A simplified mix design procedure for geopolymer cement mortars based on metakaolin and industrial waste products activated with potassium silicate

Research output: Contribution to conferencePaper

Abstract

This paper presents a mix design methodology for geopolymer mortars based on metakaolin and industrial waste products activated using potassium silicate. The work is aimed at enabling performance-based specification and compressive strength prediction to drive forward their adoption as an alternative to Portland cement-based mortars used in fibre reinforced cladding systems. Few studies currently quantify the effects of mix parameters on broad families of geopolymer materials and no standard mix design methodology exists. Resultant mortars must have high strength to create light, thin panels, have high flow to enable effective dispersal of reinforcement fibres and as low an environmental impact as possible to maximise the impact of replacement. For a standard geopolymer mix, the effect of binder composition on mechanical performance and environmental impact is initially studied using ternary contour maps for a range of material blends. Next, the effects of altering mixture parameters such as the liquid/solid, silica/alumina and activator/binder ratios are quantified for three binder compositions identified as having high performance. Finally, correlation analysis is used to identify mix variables strongly correlating with compressive strength and regression analysis of the most deterministic to create a prediction models. Geopolymer mortars have been developed with compressive strengths over 80 and 100 N/mm2 at 7 and 28 days respectively and the methodology presented allows design of such mortars by non-experts. Model predictions of compressive strength is shown to be relatively accurate, with average errors across binder compositions ranging from 2.3-5.8%. Further research expanding the range of materials and mix compositions is ongoing to advance this innovative methodology further.
LanguageEnglish
Number of pages6
Publication statusPublished - 28 Aug 2018
EventCivil Engineering Research in Ireland - QUB Belfast
Duration: 29 Aug 2014 → …

Conference

ConferenceCivil Engineering Research in Ireland
Period29/08/14 → …

Fingerprint

Geopolymers
Industrial wastes
Mortar
Silicates
Potassium
Cements
Compressive strength
Binders
Chemical analysis
Environmental impact
Portland cement
Fiber reinforced materials
Regression analysis
Alumina
Silica
Specifications
Fibers
Liquids

Keywords

  • Geopolymer
  • Mortar
  • Metakaolin
  • Industrial waste
  • Potassium silicate
  • liquid to solid ratio
  • Mis Design
  • Compressive strength
  • prediction

Cite this

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title = "A simplified mix design procedure for geopolymer cement mortars based on metakaolin and industrial waste products activated with potassium silicate",
abstract = "This paper presents a mix design methodology for geopolymer mortars based on metakaolin and industrial waste products activated using potassium silicate. The work is aimed at enabling performance-based specification and compressive strength prediction to drive forward their adoption as an alternative to Portland cement-based mortars used in fibre reinforced cladding systems. Few studies currently quantify the effects of mix parameters on broad families of geopolymer materials and no standard mix design methodology exists. Resultant mortars must have high strength to create light, thin panels, have high flow to enable effective dispersal of reinforcement fibres and as low an environmental impact as possible to maximise the impact of replacement. For a standard geopolymer mix, the effect of binder composition on mechanical performance and environmental impact is initially studied using ternary contour maps for a range of material blends. Next, the effects of altering mixture parameters such as the liquid/solid, silica/alumina and activator/binder ratios are quantified for three binder compositions identified as having high performance. Finally, correlation analysis is used to identify mix variables strongly correlating with compressive strength and regression analysis of the most deterministic to create a prediction models. Geopolymer mortars have been developed with compressive strengths over 80 and 100 N/mm2 at 7 and 28 days respectively and the methodology presented allows design of such mortars by non-experts. Model predictions of compressive strength is shown to be relatively accurate, with average errors across binder compositions ranging from 2.3-5.8{\%}. Further research expanding the range of materials and mix compositions is ongoing to advance this innovative methodology further.",
keywords = "Geopolymer, Mortar, Metakaolin, Industrial waste, Potassium silicate, liquid to solid ratio, Mis Design, Compressive strength , prediction",
author = "Luke Oakes and Bryan Magee and Phillip Millar and AT McIlhagger and M McCartney",
year = "2018",
month = "8",
day = "28",
language = "English",
note = "Civil Engineering Research in Ireland ; Conference date: 29-08-2014",

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T1 - A simplified mix design procedure for geopolymer cement mortars based on metakaolin and industrial waste products activated with potassium silicate

AU - Oakes, Luke

AU - Magee, Bryan

AU - Millar, Phillip

AU - McIlhagger, AT

AU - McCartney, M

PY - 2018/8/28

Y1 - 2018/8/28

N2 - This paper presents a mix design methodology for geopolymer mortars based on metakaolin and industrial waste products activated using potassium silicate. The work is aimed at enabling performance-based specification and compressive strength prediction to drive forward their adoption as an alternative to Portland cement-based mortars used in fibre reinforced cladding systems. Few studies currently quantify the effects of mix parameters on broad families of geopolymer materials and no standard mix design methodology exists. Resultant mortars must have high strength to create light, thin panels, have high flow to enable effective dispersal of reinforcement fibres and as low an environmental impact as possible to maximise the impact of replacement. For a standard geopolymer mix, the effect of binder composition on mechanical performance and environmental impact is initially studied using ternary contour maps for a range of material blends. Next, the effects of altering mixture parameters such as the liquid/solid, silica/alumina and activator/binder ratios are quantified for three binder compositions identified as having high performance. Finally, correlation analysis is used to identify mix variables strongly correlating with compressive strength and regression analysis of the most deterministic to create a prediction models. Geopolymer mortars have been developed with compressive strengths over 80 and 100 N/mm2 at 7 and 28 days respectively and the methodology presented allows design of such mortars by non-experts. Model predictions of compressive strength is shown to be relatively accurate, with average errors across binder compositions ranging from 2.3-5.8%. Further research expanding the range of materials and mix compositions is ongoing to advance this innovative methodology further.

AB - This paper presents a mix design methodology for geopolymer mortars based on metakaolin and industrial waste products activated using potassium silicate. The work is aimed at enabling performance-based specification and compressive strength prediction to drive forward their adoption as an alternative to Portland cement-based mortars used in fibre reinforced cladding systems. Few studies currently quantify the effects of mix parameters on broad families of geopolymer materials and no standard mix design methodology exists. Resultant mortars must have high strength to create light, thin panels, have high flow to enable effective dispersal of reinforcement fibres and as low an environmental impact as possible to maximise the impact of replacement. For a standard geopolymer mix, the effect of binder composition on mechanical performance and environmental impact is initially studied using ternary contour maps for a range of material blends. Next, the effects of altering mixture parameters such as the liquid/solid, silica/alumina and activator/binder ratios are quantified for three binder compositions identified as having high performance. Finally, correlation analysis is used to identify mix variables strongly correlating with compressive strength and regression analysis of the most deterministic to create a prediction models. Geopolymer mortars have been developed with compressive strengths over 80 and 100 N/mm2 at 7 and 28 days respectively and the methodology presented allows design of such mortars by non-experts. Model predictions of compressive strength is shown to be relatively accurate, with average errors across binder compositions ranging from 2.3-5.8%. Further research expanding the range of materials and mix compositions is ongoing to advance this innovative methodology further.

KW - Geopolymer

KW - Mortar

KW - Metakaolin

KW - Industrial waste

KW - Potassium silicate

KW - liquid to solid ratio

KW - Mis Design

KW - Compressive strength

KW - prediction

M3 - Paper

ER -