Strength prediction and mix design procedures for geopolymer and alkali-activated cement mortars comprising a wide range of environmentaliy responsible binder systems

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Abstract

This research presents a mix design methodology for geopolymer (GP) and alkali activated (AA) mortars based on metakaolin and industrial waste products activated using potassium silicate. The aim is to enable a wide range of mix designs to be specified to given compressive strength, consistency and environmental footprints to facilitate their adoption as a Portland cement (PC) alternatives in the construction industry in applications such as fibre-reinforced building cladding systems. The impact of the work is timely as literature quantifying the effects of mix parameters on broad families of GP and AA materials are limited, and no standardized performance-based methodology exists. Initially, effects of binder composition on mechanical and environmental properties are presented for a standard GP mix design using contoured ternary plots for a range of material blends. Next, effects of altering mixture parameters such as liquid/solid, silica/alumina and activator/binder ratios are quantified for three selected binder compositions before a preliminary mix design methodology is presented allowing initial selection of mixture proportions. Finally, correlation analysis is used to identify multiple mix variables strongly correlating with strength, and regression modeling used to present predictive tools with average errors <6%.

LanguageEnglish
Pages135-143
Number of pages9
JournalJournal of Structural Integrity and Maintenance
Volume4
Issue number3
DOIs
Publication statusPublished - 29 Jul 2019

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Geopolymers
Alkalies
Mortar
Binders
Cements
Industrial Waste
Silicates
Aluminum Oxide
Industrial wastes
Portland cement
Construction industry
Chemical analysis
Silicon Dioxide
Compressive strength
Potassium
Alumina
Silica
Fibers
Liquids

Keywords

  • Geopolymer,
  • alkali activated,
  • metakaolin,
  • industrial wastes,
  • mixture design, performance prediction
  • performance prediction
  • Geopolymer
  • alkali activated
  • metakaolin
  • mixture design
  • industrial wastes

Cite this

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title = "Strength prediction and mix design procedures for geopolymer and alkali-activated cement mortars comprising a wide range of environmentaliy responsible binder systems",
abstract = "This research presents a mix design methodology for geopolymer (GP) and alkali activated (AA) mortars based on metakaolin and industrial waste products activated using potassium silicate. The aim is to enable a wide range of mix designs to be specified to given compressive strength, consistency and environmental footprints to facilitate their adoption as a Portland cement (PC) alternatives in the construction industry in applications such as fibre-reinforced building cladding systems. The impact of the work is timely as literature quantifying the effects of mix parameters on broad families of GP and AA materials are limited, and no standardized performance-based methodology exists. Initially, effects of binder composition on mechanical and environmental properties are presented for a standard GP mix design using contoured ternary plots for a range of material blends. Next, effects of altering mixture parameters such as liquid/solid, silica/alumina and activator/binder ratios are quantified for three selected binder compositions before a preliminary mix design methodology is presented allowing initial selection of mixture proportions. Finally, correlation analysis is used to identify multiple mix variables strongly correlating with strength, and regression modeling used to present predictive tools with average errors <6{\%}.",
keywords = "Geopolymer,, alkali activated,, metakaolin,, industrial wastes,, mixture design, performance prediction, performance prediction, Geopolymer, alkali activated, metakaolin, mixture design, industrial wastes",
author = "Luke Oakes and Bryan Magee and AT McIlhagger and M McCartney",
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AB - This research presents a mix design methodology for geopolymer (GP) and alkali activated (AA) mortars based on metakaolin and industrial waste products activated using potassium silicate. The aim is to enable a wide range of mix designs to be specified to given compressive strength, consistency and environmental footprints to facilitate their adoption as a Portland cement (PC) alternatives in the construction industry in applications such as fibre-reinforced building cladding systems. The impact of the work is timely as literature quantifying the effects of mix parameters on broad families of GP and AA materials are limited, and no standardized performance-based methodology exists. Initially, effects of binder composition on mechanical and environmental properties are presented for a standard GP mix design using contoured ternary plots for a range of material blends. Next, effects of altering mixture parameters such as liquid/solid, silica/alumina and activator/binder ratios are quantified for three selected binder compositions before a preliminary mix design methodology is presented allowing initial selection of mixture proportions. Finally, correlation analysis is used to identify multiple mix variables strongly correlating with strength, and regression modeling used to present predictive tools with average errors <6%.

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