Testing method for water stability differences of bituminous mixture after crushing coarse aggregates

A technology of asphalt mixture and testing method, applied in the direction of material inspection products, etc., can solve the problems of asphalt mixture performance change, affecting asphalt mixture performance and use quality, etc.

Inactive Publication Date: 2012-12-05
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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  • Testing method for water stability differences of bituminous mixture after crushing coarse aggregates
  • Testing method for water stability differences of bituminous mixture after crushing coarse aggregates
  • Testing method for water stability differences of bituminous mixture after crushing coarse aggregates

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1, Test of Asphalt Mixture Grading Variability after Coarse Aggregate Crushing

[0041] 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;

[0042] 2. At the construction site, 2kg of mixture was randomly selected from the auger of the paver, and the asphalt was separated from the mixture according to the test method T0722-1993 of "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" (JTJ052-2000) ;

[0043] 3. According to the "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" (JTJ052-2000) T0725-2000 test method, sieve the mixed minera...

Embodiment 2

[0048] Example 2, High temperature deformation resistance test of asphalt mixture after coarse aggregate crushing

[0049] 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;

[0050] 2. At the construction site, 6 core samples were randomly selected. First, the diameter, height and relative bulk density of the core samples were measured according to the test method T0705-2000 of "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" (JTJ052-2000) , the test results are shown in Table 1, and then, according to the test metho...

Embodiment 3

[0053] Example 3, Water Stability Test of Asphalt Mixture after Coarse Aggregate Crushing

[0054] 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;

[0055] 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;

[0056]3. According to the test m...

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Abstract

The invention discloses a testing method for water stability differences of a bituminous mixture after crushing coarse aggregates and solves the technical problem that the testing method is utilized to evaluate differences of performances of the bituminous mixture before and after crushing the coarse aggregates. The testing method provided by the invention comprises the following steps of: extracting 8-12 paved and ground cylindrical core samples from a bituminous pavement construction site, and placing a first group of test samples on a platform; enabling a second group of test samples to saturate water under a vacuum condition, placing the second group of test samples in ordinary pressure water, taking out the test samples into a plastic bag, adding water, freezing the test samples in a constant temperature refrigerator, and then placing the test samples into a constant temperature water tank so as to carry out heat preservation after being taken out; immersing all the test samples into the constant temperature water tank; carrying out a diametral compression test for the test samples by a loading rate, and obtaining two groups of splitting strength; and obtaining a freeze-thaw split ratio. Compared with the prior art, the water stability differences of the bituminous mixture before and after crushing the coarse aggregates are tested in a construction process, so that a problem of evaluating the water stability differences of the bituminous mixture before and after crushing the coarse aggregates is solved.

Description

[0001] This application is a divisional application of 200910105919.6. The filing date of the original application is March 2, 2009, and the application number is 200910105919.6. The invention name is a test method for asphalt mixing performance after coarse aggregate crushing. technical field [0002] The invention relates to a method for testing the properties of road construction materials in highway engineering, in particular to a method for testing the water stability difference of asphalt mixture after coarse aggregate is crushed due to raw material selection or construction technology. Background technique [0003] 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 specifica...

Claims

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Application Information

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IPC IPC(8): G01N33/38
Inventor 葛折圣苏军高俊合邓彬
Owner SHENZHEN MUNICIPAL ENG
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