Effect of Adding of II-Anhydrite and Superplasticizer on the Fluidity of Cement Paste

II형 무수석고 및 고유동화제 첨가가 시멘트 페이스트의 유동성에 미치는 영향

  • Kim, Jae-Ho (Dept. of Fine Chemicals Engineering and Chemistry, College of Engineering, Chungnam National Univ.) ;
  • Kim, Do-Su (Dept. of Fine Chemicals Engineering and Chemistry, College of Engineering, Chungnam National Univ.) ;
  • Lee, Beom-Jae (Dept. of Fine Chemicals Engineering and Chemistry, College of Engineering, Chungnam National Univ.) ;
  • Rho, Jae-Seong (Dept. of Fine Chemicals Engineering and Chemistry, College of Engineering, Chungnam National Univ.)
  • 김재호 (충남대학교 공과대학 정밀공업화학과) ;
  • 김도수 (충남대학교 공과대학 정밀공업화학과) ;
  • 이범재 (충남대학교 공과대학 정밀공업화학과) ;
  • 노재성 (충남대학교 공과대학 정밀공업화학과)
  • Received : 1997.10.25
  • Accepted : 1998.03.30
  • Published : 1998.06.10

Abstract

A comparative study on the effects of mean particle diameter and substitutional ratio of II-anhydrite on the fluidity of cement paste has been conducted. Three different mean particle diameters(4, 14 and $35{\mu}m$) and four different substitution ratios(3, 5, 10, 15wt%) have been tested while the dosage of two superplasticizers - naphtalenic(NSF) and polycarboxylic(NT-2) - has been varied from 0 to 2.0wt%. To investigate the effects of those parameters, the variation in fluidity and apparent viscosity of the cement paste has been observed as a function of the elapsed time. The initial fluidity of the cement paste is more affected by the increase in substitution ratio than by the mean particle size of the II-anhydrite. When the substitution ratio of the II-anhydrite is fixed at 10wt%, addition of 1.0wt% NT-2 improves the fluidity of paste cement more than that for NSF. This case has showed the best improvement of the fluidity in the range of parameters investigated. At the addition of 1.0wt% NT-2, apparent viscosity of the cement paste has been noticeably decreased as substitutional ratio of II-anhydrite increases. It was found that it would be more effective to substitute II-anhydrite at a certain ratio to improve the fluidity of the cement paste, in addition to adding NT-2.

Keywords

References

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