Use of Ultra Fine Cement Particles as Crack Repair Materials

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  • 이종열 (쌍용중앙연구소 콘크리트연구실 수석연구원 실장) ;
  • 정연식 (쌍용중앙연구소 콘크리트연구실) ;
  • 이웅종 (쌍용중앙연구소 콘크리트연구실) ;
  • 양승규 (쌍용중앙연구소 콘크리트연구실 연구원) ;
  • 채재홍 (요업기술원 신소재분석평가센터)
  • Published : 2000.10.01

Abstract

In this research we made the mean cement particle size 4 $\mu\textrm{m}$ which can penetrate even minor cracks based on the theory of J.K. Michel who reported particles can penetrate the crack of width up to 3 times of maximum particle size. The cement slurries were produced by adding super plasticizer. The slurries were tested with slurry characterization methods and its rheological properties were characterized. The early hydrated phenomena of ultra fine cement were observed by SEM, XRD and DSC during 24 hours. Mechanical properties of hardened slurry with JIS molds were also tested in 3, 7 and 28 days. The cracked specimens which were repaired with slurries produced various conditions were tested after 3, 7 and 28 days curing in the air and adhesion properties were characterized.

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