Coarse aggregate injection test device and coarse aggregate injection test method based on asphalt mixture tester

Abstract

The invention discloses a coarse aggregate injection test device and a coarse aggregate injection test method based on an asphalt mixture tester. A coarse aggregate sample is formed through a sample containing barrel by a tamping method; the sample containing barrel is arranged on a lifting base of an asphalt mixture Marshall tester; a connecting rod and an injection head are fixed on the upper part of the asphalt mixture Marshall tester; with a fixed displacement sensor and the turned-on asphalt mixture Marshall tester, the injection head injects aggregate at a speed of 5mm/min, the instrument automatically records the injection depth and injection force, and the injection load at the injection depth of 9mm is used as an evaluation index for the coarse aggregate skeleton strength. According to the device and the method disclosed by the invention, the bearing performance of coarse aggregate can be evaluated and a basis is provided for the optimal design of coarse aggregate grading, so that the high-temperature rutting resistance of the asphalt mixture can be estimated; moreover, the effectiveness of the mixture grading design can be improved while the rutting resistance of the asphalt mixture is enhanced; the device and the method have relatively high popularization and application values.

Description

technical field [0001] The invention belongs to the technical field of asphalt mixture gradation design, and in particular relates to a coarse aggregate penetration test device and method based on an asphalt mixture Marshall tester. Background technique [0002] At present, my country's "Code for Design of Highway Asphalt Pavement" only stipulates the upper and lower limits of asphalt mixture gradation, and there is no specific method for gradation design, resulting in randomness and blindness in gradation design in engineering. Although it is expected to design an asphalt mixture with a dense skeleton, there is a lack of suitable means to evaluate whether the skeleton is formed and how strong the skeleton is. [0003] In some projects, the calculation method is used to design the skeletal aggregate gradation, such as the Bailey method, etc., but in the face of complex and changeable aggregate characteristics, such as angularity, surface structure, material, etc., the calcul...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a coarse aggregate penetration test device and method based on the asphalt mixture Marshall tester, aiming to solve the problem that the current aggregate skeleton design method based on the evaluation of the mechanical performance is poor in generalization, and the test conditions are not considered. full question

Images