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Test method of performance of asphalt mixture after crushing coarse aggregates

A technology of asphalt mixture and anti-cracking performance, applied in the direction of using stable shear force to test material strength, measuring device, specific gravity measurement, etc., can solve the performance change of asphalt mixture, affect the performance and quality of asphalt mixture, etc question

Active Publication Date: 2013-05-15
SHENZHEN MUNICIPAL ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after the coarse aggregate is crushed, the performance of asphalt mixture has changed significantly, which seriously affects the performance and service quality of asphalt mixture, so new requirements are put forward for the test of asphalt mixture

Method used

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  • Test method of performance of asphalt mixture after crushing coarse aggregates
  • Test method of performance of asphalt mixture after crushing coarse aggregates
  • Test method of performance of asphalt mixture after crushing coarse aggregates

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1, Test of Asphalt Mixture Grading Variability after Coarse Aggregate Crushing

[0040] 1. AC-20C asphalt mixture is used in the surface layer of a highway, the crushing value of limestone coarse aggregate is 24%, and the content of needle flake particles is 16%, all of which meet the "Technical Specifications for Construction of Highway Asphalt Pavement" (JTGF40-2004) Table 4.8.2 has technical requirements for the quality of coarse aggregate for asphalt mixture, which is close to the upper limit of the allowable range;

[0041] 2. At the construction site, 2kg of mixture was randomly selected from the auger of the paver, and separated from the mixture according to the test method T0722-1993 of "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" (JTJ 052-2000) asphalt;

[0042] 3. According to the "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" (JTJ 052-2000) T0725-2000 test method, sieve the mixed mineral mater...

Embodiment 2

[0046] Example 2, High temperature deformation resistance test of asphalt mixture after coarse aggregate crushing

[0047] 1. AC-20C asphalt mixture is used in the surface layer of a certain expressway that is the same as Example 1. The crushing value of limestone coarse aggregate is 24%, and the content of needle-like particles is 16%, all of which meet the requirements of "Highway Asphalt Table 4.8.2 of Technical Specifications for Pavement Construction (JTGF40-2004) has technical requirements for the quality of coarse aggregate for asphalt mixture, which is close to the upper limit of the allowable range;

[0048] 2. At the construction site, 6 core samples were randomly selected. First, the diameter, height and gross volume of the core samples were measured according to the test method T0705-2000 of "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" (JTJ 052-2000). Density, the test results are shown in Table 1, and then, according to the test metho...

Embodiment 3

[0051] Example 3, Water Stability Test of Asphalt Mixture after Coarse Aggregate Crushing

[0052] 1. AC-20C asphalt mixture is used in the surface layer of a certain expressway that is the same as Example 1. The crushing value of limestone coarse aggregate is 24%, and the content of needle-like particles is 16%, all of which meet the requirements of "Highway Asphalt Table 4.8.2 of Technical Specifications for Pavement Construction (JTGF40-2004) has technical requirements for the quality of coarse aggregate for asphalt mixture, which is close to the upper limit of the allowable range;

[0053] 2. At the construction site, 12 mid-surface core samples were randomly selected, and the diameter D and height h of the samples were measured. The test results are shown in Table 3. The samples were randomly divided into 2 groups, 6 in each group, and the first The group of samples is placed on the platform and stored at room temperature for later use;

[0054] 3. According to the test ...

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Abstract

The invention discloses a test method of low temperature anti-cracking property of asphalt mixture after crushing coarse aggregates, aiming at solving the technical problem of evaluating the difference of the performance of the asphalt mixture before and after crushing the coarse aggregates. The test method of the invention comprises the following steps: extracting 4-6 core samples from the construction site of asphalt pavement, determining the relative density of the core sample bulk volume, loading the speed for crack test, obtaining various crack strength of the samples; extracting the mixture with the same batch and type as the construction site, heating to a site paving temperature in an oven, molding 4-6 specimens, removing the cores of the specimens and cutting the specimens into cylindrical indoor specimens with size the same as the site core sample, loading the speed for the crack test, obtaining the crack strength of the samples; and calculating the crack strength ratio of the site and indoor. Compared with the prior art, the method tests the difference of low temperature anti-cracking property of the asphalt mixture before and after crushing the coarse aggregates in the mixture, and solves the problem of difference evaluation of the performance of the asphalt mixture before and after crushing the coarse aggregates.

Description

technical field [0001] The invention relates to a method for testing the performance of road construction materials in highway engineering, in particular to a method for testing the low-temperature cracking resistance of asphalt mixture after coarse aggregate is crushed due to raw material selection or construction technology. Background technique [0002] The current "Highway Engineering Asphalt and Asphalt Mixture Test Regulations" (JTJ 052-2000), "Technical Specifications for Construction of Highway Asphalt Pavement" (JTGF40-2004), "Code for Design of Highway Asphalt Pavement" (JTGD50-2006), "Highway Engineering Quality Inspection and Evaluation Standards (JTGF80-2004) and other relevant technical specifications (regulations) do not involve the evaluation method of the performance of asphalt mixture after the coarse aggregate is crushed during construction. However, after the coarse aggregate is crushed, the performance of asphalt mixture has changed significantly, which ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/38G01N3/24G01N9/00
Inventor 葛折圣苏军高俊合邓彬
Owner SHENZHEN MUNICIPAL ENG
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