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Articles by H.J. Lee
Total Records ( 2 ) for H.J. Lee
  J.H. Seo and H.J. Lee
  Legume with low C-to-N is more getting acceptance as an alternative to nitrogen (N) fertilizer because of high price of N fertilizer recently. Amounts of fresh aboveground hairy vetch equivalent to N rates of 80, 160 and 240 kg ha-1 were incorporated into soil as alternative N source for two years of maize in Suwon, Korea and were compared to the same N amounts applied as N fertilizer, ammonium nitrate. Soil organic N was increased considerably by hairy vetch. Dry matter (DM) yields of maize increased more in hairy vetch than ammonium nitrate with N rates over 160 kg ha-1. Maize N yields were not different between two N sources with N rates under 160 kg ha-1, but was higher in hairy vetch than ammonium nitrate with N rate 240 kg ha-1 showing superior mineral N alternative of hairy vetch to N fertilizer at high N rate.
  E.A. Seo , D.G. Kim , H.J. Lee and N.W. Yang
  This study evaluated the durability of concrete substituted with 20% Fly Ash (FA20) and concrete substituted with 50% ground granulated Blast furnace Slag (BS50) for use in nuclear power plants. The experimental variables were admixture type and water-binder ratio. The measured durability characteristics were compressive strength, chloride-attack resistance and resistance to freezing and thawing. BS50 had lower initial strength but better compressive strength as a function of aging than FA20. The results of resistance against chloride attack and freezing and thawing showed that as the water-binder ratio decreased the resistance was improved, regardless of admixture type. In particular, resistance against chloride attack and the mass loss rate due to freezing and thawing in the BS50 mix were approximately 1.3 and 2.2 times higher, respectively as compared to the FA20 mix. Conclusively, the BS50 mix was better than the FA20 mix in terms of chloride attack and freezing-thawing durability.
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