Details
| Original language | English |
|---|---|
| Title of host publication | Strategic Materials and Computational Design - A Collection of Papers Presented at the 34th International Conference on Advanced Ceramics and Composites |
| Pages | 17-34 |
| Number of pages | 18 |
| Edition | 10 |
| Publication status | Published - 27 Sept 2010 |
| Event | Strategic Materials and Computational Design - 34th International Conference on Advanced Ceramics and Composites, ICACC - Daytona Beach, FL, United States Duration: 24 Jan 2010 → 29 Jan 2010 |
Publication series
| Name | Ceramic Engineering and Science Proceedings |
|---|---|
| Number | 10 |
| Volume | 31 |
| ISSN (Print) | 0196-6219 |
Abstract
Geopolymerisation of an optimally alkali activated metakaolin cement was investigated in dependence on time by strength measurements, by infrared and Raman spectroscopy, and by the molybdate tracer method. The increase in flexural strength at the beginning of aging is explained by the development of two main structural units on different time scales: a fast formation of polymeric silicate chain type (polysiloxo) units and a slow formation of a three dimensional network crosslinking the chains and including sialate bondings. However during further aging a significant weakening occured due to the fragmentation and incorporation of the chain units into the aluminosilicate body. Variations in the waterglass to metakaolin ratio decreasing the nominative K/Al and Si/Al ratio produced about the same binder phase but led to a significant portion of unreacted metakaolin. Further silicate and aluminosilicate cements were synthesized based on rice husk-bark ash, slag, and combinations with slag and metakaolin. It is concluded that the formation and crosslinking of long silicate chains becomes crucial for gaining high mechanical strength and that the protection of the silicate chains becomes crucial for holding long time high strength. This protection is given in the presence of unresolved metakaolin and becomes more pronounced with the addition of significant amounts of CaO together with highly reactive SiO2 source material (Slag).
ASJC Scopus subject areas
- Materials Science(all)
- Ceramics and Composites
- Materials Science(all)
- Materials Chemistry
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Strategic Materials and Computational Design - A Collection of Papers Presented at the 34th International Conference on Advanced Ceramics and Composites. 10. ed. 2010. p. 17-34 (Ceramic Engineering and Science Proceedings; Vol. 31, No. 10).
Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review
}
TY - GEN
T1 - New insights on geopolymerisatton using molybdate, Raman, and infrared spectroscopy
AU - Rüscher, C. H.
AU - Mielcarek, E.
AU - Wongpa, J.
AU - Jirasit, F.
AU - Lutz, W.
PY - 2010/9/27
Y1 - 2010/9/27
N2 - Geopolymerisation of an optimally alkali activated metakaolin cement was investigated in dependence on time by strength measurements, by infrared and Raman spectroscopy, and by the molybdate tracer method. The increase in flexural strength at the beginning of aging is explained by the development of two main structural units on different time scales: a fast formation of polymeric silicate chain type (polysiloxo) units and a slow formation of a three dimensional network crosslinking the chains and including sialate bondings. However during further aging a significant weakening occured due to the fragmentation and incorporation of the chain units into the aluminosilicate body. Variations in the waterglass to metakaolin ratio decreasing the nominative K/Al and Si/Al ratio produced about the same binder phase but led to a significant portion of unreacted metakaolin. Further silicate and aluminosilicate cements were synthesized based on rice husk-bark ash, slag, and combinations with slag and metakaolin. It is concluded that the formation and crosslinking of long silicate chains becomes crucial for gaining high mechanical strength and that the protection of the silicate chains becomes crucial for holding long time high strength. This protection is given in the presence of unresolved metakaolin and becomes more pronounced with the addition of significant amounts of CaO together with highly reactive SiO2 source material (Slag).
AB - Geopolymerisation of an optimally alkali activated metakaolin cement was investigated in dependence on time by strength measurements, by infrared and Raman spectroscopy, and by the molybdate tracer method. The increase in flexural strength at the beginning of aging is explained by the development of two main structural units on different time scales: a fast formation of polymeric silicate chain type (polysiloxo) units and a slow formation of a three dimensional network crosslinking the chains and including sialate bondings. However during further aging a significant weakening occured due to the fragmentation and incorporation of the chain units into the aluminosilicate body. Variations in the waterglass to metakaolin ratio decreasing the nominative K/Al and Si/Al ratio produced about the same binder phase but led to a significant portion of unreacted metakaolin. Further silicate and aluminosilicate cements were synthesized based on rice husk-bark ash, slag, and combinations with slag and metakaolin. It is concluded that the formation and crosslinking of long silicate chains becomes crucial for gaining high mechanical strength and that the protection of the silicate chains becomes crucial for holding long time high strength. This protection is given in the presence of unresolved metakaolin and becomes more pronounced with the addition of significant amounts of CaO together with highly reactive SiO2 source material (Slag).
UR - http://www.scopus.com/inward/record.url?scp=79952417217&partnerID=8YFLogxK
U2 - 10.1002/9780470944103.ch3
DO - 10.1002/9780470944103.ch3
M3 - Conference contribution
AN - SCOPUS:79952417217
SN - 9780470921913
T3 - Ceramic Engineering and Science Proceedings
SP - 17
EP - 34
BT - Strategic Materials and Computational Design - A Collection of Papers Presented at the 34th International Conference on Advanced Ceramics and Composites
T2 - Strategic Materials and Computational Design - 34th International Conference on Advanced Ceramics and Composites, ICACC
Y2 - 24 January 2010 through 29 January 2010
ER -