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Method for evaluating crack resistance of regeneration asphalt mixtures based on uniaxial penetration experiment

A technology of asphalt mixture and recycled asphalt, which is applied in the direction of applying stable tension/pressure to test the strength of materials, analyzing materials, strength characteristics, etc., which can solve the difficulty of controlling the width of the central groove of semicircular test pieces and the large variability of test results , increase test costs and other issues, to achieve the effect of easy to master and implement, easy to promote, and stable test results

Active Publication Date: 2018-12-14
SHANDONG TRAFFIC PLANNING DESIGN INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to manufacture asphalt mixture specimens in the SCB test, especially the width of the central groove of the semicircular specimen is not easy to control, so that there is a large variability in the test results, and the cutting saw blades for processing the specimens also require Special customization increases the test cost

Method used

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  • Method for evaluating crack resistance of regeneration asphalt mixtures based on uniaxial penetration experiment
  • Method for evaluating crack resistance of regeneration asphalt mixtures based on uniaxial penetration experiment
  • Method for evaluating crack resistance of regeneration asphalt mixtures based on uniaxial penetration experiment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] (1) Using the rotational compaction molding method, at least 3 parallel test pieces are formed, the size of which is: height and diameter are both 100mm;

[0074] (2) Control the temperature of the test piece and the indenter in a 25℃ temperature control box to ensure that the heat preservation time of the test piece is more than 4 hours;

[0075] (3) The uniaxial penetration test is carried out with a press, and an indenter with a diameter of 28.5mm is used to ensure that the indenter position is centered. The test temperature is 25°C, the loading rate is 1mm / min, and the load is completely destroyed. During the collection test The curve of pressure and displacement.

[0076] (4) Analyze the collected data and fit the equation from the test data to find the slope m of the tangent at the inflection point after the peak of the test curve, and calculate the work w done at the inflection point after the penetration force from the beginning to the peak. f , The work done w f Divid...

Embodiment 2

[0092] Uniaxial penetration test such as figure 1 , Is to press a circular indenter on the cylindrical asphalt mixture sample. The size of the cylindrical sample is 100mm in height, 100mm in diameter, and 28.5mm in diameter. The load and displacement curves of the test are collected. The failure inflection point of the load curve is selected as the penetration strength of the specimen undergoing shear failure, and then the shear strength of the asphalt mixture is calculated.

[0093] In order to verify the feasibility of evaluating the anti-cracking performance of asphalt mixture through uniaxial penetration test at 25℃, this application conducts three-dimensional finite element analysis on the semicircular bending test and uniaxial penetration test force model, and the material properties of two models are set Similarly, the material is a linear elastic body, Poisson's ratio μ=0.3, and elastic modulus E=1000Mpa. The size of the semicircular specimen is 150mm in diameter and 50m...

Embodiment 3

[0097] According to the current domestic standard requirements "Technical Specification for Highway Asphalt Pavement Recycling" (JTG F41-2008), the hot-mix asphalt mixture design method is referred to the target mixture ratio design method for hot-mix asphalt mixture design.

[0098] 3.1 Determination of the properties of RAP material

[0099] 3.1.1 Determination of old asphalt content

[0100] RAP material is a waste asphalt mixture recovered from a mixing plant in Zhangqiu, Jinan. Before extracting the RAP material, the RAP material is first screened and processed. After the old material is crushed by the crusher of the mixing station, it is divided into three grades of 0-5mm, 5-10mm, 10-15mm, and 0-10mm. .

[0101] After centrifugal extraction of the third grade RAP material, the test results are shown in Table 1.

[0102] Table 1 Asphalt content results of three grades of RAP materials

[0103]

[0104] 3.1.2 Determination of the properties of old asphalt

[0105] Rotary evaporator ...

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Abstract

The invention relates to a method for evaluating crack resistance of asphalt mixtures based on uniaxial penetration experiment. The method comprises the following steps: performing the uniaxial penetration experiment on regeneration asphalt mixture test pieces, collecting test data of pressure and displacement, drawing a curve matching with the test data, and calculating a penetration index DI; and according to the penetration index, evaluating the crack resistance of regeneration asphalt mixtures, wherein the evaluation criterion includes that between 0-10, the larger the DI is, the better the crack resistance of the regeneration asphalt mixtures is, and the smaller the DI is, the worse the crack resistance of the regeneration asphalt mixtures is. In the practical evaluation course, the penetration index is calculated directly by using the curve of a uniaxial penetration experiment model to evaluate the crack resistance of the regeneration asphalt mixtures. Test pieces used in the evaluation method provided by the invention are easy to prepare, the test course is simple, the testing result is stable, the variability is small, and the method is easy for test operators to control and implement.

Description

Technical field [0001] The invention belongs to the field of evaluation of mechanical properties of asphalt mixtures, and in particular relates to a method for evaluating the crack resistance of recycled asphalt mixtures based on a uniaxial penetration test. Background technique [0002] According to estimates by relevant departments, at present, about 12% of asphalt pavements in my country need to be maintained and repaired on a large scale each year. The amount of waste asphalt mixture produced during this period will reach 20 million tons, and this amount will be 15% annually. Therefore, 10 years later, the amount of waste asphalt mixture produced by asphalt pavement maintenance in my country will exceed 80 million tons every year. Therefore, realizing the efficient recycling of old asphalt mixtures, reducing the environmental pollution of solid waste, and realizing the strategic goals of saving resources and improving public economic benefits have become major problems faced b...

Claims

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Application Information

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IPC IPC(8): G01N3/08
CPCG01N3/08G01N2203/0019G01N2203/0062Y02W30/91
Inventor 毕玉峰于大海马川义丁婷婷王健庄伟陈昊
Owner SHANDONG TRAFFIC PLANNING DESIGN INST
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