Influence of alkali activator type and proportion on strength performance of calcined clay geopolymer mortar

Aminu Bature Shinkafi; Morteza Khorami; Esmaiel Ganjian; Mark Tyrer

doi:10.1016/j.conbuildmat.2020.120446

Influence of alkali activator type and proportion on strength performance of calcined clay geopolymer mortar

Aminu Bature Shinkafi, Morteza Khorami, Esmaiel Ganjian, Mark Tyrer

School of Energy, Construction and Environment

Research output: Contribution to journal › Article › peer-review

31 Citations (Scopus)

356 Downloads (Pure)

Abstract

The global abundance of low purity kaolin clay and the low embodied energy associated with its calcination makes it a promising aluminosilicate source that will extend the application of geopolymers. In this paper, the compressive strength and microstructure of iron rich, calcined clay based geopolymer mortars activated by two forms of sodium silicate (Na2SiO3) and sodium hydroxide (NaOH) solutions were studied and reported. The samples were cured either in the air or under sealed conditions. The result shows that the 28 days strength of the mortars achieved by reacting the calcined clay with hydrous sodium silicate powder, dissolved under normal atmospheric conditions and sodium silicate solution produced in a pressure reactor vessel are 0.5 MPa and 28.8 MPa respectively. The former produced a non-geopolymer mortar that has a discrete undensified and uncompacted structure with heavy presence of residual particles, thus, achieving a strength that is 1.7% of the latter. The functional group analysis reveals that the binding phase of the peak strength mortar is ferro sialate (Fe-Si-O-Al).

Original language	English
Article number	120446
Number of pages	10
Journal	Construction and Building Materials
Volume	267
Early online date	18 Nov 2020
DOIs	https://doi.org/10.1016/j.conbuildmat.2020.120446
Publication status	Published - 18 Jan 2021

Bibliographical note

NOTICE: this is the author’s version of a work that was accepted for publication in Construction and Building Materials. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Construction and Building Materials, 267, (2021) DOI: 10.1016/j.conbuildmat.2020.120446

© 2020, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/

Keywords

Calcined clay
sodium silicate
sodium hydroxide
geopolymer
mortar
compressive strength
microstructure

ASJC Scopus subject areas

Materials Science(all)
Building and Construction
Civil and Structural Engineering

Access to Document

10.1016/j.conbuildmat.2020.120446

Post-PrintAccepted author manuscript, 1.63 MBLicence: CC BY-NC-ND

Cite this

@article{c700476ed03b466eae991f41d5aae6d5,

title = "Influence of alkali activator type and proportion on strength performance of calcined clay geopolymer mortar",

abstract = "The global abundance of low purity kaolin clay and the low embodied energy associated with its calcination makes it a promising aluminosilicate source that will extend the application of geopolymers. In this paper, the compressive strength and microstructure of iron rich, calcined clay based geopolymer mortars activated by two forms of sodium silicate (Na2SiO3) and sodium hydroxide (NaOH) solutions were studied and reported. The samples were cured either in the air or under sealed conditions. The result shows that the 28 days strength of the mortars achieved by reacting the calcined clay with hydrous sodium silicate powder, dissolved under normal atmospheric conditions and sodium silicate solution produced in a pressure reactor vessel are 0.5 MPa and 28.8 MPa respectively. The former produced a non-geopolymer mortar that has a discrete undensified and uncompacted structure with heavy presence of residual particles, thus, achieving a strength that is 1.7% of the latter. The functional group analysis reveals that the binding phase of the peak strength mortar is ferro sialate (Fe-Si-O-Al). ",

keywords = "Calcined clay, sodium silicate, sodium hydroxide, geopolymer, mortar, compressive strength, microstructure",

author = "Shinkafi, {Aminu Bature} and Morteza Khorami and Esmaiel Ganjian and Mark Tyrer",

note = "NOTICE: this is the author{\textquoteright}s version of a work that was accepted for publication in Construction and Building Materials. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Construction and Building Materials, 267, (2021) DOI: 10.1016/j.conbuildmat.2020.120446 {\textcopyright} 2020, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ ",

year = "2021",

month = jan,

day = "18",

doi = "10.1016/j.conbuildmat.2020.120446",

language = "English",

volume = "267",

journal = "Construction and Building Materials",

issn = "0950-0618",

publisher = "Elsevier",

}

TY - JOUR

T1 - Influence of alkali activator type and proportion on strength performance of calcined clay geopolymer mortar

AU - Shinkafi, Aminu Bature

AU - Khorami, Morteza

AU - Ganjian, Esmaiel

AU - Tyrer, Mark

N1 - NOTICE: this is the author’s version of a work that was accepted for publication in Construction and Building Materials. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Construction and Building Materials, 267, (2021) DOI: 10.1016/j.conbuildmat.2020.120446 © 2020, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/

PY - 2021/1/18

Y1 - 2021/1/18

N2 - The global abundance of low purity kaolin clay and the low embodied energy associated with its calcination makes it a promising aluminosilicate source that will extend the application of geopolymers. In this paper, the compressive strength and microstructure of iron rich, calcined clay based geopolymer mortars activated by two forms of sodium silicate (Na2SiO3) and sodium hydroxide (NaOH) solutions were studied and reported. The samples were cured either in the air or under sealed conditions. The result shows that the 28 days strength of the mortars achieved by reacting the calcined clay with hydrous sodium silicate powder, dissolved under normal atmospheric conditions and sodium silicate solution produced in a pressure reactor vessel are 0.5 MPa and 28.8 MPa respectively. The former produced a non-geopolymer mortar that has a discrete undensified and uncompacted structure with heavy presence of residual particles, thus, achieving a strength that is 1.7% of the latter. The functional group analysis reveals that the binding phase of the peak strength mortar is ferro sialate (Fe-Si-O-Al).

AB - The global abundance of low purity kaolin clay and the low embodied energy associated with its calcination makes it a promising aluminosilicate source that will extend the application of geopolymers. In this paper, the compressive strength and microstructure of iron rich, calcined clay based geopolymer mortars activated by two forms of sodium silicate (Na2SiO3) and sodium hydroxide (NaOH) solutions were studied and reported. The samples were cured either in the air or under sealed conditions. The result shows that the 28 days strength of the mortars achieved by reacting the calcined clay with hydrous sodium silicate powder, dissolved under normal atmospheric conditions and sodium silicate solution produced in a pressure reactor vessel are 0.5 MPa and 28.8 MPa respectively. The former produced a non-geopolymer mortar that has a discrete undensified and uncompacted structure with heavy presence of residual particles, thus, achieving a strength that is 1.7% of the latter. The functional group analysis reveals that the binding phase of the peak strength mortar is ferro sialate (Fe-Si-O-Al).

KW - Calcined clay

KW - sodium silicate

KW - sodium hydroxide

KW - geopolymer

KW - mortar

KW - compressive strength

KW - microstructure

UR - http://www.scopus.com/inward/record.url?scp=85096383371&partnerID=8YFLogxK

U2 - 10.1016/j.conbuildmat.2020.120446

DO - 10.1016/j.conbuildmat.2020.120446

M3 - Article

SN - 0950-0618

VL - 267

JO - Construction and Building Materials

JF - Construction and Building Materials

M1 - 120446

ER -

Influence of alkali activator type and proportion on strength performance of calcined clay geopolymer mortar

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this