Asphalt mixture mixed ratio design method based on shearing resistance performance

Abstract

The invention relates to an asphalt mixture mixed ratio design method based on the shearing resistance performance, which is characterized by comprising the following steps of: (1) determining the maximum shearing stress of a structure layer of the designed asphalt mixture; (2) entering a conventional target mixed ratio design stage; (3) determining the shearing resistance intensity of the asphalt mixture designed in the second step; (4) determining the allowable shearing stress of the asphalt mixture; and (5) verifying the shearing resistance performance. The method has the advantages that in the asphalt mixture mixed ratio design, the asphalt mixture shearing resistance design index is provided, the materials and the structure adopt the integral design, and the pertinence is strong. Under the condition of the heavy load traffic, the design load of the heavy load traffic can be determined, the standard load limitation can be broken through, the structural calculation is carried out, the maximum shearing stress of the pavement structure is determined, and the allowable shearing stress of the asphalt mixture is determined through the three-axis shearing tests and the structural analysis, so the designed asphalt mixture meets the requirements of the heavy load traffic and has good shearing resistance performance.

Description

(1) Technical field: [0001] The invention relates to a mixing ratio design method of an asphalt mixture, in particular to a mixing ratio design method of an asphalt mixture based on shear resistance. (2) Background technology: [0002] Rutting is one of the main damage types of asphalt pavement. Asphalt mixture needs to have good anti-rutting ability to meet the influence of vehicle load on the shear stress of pavement structure. "Specification for Design of Highway Asphalt Pavement" (JTG D50-2006) still limits the design index of pavement structure to the springback deflection value of road surface and the bottom tensile stress of each structural layer, and does not take shear stress as a design index and is applied to pavement Structural design, only in the design of the mixture, the dynamic stability value is proposed according to different climate zones and asphalt types. This index reflects the shear resistance of the asphalt mixture to a certain extent, but does not co...

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Problems solved by technology

"Code for Design of Highway Asphalt Pavement" (JTG D50-2006) still limits the design indicators of pavement structure to the rebound deflection value of the pavement surface and the tensile stress at the bottom of each structural layer. Shear stress is not used as a design indicator and applied to the pavement Structural design, only in the design of the mixture, the dynamic stability value is proposed according to different climate zones and asphalt types. This index reflects the shear resistance of the asphalt mixture to a certain extent, but does not include the shear performance of the mixture. Linked with the structural design, it cannot effectively control the shear stress of the asphalt layer under different pavement structures

[0003] At present, the commonly used asphalt mixture design method in China does not systematically use the mechanical method to evaluate the shear performance of asphalt mixture, and link it with the specific pavement structure, and put forward the shear design index to control the design life of asphalt pavement no shear failure

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