Journal
CEMENT & CONCRETE COMPOSITES
Volume 129, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.cemconcomp.2022.104491
Keywords
Gas permeability; Quasi-stationary flow method; Pore structure; Water saturation; Klinkenberg effect
Funding
- National Key Research and Development Program of China [2019YFC1904904]
- Natural Science Foundation of China [52078111, 51878153, 51808189]
- Post-graduate Research & Practice Innovation Program of Jiangsu Province [KYCX21_0150]
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Gas permeability is an important property associated with the durability of cement-based materials. This study evaluates the gas permeability of cement-based materials using a quasi-stationary flow experimental method. The results show that the intrinsic permeability of dried cement-based materials is affected by the addition of limestone powder, fly ash, and aggregate. The study also proposes a prediction model for the gas permeability of cement-based materials under arbitrary water saturation and pressure gradient.
Gas permeability is an important property associated with the durability of cement-based materials. In this study, an experimental method based on applying a quasi-stationary flow is adopted to evaluate the gas permeability of cement-based materials. The results indicate that the intrinsic permeability of dried cement-based materials is affected by the addition of limestone powder, fly ash, and aggregate. The Katz-Thompson equation could predict the intrinsic permeability by using the capillary porosity, average diameter, and pore tortuosity. The intrinsic permeability of partially saturated cement-based materials decreases when the water saturation increases. The Van Genuchten-Mualem model could describe the relative gas permeability of partially saturated cement-based materials, and the model parameters n value between 1 and 2 while m value ranging from 0.64 to 0.69 for cement and mortar. Moreover, the power function relationship between the intrinsic permeability and Klinkenberg constant of cement-based materials has also been corroborated. Finally, a prediction model of gas permeability of cement-based materials under arbitrary water saturation and pressure gradient is proposed.
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