Interlayer shear strength detecting instrument for asphalt pavement

Abstract

The invention discloses an instrument for detecting the shearing strength of the interlayer of an asphalt pavement. The instrument comprises a base, a driving motor, a pushing piece which ensures that the driving motor drives a shearing piece to shear a sample through a transmission piece, and a force gauge for real-time detection of shearing force; the transmission piece is mounted on the base; a data acquisition and control system which analyzes and processes signal detected by the force gauge and accordingly controls the driving motor according to the processing results, and a host computer connected with the data acquisition and control system are further included; the driving motor is a stepping motor; and the data acquisition and control system adopts an MSP430 singlechip, and is engaged in two way communication with the host computer through a USB interface. The invention has the advantages of reasonable mechanical structure, small size, light weight, high degree of automation and convenient use and operation, and can effectively monitor and control the shearing piece to be tested in a real-time manner and greatly improve the measuring accuracy.

Description

technical field [0001] The invention relates to an instrument for testing shear strength, in particular to an instrument for detecting shear strength between layers of asphalt pavement. Background technique [0002] According to the construction characteristics of the asphalt pavement, the crushed stone layer is firstly constructed, and then the asphalt base is spread on the formed crushed stone layer, and then the emulsified asphalt is spread on the laid asphalt base, and the asphalt surface layer is laid. Therefore, in A traveling bond is formed between the gravel layer and the asphalt base, and a surface bond is formed between the asphalt base and the asphalt surface. According to statistical analysis of data, the above two bonding layers have a great influence on the performance of the pavement. Therefore, it is of great significance to control the construction quality of the bonding layer during the construction process. In practice, most of the indicators for evaluat...

AI Technical Summary

Problems solved by technology

[0003] The electric shearing instrument for detecting the shear strength between layers of asphalt pavement is mainly composed of a mechanical mechanism and a data acquisition and analysis system used in conjunction with the mechanical structure, but the mechanical structure of the existing electric shearing instrument is more or less There are defects such as heavy weight and inconvenient use, and the two functions of indoor and outdoor testing cannot be realized, and its data acquisition and analysis system also has shortcomings such as low test accuracy and low degree of automation to varying degrees.

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