Geopolymers Made Using New Zealand Flyash

Dan S. PERERA; Catherine L. NICHOLSON; Mark G. BLACKFORD; Ross A. FLETCHER; Rachael L. TRAUTMAN

doi:10.14852/jcersjsuppl.112.0.S108.0

Journal of the Ceramic Society of Japan, Supplement 112-1, PacRim5 Special Issue

Session ID : 1

DOI https://doi.org/10.14852/jcersjsuppl.112.0.S108.0

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Host: The Ceramic Society of Japan

Co-host: Iketani Science and Technology Foundation, International Ceramic Federation, Commemorative Organization for the Japan World Exposition '70, The American Ceramic Society, The Australasian Ceramic Society, The Chinese Ceramic Society, The Korean Ceramic Society, Joint Research Consortium of Synergy Ceramics/Fine Ceramics Research Association, Nanotechnology Researchers Network Center of Japan, The Special Coordination Funds for Promoting Science and Technology, Japan National Tourist Organization, Aichi Prefectural Government, CASIO SCIENCE PROMOTION FOUNDATION, DAIKO FOUNDATION, Nagoya Convention and Visitors Bureau, The Asahi Glass Foundation, The Kao Foundation For Arts And Sciences, The Murata Science Foundation, The Ogasawara Foundation for the Promotion of Science & Engineering, ASAHI GLASS CO., LTD. Research Center, CENTRAL GLASS CO., LTD., ELECTRIC GLASS INDUSTRY ASSOCIATION OF JAPAN (EGAJ), Hattori Company, Ltd., Hitachi Research Laboratory, Hitachi, Ltd., HOYA CORPORATION, INAX Corporation, ITOCHU CERATECH CORP., Japan Cement Association, KYOCERA Corporation, KYUSHU REFRACTORIES CO., LTD., MINO CERAMIC CO., LTD., Murata Manufacturing Co., Ltd., NGK INSULATORS LTD., NGK SPARK PLUG CO., LTD., NICHIAS Corporation, NIKKO COMPANY, Nippon Electric Glass Co., Ltd., Nippon Sheet Glass Co., Ltd., NORITAKE CO., LIMITED, Tokuyama Corporation, TOTO LTD.

Papers

Geopolymers Made Using New Zealand Flyash

Dan S. PERERA, Catherine L. NICHOLSON, Mark G. BLACKFORD, Ross A. FLETCHER, Rachael L. TRAUTMAN

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Keywords: Geopolymer, Fly ash, Strength, Porosity, SEM, TEM, Aluminosilicte, Inorganic polymers

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Abstract

Geopolymers synthesised using New Zealand fly ash have been investigated for their potential application as matrices for encapsulation and immobilisation of hazardous and radioactive waste. Knowledge of the long-term behaviour and macroscopic and microscopic properties of these materials will be essential. Pastes aged for between 1 day and 2 years after were investigated in this study. The material exhibited a complex microstructure, consisting of both crystalline and amorphous regions. While no changes in crystalline phases were detected in fresh and aged samples, significant differences in porosity and surface area were noted on ageing of the samples. Very high early strengths of 85 MPa were achieved but were observed to decline in samples after 7 days ageing. It is believed that on-going reactions within the geopolymer matrix are contributing to these changes after the material has set and hardened.

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