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This study investigates engineering properties of concrete using recycled limestone, which is originally abandoned due to the lower degree of purity during a manufacturing process of cement. The limestone examined in this study, is tested to be used as fine aggregate which is one of the concrete components replacing natural fine aggregate (Ns) and environmental-friendly recycled materials. Twenty specimens are fabricated and compared with various parameters of water to binder (W/B) ratio and incorporating ratio of limestone-crushed-aggregate (Ls). For the fundamental properties of concrete, slump, slump flow, air contents and unit weight are tested. And compressive strength test is also performed until the age of 91 days. In addition, for the evaluation of concrete durability, an accelerated neutralization test and drying shrinkage length change test are carried out. Test results showed that increase of incorporating ratio of Ls inclined concrete fluidity and declined air content. compressive strength value was slightly improved as incorporating ratio of Ls increased. Meanwhile, the neutralization depth of both W/C 55 and 45% was indicated at the range of between 5~12㎜, regardless of Ls incorporating ratio. However both W/C 35 and 25%, high strength range, were not invaded by any CO₂, due to the high density. In addition, drying shrinkage length change ratio of specimens decreased as incorporating ratio of Ls increased, during 250 days.

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Abstract
1. 서론
2. 실험계획 및 방법
3. 실험결과 및 분석
4. 결론
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UCI(KEPA) : I410-ECN-0101-2009-540-017484115