Experimental Study on the Strength Improvement and the Long Term Durability of Shotcrete mixed Micro-Silica Fume

실리카 흄을 혼입한 숏크리트의 강도증진과 장기내구특성에 관한 실험적 연구

  • 마상준 (한국건설기술연구원 지반연구부) ;
  • 김동민 (한국건설기술연구원 지반연구부) ;
  • 장필성 (한국건설기술연구원 지반연구부) ;
  • 최재석 (한국건자재시험연구원 신뢰성평가센터)
  • Published : 2006.06.30

Abstract

In this study, field test was performed to investigate the strength-improvement effect of shotcrete mixed Micro-silica fume and shotcrete quality was estimated by EFNARC standard. Deterioration test combined the Freezing-thawing and Carbonation was also performed in order to investigate a long-term durability of high-strength shotcrete. As a result of test, the compressive strength of shotcrete using Micro-silica fume was 45.2~55.8MPa and flexible strength was 5.01~6.66MPa, so a promotion ratio of strength was 37~79%, 17~61% respectively. And the strength-improvement effect of strength by silica fume addition ratio of 7.5~10% for cement mass was more superior to the others. Due to relative dynamic modulus, mass decrease rate and carbonation progress of shotcrete mixed Micro-silica fume, it was especially realized that Micro-silica fume reduced deterioration caused by steel fiber and improved a long-term durability of shotcrete.