Asphalt mixture test fixture and using method thereof

Abstract

The invention relates to an asphalt mixture test fixture and a using method thereof, and belongs to the field of asphalt concrete tests. The asphalt mixture test fixture consists of a frame, a cushion block and a force applying airbag or a solid force-measuring device; and the assembled frame can support a testpiece during force application. The implementing key points of the fixture are that: the force applying airbag or the solid force-measuring device is used for measuring a force applying value, and pressure applied to the testpiece is kept stable through nuts on a pressing plate; and moreover, force can be intermittently applied to the testpiece through pressurization and decompression of the force applying airbag. The asphalt mixture test fixture can constantly or intermittently apply force to an asphalt mixture testpiece, so that the asphalt mixture testpiece accords with an actual state in the testing process; and the asphalt mixture test fixture is small in volume and convenient to use.

Description

technical field [0001] The invention relates to a test fixture and its use method, in particular to an asphalt mixture test fixture and its use method. Background technique [0002] In order to evaluate the water stability of asphalt mixture, it is necessary to conduct asphalt mixture freeze-thaw splitting test. The test is carried out according to the "Asphalt Mixture Freeze-Thaw Splitting Test" (T0729-2000) in the "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20-2011). The size of the test piece is: diameter 101.6mm±0.25mm, height 63.5mm±1.3mm. The test piece is vacuum saturated with water, then put into a plastic bag with 10ml of water, frozen, then put into a constant temperature water tank to dissolve, and finally recovered Normal temperature (25°C ± 0.5°C), and then proceed to the next splitting test. [0003] During the freezing and thawing process of asphalt mixture on the actual road surface, it will continue to be affected by th...

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Problems solved by technology

[0003] During the freezing and thawing process of asphalt mixture on the actual road surface, it will continue to be affected by the load of road vehicles, and it is carried out under the condition of continuous or intermittent force. In the aforementioned test procedures, the freezing and thawing process of the specimen is It can be seen that there is a large difference between the test state of the asphalt mixture and the actual state of the asphalt mixture, which will cause the difference between the test data and the actual state, and affect the water stability evaluation results of the asphalt mixture.

[0004] "Shear Strength Test of Asphalt Mixture (Triaxial Compression Method)" (T0729-2000) in "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20-2011) provides a method that can test the axial direction of the specimen. A device for loading and confining pressure, but the device is bulky and the specimen is wrapped, so it cannot be used for the freeze-thaw splitting test of the mixture

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