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Title |
Properties of Concrete Using Lightweight Aggregate as Reuse of Coal Ash
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Authors |
박조범(Cho-Bum Park) ; 조현태(Hyun-Tae Jo) ; 김용혁(Yong-Hyok Kim) ; 류득현(Deug-Hyun Ryu) |
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DOI |
https://doi.org/10.4334/JKCI.2019.31.2.173 |
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Keywords |
석탄재 ; 경량 골재 ; 경량 골재 콘크리트 ; 유동성 ; 열 전도율 coal ash ; lightweight aggregate ; lightweight aggregate concrete ; fluidity ; thermal conductivity |
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Abstract |
As the usage of coal ash generated from the thermal power plant is very limited, so a large amount of coal ash is discarded. In case of coal ash is molded and firing together with clay, it is possible to produce lightweight aggregate suitable for Korean Standards. The result of concrete experiment which is lightweight aggregate was mixed with natural fine aggregate, as the lightweight aggregate replacement ratio increased, since the adsorbed amount of water was smaller, the fluidity of fresh concrete was secured. The compressive strength of lightweight concrete decreased as w/b and lightweight aggregate usage increased, but compressive strength of lightweight aggregate 45 % series decreased as aggregate separation occurred. So it is considered important to secure the fluidity of fresh concrete. The elastic modulus was measured at the same tendency to compressive strength, and its range was narrower than compressive strength. And thermal conductivity was lower as increase of lightweight aggregate, but it increased according to age. Especially, the unit weight of lightweight concrete in experiment is measured higher than mix design value, so a solution to this problem of unit weight is required.
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