Crack sealing is one of the most common treatments for asphalt pavement preventive maintenance. Proper crack sealing is supposed to prolong the service life of the road for 3 to 5 years. But in some cold area in China, most kinds of crack sealant failed 1 year after it was installed. How to evaluate the low temperature performance of crack sealant is a critical issue in cold area in China. Therefore, the prospective of this paper is to develop an effective crack sealant testing device. Firstly, a new low-temperature performance testing device of asphalt pavement crack sealant (called “the Device”) was developed. The Device has high test efficiency and precision, low test resistance of the loading system and allows three parallel specimens. The Device consists of four parts: the loading system, the power system, the temperature controlling system and the data collecting system. Two types of specimens were designed to test the adhesive and cohesive properties respectively. The data collecting system can collect the stress and deformation data of crack sealant in the real time. Secondly, the influence of loading rate, temperature and specimen size on low-temperature performance of crack sealant was investigated. The results show that the specimen size of 2.4cm×2.4cm(width×depth) is proper considering the rubber crumbs effect. The failure deformation approaches the minimum value at the rate of 100mm/h. The sealant specimen is very sensitive to temperature when the temperature is below -20°C.
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