[pp.77-84]

A Study on Recycling of Waste Gypsum Boards and Application to Foundation Works

Katsunori ONISHI,Takeshi FUJINO and Takashi ASAEDA （Sekisui Chemical Co., Ltd. / Saitama University）

Abstract:
With high fire-resistant and sound insulation properties and low price, gypsum boards are used in large quantities for interior walls and ceilings of residential and many other buildings. However, as the Ministry of the Environment (2002) says in “Research on Promotion of Recycling Waste Gypsum Boards,” a report published by the Waste Management and Recycling Department in December 2002, 1-36, hydrogen sulfide occurs from final disposal of waste gypsum boards in forms of offcuts and rubble generated from the construction of new buildings and demolition of old buildings. Since this problem has been on the rise in recent years, there is an urgent call for the development of a recycling process or other effective solutions to the issue. Under these circumstances, the author focused attention on applications in building foundations as a recycling application that takes advantage of the characteristics of waste gypsum boards and carried out a study on them, to consequently establish the techniques of recycling waste gypsum boards into a raw material and using it for foundation work.

Key Word:
Gypsum board, waste, recycling, foundation work, gypsum hemihydrate

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