Method and device for measuring maximum water discharge amount of porous pavement

Abstract

The invention discloses a method and a device for measuring the maximum water discharge amount of a porous pavement. The device comprises a water tank, a water pump, a water spraying head, a bracket and a clamp used for clamping a to-be-detected pavement sample, wherein the water pump is arranged in the water tank and connected with the water spraying head through a pipeline, and a valve and a flow meter are arranged on the pipeline between the water pump and the water spraying head; the clamp is arranged on the bracket and positioned below the water spraying head, and a water outlet cross section of the water spraying head is identically equal to a cross section of the to-be-detected pavement sample. The water permeability of the pavement can be detected through the method and the device; the method and the device can be used for making protective measures in advance in a weather from light rain to extraordinary rainstorm and even in an extreme weather with relatively high rainfall to reduce the loss of people's properties and lives and the like caused by rainfall.

Description

technical field [0001] The invention relates to a method and a device for measuring the seepage coefficient of a porous pavement. Background technique [0002] Porous asphalt pavement refers to the use of asphalt mixture with large porosity as the upper layer of the pavement structure (or the upper layer and the middle layer) as a drainage layer, and a densely graded impermeable layer is laid under the drainage layer. , and a waterproof bonding layer is set between the drainage layer and the impermeable layer, so that the rainwater can pass through the internal connected pores and then drained away through the comprehensive road drainage system. [0003] Porous asphalt mixture adopts open gradation design, and the porosity is relatively large (generally 18% to 25%). Rainwater can quickly infiltrate into the road surface, and then drained through the connected pores through the edges of both sides of the road, so that the road surface cannot form water. Membrane reduces driv...

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Problems solved by technology

[0011] The difference between this method and the actual rainfall: First, the water head is variable rather than constant. As time goes on, the water surface height continues to decrease, and the water pressure in the pipe decreases. The measured results cannot correspond to the actual situation well; Second, in this method, the height of the water column in the pipe remains the same, and the water volume is the same. In reality, due to the different rainfall, the instantaneous pressure of the raindrops on the road surface is also changing, which cannot simulate the situation of different actual rainfall. Third, the actual When the drainage performance of the road surface is poor, a water film will be formed on the road surface, and the water film is the key factor for the attenuation of road surface friction and the decline of road surface skid resistance

Based on the above reasons, it shows that this method cannot intuitively reflect the correlation between rainfall and water film

[0012] In addition, the acceptance index of water seepage coefficient given in the current code is mainly for densely graded asphalt concrete, and is rarely used for the actual detection of large-porosity concrete pavement such as drainage pavement, and no corresponding index requirements are put forward, which is not conducive to the development of drainage pavement. Quality Control

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