Research On The Influence On Temperature And Loading Rate To Performance Of Hydraulic Asphaltic Concrete And Triaxial Unloading Test

Based on the current methods of hydraulic asphalt concrete mixing proportion test, a more conformable method by trabecular bending test has been explored to choose mixing proportion in this paper. In the design selection stage, it can save time, improve efficiency, and better reflect the hydraulic characteristics of asphalt concrete through the.trabecular bending test. Through 27 kinds of mixing proportion trabecular bending test under the conditions of 10 centigrade, mid-span loading rate of 1.67mm/min, the results reflect the influence law between hydraulic asphalt concrete performance and mix parameters.The temperature impact on the hydraulic properties of asphalt concrete is explored based on trabecular bending test in this paper. Testing program has a temperature range of-25 centigrade to 20 centigrade, the mid-span loading rate is 1.67mm/min. Hydraulic asphalt concrete flexural strength, maximum bending strain, bending modulus and bending strain energy through the test at different temperatures are obtained, the influence on temperature to these performance indexes are analyzed; And the landmark of the elastoplastic transformation to brittleness of hydraulic asphalt concrete is received; this landmark is the hydraulic asphalt concrete's brittleness point, its brittle point temperature is-15℃.In this paper the loading rate impact on the hydraulic properties of asphalt concrete based on trabecular bending test is studyed. Testing program in a fixed temperature, the mid-span loading rate is 0.83mm/min to 9.17mm/min. Hydraulic asphalt concrete flexural strength, maximum bending strain, bending modulus and bending strain energy through the test at different loading rate are obtained, the influence on loading rate to these performance indexes are analyzed.Based on static triaxial test, three kinds of static triaxial unloading test program have been proposed. Through the analysis of test results, a more reasonable method of static triaxial unloading is obtained, we can get the unloading test parameter Kur and nur, the relations between that and static triaxial test parameter K and n under the condition of this paper are obtained also, this providing a reference for future engineering applications.