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http://dx.doi.org/10.4334/JKCI.2010.22.4.559

Air Content, Workability and Bleeding Characteristics of Fresh Lightweight Aggregate Concrete  

Sim, Jae-Il (Dept. of Architectural Engineering, Kyonggi University)
Yang, Keun-Hyeok (Dept. of Architectural Engineering, Kyonggi University)
Publication Information
Journal of the Korea Concrete Institute / v.22, no.4, 2010 , pp. 559-566 More about this Journal
Abstract
Fifteen lightweight concrete mixes were tested to evaluate the effect of maximum size of coarse aggregate and the replacement level of natural sand on the various properties of fresh lightweight concrete. The different properties, such as water absorption against the elapsed time, pore size distribution and micro-structure of lightweight aggregates used, influencing on the workability of fresh concrete were also measured. Test results showed that the initial slump of lightweight concrete decreased with the increase of the replacement level of natural sand. The slump of all-lightweight concrete sharply decreased by around 80% of the initial slump after 30~60 minutes. The air content and bleeding rate of lightweight concrete were significantly affected by the replacement level of natural sand as well as the maximum size of coarse aggregates. Empirical equations recommended in ACI 211 and Korea concrete standard specifications underestimated the air content of the lightweight concrete, indicating that the underestimation increases with the decrease of the replacement level of natural sand. In addition, equations to predict the air content and bleeding rate of lightweight concrete were proposed based on the test results.
Keywords
lightweight concrete; slump; air content; bleeding; maximum aggregate size;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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1 일본건축학회, “건설공사표준시방.동해설,” JASS 5 철근콘크리트공사, 1997, 806 pp.
2 류택동, 이시우, 서치호, “혼화재를 첨가한 인공경량골재 콘크리트의 강도특성에 관한 연구,” 대한건축학회 논문집, 9권, 6호, 1993, pp. 177-185.
3 한종훈, 김태섭, 김화중, 오창희, “혼화재를 사용한 고강도 경량콘크리트의 강도성상에 관한 실험적 연구,” 대한건축학회 논문집, 9권, 9호, 1993, pp. 213-221.
4 전현규, 홍순조, 서치호, “고유동 경량골재콘크리트의 특성에 고나한 실험적 연구,” 대한건축학회 논문집, 17권, 4호, 2001, pp. 71-78.
5 한국공업표준협회, KS 기준안, 한국공업표준협회, 2006.
6 최재진, “콘크리트 배합설계 및 품질관리 프로그램 개발,” 레미콘.아스콘.골재, 73호, 5호, 2002, pp. 44-49.
7 이승조, 박정민, 김화중, “가넷미분말을 활용한 고강도 경량콘크리트의 역학특성에 관한 연구,” 대한건축학회논문집, 20권, 7호, 2004, pp. 85-92.
8 서치호, “경량콘크리트의 성상에 관한 실험적 연구,” 한양대학교 박사학위논문, 1985, 154 pp.
9 是石俊文, “シラスを利用した非燒成人工輕量骨材の諸性質について,” コソクリ一ト工學, Vol. 16, No. 5, 1978, pp. 109-119.
10 한국콘크리트학회, 최신 콘크리트공학, 기문당, 2001, 689 pp.
11 Zhang, M. H. and Gjorv, O. E., “Characteristics of Lightweight Aggregate for High-strength Concrete,” ACI Materials Journal, Vol. 88, No. 2, 1991, pp. 150-158.
12 Zhang, M. H. and Gjorv, O. E., “Mechanical Properties of High-Strength Lightweight Concrete,” ACI Materials Journal, Vol. 88, No. 3, 1991, pp. 240-247.
13 Videla, C. and Lopez, M., “Mixture Proportioning Methodology for Structural Sand-Lightweight Concrete,” ACI Materials Journal, Vol. 97, No. 3, 1997, pp. 281-289.
14 국토해양부, “콘크리트표준시방서” 한국콘크리트학회, 2009, 300 pp.
15 Slate, F. O., Nilson, A. H. and Martinez, S., “Mechanical Properties of High-Strength Lightweight Concrete,” ACI Journal, Vol. 83, No. 4, 1986, pp. 606-613.
16 양근혁, 오승진, 송진규, “경량골재를 사용한 알칼리 활성 슬래그 콘크리트의 역학적 특성,” 콘크리트학회 논문집, 20권, 3호, 2008, pp. 405-412.   과학기술학회마을   DOI   ScienceOn
17 Neville, A. M., Properties of Concrete, Longman, 1995, 844 pp.
18 ACI Committee 211, “Standard Practice for Selection Proportion for Structural Lightweight Concrete (ACI 211.2-98),” ACI Manual of Concrete Practice, Part 1. American Concrete Institute, Detroit, Michigan, 1983, 20 pp.
19 Pfeifer, D. W. and Hanson, J. A., “Sand Replacement in Structural Lightweight Concrete Sintering Grate Aggregares,” ACI Journal, 1967, pp. 121-127.
20 문종옥, 원종필, 전현규, “경량콘크리트의 적용 및 사례,” 한국콘크리트학회 경량콘크리트 전문위원회, 2006, pp. 224-239.