Journal
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
Volume 200, Issue 1-3, Pages 265-270Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jmatprotec.2007.09.008
Keywords
fluidized bed combustion bottom; ash; geopolymer; Compressive strength; freeze-thaw resistance; wet-dry resistance; acid resistance
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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. (c) 2007 Elsevier B.V. All rights reserved.
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