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Title |
Durabilities of Lightweight Aggregate Concrete and Natural Aggregate Concrete
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Authors |
박조범(Cho-Bum Park) ; 김용혁(Yong-Hyok Kim) ; 전유빈(Yu-Bin Jun) ; 김재홍(Jae Hong Kim) ; 류득현(Deug-Hyun Ryu) |
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DOI |
https://doi.org/10.4334/JKCI.2021.33.3.227 |
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Keywords |
경량골재 콘크리트; 함수상태; 기건 경량골재; 내구성 lightweight aggregate concrete; water content condition; air-dried lightweight aggregate; durability |
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Abstract |
Lightweight aggregate concrete has the advantage of weight reduction in concrete structures. However, it exhibits different properties compared with ordinary concrete because of its high absorption rate. Generally, compressive strength is the most important factor in concrete quality, but a durability evaluation should be considered to verify the medium- and long-term stability of a concrete structure. In this study, durability evaluation for concrete was progressed by hydrous conditions of lightweight aggregate compared with natural aggregate. The results showed that internal moisture in lightweight aggregate greatly reduced the relative dynamic elastic modulus in accordance with the freeze-thaw cycle, and this requires countermeasures. In carbonation tests, resistance to carbonation was better than that of natural aggregate due to the W/B reduction effect, as the lightweight aggregate absorbed the concrete mixing water. In chloride solution tests, results were similar to the carbonation tests. Concrete using oven-dried lightweight aggregate yielded the best results, but air-dried lightweight aggregate did not differ from natural aggregate. For the above-mentioned reasons there is no problem with durability of concrete using none pre-wetting lightweight aggregate, meaning the usability of lightweight aggregate can be extended, and this will increase its demand.
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