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Abstract Summary
Conference:
105th Annual Meeting & Exposition
Instructions
and
Links
Symposium:
20. Ceramic Matrix Composites
Session:
Geopolymer Composites -
1:00:00 PM - 5:00:00 PM 4/28/2003
Abs. Title:
What Are These Things Called Geopolymers? A Physico-Chemical Perspective
Abstract #:
7454
Type:
Invited
Submitted:
12/1/2002 10:08:32 PM
Status:
Accepted
Scheduled?
Yes
Abstract:
Geopolymers may be defined in a number of ways, in terms of their principal constituents (alumina and silica), their structure (tetrahedral Al-O and Si-O units in a random 3-D framework charge-balanced by alkali ions), their synthesis (room-temperature condensation of alumina and silica sources at high pH) or their properties (moderately strong and hard, stable to at least 1000?C). As a result of the recent upsurge of interest in environmentally friendly and energy-efficient materials and processes, geopolymers, which behave as ceramics but are formed at ambient temperature, have attracted increasing attention. One result is that the generic term is tending to be used more loosely and indiscriminately for any mineral material bonded with alkali metal silicate, irrespective of its structure and properties. As an approach to defining the necessary and sufficient conditions for obtaining true geopolymerisation, this talk introduces some of the known synthetic and structural chemistry of well-defined conventional aluminosilicate geopolymers and compares these with other silicate-bonded materials. Since true geopolymers are essentially X-ray amorphous, solid state nuclear magnetic resonance studies have been used to provide vital information about the atomic environments of the constituent elements (Si, Al, Na, K) during and after polymerisation. These results, together with studies of the thermophysical, X-ray and NMR characteristics of true geopolymers at high temperatures will be discussed in relation to their structure in an attempt to identify the essential features of true geopolymerisation.
Abstract Author(s)
1
Primary and Presenting
Kenneth J.D. MacKenzie -
1004723
Organization
Victoria University of Wellington
Phone #
64-4-569-0513
Fax #
64-4-569-0412
Professional Title
IRL Professor of Materials Chemistry
Street Address
PO Box 31-310
City
Lower Hutt
State
Province
Country
New Zealand
Postal Code
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