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Indoor forming-based asphalt pavement structure interlayer interface nondestructive separation method

A technology of asphalt pavement and separation method, which is applied in the direction of analysis of materials, preparation and sampling of test samples, can solve the problems of difficulty in accurately defining the boundary between layers of asphalt pavement structure, expensive CT scanning equipment, and unfavorable technology promotion. The effect of complete interlayer interface between the upper and lower structures of the composite specimen, easy to popularize and use, and low economic cost

Active Publication Date: 2020-12-29
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the high cost of CT scanning equipment, high economic cost, complicated technical operation, and the difficulty of accurately defining the interface boundary between asphalt pavement structure layers, it is not conducive to the promotion of related technologies.

Method used

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  • Indoor forming-based asphalt pavement structure interlayer interface nondestructive separation method
  • Indoor forming-based asphalt pavement structure interlayer interface nondestructive separation method
  • Indoor forming-based asphalt pavement structure interlayer interface nondestructive separation method

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Effect test

Embodiment 1

[0045] Such as figure 1 As shown, the embodiment of the present invention provides a method for non-destructive separation of interlayer interfaces of asphalt pavement structures based on indoor forming, including the following steps S1 to S4:

[0046] S1. The lower structure of the asphalt pavement structure composite test piece is formed by indoor forming method;

[0047] In this example, if figure 2 For the structural layer shown in middle 5, the lower layer structure in the asphalt pavement structure composite specimen includes the middle surface layer structure in the upper-middle surface layer composite specimen, the lower layer structure in the middle-lower layer composite specimen, and the lower layer-base layer Base structure in composite specimens;

[0048] Wherein, the lower structure of the composite test piece is formed by a rotary compactor, a Marshall compactor, a static pressure forming machine or a wheel rolling forming machine.

[0049] Taking the forming m...

Embodiment 2

[0072] This embodiment is similar to Embodiment 1, except that a Marshall compaction instrument is selected when the composite test piece is formed.

[0073] During the molding process of the upper and lower structural layers of the composite test piece in this embodiment, according to the operation process of the Marshall compaction instrument, weigh the corresponding asphalt mixture with a mass of 1200g (standard Marshall test piece) or 4050g (large-scale Marshall test piece), and punch each side on both sides. 50 times (standard Marshall specimen) or 75 times (large Marshall specimen). The rest of the implementation process and operation steps are consistent with Embodiment 1.

Embodiment 3

[0075] This embodiment is similar to Embodiment 1, except that the static pressure method is used when the composite test piece is formed.

[0076] In the forming process of the upper and lower structural layers of the composite test piece in this embodiment, the test piece is a cylinder with a diameter of 100 mm, and the mass of the corresponding asphalt mixture is calculated according to formula 2 according to the operation flow of the static pressure method. After the asphalt mixture is filled into the test mold, start the static pressure equipment to gradually increase the pressure from 1MPa to 20-30MPa until the test piece reaches the predetermined height.

[0077] π×r 2 ×h×ρ=m (2)

[0078] In the formula, r is the radius of the specimen, 50mm; h is the set height of the specimen, mm; ρ is the Marshall standard compaction density, g / cm 3 ; m is the mass of asphalt mixture, g.

[0079] The rest of the implementation process and operation steps are the same as in Example...

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Abstract

The invention discloses an indoor forming-based asphalt pavement structure interlayer interface nondestructive separation method. The method comprises the following steps of: forming a lower structurein an asphalt pavement composite structure test piece, putting an ultrathin isolation film with two surfaces coated with an oil-water mixed solution above the lower structure, forming an upper structure in the asphalt pavement composite structure test piece, and separating the upper and lower structure layers of the composite test piece along the interlayer interface along the central axis direction of the composite test piece. The method realizes nondestructive separation of the indoor formed asphalt pavement structure interlayer interface, and has an obvious separation effect; and the separated composite test piece has the advantages of complete interlayer interface of the upper and lower structure layers, clear surface texture, obvious construction characteristics, protruding surface characteristics and abundant microscopic information, and realizes nondestructive separation of the indoor formed asphalt pavement structure interlayer interface. The method has the advantages of accurate definition of the asphalt pavement structure interlayer interface, low economic cost, simple and convenient operation, and easy popularization and use.

Description

technical field [0001] The invention relates to the technical field of asphalt pavement detection, in particular to a non-destructive separation method for interlayer interfaces of asphalt pavement structures based on indoor forming. Background technique [0002] Asphalt pavement is a multilayer layered system structure. Its structural composition often includes a surface layer, a base layer and a cushion layer. Each structural layer can be paved in two or three layers according to needs, and each structural layer is passed through the corresponding Adhesive material for sticking. However, under the joint action of vehicle load and external environment (such as temperature and humidity), the interlayer bonding material is prone to failure. In addition, the modulus and deformation coordination ability of each structural layer in the pavement structure are quite different, which often leads to the asphalt pavement failure. The layers of the structure fall off each other, whic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/42G01N19/04G01N1/28G01N1/36
CPCG01N1/286G01N1/36G01N19/04G01N33/42G01N2001/366
Inventor 宋珲黄恒伟黄杨权李林育任东亚杜健欢艾长发
Owner SOUTHWEST JIAOTONG UNIV
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