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

A technology of drawing test and aging asphalt, which is applied in the direction of measuring devices, instruments, and mechanical devices, etc., can solve the problems of different understanding and judgment of microboiling state, affect the test results, and be difficult to estimate accurately, etc. Less sample demand, accurate test effect

Inactive Publication Date: 2017-06-30
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

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Embodiment 1

[0024] A pull-out test method for ultraviolet light aging asphalt and asphalt mortar, which selects Shell 70# base asphalt and rubber asphalt as research objects, and specifically includes the following steps:

[0025] (1) Thermal aging of asphalt and asphalt mortar samples

[0026] Put the asphalt and asphalt mortar samples into the oven, and control the temperature of the oven to 163°C for 5 hours;

[0027] (2) UV aging of asphalt and asphalt mortar samples

[0028] Put the asphalt and asphalt mortar samples into a circular sample pan (r60mm), the thickness of the sample is 1mm, and the circular sample pan is divided into high strength (r=0~20mm) and medium strength (r=0~20mm) with the center of the circle as the center. r = 20 ~ 40mm), low intensity (r = 40 ~ 60mm) area, the highest ultraviolet light intensity is 400W / m 2 , the masses of asphalt and asphalt mortar were 1.31g, 3.66g, and 6.14g, respectively. A 125w reflective high-pressure mercury lamp is used as the ultr...

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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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N19/04
CPCG01N19/04
Inventor 武金婷叶奋王锋丁新慧
Owner TONGJI UNIV
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