Behavior of mortars with different types of cement when induced to Delayed Ettringite Formation (DEF)

  • Friancieli Tiecher Escola Politécnica, Mestrado em Engenharia Civil, IMED, Passo Fundo, Brazil
  • Marinês Langoski Engenharia Civil, IMED, Passo Fundo, Brazil
  • Nicole Hasparyk Departamento de Durabilidade, Eletrobrás Furnas S.A., Aparecida de Goiânia, Brazil
DOI: https://doi.org/10.21041/ra.v11i3.537
Keywords: ettringite, DEF, expansions, mechanical properties, mortar, microstructure

Abstract

The purpose of this paper is to present an evaluation of different types of cement and the incidence of Delayed Ettringite Formation (DEF) through mortar composites cast in the laboratory and exposed to a high curing temperature over a 12-month study period. DEF represents one of the types of Internal Sulfate Attacks (ISA) related to an expansive chemical reaction that occurs inside of concrete involving the sulfates from cement. Experiments involved the assessment of expansions, compressive and tensile strengths as well as microstructural characteristics over time. It was observed that tests performed on mortars and with a specific mix required an extended evaluation period to distinguish the behaviors. Furthermore, high early-strength cement featured the worst binder when faced with DEF.

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Author Biographies

Friancieli Tiecher, Escola Politécnica, Mestrado em Engenharia Civil, IMED, Passo Fundo, Brazil

Francieli Tiecher is a Professor and Coordinator of the Master's Program in Civil Engineering at IMED. She received her Ph.D. in civil engineering. Her research interests include durability of concrete structures, with an emphasis on alkali-silica reaction and sulfate attack.

Marinês Langoski, Engenharia Civil, IMED, Passo Fundo, Brazil

Marinês Langoski is a Researcher at the Department of Civil Engineering Research at IMED, Passo Fundo, Brazil. Her research interests include the durability of structures.

Nicole Hasparyk, Departamento de Durabilidade, Eletrobrás Furnas S.A., Aparecida de Goiânia, Brazil

Nicole Pagan Hasparyk works at ELETROBRAS Furnas with concrete structures from energy generation projects. She received her PhD from the Federal University of Rio Grande do Sul, Porto Alegre, Brazil. She received the ACI Wason Medal for Materials Research in 2003. Her research interests include concrete technology, microstructure, durability, particularly in expansive reactions such as alkali-aggregate reaction and sulphate attack, and sustainability issues.

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Published
2021-09-01
How to Cite
Tiecher, F., Langoski, M., & Hasparyk, N. (2021). Behavior of mortars with different types of cement when induced to Delayed Ettringite Formation (DEF). Revista ALCONPAT, 11(3), 1 - 16. https://doi.org/10.21041/ra.v11i3.537
Issue
Vol. 11 No. 3 (2021): Volumen 11, Número 3 (2021)
Section
Basic Research

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