An Experimental Study on the Development of Lightweight Concrete

경량콘크리트의 개발에 관한 실험적 연구

  • Published : 1995.10.01

Abstract

This study was performed to develop the lightweight concrete using synthetic lightweight aggregate and natural coarse aggregate. Mixing ratios were three types, the first type was mixed cement and synthetic lightweight fine aggregate (Type CP), the second type was mixed cement, synthetic lightweight fine aggregate and synthetic lightweight coarse aggregate (Type CPE), the third type was mixed cement, synthetic lightweight fine aggregate and natural coarse aggregate (Type CPN). The results of this study are summarized as follows ; 1. The W/C of each mixing ratio was increased with increase of the amount of cement used, and it was shown higher in order of Type CP, CPN, CPE. 2. The unit weight of Type CP, CPE and CPN was 1.473~1.647g/cm$^3$, 1.467~1.622g/cm$^3$ and 1.658~1 .838g/cm$^3$, respectively. And the absorption ratio was approximately 20%, which was higher than that of the normal cement concrete. 3. The compressive strength of Type CP was shown 178 ~249kg/cm2, Type CPE was shown 149~241kg/cm$^2$ and Type CPN was shown 196~297kg/cm$^2$, respectively. Each strength ratio was smaller than that of the normal cement concrete. 4. The pulse velocity of Type CP, CPE and CPN was 2, 688~3, 240m/sec, 2, 981~3, 324m/sec and 2, 989 ~ 3, 545m/sec, respectively. And it was increased with increase of strength and unit weight. 5. The length change ratio at 28 days was in the range of 0.057~0.077%, and earlier length change ratio was higher than that of the later.

Keywords

References

  1. 대한건축학회지 v.21 no.74 경량골재콘크리트 및 기타에 관한 각국의 발명특허 홍사천
  2. 한국건설기술연구원 연구보고서 국내 콘크리트 구조물의 내구성 평가를 위한 조사연구 한국건설기술연구원
  3. 최신콘크리트공학 한국콘크리트학회
  4. 한국농공학회지 v.36 no.4 초경량골재를 사용한 경량콘크리트의 공학적 특성 성찬용;김성완;민정기
  5. BS 1881 Methods of testing hardened concrete for other than strength British Standards Institution
  6. RILEM v.14 no.19 Dynamic properties of hardened paste, mortar and concrete Swamy,R.N.;G.Rigby
  7. Lightweight Concrete Andrew Short
  8. Lightweight Concrete Lightweight aggregates on updating of materials, production, technology, innovations and inventions Venuat,M.
  9. Properties of Concrete Nevile
  10. Journal of the ACI v.81 no.2 The use of pulse velocity measurements to estimate strength of air-dried cubes and hence in situ strength of concrete Swamy,R.N.;A.H.Al-Hamed
  11. Pundit manual for use with the portable ultrasonic non-destructive digital indicating tester(Mark V) C.N.S.Electronics LTD