Carbonation-induced volume change in alkali-activated slag

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

In this work, the volume changes of alkali-activated slag (AAS) paste prepared using various types of activator were characterized at nitrogen and atmospheric conditions. The results show that atmospheric carbonation of AAS results in volumetric expansion and disintegration, which may be attributed to the generation of crystallization stress in restrained pore spaces. This study suggests that the carbonation-induced volume change in cementitious materials is a combined result of chemical reactions and physical characteristics, depending on hydrated phase assemblage, composition, and pore structure of cementitious solids. The potassium ions (K+), compared to sodium ions (Na+), can enter the interlayer space of calcium-alumina-silicate-hydrate (C-A-S-H), distort the C-A-S-H layers stacking, coarsen the pore structure, and make AAS more vulnerable to carbonation. It is suggested that the high alkali content in AAS systems contributes considerably to its poor volumetric stability under carbonation.

Original languageEnglish (US)
Pages (from-to)635-644
Number of pages10
JournalConstruction and Building Materials
Volume144
DOIs
StatePublished - Jul 30 2017

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Carbonation
Alkalies
Slags
Pore structure
Disintegration
Silicic Acid
Ions
Hydrates
Phase composition
Aluminum Oxide
Silicates
Potassium
Chemical reactions
Calcium
Ointments
Crystallization
Alumina
Sodium
Nitrogen

All Science Journal Classification (ASJC) codes

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

Cite this

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title = "Carbonation-induced volume change in alkali-activated slag",
abstract = "In this work, the volume changes of alkali-activated slag (AAS) paste prepared using various types of activator were characterized at nitrogen and atmospheric conditions. The results show that atmospheric carbonation of AAS results in volumetric expansion and disintegration, which may be attributed to the generation of crystallization stress in restrained pore spaces. This study suggests that the carbonation-induced volume change in cementitious materials is a combined result of chemical reactions and physical characteristics, depending on hydrated phase assemblage, composition, and pore structure of cementitious solids. The potassium ions (K+), compared to sodium ions (Na+), can enter the interlayer space of calcium-alumina-silicate-hydrate (C-A-S-H), distort the C-A-S-H layers stacking, coarsen the pore structure, and make AAS more vulnerable to carbonation. It is suggested that the high alkali content in AAS systems contributes considerably to its poor volumetric stability under carbonation.",
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Carbonation-induced volume change in alkali-activated slag. / Ye, Hailong; Radlińska, Aleksandra.

In: Construction and Building Materials, Vol. 144, 30.07.2017, p. 635-644.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Carbonation-induced volume change in alkali-activated slag

AU - Ye, Hailong

AU - Radlińska, Aleksandra

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