Fracture sample preparation method based on crack resistance of basalt fiber and asphalt mixture

Abstract

The invention discloses a fracture sample preparation method based on the crack resistance of a basalt fiber and asphalt mixture. The fracture sample preparation method based on the crack resistance of the basalt fiber and asphalt mixture comprises the following steps: molding a basalt fiber and asphalt mixture test piece by adopting a Marshall standard compaction technology, performing asphalt mixture split test under different temperature conditions, selecting a Marshall test piece section and a typical small sample after the test is completed, and observing the indirect tensile section andthe microscopic morphology by a digital camera, a scanning electron microscope and other optical instruments in order to observe the fracture morphology characteristics of the basalt and asphalt mixture macroscopically and microscopically. A fracture obtained by the sample preparation method has various morphologies, is clean and pollution-free, and has no interference from external human factors,and the relationship between the crack resistance of the asphalt mixture and the morphology of the fracture can be analyzed in order to further analyze the improvement mechanism fo the crack resistance of the basalt fiber reinforced asphalt mixture.

Description

technical field [0001] The invention relates to the research field of highway building materials, in particular to a fracture sample preparation method based on the anti-crack performance of basalt fiber asphalt mixture. Background technique [0002] Fiber has been generally recognized by the engineering community in improving the road performance of asphalt mixture and improving the quality of asphalt pavement. However, due to its short research and application time, there are still the following problems: [0003] 1. As a new type of fiber product, basalt fiber is still in the development and verification stage in the field of road engineering in my country, and the technical standards for basalt fiber products for asphalt mixture are not yet mature. Therefore, it is necessary to continue to carry out a lot of research work on the application of basalt fiber asphalt mixture. [0004] 2. The mechanism analysis of basalt fiber improving asphalt mixture is not deep enough. ...

AI Technical Summary

Problems solved by technology

[0004] 2. The mechanism analysis of basalt fiber improving asphalt mixture is not deep enough

However, the current sample preparation methods for SEM observation are different and there is no uniform standard, but it is necessary to ensure that the surface of the sample is not contaminated. If there is contamination, it must be properly cleaned without damaging the surface texture of the sample, and then dried

The distribution of basalt fibers in the asphalt mixture has three-dimensional disorder and local agglomeration, and the specimens are prone to failure forms such as aggregate fracture, stone-asphalt interface degumming failure, asphalt mortar layer failure, and fiber pulling out under stress. The common cutting sample preparation method is easy to destroy the original morphology of the asphalt mixture fracture, and cannot comprehensively reflect the microstructure characteristics of the entire fracture surface and the distribution of basalt fibers on the failure surface

A lot of dust and sewage will be generated during cutting, which will adhere to the surface layer of the sample and be difficult to clean

When using scanning electron microscope samples for surface microscopic analysis, it will be found that a lot of dust is attached to the surface, which will affect the observation results

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