Influence of frost damage and sample preconditioning on the porosity characterization of cement based materials using low temperature calorimetry

Min Wu, Katja Fridh, Björn Johannesson, Mette Rica Geiker

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Low temperature calorimetry (LTC) can be used to study the meso-porosity of cement based materials. The influence of frost damage on the meso-porosity determination by LTC was explored on a model material MCM-41 and two cement pastes by conducting repeated cycles of freezing and melting measurements. The results indicate that the pressure generated during freezing and melting measurements has little impact on the pore structure of the powder MCM-41 samples. As for the studied cylinder samples of cement pastes, frost damage probably took place and it changed the pore connectivity while it had limited effect on changing the interior size distribution of the meso-pores. The analysis of the freezing and melting behavior of the pore liquid of cement based materials is complicated by the presence of ions. The freezing and melting behavior of the pore solution of cement paste samples preconditioned in either a small amount or a big amount of saturated limewater was compared. The results suggest that either the preconditioning in a big amount of limewater does not change the ionic concentration of the pore solution very much or the possible leaching of ions from cement hydrates during the preconditioning has limited influence on the freezing and melting behavior of the pore solution in the studied cement paste samples.
Original languageEnglish
JournalThermochimica Acta
Volume607
Pages (from-to)30-38
Number of pages9
ISSN0040-6031
DOIs
Publication statusPublished - 2015

Keywords

  • Calorimetry
  • Cement paste
  • Cryoporometry
  • Freezing and thawing
  • Frost damage
  • Thermoporometry
  • Calorimeters
  • Characterization
  • Freezing
  • Hydrated lime
  • Hydrates
  • Melting
  • Porosity
  • Temperature
  • Cements

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