Journal of the Korea Concrete Institute (콘크리트학회논문집)

Korea Concrete Institute (한국콘크리트학회)
권호 표지
DOI QR코드

DOI QR Code

An Experimental Study on the High Strength Lightweight Self-Compacting Concrete

고강도경량 자기충전콘크리트에 관한 실험적 연구

  • Published : 2005.12.01
Download PDF
⟨ Previous Next ⟩

Abstract

This paper was to evaluate the high strength lightweight self-compacting concrete(HLSCC) manufactured by Nan-Su, which main factor, Packing Factor(PF) for mixing design, has been modified and improved. We have examined HLSCC performance at its fresh condition as well as its mechanical properties at the hardened condition. The evaluation of HLSCC fluidity has been conducted per the standard of second class rating of JSCE, by three categories of flowability(slump-flow), segregation resistance ability(time required to reach 500mm of slump-flow and time required to flow through V-funnel) and filling ability(U-box test) of fresh concrete. The compressive strength of HLSSC at 28 days has come out to more than 30MPa in all mixes. The relationship between the compressive strength-splitting tensile strength and compressive strength-modulus of elasticity of HLSSC were similar those of typical lightweight concrete. Compressive strength and dry density of HLSCC at 28 days from the multiple regression analysis resulted as $f_c=-0.16LC-0.008LS+50.05(R=0.83)\;and\;f_d=-3.598LC-2.244LS+2,310(R=0.99)$, respectively.

본 연구에서는 Nan-Su의 자기충전콘크리트(Self-Compacting Concrete)의 배합설계 방법중 주요인자인 골재 채움률(Packing Factor : PF)을 수정 및 보완한 배합설계 방법을 이용하여 고강도경량 자기충전콘크리트(High Strength Lightweight Self-Compacting Concrete)를 제조하고 자기충전성 및 역학적 특성을 검토하였다. 콘크리트의 자기충전성 평가는 Slump-flow, V-funnel 유하시간, Slump-flow mm도달시간 및 U-box 충전높이를 측정하여 일본토목학회(JSCE)의 자기충전콘크리트 기준 중 2등급 범위를 적용시켜 검토하였다. 고강도경량 자기충전콘크리트의 재령 뽀일 압축강도는 모든 배합에서 30MPa 이상으로 나타났으며, 압축강도와 쪼갬 인장강도 및 탄성계수의 비는 기존의 연구경향과 유사한 값을 나타내고 있었다 또한, 재령 28일 압축강도와 기건 단위용적질량은 다중회귀분석 결과 $f_c=-0.16LC-0.008LS+50.05(R=0.83)$ 및 $f_d=-3.598LC-2.244LS+2,310(R=0.99)$로 나타났다.

Keywords

References

  1. Yasar E., Atis C. D., Kilic A., and Gulsen H., 'Strength Properties of Lightweight Concrete Made with Basaltic Pumice and Fly-Ash', Materials Letters, Vol.57, Issue15, 2003, pp.2267-2270 https://doi.org/10.1016/S0167-577X(03)00146-0
  2. Kilic A., Atis C. D., Yasar E., and Ozcan F., 'High-Strength Lightweight Concrete Made with Scoria Aggregate Containing Mineral Admixtures', Cement and Concrete Research, Vol.33, Issue10, 2003, pp.1595-1599 https://doi.org/10.1016/S0008-8846(03)00131-5
  3. Aitcin P. C., High- Perfonrance Concrete, E&FN SPON, London, 1938, pp.84 -99
  4. Okamura H., Self-compacting high performance concrete, Social System Institute, Tokyo, 1998, pp.5-15
  5. Okamura H., Maekawa K., and Ozawa K., High Performance Concrete, Gihoudou Pub., Tokyo, 1998, pp.5-21
  6. Nan S. and Miao B., 'A New Method for the Mix Design of Medium Strength Flowing Concrete with Low Cement Content', Cement and Concrete Composite, Vol.25, Issue2, 2003, pp.215-222 https://doi.org/10.1016/S0958-9465(02)00013-6
  7. Nan S., Hsu K. C. and Chai H. W., 'Simple Mix Design Method for Self-Compacting Concrete', Cement and Concrete Research, Vol.31, Issue12, 2001, pp.1700-1807
  8. 최연왕, 정문영, 정지승, 문대중, 안성일, '골재 채움률과 잔골재 용적비를 고려한 자기충전형 콘크리트의 최적비합', 한국콘크리트학회 가을학술발표회논문집, 한국콘크리트학회, 14권 2호, 2002, pp.549-554
  9. 최연왕, 조선규, 최욱, 김경환, 안성일, '간편 배합설계 방법을 통한 중간강도 자기충전콘크리트의 특성', 한국콘크리트학회 봄학술발표회논문집, 한국콘크리트학회 15권 1호, 2003, pp.83-88
  10. ASTM C 29, Atandard Test Method for Unit Weight and Voides in Aggregate, American Society for Testing and Materials, U.S.A, 1997, Vol.4, No.2
  11. JSCE, Japanese Society of Civil Engineering Guide to Construction of high Flowing Concrete, Gihoudou Pub., Tokyo, 1986, 40pp
  12. Lo T. Y., Cui H. Z., and Li Z. G., 'Influence of aggregate pre-wetting and fly ash on mechanical properties of lightweight concrete', Waste Management, Vol.24, Issue4, 2004, pp.333 - 338 https://doi.org/10.1016/j.wasman.2003.06.003

Cited by

  1. A Study on the Quality Properties of Exposed High Fluidity Concrete using Fly Ash and Limestone Powder vol.1, pp.1, 2013, https://doi.org/10.14190/JRCR.2013.1.1.067