Authors: Yebo Fang; Yongbing Guan
Addresses: Department of Municipal Engineering and Equipment, Shandong Urban Construction Vocational College, Jinan 250103, China ' Jinan Engineering Polytechnic, Engineering Management College, Jinan 250200, China
Abstract: In order to overcome the problems of large error and high failure rate existing in the fracture test method of asphalt concrete materials, the dynamic tensile fracture test of semi flexible epoxy asphalt concrete materials was proposed. This method uses digital image technology (DIC) to measure the displacement of asphalt concrete crack propagation process, accurately capture the fracture process of asphalt concrete material crack tip, and use tensile test to evaluate the low temperature cracking performance of semi flexible pavement material. The experimental results show that when the loading wavelength is increased to 900 μs, the error of the maximum tensile stress calculation value is reduced to 7.5%. There is obvious size effect on the tensile strength of concrete. The safety risk assessment model has higher security guarantee. At the same time, the required capital investment is lower, and the test failure rate is always lower than 20%.
Keywords: semi flexible epoxy asphalt; concrete; digital image technology; DIC; tensile fracture.
International Journal of Materials and Product Technology, 2021 Vol.63 No.1/2, pp.33 - 47
Received: 10 Nov 2020
Accepted: 08 Jan 2021
Published online: 02 Aug 2021 *