JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2008, Vol. 32 ›› Issue (05): 89-94.doi: 10.3969/j.jssn.1000-2006.2008.05.018

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The effects of wood-gypsum ratio, water-gypsum ratio and temperature on the properties of the gypsum sawdust board

LUO Jia-yan1, HAN Zheu-hua1, DENG Yu-he1, ZAI De-xin2, LEI Wen2, XUAN Ling1, ZHOU Mei1   

  1. 1. College of Wood Science and Technology Nanjing Forestry Uaiversity, Nanjing 210037, China; 2. College of Information Science and Technology Nanjing Forestry Universily, Nanjing 210037, China
  • Online:2008-10-18 Published:2008-10-18

Abstract: The relationship betweeu wood-gypsum ratio and water gypsum ratio was studied. The effects of temperature on hydration process, the hydration system and the morphology of gypsum were explored by analyzing the concentration of Ca2+in tire hydrating system and the morphology of gypsum crystals. In addition, the physical and mechanical properties of the gypsum sawdust board were analyzed. The results showed that these ratios satisfied the formula,to=0. 54x+0.28. each water-gypsum ratio has a corresponding wood-gypsum ratio to fit. The water-gypsum ratio and the corresponding wood-gypsum ratio wouht make the board’s properties best together. These ratios satisfied when the temperature was 40℃, the gypsum hydration time shortened and the board had high strength. The application of this condition shortened the production petted and improved the effieieney.

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