Device for testing gas permeability of alkaline cured sample under influence of carbonization and operation method

Abstract

The invention discloses a device for testing the gas permeability of an alkaline cured sample under the influence of carbonization and an operation method. According to the invention, a confining pressure-gas permeation supply device, a carbonization-permeation device and a flow-temperature monitoring device are orderly combined. The device is specially provided with a steering ball valve and a data acquisition controller to realize the real-time or regular exchange of the infiltration gas and the opening and closing of carbon dioxide, and is specially provided with a barometer, a mass flow meter and a temperature probe to accurately monitor the gas pressure, flow and reaction temperature during gas input and discharge. The device is compact in structure and easy to operate. Cyclic implementation of carbonization maintenance and gas permeability test of the sample under different carbonization degrees is realized, elimination of influence of sample water soaking and unsaturated gas isfacilitated, the defect of large measurement error of the traditional water permeability coefficient is overcome, the test sample gas measurement permeability coefficient is more suitable for solvingthe background problem, the test sample gas measurement permeability coefficient is close to the real situation, and the result preparation degree is high. Excess carbon dioxide can be absorbed through the tail end alkali liquor bottle, and environmental pollution in the test process is avoided.

Description

Technical field[0001]The invention belongs to the category of civil engineering instruments and test methods, and specifically relates to a gas permeability test device and an operation method of an alkaline solidified sample under the influence of carbonization.Background technique[0002]With the development of my country’s economy and urbanization, infrastructure constructions such as urban construction, transportation and water conservancy often encounter weak 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. Poor characteristics have brought huge challenges to engineering construction. It is often necessary to improve the mechanical strength and stability of these soft soils or sands through artificial improvement treatments to meet the needs of engineering construction. Traditional soft soil or silt soil treatment methods are divided into physical treatment, chemic...

AI Technical Summary

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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