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Title: Utilisation of steel furnace slag coarse aggregate in a low calcium fly ash geopolymer concrete

Abstract

This paper evaluates the performance of steel furnace slag (SFS) coarse aggregate in blended slag and low calcium fly ash geopolymer concrete (GPC). The geopolymer binder is composed of 90% of low calcium fly ash and 10% of ground granulated blast furnace slag (GGBFS). Mechanical and physical properties, shrinkage, and detailed microstructure analysis were carried out. The results showed that geopolymer concrete with SFS aggregate offered higher compressive strength, surface resistivity and pulse velocity than that of GPC with traditional aggregate. The shrinkage results showed no expansion or swelling due to delayed calcium oxide (CaO) hydration after 320 days. No traditional porous interfacial transition zone (ITZ) was detected using scanning electron microscopy, indicating a better bond between SFS aggregate and geopolymer matrix. Energy dispersive spectroscopy results further revealed calcium (Ca) diffusion at the vicinity of ITZ. Raman spectroscopy results showed no new crystalline phase formed due to Ca diffusion. X-ray fluorescence result showed Mg diffusion from SFS aggregate towards geopolymer matrix. The incorporation of Ca and Mg into the geopolymer structure and better bond between SFS aggregate and geopolymer matrix are the most likely reasons for the higher compressive strength observed in GPC with SFS aggregate.

Authors:
 [1]; ; ;  [1];  [2]
  1. Centre for Infrastructure Engineering and Safety, School of Civil and Environmental Engineering, The University of New South Wales, Sydney, NSW 2052 (Australia)
  2. Australian Steel Mill Services, Springhill Road, Port Kembla, NSW (Australia)
Publication Date:
OSTI Identifier:
22697082
Resource Type:
Journal Article
Journal Name:
Cement and Concrete Research
Additional Journal Information:
Journal Volume: 89; Other Information: Copyright (c) 2016 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0008-8846
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BLAST FURNACES; CALCIUM OXIDES; COMPRESSION STRENGTH; CONCRETES; ELECTRON SCANNING; FLY ASH; HYDRATION; MATRICES; PHYSICAL PROPERTIES; POROUS MATERIALS; RAMAN SPECTROSCOPY; SCANNING ELECTRON MICROSCOPY; SLAGS; STEELS; SWELLING; X RADIATION

Citation Formats

Khan, M. S.H.,, Castel, Arnaud, Akbarnezhad, A., Foster, Stephen J., and Smith, Marc. Utilisation of steel furnace slag coarse aggregate in a low calcium fly ash geopolymer concrete. United States: N. p., 2016. Web. doi:10.1016/J.CEMCONRES.2016.09.001.
Khan, M. S.H.,, Castel, Arnaud, Akbarnezhad, A., Foster, Stephen J., & Smith, Marc. Utilisation of steel furnace slag coarse aggregate in a low calcium fly ash geopolymer concrete. United States. https://doi.org/10.1016/J.CEMCONRES.2016.09.001
Khan, M. S.H.,, Castel, Arnaud, Akbarnezhad, A., Foster, Stephen J., and Smith, Marc. 2016. "Utilisation of steel furnace slag coarse aggregate in a low calcium fly ash geopolymer concrete". United States. https://doi.org/10.1016/J.CEMCONRES.2016.09.001.
@article{osti_22697082,
title = {Utilisation of steel furnace slag coarse aggregate in a low calcium fly ash geopolymer concrete},
author = {Khan, M. S.H., and Castel, Arnaud and Akbarnezhad, A. and Foster, Stephen J. and Smith, Marc},
abstractNote = {This paper evaluates the performance of steel furnace slag (SFS) coarse aggregate in blended slag and low calcium fly ash geopolymer concrete (GPC). The geopolymer binder is composed of 90% of low calcium fly ash and 10% of ground granulated blast furnace slag (GGBFS). Mechanical and physical properties, shrinkage, and detailed microstructure analysis were carried out. The results showed that geopolymer concrete with SFS aggregate offered higher compressive strength, surface resistivity and pulse velocity than that of GPC with traditional aggregate. The shrinkage results showed no expansion or swelling due to delayed calcium oxide (CaO) hydration after 320 days. No traditional porous interfacial transition zone (ITZ) was detected using scanning electron microscopy, indicating a better bond between SFS aggregate and geopolymer matrix. Energy dispersive spectroscopy results further revealed calcium (Ca) diffusion at the vicinity of ITZ. Raman spectroscopy results showed no new crystalline phase formed due to Ca diffusion. X-ray fluorescence result showed Mg diffusion from SFS aggregate towards geopolymer matrix. The incorporation of Ca and Mg into the geopolymer structure and better bond between SFS aggregate and geopolymer matrix are the most likely reasons for the higher compressive strength observed in GPC with SFS aggregate.},
doi = {10.1016/J.CEMCONRES.2016.09.001},
url = {https://www.osti.gov/biblio/22697082}, journal = {Cement and Concrete Research},
issn = {0008-8846},
number = ,
volume = 89,
place = {United States},
year = {Tue Nov 15 00:00:00 EST 2016},
month = {Tue Nov 15 00:00:00 EST 2016}
}