A carbonization test method with adjustable carbon dioxide concentration

Abstract

The invention discloses a carbonization test method with adjustable carbon dioxide concentration. The test method comprises the steps of installing a sample to be carbonized, adjusting the carbon dioxide concentration, applying sample confining pressure, applying air intake pressure, sample carbonization, tail gas treatment and the like. In this method, carbon dioxide and another non-reactive gas are successively introduced into the pressure tank, and the automatic adjustment of the carbon dioxide concentration is realized by adjusting the ratio of the inlet pressure of the two gases; the carbon dioxide gas is squeezed to the In the intake pipe, the problem that the traditional concrete carbonation box can only change the carbon dioxide concentration but not the pressure at the same time is solved; the confining pressure is applied by air pressure instead of water pressure, which avoids the influence of heat conduction and penetration of water on the carbonization of the sample. This test method is beneficial to solve the coupling effect of carbon dioxide concentration and ventilation pressure on the carbonation and solidification effect of soil, and is of great significance to promote the effective application of low-concentration carbon dioxide gas in magnesia solidification materials.

Description

technical field [0001] The invention belongs to the category of civil engineering instrument test methods, in particular to a carbonization test method with adjustable carbon dioxide concentration. Background technique [0002] With the development of economy and urbanization, urban construction, transportation and water conservancy and other basic constructions often encounter soft soil layers or liquefied silt soil layers of different thicknesses, and these soils have disadvantages such as low strength, high compressibility, large void ratio, and high water content. characteristics, which have brought great challenges to engineering construction. It is often necessary to artificially improve the mechanical strength and stability of these weak soils or sandy soils to meet the needs of engineering construction. Traditional soft soil or silt soil treatment methods are divided into physical treatment, chemical solidification treatment and microbial solidification treatment. ...

AI Technical Summary

Problems solved by technology

Although some concrete carbonation boxes can regulate the carbon dioxide concentration, the adjustment principle of the carbon dioxide concentration is: under the same air pressure, by setting the flow ratio of carbon dioxide and air, the carbon dioxide concentration adjustment in the sealed box is realized; and the gas pressure of the carbonation box is low , and the pressure cannot be adjusted, which greatly limits the research on the carbonization effect of carbon dioxide concentration, ventilation pressure and carbonization time at the same time

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