Study on the Change Law of Interfacial Bond Strength Between Asphalt and Aggregate Under the Influence of Salt Freezing and Water Immersion

Abstract

In order to study the interfacial bond strength of asphalt aggregate under immersion and salt freezing conditions, the influence of immersion time, freeze-thaw cycles and salt concentration on the interfacial bond strength under different temperature conditions was discussed. The orthogonal test was used to determine the mass of the sample after the freeze-thaw cycle, and the water absorption rate was obtained. The influence of soaking time, freeze-thaw cycle times and salt concentration on the water absorption rate was studied by range analysis method. The self-designed drawing test device was used to obtain the stress change of each sample during tensile test at room temperature, so as to achieve tensile failure After that, the range analysis method is still used to deal with the test data. According to the test results, the influence of the above three factors on the interfacial bond strength at different temperatures is qualitatively analyzed. The results show that: under the action of immersion and salt freezing, the interfacial bond strength decreases significantly, and the asphalt aggregate specimen is more sensitive to the change of perceived temperature. When the environmental temperature of the specimen changes, the bond strength fluctuates obviously; under the influence of three factors, the salt concentration has a greater impact on the water absorption and interfacial strength of the specimen than the other two factors. Therefore, in engineering application, we should attach great importance to this problem. And through this research, it provides reference for similar engineering construction and related research.