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Asphalt concrete shearing performance test method

A technology of asphalt concrete and testing method, which is applied in the direction of using stable shear force to test the strength of materials, material inspection products, etc. Simple equipment, low requirements, the effect of eliminating the dilation effect

Inactive Publication Date: 2008-09-10
NANTONG ZHONGRUN CONCRETE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the specimen used in the test is thin, and the size effect is not considered, and increasing the thickness of the specimen will lead to uneven distribution of shear stress
In addition, the experimental equipment of this experiment is quite complicated, and it is only suitable for use in research work at present.

Method used

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Embodiment Construction

[0024] The design idea of ​​the asphalt concrete shear performance test method provided by the present invention is to adopt a hollow cylinder test piece, and the size of the test piece is designed to meet the requirement of eliminating the size effect; The load shaft is placed, and the load shaft is bonded to the inner wall of the specimen cylinder, and a uniform shear stress is generated on the inner wall of the specimen by applying torque to the load shaft. The test temperature and load form can be determined according to the research purpose of the user. Mechanical parameters (such as shear modulus) can be obtained by measuring the torsional angular displacement of the load axis and using simple mechanical formulas to obtain it. Through this experimental design, the following two objectives can be achieved:

[0025] ① By applying a uniform shear load to the inner surface of the hollow cylinder, a uniform shear stress can be generated inside the specimen, so the stress-str...

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Abstract

The invention relates to a testing method for the shear property of asphalt concrete, comprising the following steps: step 1: a hollow cylindrical asphalt concrete specimen (2) with prescribed size is molded; step 2: the asphalt concrete specimen (2) is preserved in a thermostatic air bath for heat preservation until the temperature in the the specimen is up to the temperature required in the test; step 3: the asphalt concrete specimen (2) is put in the middle of a symmetrical cylinder clamp (1), and at the same time a load transmitting shaft (3) is turned to be inserted into the center of the asphalt concrete specimen (2); epoxy adhesive is used for sticking the asphalt concrete specimen (2) with the symmetrical cylinder clamp (1) and the load transmitting shaft (3); step 4: a dynamic device (5) is used for exerting a torsion load on the load transmitting shaft (3), leading the inner wall of the asphalt concrete specimen (2) to produce even shear load; and a data collecting system (6) is used for recording the related data on torsion angle displacement and experiment time of the specimen; the experiment environmental temperature is kept at the required temperature during the testing. The testing method and testing indicators provided by the invention can effectively and accurately describe the shear deformation characteristics of the asphalt concrete material.

Description

technical field [0001] The invention relates to the technical field of asphalt concrete shear performance testing. Background technique [0002] At present, with the rapid growth of the national economy, the mileage of high-grade highways in my country is also increasing day by day, of which more than 90% of the road surface is made of asphalt concrete; All kinds of destruction mainly caused great losses to the country and society. A large number of studies have shown that the shear failure of asphalt concrete is one of the main reasons for the rutting and cracking of asphalt pavement, and the shear flow deformation accounts for more than 80% of the total rutting deformation. Therefore, it is very necessary to consider the shear performance of asphalt concrete . However, there are various problems in the existing test methods for evaluating and analyzing the shear performance of asphalt concrete, which are summarized here. [0003] (1) Triaxial shear test. Test the cylind...

Claims

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Application Information

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IPC IPC(8): G01N3/24G01N33/42
Inventor 黄晓明张裕卿赵永利
Owner NANTONG ZHONGRUN CONCRETE
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