Effects of ground granulated blast furnace slag on the mechanical and microstructure of fly ash-based geopolymer binders

Yang, T. and Yao, X. and Zhang, Z. and Wang, H. (2012) Effects of ground granulated blast furnace slag on the mechanical and microstructure of fly ash-based geopolymer binders. In: 8th Asian-Australasian Conference on Composite Materials (ACCM 2012): Composites: Enabling Tomorrow's Industry Today , 6-8 Nov 2012, Kuala Lumpur, Malaysia.

Official URL: http://www.accm8.my/


The effects of addition of ground granulated blast furnace slag on mechanical properties and microstructure of fly ash-based geopolymers were investigated via compressive strength testing, X-ray diffractometry (XRD), Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The compressive strength of geopolymers increased with the slag ratio increasing. The alkaline activation of slag and fly ash forms a kind of homogeneous product with microstructure between typical alkali aluminosilicate gels (N-A-S-H) and calcium silicate hydrates (C-S-H). Distinct phase separation has not been found as the slag ratio varies or the modulus of the alkali activator decreases from 1.2 to 2.0. The FTIR bands assigning to T-O-Si (T=Al or Si) asymmetric stretching vibrations of the geopolymer binders shift towards lower regions as slag is incorporated, and this shift is explained due to the decrease of poly-degree of the aluminosilicate networks. The increased XRD diffraction hump and FTIR bands that assigned to aluminosilicate gels suggests improved quantity of alkaline activation products as the content of slag increases, and this is related to the increased compressive strength.

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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: Yes
Item Status: Live Archive
Additional Information: © 2012 by Asian-Australian Association for Composite Materials (AACM). Permanent restricted access to published version due to publisher copyright policy.
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Mechanical and Mechatronic Engineering
Date Deposited: 17 Feb 2013 05:36
Last Modified: 10 Nov 2014 23:42
Uncontrolled Keywords: geopolymer; fly ash; slag; calcium; alkaline activation
Fields of Research : 09 Engineering > 0905 Civil Engineering > 090503 Construction Materials
09 Engineering > 0912 Materials Engineering > 091201 Ceramics
03 Chemical Sciences > 0306 Physical Chemistry (incl. Structural) > 030604 Electrochemistry
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970109 Expanding Knowledge in Engineering
URI: http://eprints.usq.edu.au/id/eprint/22727

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