Test piece position fixing device in asphalt mixture local three-axis creep test

Abstract

The invention relates to a fixing device for accurately fixing the position of a mixture test piece in an asphalt mixture local three-axis creep test. The device can be formed by assembling two identical semicircular basic parts, wherein the internal diameter of a round side wall of each semicircular basic part is the same as the diameter of the mixture test piece, so that the mixture test piece just can be put into the device; the diameter of a through hole of a base plate is the same as that of a loading base, so that the base just can pass through the through hole; and the asphalt mixture test piece is put into the device, the base enters the through hole of the fixing device and contacts the bottom of the test piece, the fixing device is moved downwards, and is disassembled into the two semicircular parts and moved away after the bottom of the test piece is separated from the fixing device, and a pressure head is moved downwards to contact the upper surface of the test piece, so that the pressure head can be accurately loaded to the center of the test piece, and the accuracy of a test result is prevented from being influenced by the eccentric compression of the test piece.

Description

technical field [0001] The invention relates to a position fixing device for a local triaxial creep test specimen of asphalt mixture. Background technique [0002] With the rapid development of the national economy, the mileage of high-grade highways in my country is also increasing day by day, among which asphalt pavement is widely used due to its advantages of comfort and noise reduction, and occupies a dominant position. However, with the increase of highway traffic and the increase of heavy-duty vehicles, rutting has become one of the main diseases of asphalt pavement, seriously affecting the safety and comfort of road driving, and rutting of highway asphalt pavement has become a common concern. Rutting is mainly caused by the compaction deformation and flow deformation of asphalt mixture under high temperature conditions. Therefore, the high temperature deformation performance of asphalt mixture has been paid close attention to by road workers at home and abroad. Many h...

AI Technical Summary

Problems solved by technology

If the loading position of the indenter is slightly shifted, it will cause eccentric compression of the specimen, which will seriously affect the accuracy of the test results

However, the test piece requires the tester to put it into the triaxial chamber and fix the position of the test piece to ensure that the indenter is accurately loaded to the center of the upper surface of the test piece. At present, this process is completely determined by the test operator subjectively.

Since the test personnel cannot look down vertically when the position of the specimen is fixed, and the angle of deviation from the vertical overlooking position is relatively large, it is likely that due to the error of the viewing angle, the eccentric compression of the specimen will affect the accuracy of the test results

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