Journal of the Korea Institute of Building Construction (한국건축시공학회지)

The Korean Institute of Building Construction (한국건축시공학회)
권호 표지
DOI QR코드

DOI QR Code

Effect of Fiber Addition for Improving the Properties of Lightweight Foamed Concrete

경량 기포콘크리트의 성능향상에 대한 섬유혼입의 영향

  • Lee, Kyung-Ho (Department of Architectural Engineering, Graduate School, Kyonggi University) ;
  • Yang, Keun-Hyeok (Department of Plant.Architectural Engineering, Kyonggi University)
  • Received : 2015.03.12
  • Accepted : 2015.06.04
  • Published : 2015.08.20
Download PDF
⟨ Previous Next ⟩

Abstract

The objective of this study is to develop mixture proportioning approach of crack controlled lightweight foamed concrete without using high-pressure steam curing processes, as an alternative to autoclaved lightweight concrete blocks (class 0.6 specified in KS). To control thermal cracks owing to hydration heat of cementitious materials, 30% ground granulated blast-furnace slag (GGBS) was used as a partial replacement of ordinary portland cement (OPC). Furthermore, polyvinyl alcohol (PVA) and polyamid (PA) fibers were added to improve the crack resistance of foamed concrete. The use of 30% GGBS reduced the peak value of hydration production rate measured from isothermal tests by 28% and the peak temperature of foamed concrete measured from semi-adiabatic hydration tests by 9%. Considering the compressive strength development, internal void structure, and flexural strength of the lightweight foamed concrete, the optimum addition amount of PVA or PA fibers could be recommended to be $0.6kg/m^3$, although PA fiber slightly preferred to PVA fiber in enhancing the flexural strength of foamed concrete.

ALC 블록(0.6품) 성능 수준의 습식형 경량 기포콘크리트 배합설계 제시를 위하여 7배합의 섬유가 혼입된 기포콘크리트 배합실험을 수행하였다. 수화열에 의한 온도균열제어를 위해 결합재에 고로슬래그를 30% 치환하였으며, 기포콘크리트의 균열저항성을 높이기 위하여 PVA 및 PA섬유를 혼입하였다. 고로슬래그를 30% 치환한 결합재는 시멘트 100% 대비 최대 열발생률 및 콘크리트 내부 최고 온도를 각각 28% 및 9% 저감시킬 수 있었다. 실험결과 섬유가 혼입된 경량기포 콘크리트의 압축강도, 공극분포, 휨 강도를 고려하면 PVA 및 PA 섬유 $0.6kg/m^3$ 혼입이 추천될 수 있었다.

Keywords

References

  1. Korea Concrete Institute. New Concrete Engineering. Korea: Kimoondang Publishing Company; 2001. 930 p.
  2. Song H. Improvement of Physical Property of Autoclaved Light-Weight Concrete Using Admixtures and Chemical Reactants. Journal of The Korean Digital Architecture.Interior Association. 2012 Dec;12(4):87-91.
  3. Kim YY, Song H, Lee JK, Chu YS. Improvement of Fundamental Properties in ALC Added Admixtures and Silica Powder Size. Architectural Institute of Korea. 2007 Aug;13(8):107-111.
  4. Yang KH, Lee KH. Test on High-Performance Aerated Concrete with a Lower Density. Construction and Building Materials. 2015 Jan;74(15):109-117. https://doi.org/10.1016/j.conbuildmat.2014.10.030
  5. Xia Y, Yan Y, Hu Z. Utilization of Circulating Fluidized Bed Fly Ash in Preparing Non-Autoclaved Aerated Concrete Production. Construction and Building Materials. 2013 Oct;47:1461-1467. https://doi.org/10.1016/j.conbuildmat.2013.06.033
  6. Yang L, Yan Y, Hu Z. Utilization of Phosphogypsum for the Preparation of Non-Autoclaved Aerated Concrete. Construction and Building Materials. 2013 Jul;44:600-606. https://doi.org/10.1016/j.conbuildmat.2013.03.070
  7. Lee KH. Development of Mixture Proportioning Model for Low-Density High-Strength Foamed Concrete [master's thesis]. [Korea]: Kyonggi University; 2013. 103 p.
  8. Jaung JD, Cho HD, Park SW. Properties of Hydration Heat of High-Strength Concrete and Reduction Strategy for Heat Production. The Korea Institute of Building Construction. 2012 Apr;12(2):203-210. https://doi.org/10.5345/JKIBC.2012.12.2.203
  9. KS F 4039. Foamed Concrete for Cast-in-Site: Korean Industrial Standards; 2009. 1-8.
  10. Lee DH, Jun MH, Ko JS. Physical Properties and Quality Control of Foamed Concrete with Fly Ash for Cast-in-Site. Journal fo the Korea Concrete Institute. 2001 Feb;13(1):69-76.
  11. KS F 2701. Autoclaved Lightweight Aerated Concrete Block: Korean Industrial Standards; 2012. 1-6.
  12. Kim YS, Kim DH, Jee NY. The Properties of Internal Temperature of Paste and Concrete according to Component Ratio Variation of Ternary System Cement. Journal of the Korea Concrete Institute. 2008 Dec;20(6):797-807. https://doi.org/10.4334/JKCI.2008.20.6.797
  13. Esmaily H. Nuranian H. Non-autoclaved high strength cellular concrete from alkali-activated slag. Construction and Building Materials. 2012 Jan;26(1):200-206. https://doi.org/10.1016/j.conbuildmat.2011.06.010