Influence of cement type on resistance to attack from two carboxylic acids

Thomas Dyer (Lead / Corresponding author)

Research output: Contribution to journalArticle

2 Citations (Scopus)
99 Downloads (Pure)

Abstract

In a number of circumstances, concrete may be required to possess resistance to organic acids. These are frequently carboxylic acids. This paper examines the effect of two such acids – acetic and butyric – on hardened cement paste specimens made from three cement types – Portland cement (PC), a combination of PC and fly ash (PC/FA), and a calcium sulfoaluminate cement (CSA). Specimens were exposed to solutions of the acids and deterioration characterized in terms of mass loss and pH measurements, micro-CT scanning, and chemical and mineralogical analysis. Additionally geochemical modelling was used to further examine the mechanisms involved during acid attack. The CSA cement was most resistant to attack, with the PC paste displaying the least resistance. This resistance has been partly attributed to the higher acid neutralization capacity of CSA cement. However, this paper demonstrates that the enhanced performance is most probably the result of a denser microstructure.

Original languageEnglish
Pages (from-to)20-35
Number of pages16
JournalCement and Concrete Composites
Volume83
Early online date6 Jul 2017
DOIs
Publication statusPublished - Oct 2017

Fingerprint

Carboxylic Acids
Carboxylic acids
Cements
Portland cement
Calcium
Ointments
Acids
Coal Ash
Butyric acid
Butyrates
Organic acids
Fly ash
Acetic acid
Deterioration
Acetates
Concretes
Scanning
Microstructure
calcium sulfoaluminate

Keywords

  • Acid attack
  • Portland cement
  • Fly ash
  • Calcium sulfoaluminate cement
  • Acetic
  • Butyric

Cite this

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title = "Influence of cement type on resistance to attack from two carboxylic acids",
abstract = "In a number of circumstances, concrete may be required to possess resistance to organic acids. These are frequently carboxylic acids. This paper examines the effect of two such acids – acetic and butyric – on hardened cement paste specimens made from three cement types – Portland cement (PC), a combination of PC and fly ash (PC/FA), and a calcium sulfoaluminate cement (CSA). Specimens were exposed to solutions of the acids and deterioration characterized in terms of mass loss and pH measurements, micro-CT scanning, and chemical and mineralogical analysis. Additionally geochemical modelling was used to further examine the mechanisms involved during acid attack. The CSA cement was most resistant to attack, with the PC paste displaying the least resistance. This resistance has been partly attributed to the higher acid neutralization capacity of CSA cement. However, this paper demonstrates that the enhanced performance is most probably the result of a denser microstructure.",
keywords = "Acid attack, Portland cement, Fly ash, Calcium sulfoaluminate cement, Acetic, Butyric",
author = "Thomas Dyer",
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N2 - In a number of circumstances, concrete may be required to possess resistance to organic acids. These are frequently carboxylic acids. This paper examines the effect of two such acids – acetic and butyric – on hardened cement paste specimens made from three cement types – Portland cement (PC), a combination of PC and fly ash (PC/FA), and a calcium sulfoaluminate cement (CSA). Specimens were exposed to solutions of the acids and deterioration characterized in terms of mass loss and pH measurements, micro-CT scanning, and chemical and mineralogical analysis. Additionally geochemical modelling was used to further examine the mechanisms involved during acid attack. The CSA cement was most resistant to attack, with the PC paste displaying the least resistance. This resistance has been partly attributed to the higher acid neutralization capacity of CSA cement. However, this paper demonstrates that the enhanced performance is most probably the result of a denser microstructure.

AB - In a number of circumstances, concrete may be required to possess resistance to organic acids. These are frequently carboxylic acids. This paper examines the effect of two such acids – acetic and butyric – on hardened cement paste specimens made from three cement types – Portland cement (PC), a combination of PC and fly ash (PC/FA), and a calcium sulfoaluminate cement (CSA). Specimens were exposed to solutions of the acids and deterioration characterized in terms of mass loss and pH measurements, micro-CT scanning, and chemical and mineralogical analysis. Additionally geochemical modelling was used to further examine the mechanisms involved during acid attack. The CSA cement was most resistant to attack, with the PC paste displaying the least resistance. This resistance has been partly attributed to the higher acid neutralization capacity of CSA cement. However, this paper demonstrates that the enhanced performance is most probably the result of a denser microstructure.

KW - Acid attack

KW - Portland cement

KW - Fly ash

KW - Calcium sulfoaluminate cement

KW - Acetic

KW - Butyric

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DO - 10.1016/j.cemconcomp.2017.07.004

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JF - Cement and Concrete Composites

SN - 0958-9465

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