Influence of frost damage and sample preconditioning on the porosity characterization of cement based materials using low temperature calorimetry
Författare
Summary, in English
Low temperature calorimetry (LTC) can be used to study the mesa-porosity of cement based materials. The influence of frost damage on the mesa-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 mesa-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. (C) 2015 Elsevier B.V. All rights reserved.
Avdelning/ar
Publiceringsår
2015
Språk
Engelska
Sidor
30-38
Publikation/Tidskrift/Serie
Thermochimica Acta
Volym
607
Dokumenttyp
Artikel i tidskrift
Förlag
Elsevier
Ämne
- Building Technologies
Nyckelord
- Cement paste
- Calorimetry
- Freezing and thawing
- Frost damage
- Thermoporometry
- Cryoporometry
Status
Published
ISBN/ISSN/Övrigt
- ISSN: 0040-6031