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Rapid evaluation method for compaction uniformity of asphalt mixture

A technology of asphalt mixture and evaluation method, applied in the direction of material weighing, analyzing materials, weighing by removing certain components, etc., can solve the problem of high price, achieve the effect of rapid prediction and ensure uniformity

Active Publication Date: 2018-10-16
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the problems of the existing evaluation method that the equipment is expensive and requires relatively advanced image analysis means, and provides a rapid evaluation method for the compaction uniformity of asphalt mixture

Method used

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  • Rapid evaluation method for compaction uniformity of asphalt mixture
  • Rapid evaluation method for compaction uniformity of asphalt mixture
  • Rapid evaluation method for compaction uniformity of asphalt mixture

Examples

Experimental program
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specific Embodiment approach 1

[0014] Specific embodiment one: In this embodiment, a rapid evaluation method for the compaction uniformity of asphalt mixture is carried out according to the following steps:

[0015] 1. According to the construction needs, select asphalt and aggregate to mix according to the design of the mix ratio, and then compact the mixture to obtain the asphalt mixture test piece;

[0016] 2. Immerse the asphalt mixture test piece in water, wrap the asphalt mixture with a film after it reaches the saturated state, take it out, and then transfer it to a low temperature environment for freezing to obtain the frozen asphalt mixture;

[0017] 3. Cut the frozen asphalt mixture into N small pieces to obtain N pieces of asphalt mixture. Weigh the mass of each single piece of asphalt mixture, then put it into the oven to a constant weight state, and record the constant weight. The quality of each individual asphalt mixture in the heavy state; calculate the water content coefficient of each indi...

specific Embodiment approach 2

[0020] Embodiment 2: This embodiment differs from Embodiment 1 in that the compaction described in Step 1 is the method of Marshall compaction, rotary compaction or shear compaction. Others are the same as the first embodiment.

specific Embodiment approach 3

[0021] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: the low temperature environment described in Step 2 is -10°C. Others are the same as those in Embodiment 1 or 2.

[0022] In the freezing process of the asphalt mixture in this embodiment, damage phenomena such as low-temperature cracking of the mixture cannot occur.

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Abstract

The invention provides a rapid evaluation method for the compaction uniformity of an asphalt mixture. The invention belongs to the field of quality detection and evaluation of the asphalt mixtures andin particular relates to the rapid evaluation method for the compaction uniformity of the asphalt mixture, aiming at solving the problems of an existing evaluation method that equipment is expensivein price and a relatively advanced image analysis means is needed. The method comprises the following steps: molding an asphalt mixture test piece through compaction equipment; immersing the molded test piece into water to enable the test piece to be at a sufficient water saturation state; the test piece is covered with a thin film so that the migration and loss of the water are prevented; the water saturation test piece covered with the thin film is put into a low-temperature place and freezing; then taking out the test piece; cutting the asphalt mixture by equal part; weighing each mixture test sample; then putting each mixture test sample into a drying oven and drying until the weight of the test sample is constant; then weighing the constant weight mass of each mixture test sample again, and calculating the moisture content coefficient of each test sample; evaluating the compaction uniformity of the asphalt mixture through calculating the discreteness of the N moisture content coefficients.

Description

technical field [0001] The invention belongs to the field of asphalt mixture quality detection and evaluation, and in particular relates to a rapid evaluation method for compaction uniformity of asphalt mixture. Background technique [0002] Asphalt mixture is a very complex heterogeneous composite material. The degree of compaction of asphalt mixture is an important part of engineering quality control during road construction. In fact, existing studies have shown that the compaction uniformity of asphalt also has an important impact on the life of asphalt pavement. It is of great significance to establish a reasonable and rapid evaluation method for the degree of compaction and uniformity of asphalt mixture for pavement quality control. [0003] At present, the uniformity evaluation method of asphalt mixture usually uses CT image processing method to identify the porosity distribution in the image to evaluate the uniformity of asphalt mixture. However, the evaluation meth...

Claims

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Application Information

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IPC IPC(8): G01N5/04
CPCG01N5/045
Inventor 王大为刘泉王宠惠屈鑫
Owner HARBIN INST OF TECH
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