Asphalt mixture penetrating type water steam diffusion coefficient detection method

Abstract

The invention discloses an asphalt mixture penetrating type water steam diffusion coefficient detection method. The method comprises the following steps: preparing a moulded cylindrical asphalt mixture sheet sample, injecting a solution for adjusting relative humidity into a container with a uniform size, covering the opening of the container by the bottom of the sample, sealing the contact parts between the sample and the containing opening, then placing the container and the sample into an environment box with controllable constant temperature and humidity; through the environment box, controlling the overall temperature and relative humidity out of the container, through the solution in the container, controlling the relative humidity in the container to obtain humidity difference in and out of the container; and through a formula, calculating the water steam diffusion coefficients under different relative humidity differences at different test temperatures. The provided method can measure asphalt mixture penetrating type water steam diffusion coefficients under different relative humidity differences at different temperatures, the reasonability of test scheme and operation convenience are both prominently improved, and at the same time, the test precision is guaranteed.

Description

technical field [0001] The invention belongs to the field of road engineering, and relates to a detection method for penetrating water vapor diffusion coefficient in road asphalt mixture. Background technique [0002] Early water damage of expressway asphalt pavement has become one of the most important diseases of expressway asphalt pavement in our country. It is generally believed that the cause of water damage is that liquid water seeps into the interior of the asphalt mixture from cracks and voids in the pavement, and gradually enters the asphalt and aggregate surface under the action of pore water pressure generated by freeze-thaw, vehicle dynamic load or vacuum negative pressure adsorption force. , causing the mixture to lose its cohesive force, resulting in cracking, loosening, potholes and other damage. [0003] At present, the traditional understanding and research on water damage at home and abroad mainly focus on the damage of water to asphalt mixture in liquid f...

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Problems solved by technology

However, the diffusion coefficients measured in existing studies are all carried out under a single humidity gradient, which cannot simulate the actual service environment in which water vapor penetrates through the asphalt surface and diffuses to the outside under the action of various relative humidity gradients, let alone explain the difference in relative humidity gradients. The effect on the water vapor diffusion coefficient

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