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Title |
Comparison of Water Absorption and Carbonation Rate in Concrete and Cement Mortar
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Authors |
김태준(Tae-Jun Kim) ; 홍서준(Seo-Jun Hong) ; 권성준(Seung-Jun Kwon) |
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DOI |
https://doi.org/10.11112/jksmi.2026.30.4.194 |
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Keywords |
압축강도; 내흡수성; 흡수율; 탄산화 속도계수; 굵은골재; 모르타르 Compressive strength; Sorptivity; Water absorption; Carbonation rate coefficient; Coarse aggregate; Mortar |
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Abstract |
This study compared and evaluated the durability performance of concrete and cement mortar with comparable water-to-cement (w/c) ratios. To this end, cement mortars with three different w/c ratios and concretes with three design compressive strength grades (24 MPa, 30 MPa, and 50 MPa) were prepared. Their mechanical properties, including compressive strength and elastic modulus, as well as durability related properties, including carbonation resistance, water absorption, and sorptivity, were systematically evaluated. The compressive strength of concrete was found to be approximately 1.3?1.5 times lower than that of the corresponding mortar, whereas its elastic modulus was approximately 1.1?1.3 times higher, due to the improved dimensional stability enhanced by coarse aggregates under compressive loading. As the air content and porosity increased, the water absorption and sorptivity in mortar were approximately 1.3?3.3 times greater than those of concrete, indicating more active moisture transport in the mortar matrix. In contrast, despite its higher porosity and greater water absorption capacity, mortar exhibited a lower carbonation rate than concrete. Although concrete had greater resistance to moisture transport and gaseous diffusion, the higher cement content of mortar provided the formation of a larger amount of hydration products, which enhanced its resistance to carbonation.
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