Damage in cement pastes and mortars exposed to CaCl2 and low-temperature cycles

Nima Hosseinzadeh, Luca Montanari, Chunyu Qiao, Prannoy Suraneni

Research output: Contribution to journalArticlepeer-review

Abstract

The formation of calcium oxychloride in cold conditions due to a reaction between calcium chloride deicing salt and calcium hydroxide in the concrete causes substantial damage to pavement concretes. In this study, the role of supplementary cementitious materials (SCMs) in mitigating damage in cement pastes and mortars exposed to highly concentrated CaCl2 solutions and low temperatures is elucidated. Cementitious paste and mortar mixtures designed with different SCM replacement levels were prepared and immersed in 25% CaCl2 solutions and subject to low-temperature cycles (− 8–25 °C) for 360 days (180 cycles). Damage was reduced as the SCM replacement level and curing time were increased, as confirmed by bulk resistivity, visual observation, and light microscopy measurements. Substantial differences between paste and mortar behavior were observed with the mortars outperforming pastes.

Original languageEnglish (US)
Article number105
JournalMaterials and Structures/Materiaux et Constructions
Volume55
Issue number3
DOIs
StatePublished - Apr 2022
Externally publishedYes

Keywords

  • Calcium oxychloride
  • Deicing salt
  • Low-temperature
  • Non-destructive testing
  • Supplementary cementitious materials

ASJC Scopus subject areas

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

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