Method for testing air permeability of surfactant for aerated concrete building blocks

Abstract

The invention relates to a method for testing air permeability of a surfactant for aerated concrete building blocks, which comprises the following steps: placing an aerated concrete sample block into water for absorbing water till the sample block is saturate; wiping the water on the surface of the sample block and standing the sample block for 2-5 hours for drying the surface of the sample block; coating the surfactant on the whole surface of the sample block, wherein no water leaves on the surface of the sample block after the sample block is statically placed and the thickness of the surfactant is 0.5-2mm; placing the sample block coated with the surfactant on a piece of slick paper and maintaining the sample block for 24-48 hours under a standard condition (temperature being 20 plus / minus 3 DEG C and humidity being above 90%); weighting and recording the mass of the sample block; placing the sample block into a constant temperature and humidity maintaining box; measuring and recording the mass of the sample block at specific intervals; and stopping testing after a change value of the mass of the sample block is stable, and calculating a vapor wet-stream density.

Description

technical field [0001] The invention belongs to the technical field of building materials, and more specifically relates to a method for testing air permeability of an interface agent of an aerated concrete block. Background technique [0002] The permeability of gas to materials is one of the important items for testing the physical properties of materials. The gas permeability test is often referred to as the test of the gas permeability of materials with a certain barrier property to gas. The air permeability of the air-entrained concrete block interface agent can make the moisture in the aerated concrete block continuously emit in the form of water vapor, so as to ensure that the plastering mortar of the aerated concrete block wall will not appear hollow under the sun exposure cracking phenomenon. Therefore, it is very important to accurately and effectively test the permeability of air-entrained concrete block interface agent to water vapor. [0003] For the test meth...

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Problems solved by technology

For example, the national standard GB / T17146-1997 "Test Method for Water Vapor Permeability of Building Materials" promulgated by my country in 1997 stipulates the test method for wet current density of building materials, but in the actual test operation process, it is difficult to form the test piece

At home and abroad, the research on air permeability mainly focuses on other industries other than building materials. There are few studies on the water vapor transmission performance of building materials (such as polymer mortar), and there is still no reasonable and effective testing method.

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