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Interlaminar shear device of cylindrical test piece of bituminous paving and shearing method thereof

A technology of interlayer shearing and asphalt pavement, which is applied to measuring devices, using stable shearing force to test the strength of materials, instruments, etc., can solve the problems of easily damaged instruments, and cannot apply compressive stress on shearing surfaces, so as to avoid damage effect

Inactive Publication Date: 2014-06-11
广东大象交通科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The problems of this test device and test method are: (1) when the shear test is performed on the cylindrical specimen, the eccentric loading of the loading device will generate a counter moment to the instrument, which is easy to damage the instrument; (2) the actual pavement structure layer The shear plane is subjected to compressive stress and shear stress at the same time, but the shear test method in Dr. Liu Li's thesis cannot apply compressive stress on the shear plane

Method used

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  • Interlaminar shear device of cylindrical test piece of bituminous paving and shearing method thereof
  • Interlaminar shear device of cylindrical test piece of bituminous paving and shearing method thereof
  • Interlaminar shear device of cylindrical test piece of bituminous paving and shearing method thereof

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Embodiment 1

[0033] In this embodiment, the cylindrical specimen is manufactured layer by layer using the indoor rotary compaction method.

[0034] According to "T0736-2011 Asphalt Mixture Rotary Compaction Cylinder Test Specimen Manufacturing Method (SGC Method)" in "Highway Engineering Asphalt and Asphalt Mixture Test Regulations" (JTG E20-2011), the cylinder required by the present invention is produced in layers body test piece. Select a test mold with an inner diameter of 10cm and a length of 30cm; at the bottom of the test mold, make a first structural layer 51 with a thickness of 10cm by rotating and compacting the AC-25C type asphalt mixture; when the temperature of the first structural layer 51 drops to room temperature , modify the emulsified asphalt on the surface of the first structural layer 51, and apply a thickness of 0.3mm. After the emulsified asphalt breaks, the first adhesive layer 54 is formed; then, continue to fill the first adhesive layer 54 with AC-20C type For asp...

Embodiment 2

[0047] The present embodiment is all identical with embodiment 1 except subordinate feature:

[0048] In this embodiment, pavement core samples taken on-site are used.

[0049] The upper layer of the asphalt pavement of an expressway is SMA-13 ​​asphalt mixture with a thickness of 4cm; the middle surface layer is AC-20C asphalt mixture with a thickness of 6cm; the lower layer is AC-25C asphalt mixture with a thickness of 8cm; The bonding layer between the upper and middle surface layers is 0.4mm thick modified emulsified asphalt; the bonding layer between the middle and lower layers is 0.5mm thick modified emulsified asphalt.

[0050] After 3 days of pavement construction, use a coring machine to drill continuous and complete core samples of the asphalt pavement upper layer, bonding layer, middle surface layer, bonding layer, and lower layer with a diameter of 10 cm for the shear test of the present invention. Wherein, the lower layer is the first structural layer of the pres...

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Abstract

The invention discloses an interlaminar shear device of a cylindrical test piece of a bituminous paving and a shearing method thereof. The device comprises shearing assembly, a press machine and a cylindrical test piece, and further comprises a pre-compressed member for locking the cylindrical test piece. The shearing assembly comprises a shearing pressure head and a shearing pedestal, wherein the shearing pedestal is mounted on a loading pedestal and provided with an empty groove in the center thereof, the empty groove is symmetrically provided with contact parts at two sides thereof, and the contact parts are respectively contacted with a first structural layer and a third structural layer. The shearing method provided by the invention can symmetrically apply shear stress, eliminate countertorque to instruments caused by eccentric loading, and therefore prevent damage to loading devices of the instruments.

Description

technical field [0001] The invention relates to the technical field of highway engineering asphalt pavement material and structure research, in particular to an asphalt pavement cylindrical specimen interlayer shearing device and a shearing method thereof. Background technique [0002] The thin layer of asphalt material sprinkled to strengthen the bonding between the various structural layers of the asphalt pavement is called the bonding layer. The bonding layer makes the various structural layers of the pavement a whole and bears the traffic load together. The performance of the bonding layer has a significant impact on the performance of the pavement structure. The bond between pavement structural layers is not strong, and under the action of driving load, the pavement is prone to various diseases such as shifting, wrapping and cracking. In general, the performance of bondlines can be evaluated by indoor shear tests. In 2008, Liu Li of Chang'an University proposed an in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/24G01N3/02
Inventor 葛折圣张肖宁胡晓倩黄明波
Owner 广东大象交通科技有限公司
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