Alkali-activated binders: Early age nucleation reactions, chemical phase evolution and their implications on system properties

Journal article


Sagoe-Crentsil, Kwesi and De Silva, Premalatha. (2015) Alkali-activated binders: Early age nucleation reactions, chemical phase evolution and their implications on system properties. Journal of the Chinese Ceramic Society. 43(10), pp. 1449 - 1457. https://doi.org/10.14062/j.issn.0454-5648.2015.10.15
AuthorsSagoe-Crentsil, Kwesi and De Silva, Premalatha
Abstract

Formation of polymeric cementitious binders via alkaline activation of aluminosilicates has gained significant attention within the manufacturing and building sectors in recent years. Given the diversity of aluminosilicate source materials employed in these systems, such as fly ash, blast furnace slag, calcined kaolinite, etc., the chemistry of raw materials play a crucial role in both kinetics and stability of solid phase evolution which govern chemical and physical properties of resultant products. This paper analyses the effects on elemental composition of raw materials on the overall alkaline activation process; from dissolution to end-product properties. A range of analytical techniques including X-ray synchrotron analysis has been used to characterise amorphous and zeolitic domains from a range of raw materials. In particular, the tendency of aluminosilicate source materials with defined amorphous SiO2/Al2O3 ratios to nucleate sodium aluminosilicate zeolitic phases originating from Na2O–Al2O3–SiO2–H2O gel assemblages is investigated, alongside the dominant influence of Ca ions and residual cationic species based on identifiable compositional domains within ternary phase diagrams. Stable phase assemblages and optimal compositional ranges for different systems are discussed with respect to phase development, microstructural changes and their relationship to long term strength development and chemical resistance.

Keywordsgeopolymer; X-ray synchrotron; alumino-silicates; fly ash; metakaolin; zeolites
Year2015
JournalJournal of the Chinese Ceramic Society
Journal citation43 (10), pp. 1449 - 1457
PublisherZhongguo Guisuanyan Xuehui, Chinese Ceramic Society
ISSN0454-5648
Digital Object Identifier (DOI)https://doi.org/10.14062/j.issn.0454-5648.2015.10.15
Scopus EID2-s2.0-84948777047
Open accessOpen access
Page range1449 - 1457
Research GroupSchool of Behavioural and Health Sciences
Publisher's version
Place of publicationChina
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