Potential reduction of concrete deterioration through controlled DEF in hydrated concrete

Research output: Contribution to journalArticle

Abstract

Delayed ettringite formation (DEF) is a chemical reaction with proven damaging effects on hydrated concrete. Ettringite crystals can cause cracks and their widening due to pressure on cracked walls caused by the positive volume difference in the reaction. Concrete may show improvements in strength at early ages but further growth of cracks causes widening and spreading through the concrete structure. In this study, finely dispersed crystallization nuclei achieved by adding air-entraining agent (AEA) and short vibration of specimens is presented as the main prerequisite for reducing DEF-induced deterioration of hydrated concrete. The study presents the method and mechanism for obtaining the required nucleation. Controlling long-term DEF by providing AEA-induced crystallisation nuclei, prevented excessive and rapid initial strength improvements, and resulted in a slight increase of compressive strength of fine grained concrete with only marginally lower density.
Original languageEnglish
Pages (from-to)1307-1318
Number of pages12
JournalInternational Journal of Physical Sciences
Volume8
Issue number24
DOIs
Publication statusPublished - 1 Jun 2013
Externally publishedYes

Fingerprint

deterioration
Deterioration
Concretes
Crystallization
cracks
crystallization
Cracks
concrete structures
nuclei
causes
compressive strength
air
Air
Concrete construction
Compressive strength
Chemical reactions
chemical reactions
Nucleation
nucleation
vibration

Keywords

  • delayed ettringite formation (DEF)
  • aerated concrete
  • strength imrpovement

Cite this

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abstract = "Delayed ettringite formation (DEF) is a chemical reaction with proven damaging effects on hydrated concrete. Ettringite crystals can cause cracks and their widening due to pressure on cracked walls caused by the positive volume difference in the reaction. Concrete may show improvements in strength at early ages but further growth of cracks causes widening and spreading through the concrete structure. In this study, finely dispersed crystallization nuclei achieved by adding air-entraining agent (AEA) and short vibration of specimens is presented as the main prerequisite for reducing DEF-induced deterioration of hydrated concrete. The study presents the method and mechanism for obtaining the required nucleation. Controlling long-term DEF by providing AEA-induced crystallisation nuclei, prevented excessive and rapid initial strength improvements, and resulted in a slight increase of compressive strength of fine grained concrete with only marginally lower density.",
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Potential reduction of concrete deterioration through controlled DEF in hydrated concrete. / Lubej, Samo; Radosavljevic, Milan.

In: International Journal of Physical Sciences, Vol. 8, No. 24, 01.06.2013, p. 1307-1318.

Research output: Contribution to journalArticle

TY - JOUR

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AU - Lubej, Samo

AU - Radosavljevic, Milan

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AB - Delayed ettringite formation (DEF) is a chemical reaction with proven damaging effects on hydrated concrete. Ettringite crystals can cause cracks and their widening due to pressure on cracked walls caused by the positive volume difference in the reaction. Concrete may show improvements in strength at early ages but further growth of cracks causes widening and spreading through the concrete structure. In this study, finely dispersed crystallization nuclei achieved by adding air-entraining agent (AEA) and short vibration of specimens is presented as the main prerequisite for reducing DEF-induced deterioration of hydrated concrete. The study presents the method and mechanism for obtaining the required nucleation. Controlling long-term DEF by providing AEA-induced crystallisation nuclei, prevented excessive and rapid initial strength improvements, and resulted in a slight increase of compressive strength of fine grained concrete with only marginally lower density.

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