Estimation of gypsum hemihydrate content in recycled gypsums derived from gypsum boards

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• 作者：Shinya Inazumi ; Hiroaki Sano ; Mikio Yamada
• 关键词：Density ; Gypsum dihydrate ; Gypsum hemihydrate ; Thermal behavior
• 刊名：Journal of Material Cycles and Waste Management
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：18
• 期：1
• 页码：168-176
• 全文大小：764 KB
• 参考文献：1.Gypsum Board Association of Japan (2012) Gypsum board handbook
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• 作者单位：Shinya Inazumi (1)
  Hiroaki Sano (2)
  Mikio Yamada (3)
  
  1. Department of Civil Engineering, Akashi College, National Institute of Technology, 679-3, Nishioka, Uozumi, Akashi, Hyogo, 6748501, Japan
  2. Department of Civil and Environmental Engineering, Oita College, National Institute of Technology, 1666, Maki, Oita, Oita, 8700152, Japan
  3. Department of Civil Engineering, Fukui College, National Institute of Technology, Geshi, Sabae, Fukui, 9168507, Japan
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Environment
  Waste Management and Waste Technology
  Environmental Management
  Industrial Pollution Prevention
  
• 出版者：Springer Japan
• ISSN：1611-8227

文摘

In order to utilize reclaimed gypsums (gypsum board waste) derived from waste plasterboards as geo-materials, thermal behaviors of the reclaimed gypsums and reagent gypsum are investigated in this paper. Furthermore, simple density measuring method of judging quality of the reclaimed gypsums is examined to determine the gypsum hemihydrate content. As the results, it was found that the dihydrate gypsum is changed into the hemihydrate gypsum under thermal condition of 90 °C and the hemihydrate gypsum is changed into anhydrite under that of 120 °C with heating of 24 h. The followings were clarified in this paper. The cement density measuring method was available in order to measure the density of reclaimed gypsums; that density depended on the drying conditions of the reclaimed gypsums; and the density measuring method was appropriate to estimate the gypsum hemihydrate content in reclaimed gypsums. Furthermore, it was found that the quality control method based on the density was effective by calculating the gypsum hemihydrate content from the density values of reclaimed gypsums. Keywords Density Gypsum dihydrate Gypsum hemihydrate Thermal behavior