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Method for testing shape memory property of asphalt mortar

An asphalt glue and memory technology, which is applied in the direction of applying repeated force/pulsation force to test the strength of materials, material inspection products, etc., can solve the problems of inability to measure asphalt glue and difficult to evaluate the shape memory performance of asphalt glue

Inactive Publication Date: 2018-01-12
NANJING FORESTRY UNIV
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Problems solved by technology

[0009] The purpose of the present invention is to provide a method for testing the shape memory performance of asphalt mortar, which solves the problem that the current shape memory performance evaluation method cannot measure the shape fixation rate and recovery rate index of asphalt mortar, and it is difficult to evaluate the shape memory performance of asphalt mortar.
[0011] In order to solve the problem that the current shape memory performance evaluation method cannot measure the shape fixation rate and recovery rate index of asphalt mortar, and it is difficult to evaluate the shape memory performance of asphalt mortar

Method used

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Embodiment Construction

[0014] The invention provides a method for testing the shape memory performance of asphalt mortar, and the specific implementation steps are as follows:

[0015] (1) The shape memory short fiber whose phase transition temperature matches the highest temperature field of the asphalt pavement is selected as the reinforcement material, and the shape memory function is given to the fiber through three stages of pre-deformation: high temperature loading and stretching, keeping the load constant and cooling, and room temperature unloading ;

[0016] (2) According to the amount of 0.1%, 0.2%, 0.3%, 0.4% and 0.5% of the amount of asphalt, a certain amount of fiber and mineral powder are stirred evenly, and then the base asphalt heated to 160 ° C is added and stirred for 3 minutes to prepare a product containing Asphalt mortar with short shape memory fibers;

[0017] (3) Inject the asphalt mortar with different content of short shape memory fibers into the test mold with a diameter of...

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Abstract

The invention relates to a method for testing the shape memory property of asphalt mortar and belongs to the technical field of asphalt pavement material testing. The problems that in the existing shape memory property evaluation method, the shape fixed rate and the reversion rate index of the asphalt mortar cannot be measured and the shape memory property of the asphalt mortar is difficult to evaluate are solved. The method comprises the following steps: preferably selecting shape memory short fiber with phase inversion temperature matched with a road surface highest temperature field and giving a shape memory function to the fiber; and stirring a certain amount of fiber, mineral powder and asphalt uniformly to prepare an asphalt mortar cylindrical test piece, repeatedly applying constantload by a three-axis test instrument and unloading, putting into a drying box to perform maintenance, completely resetting the pre-deformed shape memory short fiber, continuously repeating the aboveloading and unloading test, calculating the shape memory index and evaluating the shape memory property of the asphalt mortar, comparing the influence on the shape memory property of the asphalt mortar by fiber admixture amount, determining the optimal admixture amount of the fiber, expanding the method for testing the shape memory property of the asphalt mortar, and improving the durability of the asphalt pavement.

Description

technical field [0001] The invention relates to a method for testing the shape memory performance of asphalt mortar, which belongs to the technical field of asphalt pavement material testing. Background technique [0002] In recent years, China has developed rapidly. With the rapid increase in the number of vehicles, especially the increase in overloaded vehicles, the traffic volume and axle load on the asphalt pavement far exceed the design range, and the original design service level is difficult to meet. At present, asphalt pavement is the main pavement type of road pavement in my country. Due to design, construction, traffic and other factors, the asphalt pavement has cracking, rutting, loose and other damage types. Among them, cracking is one of the main hazards. As the asphalt pavement is a multiphase discontinuous medium material, under the influence of temperature, traffic load, etc., the asphalt pavement has produced micro-cracks. However, due to the limited detec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/42G01N3/32
Inventor 许涛王沫胡智慧盛晓慧
Owner NANJING FORESTRY UNIV