Effects of modulus of sodium silicate solution on mechanical properties and microstructure of geopolymer

Zhang, Zuhua and Yao, Xiao and Zhu, Huajun (2011) Effects of modulus of sodium silicate solution on mechanical properties and microstructure of geopolymer. Journal of Nanjing University of Technology, 2011 (01). pp. 52-56. ISSN 1671-7627

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Four sodium silicate solutions of modulus m = 1.0, 1.2, 1.4 and 1.6 were prepared as activators used in metakaolin-based geopolymer synthesis. The effects of modulus of activator on the mechanical properties and microstructure of the geopolymers were studied by strength test, infrared analysis (IR), X-ray diffraction (XRD), and scanning electron microscopy (SEM). Results showed that the most SiO 4 tetrahedrals were in low poly-degree status when the modulus varied from 1.0 to 1.6. Compressive strength and flexural strength increased with the curing time. The geopolymer of m = 1.2 achieved the highest compressive strength at 28d (74.6MPa) and its flexural strength was 11.2 MPa. The mineral composition of 4 geopolymers was similarly amorphous, and composed of geopolymeric gels and residual raw particles, while the microstructure of the geopolymer of m = 1.2 was the smoothest one.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: This publication is copyright. It may be reproduced in whole or in part for the purposes of study, research, or review, but is subject to the inclusion of an acknowledgment of the source.
Faculty/School / Institute/Centre: Historic - Faculty of Engineering and Surveying - No Department
Date Deposited: 31 Jul 2014 01:42
Last Modified: 30 Jan 2017 23:23
Uncontrolled Keywords: geopolymer; sodium silicate; modulus; mechanical properties; microstructure
Fields of Research : 09 Engineering > 0905 Civil Engineering > 090503 Construction Materials
09 Engineering > 0912 Materials Engineering > 091209 Polymers and Plastics
09 Engineering > 0913 Mechanical Engineering > 091307 Numerical Modelling and Mechanical Characterisation
Socio-Economic Objective: B Economic Development > 87 Construction > 8703 Construction Materials Performance and Processes > 870303 Polymeric Materials (e.g. Paints)
Identification Number or DOI: doi:10.3969 / j.issn.1671-7627.2011.01.011
URI: http://eprints.usq.edu.au/id/eprint/25662

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