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Title |
Quantification of Carbonation and Gas Permeability Characteristics in Cement Mortar with Different Mix Properties
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Authors |
박우현(Woo-Hyun Park) ; 최지완(Ji-Woan Choi) ; 유성(Seong Yu) ; 권성준(Seung-Jun Kwon) |
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DOI |
https://doi.org/10.11112/jksmi.2025.29.4.18 |
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Keywords |
탄산화; 투기 특성; 공극 구조; 내구성능; 정규화 Carbonation; Gas permeability; Pore structure; Durability performance; Normalization |
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Abstract |
Cement-based construction materials essentially contain pores generated during hydration reactions, and pore characteristics (porosity, pore structure, and pore connectivity) are closely related to durability performance since they govern mass and moisture transport. In this study, carbonation behavior, gas permeability, and pore structure characteristics in cement mortar with changing w/c (water to cement ratio) were quantitatively evaluated and the relationships between them were analyzed. For the work, several tests like accelerated carbonation, permeability, porosity evaluation, and mechanical property evaluation were carried out on the test mortar with three w/c ratios (0.4, 0.5, and 0.6) with normalization. Through the test results, when w/c increased to 0.6, the porosity increased from 17.17% to 22.69%. Increasing ratio of 5.3 times and 1.77 times were evaluated for gas permeability and carbonation rate coefficient, respectively. In particular, gas permeability significantly and non-linearly increased in the 0.6 w/c case due to the poor pore structure the induced gas pressure. The normalized durability performance test results can provide basic engineering information as a durability index.
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