphalt pavement seal system

In order to evaluate low temperature failure modes of asphalt pavement seal system, interfacial bond strength of sealant-asphalt mixture, low-temperature cracking resistance of asphalt mixture and low-temperature cracking resistance of sealant were studied by means of low-temperature bond test, direct extension test and cohesion test respectively. The results show that the peak stress of the asphalt mixture (4.02 MPa) is larger than the peak stress of the sealant (1.59 MPa), and the peak stress of the sealant (1.59 MPa) is larger than the interfacial bond strength (0.416 MPa). The critical strain of sealant (0.453) is much larger than the critical strain of the asphalt mixture (4.296×10^-3). Based on the results, it can be obtained that the probabilities of three kinds of low-temperature failure modes from high to low are adhesive failure, secondary cracking and cohesion failure. In the end, technical measures for the prevention of low-temperature failure from material selection, construction techniques and low temperature performance are proposed.