Method for performing pull-off test on ultraviolet-aged asphalt and asphalt mortar

Abstract

The invention relates to a method for performing a pull-off test on ultraviolet-aged asphalt and asphalt mortar. The method comprises the following specific steps: (1) thermally aging an asphalt and asphalt mortar sample; (2) performing ultraviolet aging on the asphalt and asphalt mortar sample; (3) performing the pull-off test by using a pull-off tester: selecting a square rock block as an aggregate, pouring the asphalt and asphalt mortar sample onto the surface of the square rock block, then placing a puller, and performing the pull-off test after the puller and the asphalt and asphalt mortar are adhered while standing. Compared with the prior art, the method has the advantages as follows: before the pull-off test, thermal aging and ultraviolet aging are performed first, thermal aging simulates the thermal aging process in the mixing, transporting and paving processes of the asphalt and asphalt mortar, ultraviolet aging simulates change of an asphalt pavement after actual irradiation and is closer to the actual situation, quantitative operation is achieved in each step, and accurate calculation and analysis can be performed to ensure the testing accuracy.

Description

technical field [0001] The invention belongs to the field of highways and urban roads, and in particular relates to a drawing test method for ultraviolet aging asphalt and asphalt mortar. Background technique [0002] The strength of the interface phase formed between asphalt and aggregate is a key factor affecting the quality and stability of asphalt mixture. The decrease in the interface strength between asphalt and aggregate will lead to asphalt peeling off from the surface of the aggregate and cause failure. The main failure modes are: cohesion failure, that is, Cohesion failure. The fracture surface is generated inside the asphalt. Due to the excessive amount of asphalt Caused by external force; Adhesion failure, that is, Adhesion failure, the fracture failure surface is generated at the interface between asphalt and aggregate, resulting in the reduction or even loss of the adhesion between asphalt and aggregate. In the presence of water, since water is more likely to ...

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Problems solved by technology

[0003] At present, in the existing domestic standards, the adhesion tests between asphalt and aggregates mainly include boiling method and water immersion method, etc., but there are many defects: it is only qualitative analysis rather than quantitative analysis; the test skills are not easy to master, and for micro The understanding and judgment of the boiling state vary from person to person; the percentage of peeling area by visual inspection is only subjective, and it is difficult to estimate accurately

Youutcheff et al. found in the drawing test that the thickness of the asphalt film greatly affects the test results. In order to control the thickness of the asphalt film, Φ200um glass beads were mixed with hot asphalt at a dosage of 1%, but this affected the uniformity of the asphalt system. , does not match the actual situation

Kanitpong et al placed the aluminum head on two metal support blocks (or frames) with a height difference to replace the glass bead method, but the high temperature fluidity of the asphalt makes the control of the asphalt film thickness poor

At present, there is no effective method for the determination of the interfacial phase strength between asphalt and aggregates, especially the existing test methods cannot truly reflect the adhesion between asphalt and aggregates, and the test methods are complicated and inconvenient to operate

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