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Title |
Fundamental Performance Evaluation of Recycled Aggregate Concrete with Varying Amount of Fly Ash and Recycled Fine Aggregate
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Keywords |
순환골재 ; 순환골재 콘크리트 ; 압축강도 ; 염소이온 투과 저항성 ; 중성화 recycled aggregate ; recycled aggregate concrete ; compressive strength ; chloride ion penetrability ; carbonation |
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Abstract |
This study investigates fundamental properties of recycled aggregate concrete which incorporated 100% recycled coarse aggregate and various amount of recycled fine aggregate. In addition, for the purpose of the improvement of long term strength and durability, a part of cement was replaced with fly ash. Compressive strength and resistance to chloride ion penetration and carbonation were investigated. When the coarse aggregate was completely replaced with the recycled the replacement ratio of the fine aggregate with the recycled was recommended to be limited below 60% in the consideration of strength. The strength of the steam-cured specimen was very comparable to the wet-cured at 28 days. As fly ash content increased the resistance to chloride ion penetration was increased. The chloride ion penetrability based on the charge passed was found to be low at 21 days and very low at 56 days, respectively. Carbonation depth and carbonation velocity coefficient increased as the fly ash content increased and the relationship between the carbonation depth and recycled fine aggregate replacement ratio was not clear. Up to 28days, however, the measured carbonation depth was mostly less than 10mm which could be considered as low
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