Method for determining number of times of flowing deformation of high-temperature creep instability points of asphalt mixture

Abstract

The invention provides a method for determining the number of times of flowing deformation of high-temperature creep instability points of an asphalt mixture. The method comprises steps as follows: firstly, a shear strength parameter of the asphalt mixture and a shear stress value on a failure surface under the most unfavorable load effect are obtained through an unconfined compressive strength test and a uniaxial penetration test; the high-temperature deformation instability characteristic of the asphalt mixture is analyzed through a uniaxial dynamic creep curve of the asphalt mixture under the cyclic load effect at a certain stress level, and a third-stage instability point of the asphalt mixture and the corresponding number of times of flowing deformation are determined; finally, through five uniaxial dynamic creep tests under cyclic load effects at different stress levels, a quantitative relation, that is, a shear fatigue equation, between numbers of times of instability flowing deformation and shear stress levels on instability failure surfaces is established. With the adoption of the method, a pressure shear fatigue equation of any asphalt mixture can be obtained, so that the number FN of times of flowing deformation of high-temperature creep instability points of the corresponding asphalt mixture under the cyclic load effect at any stress level can be predicted.

Description

technical field [0001] The invention belongs to the field of road engineering, and in particular relates to a method for determining the rheological number of the high-temperature creep instability point of an asphalt mixture, which can be applied to the quantitative evaluation of the high-temperature performance of the asphalt mixture and the prediction of the development of rutting diseases on asphalt pavement. Background technique [0002] With the comprehensive influence of traffic volume increase, axle load increase, traffic channelization and continuous high temperature weather, rutting has become one of the main diseases of asphalt pavement in my country. According to past experience, rutting is prone to appear in areas such as urban roads and arterial road intersections, expressway sections with severe traffic channelization, and uphill sections of expressways. The generation of rutting will affect the smoothness of the road surface and driving comfort, reduce the ov...

AI Technical Summary

Problems solved by technology

The generation of rutting will affect the smoothness of the road surface and driving comfort, reduce the overall strength of the surface layer and the road surface structure, and also seriously endanger the driving safety

Images