습식 중화반응에 의한 순환 잔골재의 품질 향상 = Quality Improvement of Recycled Fine Aggregate by Neutralization Reaction in Water

국문 초록 (Abstract)

순환골재는 건설폐기물을 재활용함으로써 자원절약 및 대체자원의 개발과 환경보호의 측면에서 국가 사회적으로 많은 이점을 가지고 있다. 하지만 낮은 밀도와 높은 흡수율을 가지는 저품질 순환골재는 구조용 콘크리트 골재로 사용되지 못하고 주로 저부가가치로 사용되고 있다. 고품질 순환골재를 생산하기 위해서는 골재와 골재에 부착된 구모르타르를 효과적으로 제거해야 한다. 최근 물리적 화학적 방법을 이용하여 구모르타르를 효율적으로 제거하기 위한 연구가 행해지고 있으나, 고품질 순환잔골재의 생산 조건에 관한 정량적 연구는 아직 부족한 실정이다. 따라서 본 연구에서는 고품질 순환잔골재를 생산하기 위해서 황산과 저속습식마쇄기를 이용하여 구모르타르를 효과적으로 제거할 수 있는 최적 조건을 제시하고자 하였다. 황산의 몰비와 골재비율에 따른 순환골재의 실험결과 밀도, 흡수율, 실적율은 기준을 만족시키는 결과를 나타내고 있는 것을 알 수 있었다.

다국어 초록 (Multilingual Abstract)

Recycled aggregate by the recycling construction waste has a lot of advantage such as the developing the alternative resource and protecting of environment. However, recycled aggregate is used as the low quality grade, because it is difficult to remove old mortar from aggregate. To use the recycled aggregate as high quality grade, it is important to develop the technology to produce the high quality recycled aggregate. To manufacture the high quality recycled aggregate, old mortar attached on the aggregates should be removed efficiently. Therefore, in this study, we suggested the optimum condition to remove old mortar effectively using sulfuric acid and low speed wet rotary mill for high quality recycled fine aggregate. The results shows that the recycled aggregate satisfy on the standards of KS F 2573 in density, absorption and solid volume, when adequate condition of sulfuric mole ratio and aggregate ratio are make.

참고문헌 (Reference)

1 Michihiko Abe, "recycled aggregate concrete concrete engineering" 35 (35): 42-48, 1997

2 Kim J. M., "Study of the quality of circulation bone material by grinding method using a CO2 gas" 20 (20): 344-348, 2006

3 MOILT, "Studies on the long-term stability of the recycled aggregate and recycled aggregate concrete structures of structure" Minister of Land, Infrastructure and transport 2005

4 LHI, "Recycling policy and technology development trend of construction waste" Land&Housing institute 2006

5 MOILT, "Quality standards of the recycling of construction waste and measures to promote" Minister of Land, Infrastructure and transport 2002

6 Kim J. M., "Experimental study on physical properties of circulation bone material by acid treatment" 20 (20): 331-335, 2006

7 MOILT, "A study on the development of recycling phosphorus system and recycling technology of the construction industry waste" Minister of Land, Infrastructure and transport 1997

8 Kim H. S., "A fundamental study on the manufacrure of high quality recycled fine aggregate by experiment design" 19 (19): 617-620, 2007