• 한국건축시공학회지
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• 제4권4호
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• pp.79-86
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• 2004

The purpose of this study was the development of a recycling process to recover the hydraulic properties of hydration products which account for a large proportion of cementitious powder from concrete waste. This process was performed to recycle cementitious powder as recycle cement. Therefore, after the theoretical consideration of the properties of recycle process of recycled aggregates and cementitious powder, we investigated the hydraulic properties of cementitious powder under various temperature conditions in hardened mortar which was modeled on concrete waste. And we analyzed properties of chemical reactions of recycled cement with admixture materials such as Fly-Ash, Blast Furnace Slag As a result of the experiment, the most effective method to recover hydraulic properties of the cementitious powder from concrete waste was condition of burning at 700℃ for 120 minute. And it is shown that the fluidity of mortar was decreased rapidly when the burning temperature of recycle cement was increased. However, the compressive strength and fluidity were improved significantly when admixture materials such as Fly-Ash or Blast Furnace Slag was added.

• 자원리싸이클링
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• 제14권4호
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• pp.10-16
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• 2005

고속도로 건설 및 유지관리 과정에서 발생되는 폐콘크리트의 현장파쇄 및 재활용을 위하여 파쇄시스템 선정, 순환골재 생산, 도로용 재료의 시방기준 준수여부를 평가하였다. 그 결과 순환골재에 부착된 모르터의 영향으로 천연쇄석에 비하여 낮은 물성값을 나타내었으며, 입도시험결과 임팩트 크러셔 또는 죠, 큰크러셔 조합형은 소요입도에 적합한 순환골재를 생산할 수 있었다. 동상방지층에 적용할 경우 함수비 변동에 의한 건조밀도 변화가 작으므로 천연골재에 비하여 관리가 쉬운 장점이 있으나, 빈배합콘크리트 기층은 시멘트에 의한 미분량 증가로 흡수율의 영향이 감소하였다. 또한 재령 7일 압축강도는 순환골재의 종류에 관계없이 10MPa를 상회하므로 현장적용에는 큰 문제가 없음을 알 수 있었다.