Site testing device and method for pavement interlayer bonding intensity

Abstract

The invention discloses a site testing device for pavement interlayer bonding intensity. The site testing device comprises a substrate, a fixing device and a rotation device, wherein the fixing devicecomprises a first fixing device and a second fixing device which are fixedly arranged on the substrate; the first fixing device and the second fixing device can clamp or release a structure layer tobe detected; the rotation device is fixedly arranged on the substrate through a bracket; the rotation device and the second fixing device are connected for driving the second fixing device to rotate.According to the site testing method for pavement interlayer bonding intensity, binding intensity among different structure layers of the pavement structure can be tested in site, the problem of bigger experiment error due to unreasonable loading ways can be easily solved, the damage area of an original pavement is relatively small, and an experiment method is simple.

Description

technical field [0001] The invention relates to the technical field of highway engineering detection, in particular to an on-site testing device and testing method for bonding strength between pavement layers. Background technique [0002] Asphalt pavement is commonly used in highway construction in our country. In order to make the multi-layer combination system of expressway asphalt pavement have good integrity, ensure the coordination of stress and strain changes when the pavement is subjected to vehicle loads, prevent rainwater from penetrating into the pavement structure, and improve the ability to resist water damage, the interlayer adhesion of asphalt pavement More and more knots have attracted the attention of project builders. Multi-layer pavement is generally paved in layers, and the bonding material is spread between layers to improve the bonding performance between layers. Often due to construction pollution, material property differences, etc., the inter-layer ...

AI Technical Summary

Problems solved by technology

During the test, it was found that the shear force of this type of instrument used for indoor and outdoor testing of interlayer bonding materials has obvious shortcomings: (1) The loading method of direct shear instruments produces a large bending moment at the bonding layer, resulting in vertical Due to the tensile stress at the interlayer interface, the interlayer failure is not all caused by shear force, but also partly caused by tensile stress tearing, which brings large errors to the test results; (2) Direct shear instruments are in the field During the test, in order to apply shear stress on the side of the specimen, the road surface must be damaged to a large extent so that there is enough visibility to put down the shearing equipment, so the test process will cause greater damage to the road surface; (3) Fixture rotation When testing such instruments, specific glue is needed to bond the fixture and the road surface. The bonding strength takes a long time to form, usually 3~4 hours, and it is easy to be damaged between the fixture and the road surface, resulting in test failure; ( 4) When the two types of instruments are tested on site, the attached figure 1 And attached figure 2 It can be seen that the direct shear instrument can only measure the bonding strength of the lowest layer of the structural layer. When the bonding strength between different layers needs to be tested on site, the original pavement will be greatly damaged; The difference, the test failure of the fixture rotation type instrument will only appear in the layer with the worst interlayer bond, that is, only the minimum value of the interlayer bond can be measured, and the bond strength between different layers cannot be measured. That is, the interlayer bond strength of the desired layer cannot be measured

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