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A Method for Obtaining Evaluation Index of Physical Hardening Performance of Asphalt Material

A technology of asphalt material and hardening performance, which is applied in the direction of testing the strength of the material by applying a stable bending force, and can solve the problems of being unable to objectively and accurately evaluate the physical hardening performance of asphalt materials

Active Publication Date: 2017-08-25
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 problem that the physical hardening performance of asphalt materials cannot be evaluated objectively and accurately in the current process of evaluating the physical hardening performance of asphalt materials

Method used

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  • A Method for Obtaining Evaluation Index of Physical Hardening Performance of Asphalt Material
  • A Method for Obtaining Evaluation Index of Physical Hardening Performance of Asphalt Material
  • A Method for Obtaining Evaluation Index of Physical Hardening Performance of Asphalt Material

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specific Embodiment approach 1

[0019] A method for obtaining an evaluation index of asphalt material physical hardening performance, comprising the following steps:

[0020] Step 1. Prepare the test piece: heat the asphalt to the state of glue and pour it into the specimen mold of the bending beam rheometer. The specimens are divided into two groups, and one group is denoted as specimen a 0 , and the other group is denoted as specimen b 0 ;

[0021] Step 2, the specimen a prepared in step 1 0 Put it into the bending beam rheometer and keep the constant temperature for 1 hour. The constant temperature is the temperature T℃ required by the product to be evaluated. After the constant temperature is completed, the test piece a 1 , for specimen a 1 Carry out the creep test to obtain the stiffness modulus curve A of the material as the asphalt material modulus curve under the reference condition; carry out at least two sets of parallel tests, and select the data with consistent results of the two sets of para...

specific Embodiment approach 2

[0029] The steps of drawing the time-shift factor relationship curve C of the asphalt material in step five of the present embodiment are as follows:

[0030] Record the shift factor and time corresponding to the stiffness modulus curve A, and record the corresponding point as α; the shift factor of the stiffness modulus curve A is 1, and the time is 1 hour, which is the coordinate of α (1,1);

[0031] Record the displacement factor and time corresponding to the stiffness modulus curve B, and record the corresponding point as β; the displacement factor of the stiffness modulus curve B is Δ t , the time is t 2 hours, that is, the coordinates of β (Δ t ,t 2 );

[0032] In the logarithmic coordinate system, with time as the abscissa and the displacement factor as the ordinate, mark points α and β, and connect the two points as the time-displacement factor relationship curve C.

[0033] Other steps and parameters are the same as those in the first embodiment.

specific Embodiment approach 3

[0035] In this embodiment, t 2 From 6 hours to 24 hours.

[0036] Other steps and parameters are the same as those in Embodiment 1 or 2.

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Abstract

The invention relates to a method for obtaining an evaluation index of the physical hardening performance of an asphalt material, relating to a method for obtaining an evaluation index of the asphalt material performance. The invention aims to solve the problem that the physical hardening performance of the asphalt material cannot be evaluated objectively and accurately in the current process of evaluating the physical hardening performance of the asphalt material. The present invention first determines the stiffness modulus curve of the asphalt material according to the rheological test of the bending beam, and based on the time-temperature equivalent principle of the viscoelastic material, translates the modulus curve of the asphalt material after physical aging to the modulus of the asphalt material under the reference condition curve, calculate the corresponding displacement factor, and then calculate the slope KZ of the time-displacement factor curve; it is used to evaluate the physical hardening performance of asphalt materials. The invention is applicable to the evaluation and selection of asphalt materials.

Description

technical field [0001] The invention relates to a method for obtaining performance evaluation indexes of asphalt materials. Background technique [0002] Low-temperature cracking of asphalt pavement is a common problem in cold regions and one of the main diseases of asphalt pavement. Existing studies have shown that the low-temperature performance of asphalt is one of the main factors affecting the low-temperature cracking resistance of pavement. Therefore, the mechanical behavior of asphalt materials under low-temperature conditions has attracted the attention and attention of researchers for many years. [0003] In order to accurately evaluate the low-temperature performance of asphalt materials, researchers have carried out a lot of research from the aspects of theoretical analysis, test methods and evaluation indicators. Although most studies have considered the influence of the strength characteristics, deformation capacity and modulus of materials on the low-temperatu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/20
Inventor 张磊谭忆秋邢超纪伦
Owner HARBIN INST OF TECH
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