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Testing device and method for shear modulus of geotextile interlayer of asphalt concrete structure

A technology for asphalt concrete and geotextiles, which is applied to measuring devices, using repetitive force/pulse force to test the strength of materials, instruments, etc., to achieve the effect of improving test accuracy and compact test device

Pending Publication Date: 2020-01-21
NANJING FORESTRY UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, so far, there are no corresponding devices and methods at home and abroad that can measure the shear modulus of geotextile interlayers in asphalt concrete structures under different temperatures, lateral pressures, and loading frequencies.

Method used

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  • Testing device and method for shear modulus of geotextile interlayer of asphalt concrete structure
  • Testing device and method for shear modulus of geotextile interlayer of asphalt concrete structure
  • Testing device and method for shear modulus of geotextile interlayer of asphalt concrete structure

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Embodiment

[0043] Such as figure 1 , figure 2 As shown, a kind of testing device of the shear modulus of the asphalt concrete structure geotextile interlayer that the present invention proposes, implements shear modulus measurement and comprises following concrete steps:

[0044] 1. Measure the area of ​​the geotextile interlayer in the test piece (0.0202m 2 ) and thickness (1.89mm).

[0045] 2. Bond the asphalt concrete 4 on both sides of the prepared asphalt concrete structure specimen with epoxy resin to the middle position where the groove is provided on the left splint 2 and the right splint 3; bonding and epoxy resin hardening During the process, it is necessary to pay attention to the alignment of the left splint 2 and the right splint 3; a support should be placed under the test piece to prevent the test piece from sliding down due to its own gravity when the epoxy resin is not fully hardened. ; In order to ensure the tight fit of the test piece and the left side splint 2 and...

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Abstract

The invention discloses a testing device and method for the shear modulus of a geotextile interlayer of an asphalt concrete structure. When the shear modulus is tested, a test piece of asphalt concrete structure to be tested is located between two side clamp plates, a loading spring fixed to the two side clamp plates applies required lateral pressure to the test piece to be tested. A cyclic shearload is applied by a loading plate, and relative displacement caused by cyclic shear force is monitored by four displacement sensors. The whole testing device is connected with a base through two fixing beams and fixing bolts. According to the size of the test piece, the applied load and the relative displacement recorded by the displacement sensors, the shear modulus of the geotextile interlayerunder specific testing temperature, loading frequency and lateral pressure conditions can be calculated. The testing device is simple in structure and low in cost, and the testing method is easy to master. The problems of testing the shear modulus of the geotextile interlayer in the asphalt concrete structure under different temperature, lateral pressure and loading frequency conditions are solved.

Description

technical field [0001] The invention relates to the technical field of performance testing of geotextiles, in particular to a testing device and a testing method for shear modulus of geotextile interlayers in asphalt concrete structures. Background technique [0002] Asphalt is a widely used cementing material for pavement structure surface, and its mechanical properties are closely related to temperature. In cold regions, after the construction of the asphalt pavement structure is completed, the asphalt material will gradually age with the increase of time and load times, and the aging will cause the asphalt material to gradually lose its ductility. In winter, due to the low temperature and lack of ductility, regularly distributed transverse shrinkage cracks will appear on the asphalt pavement. The appearance of transverse cracks not only affects the driving comfort, but also introduces surface water into the road structure, and further damages different structural layers. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/32G01N3/02G01N3/06
CPCG01N3/02G01N3/06G01N3/32G01N2203/0005G01N2203/0025G01N2203/0222
Inventor 李林
Owner NANJING FORESTRY UNIV
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