A Study on the Expansive Properties With Particle Size Distribution of Expansive Additives in Mortar

팽창제의 입도분포에 따른 팽창특성에 대한 기초연구

  • 이종열 (쌍용중앙연구소 콘크리트연구실 수석연구원) ;
  • 이웅종 (쌍용중앙연구소 콘크리트연구실) ;
  • 박정준 (쌍용중앙연구소 콘크리트연구실 연구원) ;
  • 박경상 (쌍용중앙연구소 콘크리트연구실 연구원) ;
  • 김기수 (쌍용중앙연구소 콘크리트연구실 실장)
  • Published : 1998.10.01

Abstract

Concrete structures is appeared the shrinkage after being harden of the hydration effect of cement. To overcome this disadvantage, expansive additives are used. In our country, the most popular expansive additives are hauyne(CSA) or free lime(free-CaO) systems. These expansive additives are used to expansive cement mortar or concrete materials. In this study, we analyzed the expansive property mechanism about the hydration reaction of the free lime systems and in particular we convinced size distributions of the free lime size affect the expansion ratio with expansion ratio with experiments. We carried out the experiment for the expansive properties by using the soundness molds and with various the humidity and dry setting conditions. The hydration reactions of the free lime affect the reaction properties according to the relative humidity by laboratory experiments.

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