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Testing method for interlaminar shearing stress state

A state test, test method technology, applied in the direction of testing the strength of materials by applying a stable shear force

Active Publication Date: 2013-04-03
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although it overcomes the above-mentioned defects of the direct shear tester, the shear strength obtained from this test is only the shear strength of the bond between materials under the condition of no friction between the layers, and under the actual road conditions, the vehicle has no friction with the road surface. The shearing process is often accompanied by interlayer friction

Method used

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Embodiment Construction

[0025] 1. Purpose and scope of application

[0026] This method is suitable for determining the shear strength between cement concrete materials and asphalt concrete materials. The test temperature and loading rate can be selected according to relevant regulations and needs. If there is no special regulation, the loading rate is 4mm / min~4.5mm / min.

[0027] This method is applicable to the test of shear strength between a cement concrete cylinder specimen with a diameter of 101.6mm±1mm and a height of 20mm±1mm and an asphalt concrete cylinder specimen with a diameter of 101.6mm±1mm and a height of 60mm±1mm.

[0028] 2. Apparatus and materials

[0029] (1) The shear tester consists of the following parts:

[0030] ① Transmission system, the load application speed controlled by the transmission system is 4mm / min~4.5mm / min;

[0031] ②Sensing system, including two load cells. The accuracy of the force sensor should be less than 0.1%;

[0032] ③ data acquisition system and di...

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Abstract

The invention relates to a testing method for the interlaminar shearing stress state, which is a method for evaluating the shearing strength between a cement concrete deck and an asphalt pavement layer. The method can simultaneously acquire the cohesive force C and the friction angle between interfaces by testing once, and is a reasonable testing method for the shearing strength between the cement concrete deck and the asphalt pavement layer. The testing method comprises the following steps: (a) an inclined plane with an inclined angle of 5 degrees-30 degrees, namely a rigid triangular block (8), is arranged in a direction vertical to load application (4); a horizontal force-measuring device (5) is positioned behind the rigid triangular block (8); a loading specimen (1) and a fixed specimen (3) are positioned in a clamp (10); the load vertically applied to the loading specimen (1) is converted into a horizontally applied force to realize application of positive pressure on a shearing interface (2); (b) bearing balls (9) are arranged on the inclined plane to eliminate the effect of the frictional force on the inclined plane to the test result; and (c) based on the testing method, the cohesive force and the friction angle between the interfaces are acquired by calculating with a calculation formula as shown in the specification.

Description

technical field [0001] The invention relates to a method for evaluating the shear strength between a cement concrete bridge deck and an asphalt pavement layer, and belongs to the technical field of highway pavement performance testing. Background technique [0002] In the process of bridge construction in our country, cement concrete bridges have been widely used. At present, asphalt concrete is widely used as the pavement material on cement concrete bridge decks, thus forming the asphalt concrete pavement layer of concrete bridges. In order to make the multi-layer system composed of cement concrete and asphalt concrete have good structural bearing capacity and durability, the treatment technology between bridge pavement layers and the detection technology of various indicators have attracted more and more attention. It is one of the problems that have been puzzling the bridge and road workers all the time to determine the appropriate test method for the shear strength betw...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/24
Inventor 赵永利侯中新
Owner SOUTHEAST UNIV
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