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싸이클론을 적용한 건식 생산공정으로 생산된 재생 잔골재의 품질 및 모르터 특성에 관한 연구
이세현(Lee Sea-Hyun),심종우(Shim Jong-Woo) 대한건축학회 2004 大韓建築學會論文集 : 構造系 Vol.20 No.6
This study is intended for how to utilize the recycled fine aggregate which is produced by concrete wastes.<br/> It analyzes the quality of the fine aggregate which is reproduced through a dry production process with cyclone, and<br/> comprehends the characteristics of mortar using the recycled fine aggregate to review whether it can be put to practical use for<br/> concrete. The conclusions of the study are as follows<br/> 1. The recycled fine aggregate through the dry production process with cyclone shows the low rate of absorption and<br/> impurity content after the cyclone process. It shows that its density is 2.37, absorption rate is 4.8 and stability is 5.1% and less.<br/> Therefore, it satisfies the standards of KS F 2573(recycled aggregate for concrete) as the first grade.<br/> 2. Compared to the mortar made from natural fine aggregate, another using recycled one reduces the flow when the rate of<br/> mix increases. The mortar of the 100% recycled fine aggregate reduces the flow to the maximum 15% comparing to that of<br/> 100% natural one.<br/> The compressive strength of mortar using the dry recycled fine aggregate tends to be reduced according to the increase of<br/> the mixing rate of recycled fine aggregate at the beginning, but as time passes, it shows that the compressive strength of<br/> mortar using the recycled fine aggregate is fall off to that of natural one as the increase of mixing rate of fine aggregate.<br/> Based on the above results, the recycled fine aggregate through the dry production process with cyclone satisfies the quality<br/> standards of the first-grade recycled fine aggregate of KS F 2573 (recycled fine aggregate for concrete) and it is concluded that<br/> the recycled fine aggregate can be used as fine aggregate because its characteristics are similar to the natural one when the<br/> mortar is produced.
순환골재 혼합비율 및 시멘트량 변화에 따른 순환골재 콘크리트의 물리적 특성에 관한 연구
이세현 ( Sea-hyun Lee ) 한국폐기물자원순환학회(구 한국폐기물학회) 2020 한국폐기물자원순환학회지 Vol.37 No.2
This study compared and analyzed the physical characteristics of slump, air volume, and compressive strength according to the cyclic aggregate mixing ratio and the change of cement. According to the circulating aggregate, the slump showed satisfactory results of 190 ± 15 mm, which is the standard in all formulations. In addition, the change in air volume over the plain showed a similar pattern. The compressive strength of circulating aggregate concrete showed the same strength as the plain, and the application of circulating aggregate did not lead to no significant decrease in strength. We concluded that achieving the target strength of 27 MPa would require about 10 kg/m<sup>3</sup> more cement than that of general concrete.