Test piece preparation mould special for shearing test and preparation method thereof

Abstract

The invention discloses a test piece preparation mould special for a shearing test and a preparation method thereof, and relates to the technical field of road inter-layer binding performance tests. The invention solves the problems that no special forming mould for preparing a test piece is available and in the conventional method, the uniformity of the structures at the middle base and the surface layer is poor, the strength of the cut base layer of the test piece is reduced and the accuracy of the test result is affected. Two parallel side plates in the mould are connected with the two ends of a supporting bottom plate; two pairs of slots are oppositely formed in the inner walls of the two side plates; split bearing baffles are symmetrically inserted between two bearing baffles through the slots; the method comprises the following steps of: 1, uniformly stirring broken stones, water and cement and pouring the mixture into a mould provided with a second split bearing baffle; 2, controlling the speed of a pressure head so that the distance between the pressure head and the upper end of the second split bearing baffle is 40 mm; 3, coating priming oil on the test piece and then standing for 24 hours; 4, after the priming oil penetrates, arranging a first split bearing baffle, sealing with the broken stone and placing the sealed first split bearing baffle on the test piece for 4 hours; 5, pressing and forming; and 6, demoulding and preserving. The test piece preparation mould is used for a shearing test for measuring the road interlayer binding performance.

Description

Technical field [0001] The invention relates to the technical field of road interlayer bonding performance testing, in particular to a test piece preparation mold specially used for shear test and a preparation method thereof. Background technique [0002] The problem of interlayer adhesion between asphalt pavement surface and base is a hot spot in the road industry in recent years. In the construction of asphalt pavement, structural measures such as permeable layer and lower sealing layer are adopted to enhance the adhesion between base and surface. ability. Studies have shown that good interlayer adhesion can effectively avoid road diseases such as interlayer slippage and prolong the service life of roads. Shear test is the most intuitive and effective method to determine and evaluate the bonding ability between layers. It provides a basis for the comparison and selection of road layer bonding ability for different road layer treatment measures, but it is not currently used fo...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that there is no mold specially used for forming the base layer and the surface layer in the shear test; in the forming method of the traditional rutting specimen forming mold, the limitation of the height of the test piece leads to the formation of the base layer and the surface layer structure. The uniformity is poor, and the size of the specimen formed by the rutting mold is large. After the specimen is cut, the grains of the base layer are loose and fall off seriously, resulting in a significant decrease in the strength of the base layer and the change of the shear failure form, which affects the accuracy of the test results. problem, and then provide a special specimen preparation mold for shear test and its preparation method

Images