Gas permeability test device and operation method of alkaline solidified sample under the influence of carbonization

Abstract

The invention discloses a gas permeability test device and an operation method of an alkaline solidified sample under the influence of carbonization. The invention combines a confining pressure-gas permeation supply device, a carbonization-permeation device and a flow-temperature monitoring device in an orderly manner. The device is specially equipped with a steering ball valve and a data acquisition controller to realize real-time or timing exchange of infiltrated gas and opening and closing of carbon dioxide. Specially equipped with a barometer, mass flow meter and temperature probe, it can accurately monitor the air pressure, flow rate and temperature reflex. The device has compact structure and simple operation. Realize the cycle of carbonization maintenance and gas permeability test of samples under different carbonization degrees, which is beneficial to eliminate the influence of sample water immersion and unsaturated gas, overcome the defect of large error in traditional water permeability coefficient measurement, and test sample gas to measure permeability coefficient It is more suitable for solving background problems, close to the real situation, and the result is highly prepared. Excess carbon dioxide can be absorbed through the lye bottle at the end to avoid environmental pollution during the test.

Description

technical field [0001] The invention belongs to the category of civil engineering instruments and testing methods, and in particular relates to a gas permeability testing device and an operating method of an alkaline solidified sample under the influence of carbonization. Background technique [0002] With the development of my country's economy and urbanization, urban construction, transportation and water conservancy and other infrastructure often encounter soft soil layers or liquefied silt soil layers of different thicknesses, and these soils have low strength, high compressibility, large void ratio, and high water content. Unfavorable characteristics 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 s...

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Problems solved by technology

However, the existing gas permeability tester is difficult to combine with the soil carbonization device, and cannot switch back and forth between two different gases, carbonized gas and test gas, and it is difficult to meet the samples with changing permeability; the existing tester needs The calculation of gas permeability can only be carried out after a complete aeration operation, and the aeration process is relatively complicated, which cannot satisfy the test according to the degree of carbonization of the soil during the carbonization process.

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