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Method for evaluating damage self-healing capacity of asphalt mortar

An asphalt mortar, self-healing technology, applied in the direction of applying stable tension/pressure to test the strength of materials, can solve the problems of expensive test equipment, high operation requirements, and cumbersome evaluation process, and achieves a simple, feasible and easy-to-operate method. Effect

Active Publication Date: 2013-01-16
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can evaluate the self-healing performance of asphalt to a certain extent, the evaluation process is cumbersome, the operation requirements are high, and the test equipment is expensive, and the method is only applicable to a single asphalt material, and for asphalt The self-healing evaluation method combined with aggregates needs further research

Method used

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  • Method for evaluating damage self-healing capacity of asphalt mortar
  • Method for evaluating damage self-healing capacity of asphalt mortar
  • Method for evaluating damage self-healing capacity of asphalt mortar

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Taking a cylinder with a diameter of 30 mm and a height of 50 mm as the asphalt mortar to be tested as an example, the self-healing evaluation method includes the following steps:

[0030] (1) Preheat the test piece in a constant temperature box at 40°C for 5 hours; the test piece is an asphalt mortar cylinder with a diameter of 30mm and a height of 50mm, and its preparation method refers to the molding method according to JTJ052-2000 "Highway Engineering The preparation method of asphalt mixture specimens in T0704-1993 Asphalt Mixture Test Regulations is the static pressure method.

[0031] (2) Set the stretching temperature to 40°C, carry out bidirectional stretching with equal strain rate on the test piece, the stretching speed is 2mm / min, and collect the stress value σ at the initial moment 0 with strain value ε 0 , resulting in the initial tensile damage modulus E 0 , continue to stretch and collect the stress value σ acting on the test piece in real time t and ...

Embodiment 2

[0052] Taking a cylinder with a diameter of 30 mm and a height of 50 mm as the asphalt mortar to be tested as an example, the self-healing evaluation method includes the following steps:

[0053] (1) Preheat the test piece in an incubator at 35° C. for 6 hours; the test piece is the same as that in Example 1.

[0054] (2) Set the stretching temperature to 35°C, carry out bidirectional stretching with equal strain rate on the test piece, the stretching speed is 2mm / min, and collect the stress value σ at the initial moment 0 with strain value ε 0 , resulting in the initial tensile damage modulus E 0 , continue to stretch and collect the stress value σ acting on the test piece in real time t and strain value ε t , until the tensile damage modulus E after t seconds t with E 0 ratio of n 0 When it reaches 0.3, stop stretching;

[0055] (3) Apply a constant pressure of 0.1MPa to both ends of the test piece stretched in step (2) at the same time, the test piece will self-heal,...

Embodiment 3

[0059] Taking a cylinder with a diameter of 30 mm and a height of 50 mm as the asphalt mortar to be tested as an example, the self-healing evaluation method includes the following steps:

[0060] (1) Preheat the test piece in an incubator at 50° C. for 3 hours; the test piece is the same as that in Example 1.

[0061] (2) Set the stretching temperature to 50°C, carry out bidirectional stretching with equal strain rate on the test piece, the stretching speed is 2 mm / min, and collect the stress value σ at the initial moment 0 with strain value ε 0 , resulting in the initial tensile damage modulus E 0 , continue to stretch and collect the stress value σ acting on the test piece in real time t and strain value ε t , until the tensile damage modulus E after t seconds t with E 0 ratio of n 0 When it reaches 0.6, stop stretching;

[0062] (3) Apply a constant pressure of 0.1MPa to both ends of the test piece stretched in step (2) at the same time, the test piece will self-heal...

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Abstract

The invention relates to a method for evaluating the damage self-healing capacity of asphalt mortar. The method includes stretching an asphalt mortar test piece in two directions at constant temperature under the condition that the strain rate is equal; monitoring stress and displacement data in a stretching and self-healing process in real time; and analyzing the data via a computer to obtain a self-healing coefficient of the asphalt mortar test piece. The method has the advantages that the self-healing capacity of the asphalt mortar can be quantitatively evaluated, influence of different factors such as self-healing time, self-healing temperature, self-healing pressure and asphalt damage degree before self-healing on self-healing effects of asphalt materials can also be tested, the method can be applied to asphalt mortar materials with different proportions, is simple and feasible, operation is easy, and a guiding foundation for optimally selecting and optimally designing materials of sustainable asphalt pavements is laid.

Description

technical field [0001] The invention belongs to the application technical field of evaluating the rheological properties of asphalt mortar, and in particular relates to a method for evaluating the damage self-healing ability of asphalt mortar. Background technique [0002] With the rapid development of my country's expressway construction, our demand for road construction materials continues to increase, and the requirements for material performance continue to increase. At the same time, the problem of damage to the asphalt pavement of my country's high-grade highways has become increasingly apparent. During the long-term use of the road, the asphalt concrete structure will inevitably produce micro-cracks and local damage under the influence of the surrounding complex environment. If it is light, the service life of the pavement structure will be reduced, and if it is heavy, the safety of the entire structure will be jeopardized. Therefore, the main concern of relevant wo...

Claims

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Application Information

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IPC IPC(8): G01N3/08
Inventor 裴建中赵晓康张久鹏李彦伟石鑫包得祥
Owner CHANGAN UNIV
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