폐콘크리트를 굵은 골재의 대체 재료로 재활용하게 되면, 건설폐기물의 증가위기와 천연골재의 고갈문제를 해결해 줄 수 있다. 그러나 순환골재는 콘크리트용 골재의 품질보다 저하되는 경향이 있기 때문에, 이를 개선하여 콘크리트 재료로 활용해야 한다. 순환골재 콘크리트의 내구성에 관한 논문은 부족한 실정이므로, 본 연구에서는 염화물 확산계수에 의해 포졸란재를 혼입한 순환골재 콘크리트의 염화물 확산성에 대한 기초적인 자료를 제시하는데 그 목적이 있다. 주요 결과로는 다음과 같다. 1) 재령에 따라 포졸란재를 혼입한 순환골재 콘크리트의 ...
폐콘크리트를 굵은 골재의 대체 재료로 재활용하게 되면, 건설폐기물의 증가위기와 천연골재의 고갈문제를 해결해 줄 수 있다. 그러나 순환골재는 콘크리트용 골재의 품질보다 저하되는 경향이 있기 때문에, 이를 개선하여 콘크리트 재료로 활용해야 한다. 순환골재 콘크리트의 내구성에 관한 논문은 부족한 실정이므로, 본 연구에서는 염화물 확산계수에 의해 포졸란재를 혼입한 순환골재 콘크리트의 염화물 확산성에 대한 기초적인 자료를 제시하는데 그 목적이 있다. 주요 결과로는 다음과 같다. 1) 재령에 따라 포졸란재를 혼입한 순환골재 콘크리트의 압축강도가 증가하였으며, 염화물 확산성은 감소하였다. 2) 모든 재령에서, 순환굵은골재의 치환율이 30%인 경우 고로슬래그 및 메타카올린을 혼입한 순환골재 콘크리트의 염화물 확산계수는 플레인 콘크리트와 유사하거나 더 낮은 결과를 나타내었다.
폐콘크리트를 굵은 골재의 대체 재료로 재활용하게 되면, 건설폐기물의 증가위기와 천연골재의 고갈문제를 해결해 줄 수 있다. 그러나 순환골재는 콘크리트용 골재의 품질보다 저하되는 경향이 있기 때문에, 이를 개선하여 콘크리트 재료로 활용해야 한다. 순환골재 콘크리트의 내구성에 관한 논문은 부족한 실정이므로, 본 연구에서는 염화물 확산계수에 의해 포졸란재를 혼입한 순환골재 콘크리트의 염화물 확산성에 대한 기초적인 자료를 제시하는데 그 목적이 있다. 주요 결과로는 다음과 같다. 1) 재령에 따라 포졸란재를 혼입한 순환골재 콘크리트의 압축강도가 증가하였으며, 염화물 확산성은 감소하였다. 2) 모든 재령에서, 순환굵은골재의 치환율이 30%인 경우 고로슬래그 및 메타카올린을 혼입한 순환골재 콘크리트의 염화물 확산계수는 플레인 콘크리트와 유사하거나 더 낮은 결과를 나타내었다.
The purpose of this study is to investigate chloride diffusivity of recycled aggregate concrete containing pozzolanic materials by coefficient of chloride diffusion. The specimens were made with recycled coarse aggregate as various replacement ratio (10, 30, 50%). And metakaolin, blast furnace slag,...
The purpose of this study is to investigate chloride diffusivity of recycled aggregate concrete containing pozzolanic materials by coefficient of chloride diffusion. The specimens were made with recycled coarse aggregate as various replacement ratio (10, 30, 50%). And metakaolin, blast furnace slag, fly ash is replaced for recycled concrete with mixing ratio 20%. The results of the experiment are as follow.
1) According as replacement ratio of recycled aggregate increased, it was observed that the amount of superplaticizer decreased. This is because that the shape of recycled aggregate is more round than domestic crushed stones. And the use of pozzolanic powder make the amount of superplasticizer decrease for obtaining the same slump value.
2) The compressive strength of concrete containing recycled aggregate was lower than plain concrete. But, when the pozzolanic powder such as metakaolin, blast furnace slag was replaced, the compressive strength of recycled concrete was improved. In case mixing ratio of recycled aggregate was 30%, the use of 20% metakaolin make recycled concrete's compressive strength be higher than plain concrete except for the other pozzolanic powders.
3) Using the recycled aggregate, the coefficient of chloride diffusion was higher than plain concrete. When the mixing ratio of recycled aggregate was same, the coefficient of chloride diffusion that using 20% of metakaolin, blast furnace slag was lower than other concretes with 11～26% range.
4) When the mixing ratio of recycled aggregate was 30%, 50%, the metakaolin was excellent for restraining chloride diffusion of which coefficient was lowest of all. The result of using blast furnace slag was similar that of plain concrete. Consequently, it was observed that the mixing ratio of recycled aggregate would increase as selected a appropriate pozzolanic powder.
5) As a result of observing microstructure, there are many micro-crack in the recycled concrete. When the pozzolanic powder such as metakaolin, blast furnace slag was replaced to remedy recycled aggregate's fault, the internal structure of recycled concrete was densified because of pozzolanic reaction.
Hereinafter, the study on the recycled concrete chemical properties changing is needed under the condition of chloride diffusion using DSC-TG and X-ray analysis with examination of the deterioration mechanism of chloride diffusion. Futhermore, to reinforce the coherence between cement paste and recycled aggregate, it is necessary that the accelerative method for improving the property of recycled aggregate.
The purpose of this study is to investigate chloride diffusivity of recycled aggregate concrete containing pozzolanic materials by coefficient of chloride diffusion. The specimens were made with recycled coarse aggregate as various replacement ratio (10, 30, 50%). And metakaolin, blast furnace slag, fly ash is replaced for recycled concrete with mixing ratio 20%. The results of the experiment are as follow.
1) According as replacement ratio of recycled aggregate increased, it was observed that the amount of superplaticizer decreased. This is because that the shape of recycled aggregate is more round than domestic crushed stones. And the use of pozzolanic powder make the amount of superplasticizer decrease for obtaining the same slump value.
2) The compressive strength of concrete containing recycled aggregate was lower than plain concrete. But, when the pozzolanic powder such as metakaolin, blast furnace slag was replaced, the compressive strength of recycled concrete was improved. In case mixing ratio of recycled aggregate was 30%, the use of 20% metakaolin make recycled concrete's compressive strength be higher than plain concrete except for the other pozzolanic powders.
3) Using the recycled aggregate, the coefficient of chloride diffusion was higher than plain concrete. When the mixing ratio of recycled aggregate was same, the coefficient of chloride diffusion that using 20% of metakaolin, blast furnace slag was lower than other concretes with 11～26% range.
4) When the mixing ratio of recycled aggregate was 30%, 50%, the metakaolin was excellent for restraining chloride diffusion of which coefficient was lowest of all. The result of using blast furnace slag was similar that of plain concrete. Consequently, it was observed that the mixing ratio of recycled aggregate would increase as selected a appropriate pozzolanic powder.
5) As a result of observing microstructure, there are many micro-crack in the recycled concrete. When the pozzolanic powder such as metakaolin, blast furnace slag was replaced to remedy recycled aggregate's fault, the internal structure of recycled concrete was densified because of pozzolanic reaction.
Hereinafter, the study on the recycled concrete chemical properties changing is needed under the condition of chloride diffusion using DSC-TG and X-ray analysis with examination of the deterioration mechanism of chloride diffusion. Futhermore, to reinforce the coherence between cement paste and recycled aggregate, it is necessary that the accelerative method for improving the property of recycled aggregate.
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