Test method for self-healing effect of sand mist sealant with shape memory properties

A self-healing, fog-sealing material technology, used in the preparation of test samples, the use of repetitive force/pulse force testing material strength, and measurement devices, etc. Sealing layer materials, complex methods and other problems, to achieve good economic benefits, save a lot of time and energy, save a lot of time

Inactive Publication Date: 2020-03-13
NANJING FORESTRY UNIV
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Problems solved by technology

[0006] The purpose of the present invention is to provide a test method for the self-healing effect of a sand-mist sealant with shape memory performance, thereby solving the lack of a self-healing effect test method for a sand-mist sealant material at present. Similar methods are more complicated, tedious to operate, and difficult to test Time-consuming, poor repeatability and reproducibility of test results

Method used

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Embodiment Construction

[0012] The invention provides a method for testing the self-healing effect of a sand-mist seal with shape memory performance, and the specific implementation steps are as follows:

[0013] (1) The shape memory short fibers and thermoplastic particles whose phase transition temperature matches the highest temperature field on the road surface are selected. The fibers are used as reinforcement materials, and are subjected to three-stage pre-deformation through high temperature loading and stretching, keeping the load constant and cooling, and unloading at room temperature , endow the fiber with shape memory function;

[0014] (2) Use modified emulsified asphalt, pre-deformed shape memory fiber, thermoplastic particles, basalt fine aggregate with a maximum particle size of 1.18 mm and water at room temperature to prepare a self-healing sand mist seal layer Material;

[0015] (3) Inject the sand mist sealant material into a dumbbell-shaped silicone rubber mold with a length of 10...

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Abstract

The invention provides a self-healing effect test method of a sand-mist seal layer with shape memory performance, which solves the problem of lack of a self-healing effect test method for a sand-mist seal layer material at present, and belongs to the technical field of asphalt pavement durability. The present invention firstly prepares the sand-mist sealing layer material with shape memory performance according to a certain formula, injects the sand-mist sealing layer material into a dumbbell-shaped silicone rubber mold, and demoulds after cooling to obtain a tensile test piece; Two seams are pre-cut on the side, and then the asphalt direct tensile tester is used to perform a tensile test on the specimen until cracks appear on the entire section; the specimen is heated for self-healing, and the self-healing of the crack is investigated by scanning electron microscope and energy spectrometer Finally, repeat the tensile test on the healed specimen, evaluate the self-healing effect of the sand mist sealant material by the ratio of the two breaking strengths, and determine the optimal dosage of shape memory fibers and thermoplastic particles, thus providing an intuitive and effective Method for evaluating the self-healing effect of sand-mist sealant materials.

Description

technical field [0001] The invention relates to a method for testing the self-healing effect of a sand mist seal layer with shape memory performance, and belongs to the technical field of asphalt pavement durability. Background technique [0002] As early as the 1860s, some scholars discovered that asphalt mixture has self-healing properties, and then the research on the self-healing properties of asphalt materials has attracted extensive attention from road workers, and the self-healing properties of asphalt materials have been increasingly Apply to pavement paving and preventive maintenance technology. Researchers hope that by understanding the formation mechanism and influencing factors of asphalt material self-healing, they can find suitable methods to improve the self-healing performance of asphalt materials, so as to resist fatigue cracking and prolong the service life of asphalt pavement. However, due to the asphalt material and its complex and variable physical and ...

Claims

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Application Information

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IPC IPC(8): G01N3/32G01N3/06G01N1/36G01N1/28
Inventor 许涛盛晓慧王沫胡智慧
Owner NANJING FORESTRY UNIV
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