2011 Fiscal Year Final Research Report

Material Characteristics and Leaching Behaviour of Recycled Bassanite as Soil improvement Effects from Waste Plaster Boards

Research Project

Project/Area Number	21560527
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Single-year Grants
Section	一般
Research Field	Geotechnical engineering
Research Institution	Fukuoka University
Principal Investigator	SATO Kenichi 福岡大学, 工学部, 教授 (20235336)
Co-Investigator(Kenkyū-buntansha)	OSHIKATA Toshiro 福岡大学, 研究推進部, 教授 (60465713)
Project Period (FY)	2009 – 2011
Keywords	再生半水石膏 / 土質改良 / 高含水比泥土 / 改良強度特性 / フッ素 / 溶出特性 / 硫化水素
Research Abstract	The recycling process of leftover gypsum boards from new construction and demolition sites currently requires intermediate treatment. The boards are separated into their paper and gypsum components and the non-recyclable components are discarded into controlled landfills. However, problems such as landfill capacity shortage and the refusal of privately owned landfills to accept such materials have made the recycling of discarded gypsum an urgent challenge. Bassanite produced by heat-treating the dihydrate gypsum obtained from discarded gypsum boards, solidifies when water is added. Therefore, research is underway into the exploitation of this characteristic of bassanite for the development of a soil improvement material. In this study, we investigate the applicability of recycled bassanite as a material for soil improvement using existing soil.