Conversion of local industrial wastes into greener cement through geopolymer technology: a case study of high-magnesium nickel slag

Zhang, Zuhua and Zhu, Yingcan and Yang, Tao and Li, Liangfeng and Zhu, Huajun and Wang, Hao (2017) Conversion of local industrial wastes into greener cement through geopolymer technology: a case study of high-magnesium nickel slag. Journal of Cleaner Production, 141. pp. 463-471. ISSN 0959-6526

Abstract

Geopolymer technology has shown the values of converting industrial waste streams into green cements. This ‘low temperature’ manufacturing technology opens a window to make clink-free concrete. This paper reports the case of using fly ash and a local high-magnesium nickel slag (HMNS) as solid materials to manufacture geopolymer cement under the room temperature conditions. The results show that by
using optimal quantities of alkali activator and HMNS, the compressive strengths of resulting geopolymer cements can achieve 60 MPa, which are comparable to hardened Portland cements and adequate for construction purposes. The analysis of carbon emissions and embodied energy indicates that manufacturing 1 t of geopolymer cement paste requires 1.11e1.34 GJ and emits 0.19e0.24 t CO2 at a transportation distance of 50e300 km for solid materials. There is a reduction about 60% in both embodied energy and CO2 emissions compared to manufacturing the same quantity of Portland cement paste. The use of ground HMNS to substitute for fly ash can solve the problem of potential environmental
risk of this industrial waste while only increase the environmental footprint of geopolymer cements
slightly. The proposed model in this study can be an effective and green process for the management and
valuable utilization of local solid industrial wastes with proper compositions and reactivity.


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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: 07 Mar 2017 05:43
Last Modified: 07 Jun 2017 06:20
Uncontrolled Keywords: geopolymer cement, solid waste, fly ash, slag, carbon dioxide, embodied energy
Fields of Research : 09 Engineering > 0905 Civil Engineering > 090503 Construction Materials
09 Engineering > 0912 Materials Engineering > 091202 Composite and Hybrid Materials
Identification Number or DOI: 10.1016/j.jclepro.2016.09.147
URI: http://eprints.usq.edu.au/id/eprint/30826

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