Details
| Originalsprache | Englisch |
|---|---|
| Titel des Sammelwerks | Developments in Strategic Ceramic Materials II |
| Untertitel | A Collection of Papers Presented at the 40th International Conference on Advanced Ceramics and Composites, ICACC 2016 |
| Herausgeber/-innen | Waltraud M. Kriven, Yanchun Zhou, Jingyang Wang, Dongming Zhu, Gustavo Costa |
| Herausgeber (Verlag) | American Ceramic Society |
| Seiten | 109-121 |
| Seitenumfang | 13 |
| Auflage | 7 |
| ISBN (elektronisch) | 9781119321811 |
| ISBN (Print) | 9781119321781 |
| Publikationsstatus | Veröffentlicht - 30 Jan. 2017 |
| Veranstaltung | Developments in Strategic Ceramic Materials II - 40th International Conference on Advanced Ceramics and Composites, ICACC 2016 - Daytona Beach, USA / Vereinigte Staaten Dauer: 24 Jan. 2016 → 29 Jan. 2016 |
Publikationsreihe
| Name | Ceramic Engineering and Science Proceedings |
|---|---|
| Nummer | 7 |
| Band | 37 |
| ISSN (Print) | 0196-6219 |
Abstract
Hardened cement pastes were prepared using CEM I 52,5 N, CEM III/B 42,5 and CEM I 52,5 N with the addition of 50 wt% granulated blast furnace slag (H). IR spectra indicated the destruction of Si-O chains of the CSH-phase in 600°C heated with respect to unheated samples. Series of CEM I 42,5 N hardened cement pastes were heated in 100°C steps up to 800°C. IR spectra indicated a certain variation in the density of states (DOS) of asymmetric Si-O vibrations up to 300°C, followed by a linear decrease in the DOSPM (DOS peak maximum) up to 800°C. This effect is explained by the destruction of the Si-O chain units of the CSH phases. A direct relation of the DOSPM behavior with the stagnation of compressive strength up to 300°C, followed by a linear decrease up to 800°C was proved using mortars prepared based on CEM I 42,5 R with the addition of 20 wt% fly ash. For concrete samples a similar decrease in DOSPM was observed. Alkali activated metakaolin (AAMK) and granulated blast furnace slag (AAH), aged over 6 years show compressive strength of about 60 and 100 MPa for AAH and 35 for AAMK. Heating at 800°C revealed a loss of strength by about 50-80% for AAH but only 20% for MK. For AAH the loss in strength during thermal stress is related to similar effects in the IR spectra also described for breakdown of CSH-phases obtained for CEM-related samples. For AAMK weakening is related to crack formation along Si enriched zones.
ASJC Scopus Sachgebiete
- Werkstoffwissenschaften (insg.)
- Keramische und Verbundwerkstoffe
- Werkstoffwissenschaften (insg.)
- Werkstoffchemie
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Developments in Strategic Ceramic Materials II : A Collection of Papers Presented at the 40th International Conference on Advanced Ceramics and Composites, ICACC 2016. Hrsg. / Waltraud M. Kriven; Yanchun Zhou; Jingyang Wang; Dongming Zhu; Gustavo Costa. 7. Aufl. American Ceramic Society, 2017. S. 109-121 (Ceramic Engineering and Science Proceedings; Band 37, Nr. 7).
Publikation: Beitrag in Buch/Bericht/Sammelwerk/Konferenzband › Aufsatz in Konferenzband › Forschung › Peer-Review
}
TY - GEN
T1 - IR-spectroscopic investigation of geopolymer and CSH-phase stability on heating temperature in post-fired building materials
AU - Rüscher, C. H.
AU - Rigo, E.
AU - Unterderweide, K.
AU - Krauss, H. W.
AU - Jirasit, F.
N1 - Funding information: Acknowledgments. This research work was done within the Josef Ressel-center for heuristic optimization “Heureka!” at the Upper Austria University of Applied Sciences, Campus Hagenberg and is supported by the Austrian Research Promotion Agency (FFG).
PY - 2017/1/30
Y1 - 2017/1/30
N2 - Hardened cement pastes were prepared using CEM I 52,5 N, CEM III/B 42,5 and CEM I 52,5 N with the addition of 50 wt% granulated blast furnace slag (H). IR spectra indicated the destruction of Si-O chains of the CSH-phase in 600°C heated with respect to unheated samples. Series of CEM I 42,5 N hardened cement pastes were heated in 100°C steps up to 800°C. IR spectra indicated a certain variation in the density of states (DOS) of asymmetric Si-O vibrations up to 300°C, followed by a linear decrease in the DOSPM (DOS peak maximum) up to 800°C. This effect is explained by the destruction of the Si-O chain units of the CSH phases. A direct relation of the DOSPM behavior with the stagnation of compressive strength up to 300°C, followed by a linear decrease up to 800°C was proved using mortars prepared based on CEM I 42,5 R with the addition of 20 wt% fly ash. For concrete samples a similar decrease in DOSPM was observed. Alkali activated metakaolin (AAMK) and granulated blast furnace slag (AAH), aged over 6 years show compressive strength of about 60 and 100 MPa for AAH and 35 for AAMK. Heating at 800°C revealed a loss of strength by about 50-80% for AAH but only 20% for MK. For AAH the loss in strength during thermal stress is related to similar effects in the IR spectra also described for breakdown of CSH-phases obtained for CEM-related samples. For AAMK weakening is related to crack formation along Si enriched zones.
AB - Hardened cement pastes were prepared using CEM I 52,5 N, CEM III/B 42,5 and CEM I 52,5 N with the addition of 50 wt% granulated blast furnace slag (H). IR spectra indicated the destruction of Si-O chains of the CSH-phase in 600°C heated with respect to unheated samples. Series of CEM I 42,5 N hardened cement pastes were heated in 100°C steps up to 800°C. IR spectra indicated a certain variation in the density of states (DOS) of asymmetric Si-O vibrations up to 300°C, followed by a linear decrease in the DOSPM (DOS peak maximum) up to 800°C. This effect is explained by the destruction of the Si-O chain units of the CSH phases. A direct relation of the DOSPM behavior with the stagnation of compressive strength up to 300°C, followed by a linear decrease up to 800°C was proved using mortars prepared based on CEM I 42,5 R with the addition of 20 wt% fly ash. For concrete samples a similar decrease in DOSPM was observed. Alkali activated metakaolin (AAMK) and granulated blast furnace slag (AAH), aged over 6 years show compressive strength of about 60 and 100 MPa for AAH and 35 for AAMK. Heating at 800°C revealed a loss of strength by about 50-80% for AAH but only 20% for MK. For AAH the loss in strength during thermal stress is related to similar effects in the IR spectra also described for breakdown of CSH-phases obtained for CEM-related samples. For AAMK weakening is related to crack formation along Si enriched zones.
UR - http://www.scopus.com/inward/record.url?scp=85044271394&partnerID=8YFLogxK
U2 - 10.1002/9781119321811.ch11
DO - 10.1002/9781119321811.ch11
M3 - Conference contribution
AN - SCOPUS:85044271394
SN - 9781119321781
T3 - Ceramic Engineering and Science Proceedings
SP - 109
EP - 121
BT - Developments in Strategic Ceramic Materials II
A2 - Kriven, Waltraud M.
A2 - Zhou, Yanchun
A2 - Wang, Jingyang
A2 - Zhu, Dongming
A2 - Costa, Gustavo
PB - American Ceramic Society
T2 - Developments in Strategic Ceramic Materials II - 40th International Conference on Advanced Ceramics and Composites, ICACC 2016
Y2 - 24 January 2016 through 29 January 2016
ER -