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Title |
Environmental Impact Assessment of Lightweight Aggregate Concrete According to Replacement Ratio of Artificial Lightweight Fine Aggregates
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Authors |
최병석(Byeong-Seok Choi) ; 윤현섭(Hyun-Sub Yoon) ; 문호권(Ho-Kwon Moon) ; 양근혁(Keun-Hyeok Yang) |
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DOI |
https://doi.org/10.4334/JKCI.2018.30.3.297 |
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Keywords |
경량콘크리트 ; CO2 ; 환경영향평가 ; 압축강도 ; 단위용적질량 lightweight concrete ; CO2 ; environmental impact assessment ; compressive strength ; unit weight |
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Abstract |
This study evaluated the environmental impact of concrete and concrete structures using artificial lightweight aggregates by comparing the impact with that of normal-weight concrete and concrete structures at the same compressive strength (fck). The assessment of each environmental impact could be simply formulated as a function of compressive strength and unit weight of concrete. Sand-lightweight concrete and all-lightweight concrete exhibited 43 % and 66 % higher total environmental impact, respectively, for fck of 24 MPa, and 38 % and 56 %, respectively, for fck of 40 MPa, when compared with that of normal-weight concrete. The increasing rates relative to the total environmental impact index determined in normal-weight concrete columns, beams, and walls were 6 %, 17 %, and 7 %, respectively, for the use of sand-lightweight concrete, and 23 %, 35 %, and 8 %, respectively, for the use of all-lightweight concrete. The environmental impact of lightweight concrete structures was more significantly affected by high environmental loads of artificial lightweight aggregates than by the section size reduction of structural elements.
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