Biotechnology and Bioprocess Engineering:BBE

The Korean Society for Biotechnology and Bioengineering (한국생물공학회)
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Production of Extracellular Polysaccharide, EPS WN9, from Paenibacillus sp. WN9 KCTC 8951P and Its Usefulness as a Cement Mortar Admixture

  • Kahng, Goong-Gjung (Department of Food Processing and Architectire Engineering, Chinju National University) ;
  • Lim, Seo-Hyung (Architectire Engineering, Chinju National University) ;
  • Yun, Han-Dae (Department of Agricultural Chemistry, Gyeongsang National University) ;
  • Seo, Weon-Taek (Department of Food Processing and Architectire Engineering, Chinju National University)
  • Published : 2001.03.01
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Abstract

The production of extracellular polysaccharide, EPS WN9, from Paenibacillus sp. and its suitability as a viscosity modifying admixture for cement mortar mixing were investigated. After 48h culture in an optimized medium, cell growth and EPS production were 1.2g/L and 4.0g/L, respectively. By adding EPS WN9 to mortar, it was possible to prepare a homogeneous mortar without material segregation and excess air entrapment. The optimal amount of EPS addition to mortar found to be 0.02 to 0.05%(w/w) of the cement used. Increasing the dosage of EPS WN9 from 0 to 0.05%(w/w) resulted in a setting retardation of 0.14h to 0.8h and an increase in the compressive strength of mortar of 10 to 20%.

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References

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