Quantitative testing method for microscopic strengths of mixture-mineral aggregate contact surfaces

Abstract

The invention discloses a quantitative testing method for the microscopic strengths of mixture-mineral aggregate contact surfaces. The quantitative testing method comprises the following steps of: reading a stretching or shear failure load; calculating an adhesion failure region area, a bonding failure region area and a mineral aggregate contact surface area on the contact surface of a mineral aggregate test model; within a thick-layer oil film scope, testing and analyzing the fundamental relation between the bonding strength of a bonding material and the thickness of the oil film, and calculating the bonding strength of the bonding material under the conditions of a thin-layer oil film and a medium-thick-layer oil film; and then calculating the overall stretching or shearing strength of the contact surface of the mineral aggregate test model, the stretching or shearing adhesion strength of the surfaces of asphalt and the mineral aggregate and the stretching or shearing bonding strength of the asphalt bonding material. The quantitative testing method for the microscopic strengths of the mixture-mineral aggregate contact surfaces provided by the invention realizes quantitative tests on the microscopic strengths including the adhesion strength between the asphalt and the mineral aggregate, the bonding strength of the asphalt bonding material and the overall strength of the mineral aggregate contact surface at different temperatures and different mechanical effects (stretching effect and shearing effect).

Description

technical field [0001] The invention belongs to the technical field of testing the adhesion between asphalt and mineral material, and in particular relates to a quantitative test method for the mesoscopic strength of the contact surface of a mixture of mineral material. Background technique [0002] The water boiling method is currently the most direct test method in China to test the adhesion of asphalt to the surface of coarse mineral materials larger than 13.2 millimeters (mm), and to evaluate the ability of coarse mineral materials to resist water stripping. The method is specifically as follows: put the mineral material coated with asphalt oil film in water that is kept in a slightly boiling state, soak for 3 minutes (min), then take the mineral material out of the water, observe the peeling degree of the asphalt oil film on the mineral material particles, and According to Table 1, evaluate its adhesion level. [0003] Table 1 Adhesion grades of asphalt and mineral agg...

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Problems solved by technology

[0005] This water boiling method in the prior art mainly has the following defects, (1) the test technique is not easy to master, and the understanding and grasp of the micro-boiling state of water varies from person to person; (2) the stripping area of ​​asphalt adopts the mode of visual inspection It is difficult to accurately estimate the asphalt peeling area, and the test results are highly subjective; (3) Due to the relationship between the adhesion strength between the asphalt mineral materials and the thickness of the oil film, temperature (high temperature and low temperature) and the type of load effect on the contact surface of the mineral materials There is an obvious relationship between them, and the bonding effect of adjacent mineral materials in the mixture is not only related to the adhesive strength between asphalt mineral materials, but also related to the bonding strength of asphalt itself.

Therefore, the quantitative test of the mesoscopic strength of the contact surface in the above various states, including the adhesion strength between asphalt and mineral materials and the self-bonding strength of asphalt binder, cannot be achieved by using the boiling method.

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