Equipment for measuring torsional shear resistance of pavement structure interlayer treatment measures

Abstract

The invention discloses a device for measuring the torsional shear performance of interlayer treatment measures of pavement structure, which comprises: a bracket, which is a rigid cubic frame; a casing, which is arranged on the outer periphery of the bracket; a drive shaft, which is The vertical direction extends through the upper part of the housing, and it is slidably connected in the vertical direction and rotatably connected with the support along the axis; the vertical load loading device is connected to the drive shaft The upper part is to apply the load in the vertical direction to the drive shaft, and the vertical load loading device also includes a vertical load sensor; a rotary drive device is connected to the drive shaft so that the drive shaft Rotating along its axis, the rotary drive device also includes a torque sensor; the connecting pressure head has a flat disc with a diameter of 150mm at its lower part, and a connecting rod is fixedly connected upwards in the center of the disc along the vertical direction. The connecting rod can be coaxially connected with the drive shaft; the fixing device is arranged at the bottom of the support.

Description

technical field [0001] The invention relates to a device for measuring the torsional shear performance of interlayer treatment measures of pavement structure, in particular to a device capable of measuring interlayer treatment measures between semi-rigid base and asphalt pavement, interlayer treatment measures of asphalt pavement, cement concrete panels The device with interlayer treatment measures the torsional shear performance of the asphalt pavement. Background technique [0002] Whether the asphalt interlayer treatment measures are effective is the key to ensure the overall service of the asphalt pavement structural layer. The bonding performance and interlayer slip resistance of the asphalt pavement structural layer interlayer treatment measures are important factors that affect the quality and service life of asphalt pavement. factor. [0003] At present, there are no unified standards and norms for material composition design and performance evaluation of pavement i...

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Problems solved by technology

[0005] At present, the on-site interlayer mechanical performance evaluation index mainly includes pullout strength, which is mainly used to evaluate the bonding performance of interlayer materials. This experimental method can be used for indoor tests and outdoor tests, but both have not yet been finalized. Area, loading rate and other influencing factors are relatively large, and data reproducibility and horizontal comparability are poor

The main problems of the domestic puller are manual loading, and the loading rate is uncontrollable; the shape of the puller is mostly rectangular, following the habit of the construction industry, which is not suitable for the actual situation that most of the asphalt pavement test pieces in the highway industry are circular; The area of ​​the puller is generally small, and the diameter is generally 10cm, while the maximum particle size of the semi-rigid base is generally 31.5mm. The pulling strength is greatly affected by the maximum particle size aggregate of the structural layer, and the pulling strength is small. The coefficient of variation is large, so it is not suitable for evaluating the bonding performance between semi-rigid base and asphalt surface

[0006] The test methods for evaluating the mechanical properties between layers include direct shear and oblique shear tests. These two types of tests cannot be directly used for on-site pavement testing. The pavement needs to be cored and cut and brought back to the room for testing; the shape of the test pieces is mostly rectangular. , does not match the circle commonly used in asphalt pavement testing; when the test piece is circular, its size is less than 10 cm in diameter, so it is not suitable for evaluating the interlayer measures of pavement structure with a maximum aggregate particle size greater than 31.5 mm Insufficient situation; there is also the inability to simulate the influence of different pavement structural layer thicknesses on the interlayer shear strength

[0007] In addition, Chang'an University has developed a set of torsional shear test equipment, which is mainly used for the performance evaluation of bridge deck pavement interlayers. The loading rate is manually controlled, and the size is 10 cm in diameter. The coefficient of variation is large during on-site testing; it cannot be used for indoor testing. Evaluate the effect of different structural thicknesses on the interstory torsional shear strength, and cannot simulate the effect of wheel loads on the interstory torsional shear strength

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