Device and method for simultaneously testing the eight-way seepage coefficient of asphalt mixture with large voids
A technology of asphalt mixture and water permeability coefficient, which is applied in the directions of measuring devices, analysis materials, permeability/surface area analysis, etc., can solve the problems that multi-directional water seepage coefficient depends on numerical simulation and cannot be tested at the same time, and achieves simple structure and convenient operation of the device Effect
Active Publication Date: 2019-07-30
HOHAI UNIV
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Problems solved by technology
[0006] In order to solve the above existing problems, the present invention discloses a device and method for simultaneously testing the water seepage coefficient of large-void asphalt mixture in eight directions. For problems that cannot be tested at the same time, the specific technical solutions are as follows:
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[0048] The following examples describe in detail the device and method for simultaneously testing the water seepage coefficient of large-void asphalt mixture in 8 directions.
[0049] According to the mineral material gradation listed in Table 1, using 4.7% asphalt content, 4 large-void asphalt mixture OGFC-13 specimens with a porosity of 19% were formed by rotary compaction. 150mm.
[0050] Table 1 Mineral Material Grading
[0051] Mesh size(mm) 16 13.2 9.5 4.75 2.36 1.18 0.6 0.3 0.15 0.075 Passing rate(%) 100 91.0 62.5 25.5 16.4 12.9 10.2 7.3 6.2 4.9
[0052] For two of the test pieces, use a drilling machine to drill a cylindrical core sample along the radial direction of the test piece. The diameter of the core sample is 100mm, and the two ends of the core sample are cut flat to obtain a small cylinder with a height of 100mm. sample. For the other two core samples were drilled vertically, and cut flat to obtain another group of sma...
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Abstract
The invention discloses a device and method for simultaneously testing eight-direction water permeability coefficients of a large-gap asphalt mixture. The device comprises a water tank, a three-stage bracket system, a water seepage system and a drainage collection system, wherein a water outlet hole is formed in the bottom of the water tank; an overflow water pipe is arranged in the side wall of the water tank; the water seepage system comprises a head cover and a water seepage cylinder; and the drainage collection system is communicated with eight through holes of the water seepage cylinder through corresponding hoses. The method comprises the following steps of (1) preparing a vertical sample and a radial sample of the large-gap asphalt mixture; (2) selecting a water permeability coefficient test device; (3) testing eight-direction water permeability coefficients of the vertical sample of the mixture; and (4) testing eight-direction water permeability coefficients of the radial sample. The device is simple in structure and convenient and fast to operate, and the water permeability coefficients in eight directions in a horizontal plane and a vertical plane of the mixture can be tested, so that the directional difference of the water permeability can be analyzed from a three-dimensional space to comprehensively evaluate the water permeability of the large-gap mixture.
Description
technical field [0001] The invention relates to a device and a method for simultaneously testing the eight-way water seepage coefficient of a large-void asphalt mixture, and belongs to the technical field of testing and evaluating the permeability of asphalt mixture. Background technique [0002] Large-void asphalt mixture has been widely used in asphalt pavement because of its excellent anti-skid, noise reduction, drainage in rainy weather, anti-glare and other functions. The existence of these functions mainly depends on the abundant interconnected voids inside the large-void asphalt mixture. In the process of designing large-void asphalt mixtures, two methods are usually adopted to ensure abundant interconnected voids inside the mixture. The first method is to put forward requirements on the total void ratio or connected void ratio of asphalt mixture; the other method considers that the connected voids in large-void asphalt mixture are water seepage and drainage channels...
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IPC IPC(8): G01N15/08
CPCG01N15/08G01N15/0806
Inventor 陈俊李嘉浩孔燕殷小晶
Owner HOHAI UNIV