High-frequency fatigue test method for asphalt mixture slices in double-cantilever mode
A technology of asphalt mixture and double cantilever, which is applied in the direction of analyzing materials, using repeated force/pulsation force to test the strength of materials, measuring devices, etc., can solve the problems that the long-term fatigue performance of asphalt mixture cannot be inspected, so as to facilitate popularization and improve The effect of loading efficiency and simple operation
Inactive Publication Date: 2018-02-27
RES INST OF HIGHWAY MINIST OF TRANSPORT
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[0005] The purpose of the present invention is to provide a new method for the fatigue performance test of asphalt mixture, which overcomes the limitation that the prior art method cannot investigate the long-term fatigue performance of asphalt mixture within a short test time
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[0030] In order to better understand the present invention, the content of the present invention will be further elaborated below in conjunction with examples and accompanying drawings, but the content of the present invention is not limited to the following cases.
[0031] The invention provides a method for testing the high-frequency fatigue performance of asphalt mixture, comprising the following steps:
[0032] Step 1: Use a gyratory compactor to form a rotary compaction specimen; then use a high-precision cutting machine to cut the specimen into fixed-sized asphalt mixture slices, see figure 1 , figure 2 ;
[0033] Step 2: Adjust the fixing screw 5 on the fixing fixture 5 of the dynamic mechanical analysis instrument (DMA equipment), insert the asphalt mixture slice 4 under the movable jaw 3, pass through the clamping center screw 1 of the support rod 2, and insert the slice 4 Fix it on the double cantilever fixture of the dynamic mechanical analysis instrument (see ...
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The invention discloses a high-frequency fatigue test method for asphalt mixture slices in a double-cantilever mode. The method comprises the following steps of: fixing an asphalt mixture slice on a double-cantilever clamp of a dynamic mechanical analysis instrument; applying a high-frequency dynamic sinusoidal load to the middle part of a test piece by a DMA movable shaft driven by a motor; collecting corresponding stress strain in a test process; and calculating a complex modulus, an energy storage modulus, a loss modulus and a phase outer angle of the asphalt mixture. According to the method provided by the invention, the asphalt mixture slice test piece is used, and a high-frequency load is applied to the middle part of the test piece, so that the test piece is subjected to a fatigue test in a bending and tensile stress mode. The test method can effectively improve the loading efficiency and investigate the fatigue performance of the asphalt mixture in a longer service period. Thetest principle is simple, the test operation is simple, and popularization is facilitated.
Description
technical field [0001] The invention relates to the field of road engineering asphalt pavement, and relates to a new method for performing fatigue test on asphalt mixture. Background technique [0002] Asphalt concrete is subjected to repeated traffic loads and temperatures during its service period, and the strength of the pavement gradually decreases. When the load exceeds a certain number of times, the structural strength of the pavement after the decline is not enough to resist the stress generated inside the pavement, resulting in cracks on the pavement, which eventually leads to fatigue of the pavement destroy. Fatigue failure is one of the main forms of asphalt concrete pavement failure. Therefore, the fatigue performance of asphalt and asphalt mixture has been the research focus of pavement engineering for many years. [0003] At present, the fatigue tests in various countries in the world are divided into two categories: one is to test the characteristics of the a...
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CPCG01N3/38G01N2203/0005G01N2203/005G01N2203/0073
Inventor 牛岩王旭东张蕾张晨晨单伶燕王会
Owner RES INST OF HIGHWAY MINIST OF TRANSPORT