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Title |
Fluidity and Compressive Strength Properties of Foamed Concrete Mixed with Fly Ash and Ground Granulated Blast Furnace Slag
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Authors |
이재욱(Jae-Uk Lee) ; 양근혁(Keun-Hyeok Yang) ; 문주현(Ju-Hyun Mun) |
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DOI |
https://doi.org/10.4334/JKCI.2020.32.2.137 |
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Keywords |
플라이 애시; 기포 콘크리트; 겉보기 밀도; 압축강도 발현 fly ash; foamed concrete; apparent density; compressive strength gain |
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Abstract |
The present study examined the fluidity and compressive strength development of foamed concrete with partial replacement of fly ash (FA) and ground granulated blast furnace slag (GGBS). The FA contents varied from 0 to 40 % with regard to the unit binder content by weight at the fixed contents (0 or 40 %) of GGBS. Test results showed that the defoamed depth of foamed concrete tended to increase as the FA content increased from 0 to 20 %, beyond which it decreased. Thus, all specimens, except for the mixtures with FA content of 20 %, achieved the limitation for defoamed depth for 0.6 grade quality of KS F 4039. With the increase in FA contents, the flow of foamed concrete slightly increased whereas the compressive strength decreased. As FA contents increased from 0 to 40 %, 28-day compressive strength decreased as much as 48 %. Thus, foamed concrete mixtures with FA exhibited approximately 36 % lower 28-day compressive strength than ordinary portland cement-based mixtures at the same apparent density. ACI 209R equations were modified to reliably assess the compressive strength gain of foamed concrete with FA at different ages.
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