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Title |
Evaluation of Mechanical Properties of Lightweight Concrete Using Bottom Ash Aggregates and Foam
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Authors |
지구배(Gu-Bae Ji) ; 문주현(Ju-Hyun Mun) ; 양근혁(Keun-Hyeok Yang) |
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DOI |
https://doi.org/10.4334/JKCI.2019.31.4.375 |
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Keywords |
바텀애시; 기포; 경량 콘크리트; 단위 결합재양; 성숙도 bottom ash; foam; lightweight concrete; unit binder content; maturity |
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Abstract |
The objective of the present study is to examine the mechanical properties of precast lightweight concrete made using bottom ash aggregates and foam. Nine concrete mixes were prepared with different unit binder contents between 450 kg/m3 and 550 kg/m3 and foam volume fraction between 0 % and 25 %, and cured under different temperatures between 20 °C and 60 °C. The cementitious materials used in the mixes consisted of ordinary portland cement of 30 %, fly ash of 20 %, and ground granulated blast-furnace slag of 50 %. The compressive strength development of bottom ash aggregates and foam-based lightweight concrete (BF-LWC) was formulated on the basis of maturity function and non-linear regression analysis using test data. The splitting tensile strength and modulus of rupture of BF-LWC were empirically formulated as a function of compressive strength and foam volume fraction. To achieve the minimum requirements for the compressive and flexure strengths of lightweight concrete panels specified in KS F 4736 and consider the thermal resistance, the mixture conditions for BF-LWC need to include the unit binder contents of 550 kg/m3 and foam volume fraction of 10~25 %.
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