Ambient cured fly ash geopolymer coatings for concrete

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The reinforced concrete structures that support transport, energy and urban networks in developed countries are over half a century old, and are facing widespread deterioration. Geopolymers are an affordable class of materials that have promising applications in concrete structure coating, rehabilitation and sensing, due to their high chloride, sulphate, fire and freeze-thaw resistances and electrolytic conductivity. Work to date has, however, mainly focused on geopolymers that require curing at elevated temperatures, and this limits their ease of use in the field, particularly in cooler climates. Here, we outline a design process for fabricating ambient-cured fly ash geopolymer coatings for concrete substrates. Our technique is distinct from previous work as it requires no additional manufacturing steps or additives, both of which can bear significant costs. Our coatings were tested at varying humidities, and the impacts of mixing and application methods on coating integrity were compared using a combination of calorimetry, x-ray diffraction and image-processing techniques. This work could allow geopolymer coatings to become a more ubiquitous technique for updating ageing concrete infrastructure so that it can meet modern expectations of safety, and shifting requirements due to climate change.

LanguageEnglish
Article number923
Number of pages24
JournalMaterials
Volume16
Issue number6
DOIs
Publication statusPublished - 20 Mar 2019

Fingerprint

Coal Ash
Geopolymers
Fly ash
Concretes
Coatings
Concrete construction
Calorimetry
Climate change
Patient rehabilitation
Sulfates
Deterioration
Reinforced concrete
Curing
Chlorides
Atmospheric humidity
Fires
Image processing
Aging of materials
Diffraction
X rays

Keywords

  • concrete repair
  • geopolymers
  • alkali-activated materials
  • coating thickness
  • ambient curing
  • shrinkage
  • efflorescence
  • cracking
  • water transport

Cite this

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title = "Ambient cured fly ash geopolymer coatings for concrete",
abstract = "The reinforced concrete structures that support transport, energy and urban networks in developed countries are over half a century old, and are facing widespread deterioration. Geopolymers are an affordable class of materials that have promising applications in concrete structure coating, rehabilitation and sensing, due to their high chloride, sulphate, fire and freeze-thaw resistances and electrolytic conductivity. Work to date has, however, mainly focused on geopolymers that require curing at elevated temperatures, and this limits their ease of use in the field, particularly in cooler climates. Here, we outline a design process for fabricating ambient-cured fly ash geopolymer coatings for concrete substrates. Our technique is distinct from previous work as it requires no additional manufacturing steps or additives, both of which can bear significant costs. Our coatings were tested at varying humidities, and the impacts of mixing and application methods on coating integrity were compared using a combination of calorimetry, x-ray diffraction and image-processing techniques. This work could allow geopolymer coatings to become a more ubiquitous technique for updating ageing concrete infrastructure so that it can meet modern expectations of safety, and shifting requirements due to climate change.",
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Ambient cured fly ash geopolymer coatings for concrete. / Biondi, L.; Perry, M.; Vlachakis, C.; Wu, Z.; Hamilton, A.; McAlorum, J.

In: Materials, Vol. 16, No. 6, 923, 20.03.2019.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Ambient cured fly ash geopolymer coatings for concrete

AU - Biondi, L.

AU - Perry, M.

AU - Vlachakis, C.

AU - Wu, Z.

AU - Hamilton, A.

AU - McAlorum, J.

PY - 2019/3/20

Y1 - 2019/3/20

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AB - The reinforced concrete structures that support transport, energy and urban networks in developed countries are over half a century old, and are facing widespread deterioration. Geopolymers are an affordable class of materials that have promising applications in concrete structure coating, rehabilitation and sensing, due to their high chloride, sulphate, fire and freeze-thaw resistances and electrolytic conductivity. Work to date has, however, mainly focused on geopolymers that require curing at elevated temperatures, and this limits their ease of use in the field, particularly in cooler climates. Here, we outline a design process for fabricating ambient-cured fly ash geopolymer coatings for concrete substrates. Our technique is distinct from previous work as it requires no additional manufacturing steps or additives, both of which can bear significant costs. Our coatings were tested at varying humidities, and the impacts of mixing and application methods on coating integrity were compared using a combination of calorimetry, x-ray diffraction and image-processing techniques. This work could allow geopolymer coatings to become a more ubiquitous technique for updating ageing concrete infrastructure so that it can meet modern expectations of safety, and shifting requirements due to climate change.

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KW - efflorescence

KW - cracking

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