Testing method for grading variability of bituminous mixture after crushing coarse aggregates

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

Active Publication Date: 2015-01-21
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 grading variability of bituminous mixture after crushing coarse aggregates
  • Testing method for grading variability of bituminous mixture after crushing coarse aggregates
  • Testing method for grading variability 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 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" (JTJ 052-2000) T0725-2000 test method, sieve the mixed mineral mater...

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 testing method for grading variability 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: randomly extracting the bituminous mixture from a spiral distributor of a paver, and obtaining a mixed mineral aggregate after bitumen is separated; measuring passing rates of sieve pores with nominal maximum particle sizes; in the same position, cutting and heating the paved and ground bituminous mixture in a microwave oven, extracting the mixture from a middle part, and obtaining the site mixed mineral aggregate; screening the site mixed mineral aggregate, and measuring the passing rates of the sieve pores with the nominal maximum particle sizes; and respectively calculating variation ratios of the passing rates of the key sieve pores with the nominal maximum particle sizes in the mineral aggregate of the mixture. Compared with the prior art, according to the testing method, the grading variability of the bituminous mixture before and after crushing the coarse aggregates in the mixture is tested in a construction process, and a problem of evaluating the differences of the performances 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 performance of road construction materials in highway engineering, in particular to a method for testing the gradation variability 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 specification...

Claims

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Application Information

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Patent Type & Authority Patents(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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