JOURNAL BROWSE
Search
Advanced SearchSearch Tips
A Experimental Study on the Material Charateristics of Crushed Aggregate Produced in Quarry
facebook(new window)  Pirnt(new window) E-mail(new window) Excel Download
 Title & Authors
A Experimental Study on the Material Charateristics of Crushed Aggregate Produced in Quarry
Baek Dong-Il; Youm Chi-Sun; Kim Myung-Sik;
  PDF(new window)
 Abstract
An investigation for long-term strength characteristics of crushed sand concrete using crushed sands produced in Yang-san, Kim-hae and Jin-hae that can be assumed to respectively represent eastern, middle and western suburbs of Busan has been carried out. Concrete is composed of of aggregates in whole volume so the effect of aggregates quality to the characteristics of concrete is very important. Since 1980s, aggregates used in concrete have already been substituted crushed stone because of the exhaustion of natural gravel and sand. Crushed sand tends to increase in using quantity because of the prohibition of sea sand picking and deterioration of river sand. Crushed sand is blended with river sand in order to investigate the quality changes and characteristics of concrete as variation of blend ratio of crushed sand (n, 50, 70, 80, 90, ). Slump and air content were measured to investigate the properties of fresh concrete. Unit weight, compressive strength and modulus of elasticity in age of 7, 28, 60, n, 180 days were measured to investigate properties of hardened concrete. Compressive strength, unit weight and modulus of elasticity were increased with a passage of time and they are expected to keep on increasing in long-term age as well. The experimental results of the qualifies of crushed aggregates in each producing area, were all satisfied with Korea Standard. The results of the measurement of slump exposed that slump preferably decreased as mixing rate increased till but it increased to mixing rate . The air content was exposed that it decreased by micro filler phenomenon according to that crushed sand b)ended ratio increased. According to the result of measuring unit weight in age of 7, 28, 60, 90, 180days, it increased in accordance with that blended ratio of crushed aggregates increases. As a result of measuring compressive strength and modulus of elasticity in age of 7, 28, 50, 90, 180days, compressive strength was highest when it is of blended ratio.
 Keywords
crushed aggregates;air content;unit weight;compressive strength;modulus of elasticity;
 Language
Korean
 Cited by
 References
1.
김병환, '콘크리트용 부순돌과 부순모래의 생산 및 품질,' 콘크리트학회지, 9권, 2호, 1997. 4, pp.4-12

2.
최민수, 지역별 골재 소비구조 분석 및 수급 안정방안, 한국건설산업연구원, 2003. 4, pp.14-16

3.
한천구, 윤기원, 이진규 외 3인, '부순모래의 미립분 함유량 및 입형이 콘크리트의 특성에 미치는 영향에 관한 연구', 한국콘크리트학회 가을학술발표회 논문집, 8 권 2호, 1996.11, pp.17-23

4.
대한주택공사 주택연구소, 콘크리트용 부순모래의 실용화 방안 연구, 대한주택공사, 1996. 12, pp.5-12

5.
이성복, 이도헌, 지남용, 이리형, '잔입자 함유량 및 입형 변화에 따른 부순모래 콘크리트의 배합설계 방법에 관한 연구', 대한건축학회논문집, 13권, 5호, 1997. 5, pp.289-298

6.
박세윤, 잔골재의 혼합비율 변화에 따른 수중불분리성 콘크리트의 특성에 관한 연구, 부경대학교 대학원, 2004. 2, pp.19

7.
이승환, 윤용호, '대구.경북지역 생산 부순모래의 특성에 관한 연구', 계명대학교 산업기술연구소 논문집, 26권, 1호, 2003, pp.303-312

8.
한국콘크리트학회편, 최신콘크리트공학, 기문당, 1997. 10, pp.109-170

9.
한국콘크리트학회편, 부순모래 및 부순모래 콘크리트, 한국콘크리트학회, 1998. 6, pp.62-81

10.
한천구, 콘크리트의 특성과 배합설계, 기문당, 1998. 7

11.
한국콘크리트학회편, 콘크리트표준시방서 해설, 기문당, 2004. 2, pp.95-121

12.
Frank P. Nichols, Jr., 'Manufactured Sand and Crushed Stone in Portland Cement Concrete', Concrete International, ACI, Aug. 1982, pp.56-63

13.
Ahmed E. Ahmed and Ahmed A EI-Koued, 'Properties of Concrete Incorporating Nature and Crushed Stone Very Fine Sand', ACI Materials Journal, Vol.86, No.4, Jul.-Aug. 1989, pp.417-424

14.
A M Neville, Properties of Concrete, 4th Edition, John Wiley and Sons, Malaysia, 1996. 7, pp.182-237