Method for testing high-temperature performance difference of asphalt mixtures after crushing of coarse aggregates

A technology of asphalt mixture and high temperature performance, applied in the direction of material inspection products, etc., can solve the problems of changing the performance of asphalt mixture, affecting the performance and use quality of asphalt mixture, etc.

Active 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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  • Method for testing high-temperature performance difference of asphalt mixtures after crushing of coarse aggregates
  • Method for testing high-temperature performance difference of asphalt mixtures after crushing of coarse aggregates
  • Method for testing high-temperature performance difference of asphalt mixtures after crushing of 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 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;

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

Embodiment 2

[0047] Example 2, High temperature deformation resistance test of asphalt mixture after coarse aggregate crushing

[0048] 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;

[0049] 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

[0052] Example 3, Water Stability Test of Asphalt Mixture after Coarse Aggregate Crushing

[0053] 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;

[0054] 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;

[0055]3. According to the test m...

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Abstract

The invention discloses a method for testing high-temperature performance differences of asphalt mixtures after crushing of coarse aggregates, and aims to evaluate the performance differences of the asphalt mixtures before and after crushing of the coarse aggregates. The method includes extracting four to six paved and ground cylindrical core samples from a construction field of an asphalt road surface; measuring bulk relative density and Marshall stability of each core sample; extracting asphalt mixtures from a mixing plant to form four to six test pieces; taking cores of the test pieces and cutting the cores into cylindrical indoor test pieces in the sizes the same with those of the core samples from the field; testing Marshall stability of each cylindrical indoor test piece; and computing to obtain a ratio of the Marshall stability of the cylindrical test samples from the field to the Marshall stability of the cylindrical indoor test piece. The batches and the types of the asphalt mixtures extracted from the mixing plant are identical to those of the cylindrical core samples. Compared with the prior art, the method has the advantages that the differences of gradation and high-temperature deformation resistance, water stability and low-temperature crack resistance of the asphalt mixtures before and after the coarse aggregates in the mixtures are crushed in a construction process are tested, and the performance differences of the asphalt mixtures before and after the aggregates are crushed are evaluated.

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 performance of road construction materials in highway engineering, in particular to a method for testing the difference in high-temperature performance 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 te...

Claims

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Application Information

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