Microstructural analysis of geopolymers using fused slags with transmission electron microscopy
1
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
The amount of fused slag generated is continuously increasing and is expected to reach 50,000 tons per year as coal gasificationfacilities and waste treatment systems producing fused slag have been actively adopted recently in Korea. One of theprospective solutions is to make geopolymers with the slags because geopolymers are a cement substitute that can reduce thegeneration of carbon dioxide and have thus attracted increasing interest from recycling and eco-friendly constructionindustries because they provide sufficient mechanical strength for application in construction materials. There has not yet beena comprehensive microscopic investigation of geopolymers or diffraction pattern analysis of the crystallites produced bygeopolymerization. Geopolymers made of fused slags with an alkali activator exhibited very high compressive strengthcompared with those of ordinary geopolymers, and their microscopic structures were analyzed by transmission rlectronmicroscopy (TEM) to confirm the formation of crystallites during the geopolymerization and to explain the relationshipbetween the microstructure and mechanical property of the geopolymers. At least two types of phases, C-S-H and Ca(OH)2,have been identified by selected area diffraction (SAD) pattern analyses on the crystallites in the geopolymer matrix.
Abstract
The amount of fused slag generated is continuously increasing and is expected to reach 50,000 tons per year as coal gasificationfacilities and waste treatment systems producing fused slag have been actively adopted recently in Korea. One of theprospective solutions is to make geopolymers with the slags because geopolymers are a cement substitute that can reduce thegeneration of carbon dioxide and have thus attracted increasing interest from recycling and eco-friendly constructionindustries because they provide sufficient mechanical strength for application in construction materials. There has not yet beena comprehensive microscopic investigation of geopolymers or diffraction pattern analysis of the crystallites produced bygeopolymerization. Geopolymers made of fused slags with an alkali activator exhibited very high compressive strengthcompared with those of ordinary geopolymers, and their microscopic structures were analyzed by transmission rlectronmicroscopy (TEM) to confirm the formation of crystallites during the geopolymerization and to explain the relationshipbetween the microstructure and mechanical property of the geopolymers. At least two types of phases, C-S-H and Ca(OH)2,have been identified by selected area diffraction (SAD) pattern analyses on the crystallites in the geopolymer matrix.
참고문헌 (26)
- C. Ferone, , Materials, 6(8), pp.3420~3437 (2013)
- X. Guo, , J. Cons and Build. Mater, 56, pp.81~86 (2014)
- J. He, , J. Cons and Build. Materials, 30, pp.80~91 (2012)
- G. Habet, , J. Clean. Prod, 19(11), pp.1229~1238 (2011)
- P. Duxson, , J. Mater. Sci, 42(9), pp.2917~2933 (2007)
- P. Duxson, , Cem. and Concr. Res, 37(12), pp.1590~1597 (2007)
- J. Davidovits, "Geopolymer Institute" (1999), Saint Qunentin
- K. Sakkas, , Tunnel. and Under. Space. Tech, 43, pp.148~156 (2014)
- J. Davidovits, "Geopolymer '88" (1988), The Institute
- A. Buchwald, , J. Non-Cryst. Solids, 357, pp.1376~1382 (2011)
- P. Duxson, , Colloids and Surfaces A, 269, pp.47~58 (2005)
- B. H. W. S. de Jong, , Geoch. et Cosm. Acta, 44(3), pp.491~511 (1980)
- H. Xu, , Cem. and Concr. Res, 32, pp.1705~1716 (2002)
- I. Lecomte, , J. Eur. Ceram. Soc, 26, pp.3789~3797 (2006)
- C. Meral, , Cem. and Concr. Res, 41, pp.696~710 (2011)
- M. Criado, , Cem. and Concr. Res, 37, pp.671~679 (2007)
- Z. Xie, , Cem. and Concr. Res, 31, pp.1245~1249 (2011)
- Z. Zhang, , Therm. Acta, 539, pp.23~33 (2012)
- W. Lee, , Cem. and Concr, 34, pp.195~206 (2004)
- C. Kuenzel, , J. Eur. Ceram. Soc, 33, pp.251~258 (2013)
- V. Barbosa, , Mater. Lett, 57, pp.1477~1482 (2003)
- L. Liu, , Mater. Lett, 66, pp.10~12 (2012)
- Y. Kim, , AES Tech. Revi. Int. J, 1, pp.29~40 (2014)
- J. Van Jaarsveld, , Mater. Lett, 57, pp.1272~1280 (2003)
- P. Chindaprasirt, , Waste Management, 30, pp.667~672 (2010)
- 손세구, "Synthesis of Mullite Powders by the Geopolymer Technique", 한국세라믹학회지, 45(5), pp.303~308 (2008), 한국세라믹학회