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Development of geopolymer mortar under ambient temperature for in situ applications

Development of geopolymer mortar under ambient temperature for in situ applications
Development of geopolymer mortar under ambient temperature for in situ applications
Geopolymer concrete technology involves production of more environmentally friendly waste material-based concrete which could be a viable solution for conventional concrete replacement. Typical fly ash-based geopolymer concrete however requires high temperature curing treatment in order to develop sufficient early strength properties, which is considered a severe limitation for cast-in-place concrete applications. Most previous studies on geopolymer concrete have focused on the properties of concretes pre-hardened by heat curing and/or by aggressive chemical treatment (e.g. alkali activation using concentrated sodium hydroxide (NaOH)). The current study presents an extensive experimental investigation on the mechanical and microstructural properties of geopolymer concrete mixes prepared with a combination of fly ash and slag cured under ambient temperature. ‘User friendly’ geopolymer mixes were produced using fly ash (FA) and Ground Granulated Blast furnace Slag (GGBS) mixed together with potassium silicate with molar ratio equal to 1.2 (as the activator) and water. The results indicated that heat curing treatment can be avoided by partial replacement of fly ash with slag. The compressive strength of the examined mixes was found to be in the range of 40–50 MPa for 40% and 50% GGBS replacement mixtures respectively. Moreover, the flexural and direct tensile strengths of geopolymer mixes are considerably improved as the GGBS content is increased. Based on FTIR and SEM/EDS analysis, the inclusion of a higher content of GGBS resulted in a denser structure by formation of more hydration products.
Fly ash, Slag, Ambient temperature, User friendly geopolymer mortar
0950-0618
198-211
Al-Majidi, Mohammed Haloob
2bf1e66a-804e-4a56-86cf-a9616f61f960
Lampropoulos, Andreas
cb4d2db2-76cb-4bef-be28-2fa4d0902de2
Cundy, Andrew
994fdc96-2dce-40f4-b74b-dc638286eb08
Meikle, Steve
a6e64a37-3665-4a33-af28-6f77388d8e51
Al-Majidi, Mohammed Haloob
2bf1e66a-804e-4a56-86cf-a9616f61f960
Lampropoulos, Andreas
cb4d2db2-76cb-4bef-be28-2fa4d0902de2
Cundy, Andrew
994fdc96-2dce-40f4-b74b-dc638286eb08
Meikle, Steve
a6e64a37-3665-4a33-af28-6f77388d8e51

Al-Majidi, Mohammed Haloob, Lampropoulos, Andreas, Cundy, Andrew and Meikle, Steve (2016) Development of geopolymer mortar under ambient temperature for in situ applications. Construction and Building Materials, 120, 198-211. (doi:10.1016/j.conbuildmat.2016.05.085).

Record type: Article

Abstract

Geopolymer concrete technology involves production of more environmentally friendly waste material-based concrete which could be a viable solution for conventional concrete replacement. Typical fly ash-based geopolymer concrete however requires high temperature curing treatment in order to develop sufficient early strength properties, which is considered a severe limitation for cast-in-place concrete applications. Most previous studies on geopolymer concrete have focused on the properties of concretes pre-hardened by heat curing and/or by aggressive chemical treatment (e.g. alkali activation using concentrated sodium hydroxide (NaOH)). The current study presents an extensive experimental investigation on the mechanical and microstructural properties of geopolymer concrete mixes prepared with a combination of fly ash and slag cured under ambient temperature. ‘User friendly’ geopolymer mixes were produced using fly ash (FA) and Ground Granulated Blast furnace Slag (GGBS) mixed together with potassium silicate with molar ratio equal to 1.2 (as the activator) and water. The results indicated that heat curing treatment can be avoided by partial replacement of fly ash with slag. The compressive strength of the examined mixes was found to be in the range of 40–50 MPa for 40% and 50% GGBS replacement mixtures respectively. Moreover, the flexural and direct tensile strengths of geopolymer mixes are considerably improved as the GGBS content is increased. Based on FTIR and SEM/EDS analysis, the inclusion of a higher content of GGBS resulted in a denser structure by formation of more hydration products.

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AlMajidi et al 2016.pdf - Accepted Manuscript
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More information

Accepted/In Press date: 11 May 2016
Published date: 1 September 2016
Keywords: Fly ash, Slag, Ambient temperature, User friendly geopolymer mortar
Organisations: Geochemistry

Identifiers

Local EPrints ID: 399256
URI: https://eprints.soton.ac.uk/id/eprint/399256
ISSN: 0950-0618
PURE UUID: 547e366d-4b94-43c8-9778-71ea3b801edb
ORCID for Andrew Cundy: ORCID iD orcid.org/0000-0003-4368-2569

Catalogue record

Date deposited: 09 Aug 2016 16:01
Last modified: 03 Dec 2019 06:36

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