Sample preparation method of scanning electron microscope of basalt fiber and asphalt mixed material fracture

Abstract

The invention relates to a sample preparation method of a scanning electron microscope of a basalt fiber and asphalt mixed material fracture, which relates to the technical field of sample preparation of a material for testing of a scanning electron microscope. The method comprises the steps of first preparing an asphalt mixed material Marshall cylindrical test piece doped with basalt fibers by a Marshall standard compaction method, then cutting the cylindrical test piece to obtain bar-shaped test pieces, and cutting each of two opposite edges of each bar-shaped test piece of the mixed material along the height direction to form a small incision; performing water bath on the test pieces to achieve heat balance; and clamping two sides of the incisions of each test piece, fracturing the bar-shaped test piece of the mixed material and air-drying the fractured test piece. The obtained test piece fracture is relatively smooth, thus being favorable for the micro-observation on basalt fibers of the scanning electron microscope, so that the bonding situation between the basalt fibers and the asphalt mixed material and the reinforcement effect of the fibers during fracturing of the asphalt mixed material can be accurately mastered.

Description

technical field [0001] The invention relates to a sample preparation technology for materials used in scanning electron microscope tests, in particular to a sample preparation method for scanning electron microscope tests on fractures of basalt fiber asphalt mixtures. Background technique [0002] Basalt fiber is made of natural basalt formed by volcanic eruption as raw material, which is crushed and put into the melting furnace. After melting at 1450℃~1500℃, it is a continuous fiber formed by rapid drawing through a platinum-rhodium alloy wire drawing bushing. During the whole production process, there is no industrial waste water, waste gas and other industrial waste, and it is known as "the new material of the 21st century". Basalt fiber was developed by the Moscow Institute of Glass and Plastics in 1954, and industrialized production was realized in Ukraine in 1985. In 2002, basalt fiber technology was included in my country's 863 high-tech projects. In asphalt mixture,...

AI Technical Summary

Problems solved by technology

The samples selected by this method are not representative, and cannot fully reflect the microstructure characteristics of the entire fracture surface and the distribution of basalt fibers on the failure surface. At the same time, due to the randomness of sample selection, the size and shape of the sample Different, not conducive to the observation and comparative analysis of SEM

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