Preparation of geopolymer from fluidized bed combustion bottom ash

✍ Scribed by R. Slavik; V. Bednarik; M. Vondruska; A. Nemec

• Book ID: 104023874
• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 986 KB
• Volume: 200
• Category: Article
• ISSN: 0924-0136
• DOI: 10.1016/j.jmatprotec.2007.09.008

✦ Synopsis

This study has shown that it is possible to use fluidized bed combustion bottom ash (FBC-BA) without any thermal activation as a partial-or full-replacement for kaolinitic raw material in geopolymerization. Test specimens prepared from FBC-BA have reached compressive strength of almost 50 MPa after 90 days of hardening. After 50 freeze-thaw cycles, the compressive strength of test specimens has not decrease below 80% of compressive strength of unaffected reference specimens, which represents an acceptable freeze-thaw resistance.

Testing of wet-dry resistance has shown that wet-dry cycles cause an increase of the compressive strength values. Testing of acid resistance of prepared geopolymer specimens has shown that replacement of usual kaolinitic raw material by FBC-BA results in slight increase of leachability.