Development of solidification technology for fluorine contaminated Bassanite using Portland blast-furnace (B) cement

• KAMEI Takeshi

  Department of Materials Creation and Circulation Technology, Graduate School of Shimane University

• HORAI Hideto

  Nikko Co. Ltd.

Bibliographic Information

Other Title

• 高炉セメントＢ種による半水石膏のフッ素不溶化技術の開発

Abstract

During the three stages of production, construction and demolition, approximately 1.5 million tons of waste plasterboard was generated in 2007. Bassanite is produced by heating gypsum obtained from waste plasterboard, under conditions of 130°C or more. <br>Engineering properties make bassanite obtained from waste plasterboard useful as an improver for soft soils. However, fluorine contents may exceed the approved value in the Japanese environmental quality standard. We have to investigate, therefore, reduction in the solubility or mobility of fluorine, physically and chemically. To overcome this, we developed a solidification technology for fluorine contaminated Bassanite using Portland blast-furnace (B) cement. The concentration of fluorine decreases with increasing curing time and bassanite content. The concentration of fluorine after treatment using Portland blast-furnace (B) cement became lower than the Japanese environmental quality standard value.

Journal

• Japanese Geotechnical Journal

  Japanese Geotechnical Journal 4 (1), 91-98, 2009

  The Japanese Geotechnical Society

Keywords

• bassanite
• engineering development
• fluorine
• unconfined compressive strength
• waste plasterboard

Details

• CRID: 1390282680234112768
• NII Article ID: 130004482785
• DOI: 10.3208/jgs.4.91
• ISSN: 18806341
• Text Lang: ja
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed