The gas breakthrough property of cement-based material is an important indicator with which to evaluate the sealing efficiency. Gas breakthrough experiments can be used to obtain the gas breakthrough pressure. However, different techniques for measuring the gas breakthrough pressure usually yield different results. In this paper, three commonly used experimental methods, including the step-by-step approach, the residual capillary pressure approach, and the mercury intrusion porosimetry (MIP) approach, are adopted to investigate the gas breakthrough pressure of mortar samples. The results of the three approaches are analyzed from the perspective of the definition of gas breakthrough, and it shows that the gas breakthrough pressures measured by the step-by-step approach are the most representative values. The MIP approach underestimates the breakthrough pressure due to the lack of confining pressure, and the residual capillary pressure approach represents the gas migration and water reimbibition process after the gas breakthrough. Theoretical analysis and fitting of experimental results show that the gas breakthrough pressure is linear with the permeability on a log-log coordinate.
Investigation of the Gas Breakthrough Pressure of Cement Mortar with Different Experimental Techniques
KSCE J Civ Eng
KSCE Journal of Civil Engineering ; 26 , 1 ; 325-335
2022-01-01
11 pages
Article (Journal)
Electronic Resource
English
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