Details
| Original language | English |
|---|---|
| Title of host publication | Developments in Strategic Ceramic Materials - A Collection of Papers Presented at the 39th International Conference on Advanced Ceramics and Composites |
| Editors | Dongming Zhu, Thomas Fischer, Jingyang Wang, Waltraud M. Kriven |
| Publisher | American Ceramic Society |
| Pages | 77-87 |
| Number of pages | 11 |
| Edition | 8 |
| ISBN (print) | 9781119040439 |
| Publication status | Published - 2016 |
| Event | Developments in Strategic Ceramic Materials - 39th International Conference on Advanced Ceramics and Composites, ICACC 2015 - Daytona Beach, United States Duration: 25 Jan 2015 → 30 Jan 2015 |
Publication series
| Name | Ceramic Engineering and Science Proceedings |
|---|---|
| Number | 8 |
| Volume | 36 |
| ISSN (Print) | 0196-6219 |
Abstract
The room temperature strength of mortars using alkali-activated (AA) metakaolin (MK), slag (H), fly ash (B), and their blend systems (MK/H, MK/B) as cements show interesting behavior followed over a period of 2,000+ days. The AAMK mortars gain about 30 MPa in compressive strength within 10 days and do not show any significant weakening for the further time of observation. For pure H related mortar the compressive strength increases gradually up to about 140 MPa. The strength of blended cement based mortars H/MK are between those of H and MK AAB gains about 10 MPa at 60 days strength but increase up to 50 MPa after 2,000+ days surpassing the value of AAMK All blends MK/B remain between the 60 days strength of MKand B. Flexural strength values of all systems show a unique linear increase with compressive strength excluding however H rich systems which tend to saturate at a lower value. Variations in strength during ageing indicate continuous variations in the network of the cement justifying earlier statements. The increase in strength in the AAMK related cements at the beginning of ageing can be explained by the development of two structural units on different time scales: a fast formation of silicate chain units of considerable length and a slow formation of aluminosilicate three dimensional network enclosing the chains. The protection of the chains against destruction by unreacted MK becomes crucial for holding long term high strength. The AAH dominated systems form additionally CSH-type phases which lead to strongly enhanced compressive strength due to enhanced CSH-type chain formation. AAB dominated systems form slowly CSH-type phases which could improve compressive strength values at long term ageing.
ASJC Scopus subject areas
- Materials Science(all)
- Ceramics and Composites
- Materials Science(all)
- Materials Chemistry
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Developments in Strategic Ceramic Materials - A Collection of Papers Presented at the 39th International Conference on Advanced Ceramics and Composites. ed. / Dongming Zhu; Thomas Fischer; Jingyang Wang; Waltraud M. Kriven. 8. ed. American Ceramic Society, 2016. p. 77-87 (Ceramic Engineering and Science Proceedings; Vol. 36, No. 8).
Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review
}
TY - GEN
T1 - Long-term development of mechanical strengths of alkali-activated metakaolin, slag, fly ash, and blends
AU - Jirasit, F.
AU - Rüscher, C. H.
AU - Lohaus, L.
AU - Chindaprasirt, P.
PY - 2016
Y1 - 2016
N2 - The room temperature strength of mortars using alkali-activated (AA) metakaolin (MK), slag (H), fly ash (B), and their blend systems (MK/H, MK/B) as cements show interesting behavior followed over a period of 2,000+ days. The AAMK mortars gain about 30 MPa in compressive strength within 10 days and do not show any significant weakening for the further time of observation. For pure H related mortar the compressive strength increases gradually up to about 140 MPa. The strength of blended cement based mortars H/MK are between those of H and MK AAB gains about 10 MPa at 60 days strength but increase up to 50 MPa after 2,000+ days surpassing the value of AAMK All blends MK/B remain between the 60 days strength of MKand B. Flexural strength values of all systems show a unique linear increase with compressive strength excluding however H rich systems which tend to saturate at a lower value. Variations in strength during ageing indicate continuous variations in the network of the cement justifying earlier statements. The increase in strength in the AAMK related cements at the beginning of ageing can be explained by the development of two structural units on different time scales: a fast formation of silicate chain units of considerable length and a slow formation of aluminosilicate three dimensional network enclosing the chains. The protection of the chains against destruction by unreacted MK becomes crucial for holding long term high strength. The AAH dominated systems form additionally CSH-type phases which lead to strongly enhanced compressive strength due to enhanced CSH-type chain formation. AAB dominated systems form slowly CSH-type phases which could improve compressive strength values at long term ageing.
AB - The room temperature strength of mortars using alkali-activated (AA) metakaolin (MK), slag (H), fly ash (B), and their blend systems (MK/H, MK/B) as cements show interesting behavior followed over a period of 2,000+ days. The AAMK mortars gain about 30 MPa in compressive strength within 10 days and do not show any significant weakening for the further time of observation. For pure H related mortar the compressive strength increases gradually up to about 140 MPa. The strength of blended cement based mortars H/MK are between those of H and MK AAB gains about 10 MPa at 60 days strength but increase up to 50 MPa after 2,000+ days surpassing the value of AAMK All blends MK/B remain between the 60 days strength of MKand B. Flexural strength values of all systems show a unique linear increase with compressive strength excluding however H rich systems which tend to saturate at a lower value. Variations in strength during ageing indicate continuous variations in the network of the cement justifying earlier statements. The increase in strength in the AAMK related cements at the beginning of ageing can be explained by the development of two structural units on different time scales: a fast formation of silicate chain units of considerable length and a slow formation of aluminosilicate three dimensional network enclosing the chains. The protection of the chains against destruction by unreacted MK becomes crucial for holding long term high strength. The AAH dominated systems form additionally CSH-type phases which lead to strongly enhanced compressive strength due to enhanced CSH-type chain formation. AAB dominated systems form slowly CSH-type phases which could improve compressive strength values at long term ageing.
UR - http://www.scopus.com/inward/record.url?scp=84959892487&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:84959892487
SN - 9781119040439
T3 - Ceramic Engineering and Science Proceedings
SP - 77
EP - 87
BT - Developments in Strategic Ceramic Materials - A Collection of Papers Presented at the 39th International Conference on Advanced Ceramics and Composites
A2 - Zhu, Dongming
A2 - Fischer, Thomas
A2 - Wang, Jingyang
A2 - Kriven, Waltraud M.
PB - American Ceramic Society
T2 - Developments in Strategic Ceramic Materials - 39th International Conference on Advanced Ceramics and Composites, ICACC 2015
Y2 - 25 January 2015 through 30 January 2015
ER -