Asphalt rotation shear stress relaxation test apparatus

A rotary shearing and stress relaxation technology, which is applied in the direction of testing the strength of materials by applying a stable shear force, can solve the problems of large starting torque, application limitations, and shortening the initial loading time

Inactive Publication Date: 2013-07-24
DALIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The asphalt material relaxation test requires the initial loading time to be shortened as much as possible, and the starting torque is required to be as large as possible. However, the torque range of DSR is generally small (no more than 150N mm), and its application is greatly restricted.

Method used

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  • Asphalt rotation shear stress relaxation test apparatus
  • Asphalt rotation shear stress relaxation test apparatus

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Embodiment Construction

[0019] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0020] The asphalt rotary shear stress relaxation test device is composed of a test specimen, a test platform (8), a loading system, a temperature control system and a computer control system (1).

[0021] The test specimen consists of a fixture (17), a test mold (19) and an asphalt specimen (6). Two cylindrical steel test molds (19) are used to bond the asphalt specimen (6) in the middle, and then two A clamp (17) clamps the test mold (19) of the bonded asphalt specimen (6) in the middle; the interconnected clamps (17), test mold (19) and asphalt specimen (6) together constitute the test specimen; The clamp (17) adopts common fasteners on the market;

[0022] The test platform (8) consists of a base steel plate, a bearing housing (16), a fixed shaft (3), a rotating shaft (11), a torque sensor and an encoder (2), a pull-wire displacement sensor and an encode...

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Abstract

The invention discloses an asphalt rotation shear stress relaxation test apparatus, which belongs to the field of asphalt mechanical property test, and the apparatus is composed of a test platform, a loading system, a temperature control system and a computer control system. The computer control system controls the loading system for rotating and loading an asphalt test piece on the test platform and holding stress and automatically unloading under the constant shearing strain state, and controls the temperature control system for temperature control of the test process. The invention is suitable for determining relaxation performance of common asphalt, SBS modified asphalt, rubber asphalt and other polymer modified asphalts and asphalt cementation materials under the rotation shearing effect; When the repeating frequency is set to multitime, and loading, stress holding, unloading and stay time and rest test parameters are set, the repeat stress relaxation test can be completed.

Description

technical field [0001] The invention belongs to the field of asphalt mechanical performance testing, in particular to the testing of asphalt stress relaxation performance. Background technique [0002] The stress relaxation of asphalt materials refers to the phenomenon that the stress gradually decreases with time under the condition of constant temperature and constant strain. The evaluation index can use stress relaxation modulus and stress relaxation time, which respectively reflect the stress relaxation ability and stress relaxation rate of asphalt materials. . The stress relaxation performance of asphalt materials can be used to evaluate the low-temperature cracking resistance of asphalt and asphalt concrete pavements. The smaller the stress relaxation modulus or the shorter the stress relaxation time, the better the relaxation performance of asphalt materials, and the stronger the low-temperature cracking resistance. Stress relaxation test is also one of the basic tes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/24
Inventor 李玉华周长红李陆平杨文哲陈静云赵勇
Owner DALIAN UNIV OF TECH
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