Geopolymer prepared with high-magnesium nickel slag: characterization of properties and microstructure

Yang, Tao and Yao, Xiao and Zhang, Zuhua (2014) Geopolymer prepared with high-magnesium nickel slag: characterization of properties and microstructure. Construction and Building Materials, 59. pp. 188-194. ISSN 0950-0618

Abstract

High-magnesium nickel slag (HMNS) is a hazardous waste that is generated in nickel pyrometallurgical production. The present work investigates the feasibility of using this slag in geopolymer manufacturing. The effects of HMNS addition on the reaction, mechanical properties and microstructure of fly ash-based geopolymers are studied through isothermal conduction calorimetry (ICC), compressive strength testing, mercury intrusion porosimetry (MIP), scanning electron microscopy (SEM), X-ray diffractometry (XRD) and drying shrinkage testing. The results showed that the major phase in fly ash-HMNS geopolymers was a type of sodium magnesium aluminosilicate gel (N–M–A–S) with amorphous features. The Si/Al ratio of the gel phase increased with HMNS content due to the high silica supplied by HMNS. In terms of compressive strength, the maximal strength of fly ash-based geopolymers was achieved by 20% HMNS substitution. At this optimal content, the sample possessed a refiner pore structure and lower linear drying shrinkage compared with the other samples containing 0%, 40% and 60% HMNS contents. This study shows the potential of incorporating HMNS as value source material for geopolymer production.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: © 2014 Published by Elsevier Ltd. 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: 04 Aug 2014 01:53
Last Modified: 31 Mar 2015 04:40
Uncontrolled Keywords: geopolymer; nickel slag; fly ash; alkaline activation; drying shrinkage
Fields of Research : 09 Engineering > 0905 Civil Engineering > 090503 Construction Materials
09 Engineering > 0912 Materials Engineering > 091201 Ceramics
09 Engineering > 0907 Environmental Engineering > 090703 Environmental Technologies
Socio-Economic Objective: B Economic Development > 86 Manufacturing > 8610 Ceramics, Glass and Industrial Mineral Products > 861001 Cement and Concrete Materials
Identification Number or DOI: 10.1016/j.conbuildmat.2014.01.038
URI: http://eprints.usq.edu.au/id/eprint/25045

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