Compositional, microstructural and mechanical properties of ambient condition cured alkali-activated cement

Zhang, Zuhua and Li, Liangfeng and Ma, Xue and Wang, Hao (2016) Compositional, microstructural and mechanical properties of ambient condition cured alkali-activated cement. Construction and Building Materials, 113. pp. 237-245. ISSN 0950-0618

Abstract

As an alternative binder, alkali-activated fly ash/slag blend cement is attractive in practice due to controllable
setting behaviour at ambient temperature conditions. This study investigates the mineralogical and elemental compositions in six alkali-activated cements (AACs) prepared by sodium silicate-activated ternary systems of fly ash, slag and silica fume at ambient conditions. X-ray diffractometry (XRD) and scanning electron microscopy (SEM) coupled with energy-dispersive X-ray spectroscopy (EDS) show
the poorly crystalline and extremely heterogeneous nature of reaction products at 1 year. Around residual fly ash particles N-(C)-A-S-H gels present with relatively high Al/Si ratios, 0.6–1.0, and probably high polymerization degree. The Al/Si ratio decreases gradually in the gel towards residual slag particles at micrometre scale, and becomes C-(N)-A-S-H around slag particles. There is no clear
compositional boundary to separate the two hybrid gels. Comparing with the composition of the gel, the porosity and pore structure are more relative and determining to the compressive strength development of the AACs.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to Published version in accordance with the copyright policy of the publisher.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Mechanical and Electrical Engineering
Date Deposited: 08 Mar 2017 01:14
Last Modified: 19 Mar 2017 22:42
Uncontrolled Keywords: alkali-activated cement, geopolymer
Fields of Research : 09 Engineering > 0905 Civil Engineering > 090502 Construction Engineering
09 Engineering > 0912 Materials Engineering > 091202 Composite and Hybrid Materials
Identification Number or DOI: 10.1016/j.conbuildmat.2016.03.043
URI: http://eprints.usq.edu.au/id/eprint/30838

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