Abstract
Klinkenberg effect has a significant influence on the test results of gas permeability. To study the gas slippage effect of concrete and its microscopic mechanism, five kinds of concrete with different w/c ratios were designed, and the gas permeability coefficients were measured at seven additional gas pressures and five saturation degrees according to the Cembureau method, the effects of w/c ratio, saturation degree and additional gas pressure on slippage effect were investigated by the Grey Correlation Analysis (GCA) method. Meanwhile, based on the nuclear magnetic resonance (NMR) method, the influences of microstructure parameters on gas intrinsic permeability and slippage factor were studied. Results show that w/c ratio which reflects the microstructure characteristics of concrete, is the most important factor affecting the slippage effect. Moreover, a larger porosity indicates a more obvious slippage effect. The pores in concrete with size of 100–200 nm, have the greatest influence on the gas slippage effect.
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