Determination of pore structure evolution of cement paste under early-age carbonation by N₂ isotherms
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2025-09-26
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Journal Article
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Abstract
Early-age carbonation is of great significance for regulating the pore structure of cement paste and improving the durability of materials, but the systematic evaluation of the effect of carbonation on the evolution of pore structure is incomplete. Based on the nitrogen (N₂) adsorption-desorption isotherms, the study calculated the pore structure parameters of cement paste, such as pore size distribution, cumulative pore volume and specific surface area. The study proposed the importance of pore types and volume correction factors in studying pore structure evolution caused by carbonation. The difference in pore type and volume correction factor are more obvious at a smaller radius. The evaluation of specific surface area and pore volume increment shows that calcium carbonate formed by carbonation can reduce the pore volume and form a slit-type pore network. The role of SCMs is shown to reduce the pore radius and effectively inhibit the coarsening trend of pore caused by carbonation.
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published
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493
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143226
Publisher
Elsevier
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Subject
Early-age carbonation, slit-type pore; Volume correction factor; Pore size distribution; Cumulative pore volume