Pavement water penetration dynamic testing device and testing method

Abstract

The invention discloses a pavement water penetration dynamic testing device and testing method. The testing device comprises a vacuum pump, a vacuum pumping tube and a bearing container, an asphalt sample is placed in the bearing container, and a wheel rolling device and a sealing device are arranged on the upper portion of the asphalt sample. The vacuum pump is arranged in the testing device to simulate the pumping action of the bottom of the asphalt sample, the wheel rolling device is arranged on the upper portion of the asphalt sample to simulate actual force of a vehicle on the asphalt sample when the vehicle passes a pavement, and an electric heating element and a wedge-shaped component are arranged on the lower portion of the sealing device, a test area can be effectively sealed. Bythe aid of the means, water penetration conditions of the asphalt pavement can be really simulated when the vehicle runs the asphalt pavement, and realer test data can be acquired.

Description

technical field [0001] The invention relates to a water seepage test device for asphalt pavement, in particular to a dynamic test device for water seepage on the road surface and a test method thereof. Background technique [0002] The main cause of water damage to asphalt mixture pavement is that excessive water enters the interior of the pavement structure, so the accurate test of the water seepage coefficient of the pavement is of great significance to the quality of the pavement. [0003] The existing anti-seepage test of asphalt pavement adopts a standard water seepage meter test, through the sealing bottom ring, through a certain water pressure, with water as the medium, it is suitable for measuring the water permeability coefficient of asphalt mixture pavement and rolled asphalt mixture specimens. To test the water seepage performance of the pavement and the mix ratio design of the asphalt mixture. [0004] The current water seepage coefficient test has the following...

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Problems solved by technology

[0004] The current water seepage coefficient test has the following two problems: 1. The process of sealing the base takes a long time, and it is easy to dirty and pollute the road surface. It requires one person to seal, and one person to count and count. This not only wastes manpower, but also reduces efficiency; 2. It is difficult to find a sealing material that is fast, environmentally friendly, and has strong bonding ability. There are often many tests with poor sealing results, and the test results cannot reflect the real situation.

But the asphalt pavement has a lot of small gaps, this sealing method can not fully cope with the gap structure of the asphalt pavement, the result is that some water often seeps through the gap between the sealing ring and the asphalt pavement, resulting in inaccurate test results precise

[0006] At the same time, there is also the fact that the water permeability coefficient measured by conventional tests is lower than the actual water permeability coefficient of the road surface, and may be much lower. The reasons include: first, the tension of the water surface makes it difficult for it to enter the fine pores; secondly, Even if water enters, if the internal pore connectivity rate is not high, the gas in the pores cannot be excluded and compressed, and it is difficult for water to continue to enter; finally, and most importantly, without considering the actual force situation when the road surface is soaked in water, the existing ones are all The test is carried out under the condition of no external force, but when the road surface is soaked in water and a vehicle passes by, the vehicle has a downward force on the road surface and is accompanied by a horizontal shear force. These forces affect the pores inside the asphalt pavement. It has the effect of extrusion and relaxation, which can promote the absorption and infiltration of water on the asphalt pavement, so the existing test equipment cannot truly and accurately reflect the actual situation, and cannot obtain accurate test data

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