Clamp and method for testing pavement interlayer shear fatigue test piece

Abstract

The invention relates to a clamp and a method for testing a pavement interlayer shear fatigue test piece. At present, no one does research on interlayer shear fatigue of a pavement structure at home and abroad. The invention provides the clamp for testing the pavement interlayer shear fatigue test piece, which comprises an upper clamp component and a lower clamp component; the upper clamp component and the lower clamp component are abnormally-shaped blocks of which the longitudinal sections are L-shaped; each abnormally-shaped block is formed by splicing two same parts; the upper clamp component and the lower clamp component are buckled; and through slots are formed on the middle parts of transverse buckling parts. By using the structure, left and right ends of the test piece are fixed by the upper clamp and the lower clamp; a bonding layer in the middle of the test piece is positioned at the combined part of the through slots of the two clamps; and a vertical waveform load parallel to the bonding layer in the middle of the test piece is exerted to obtain a relation between a shear stress (strain) and an experimental loading frequency, so a fatigue shear characteristic parameter of the test piece can be obtained.

Description

technical field [0001] The invention belongs to the technical field of pavement engineering equipment, and relates to a shear fatigue test device for pavement structural layers under repeated loads, in particular to a fixture for testing pavement interlayer shear fatigue specimens and a testing method thereof. Background technique [0002] The pavement structure is a multi-layer composite system composed of different materials. Due to the difference in materials, the deformation between different structural layers cannot be consistent and coordinated. Therefore, it is generally required to spread sticky oil and permeable layers between the structural layers. It is hoped that the deformation coordination of different structural layers can be achieved through this interlayer bonding measure. Under the action of driving load, the interior of the pavement structure, especially the joint between layers, is prone to large shear stress and strain. Repeated shear stress and strain c...

AI Technical Summary

Problems solved by technology

Under the action of driving load, the interior of the pavement structure, especially the joint between layers, is prone to large shear stress and strain. Repeated shear stress and strain cause the interlayer bonding layer to break due to shear fatigue, and the pavement structure layer Delamination occurs, followed by cracks, pits, shifting and even damage to the base layer, which seriously affects the normal performance and service life of the pavement

[0003] At present, no one has studied the interlayer shear fatigue of pavement structures at home and abroad, and no one has been involved in the shear fatigue test between layers of structures. At present, the road structure design is seriously inconsistent with the actual use, that is, the pavement structure has not been in a completely continuous state during the actual use process, so how to effectively characterize the interlayer shear fatigue characteristics of the pavement structure is a problem that needs to be solved to ensure the normal use of the pavement

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