Ultraviolet aging test method for asphalt with control group

An aging test and control test technology, applied in measuring devices, instruments, scientific instruments, etc., can solve the problems that affect the test progress, affect the authenticity of test data results, and the asphalt sample cannot be evenly washed by water, etc., and achieve comprehensive reliability. The effect of evaluation

Pending Publication Date: 2022-03-25
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The photoaging of asphalt includes thermo-oxidative aging and ultraviolet aging. In order to reduce the influence of thermo-oxidative aging on the simulation results of asphalt ultraviolet aging, and to study the influence of a single ultraviolet factor on asphalt aging, the current ultraviolet aging simulation equipment and methods are limited to temperature control or Oxygen barrier
The equipment needs external heating, cooling, and vacuum equipment, and the structure is often complicated
[0004] In the existing asphalt ultraviolet aging device, in order to ensure that the asphalt sample is evenly irradiated by ultraviolet rays, the ultraviolet lamp is located directly above the asphalt sample. In order to prevent the spray head from blocking the ultraviolet light, the spray head is generally located on the side of the ultraviolet lamp, or On the side, the asphalt sample cannot be evenly washed by water, which affects the authenticity of the test data results
[0005] In the existing asphalt UV aging device, most of the stage is directly fixed on the lower part of the inner side of the asphalt UV aging box, and the distance between the UV lamp and the asphalt sample cannot be adjusted.
There are also devices that drive the stage or ultraviolet lamp to move up and down through the motor, but due to the influence of temperature and humidity in the box, it is easy to cause equipment failure and affect the test.

Method used

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  • Ultraviolet aging test method for asphalt with control group
  • Ultraviolet aging test method for asphalt with control group
  • Ultraviolet aging test method for asphalt with control group

Examples

Experimental program
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Embodiment 1

[0038] Example 1, such as figure 1 As shown, the invention provides a kind of asphalt ultraviolet aging test method that has control group, specifically comprises the following steps:

[0039] Step S1: First prepare multiple asphalt specimens, first pour the mixed asphalt into a circular tray to form a mold, and then divide the molded asphalt specimens into two groups on average, one group is the asphalt UV aging test group, and the other The group is the asphalt aging control test group. In this embodiment, 18 asphalt specimens were prepared, which were equally divided into two groups of 9 specimens, which were used for the ultraviolet aging test and the control test respectively. The asphalt specimen is a cylinder with a height of 30 mm and a diameter of 80 mm.

[0040]Step S2: Put two groups of asphalt test pieces into the corresponding test area in the test box 8, specifically, the interior of the test box 8 is divided into two asphalt samples arranged side by side by th...

Embodiment 2

[0049] Embodiment 2, a kind of asphalt ultraviolet aging test method that has control group, differs from embodiment 1 in that: in described step S2, the operating steps when two groups of asphalt specimens carry out comparative test during aging process include: Keep the test environment in the asphalt UV aging test area unchanged, and install a filter glass 10 above the inside of the asphalt aging control test area. Specifically, the filter glass 10 is set on the upper right side of the partition 4, and one end of the filter glass 10 On the top of the partition 4, the other end is detachably installed on the support rod 16 on the right side, so as to facilitate the removal and installation of the filter glass 10 during the test. The filter glass 10 is used for isolating the ultraviolet rays emitted by the high-pressure mercury lamp 3, and is used for test comparison. Then during the test, the high-pressure mercury lamp 3 was turned on, and steps S3 and S4 were repeated, and ...

Embodiment 3

[0051] Embodiment 3, a kind of asphalt ultraviolet aging test method with control group, differs from embodiment 1, 2 in that: in said step S2, the operating steps when two groups of asphalt test pieces are compared in the aging process Including: adjusting the distance between the two sets of loading discs 6 and the high-pressure mercury lamp 3 by rotating the nuts 21 under the two sets of loading discs 6, wherein the asphalt specimens of the asphalt ultraviolet aging test group and the high-pressure mercury lamp 3 The distance between them is adjusted to 50mm-70mm, and the distance between the asphalt specimens of the asphalt aging control test group and the high-pressure mercury lamp 3 is adjusted to 80mm-100mm. Then turn on the high-pressure mercury lamp 3, and repeat steps S3 and S4 to test and compare the influence of different ultraviolet irradiation heights on the ultraviolet aging performance of asphalt under the same temperature, humidity and infrared irradiation cond...

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Abstract

The invention provides an ultraviolet aging test method for asphalt with a control group. The ultraviolet aging test method comprises the following steps: preparing an asphalt test piece, putting the asphalt test piece into a test box body for an aging comparison test, taking out the tested asphalt test piece, testing, evaluating the anti-ultraviolet aging performance of the asphalt and the like. According to the invention, the influence of rain wash and ultraviolet on asphalt aging can be simulated, and the influence degree of thermal oxidation and ultraviolet on asphalt aging can be contrasted and researched under the condition of keeping the temperature and humidity in the whole test box body to be the same; the influence of different ultraviolet heights on asphalt aging can be simulated by adjusting the height of the loading disc; according to the method, detailed, sufficient and accurate contrast data are provided for the asphalt ultraviolet aging test, the residual penetration ratio, the ductility retention rate and the viscosity aging index are used as evaluation indexes, and the anti-ultraviolet aging performance of asphalt is evaluated more comprehensively and reliably.

Description

technical field [0001] The invention relates to the technical simulation field of asphalt aging, in particular to an asphalt ultraviolet aging test method with a control group. Background technique [0002] With the wide application of asphalt pavement in our country and the destruction of the ozone layer caused by environmental pollution, the aging problem of asphalt pavement has become increasingly prominent. There are many factors affecting asphalt aging. Asphalt aging occurs in the process of asphalt storage, transportation, preparation and later road use, while heating, oxygen, light and water have the greatest impact on asphalt aging, especially under the action of strong ultraviolet rays. Gradually becoming brittle and less adhesive, leading to a sharp decline in the low-temperature performance and water stability of asphalt mixtures, so the UV aging resistance of asphalt must be simulated before it is used in pavement. [0003] The photoaging of asphalt includes the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N17/00
CPCG01N17/00G01N17/004
Inventor 乐金朝王日冉徐胜堂陈良福赵惊梅陈巍沙天宇
Owner ZHENGZHOU UNIV
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