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세척수 종류별 마쇄에 따른 순환 잔골재의 품질 변화에 대한 실험적 연구
선정수,김재원,김하석,임대빈,이도헌,김진만 대한건축학회지회연합회 2006 대한건축학회지회연합회 학술발표대회논문집 Vol.2 No.1
The purpose of study is to improve the quality of recycled fine aggregate thet is generated from waste concrete. It is experimented with Abrasional Crusher over a kind of washning water. And Used it is carbonated water, acid water . Test items is the density, absorption ratio, passing ratio, XRD and XRF . As a result of the study, the more old mortal that is contained in the recycled fine aggregate through Abrasional Crusher process is removed, the better the quality of recycled fine aggregate is improved
황산수와 저속 습식 마쇄법으로 생산한 순환잔골재를 사용한 모르터의 압축강도에 관한 실험적 연구
김하석,선정수,곽은구,임대빈,이도헌,김진만 대한건축학회지회연합회 2007 대한건축학회지회연합회 학술발표대회논문집 Vol.2007 No.1
Waste concrete has been increased by an acceleration of the development of urban and the enlargement of redevelopment projects, so recycling of waste concrete is actively progressed. However the usage is limited to a lower value-add such as the roadbed material etc. Now, the research and the development have been performed to produce the high quality recycled aggregate. However recycled fine aggregate has low quality because it contains large amount of old mortar. Thus to produce the high quality recycled aggregate, breaking and washing process must be added to the existing process and the ingredient of old mortar must be removed from aggregate. Also, alkaline water which occur from treatment process of the waste concrete is becoming the cause of environmental problem. Accordingly, this research is to develop on the high quality recycled fine aggregate produced by low speed wet abraser using sulfur and investigated the engineering properties of the mortar used the recycled fine aggregate by this process. Test results indicate that recycled fine aggregate by acid treatment process satisfies the quality standards of KS F 2573 (recycled fine aggregate for concrete) for the first-grade recycled fine aggregate. It is also shown that strength of mortar using recycled fine aggregate by this process was great to that using recycled fine aggregate removed under 0.15mm powder by sieving.
황산 처리 공정에 의해 제조한 고품질 순환잔골재를 사용한 콘크리트의 공학적 특성에 관한 실험적 연구
최덕진,이대근,김하석,강철,임대빈,김진만 대한건축학회지회연합회 2008 대한건축학회지회연합회 학술발표대회논문집 Vol.2008 No.1
Recycled fine aggregate has low quality because it contains large amount of old mortar. So, its usage is limited to a lower value-add, such as the roadbed material etc. Also, alkaline water occurred from treatment process of the waste concrete is becoming the cause of environmental problem. Accordingly, this study is to develop on the high quality recycled fine aggregate produced by low speed wet abraser using sulphuric. We investigated the properties of compressive strength of the mortar which was manufactured using recycled fine aggregate containing calcined gypsum produced by earlier mentioned process. Test results indicate that concrete using recycled fine aggregate containing calcined gypsum is higher compressive strength than concrete using other sands.