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

Wu, Min; Fridh, Katja LU ; Johannesson, Bjorn and Geiker, Mette (2015) In Thermochimica Acta 607. p.30-38
Abstract
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... (More)
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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Cement paste, Calorimetry, Freezing and thawing, Frost damage, Thermoporometry, Cryoporometry
in
Thermochimica Acta
volume
607
pages
30 - 38
publisher
Elsevier
external identifiers
  • wos:000354139300004
  • scopus:84926136066
ISSN
0040-6031
DOI
10.1016/j.tca.2015.03.005
language
English
LU publication?
yes
id
290d6b71-863e-441f-b120-6be9d6dfcdc1 (old id 7431998)
date added to LUP
2015-06-25 12:58:04
date last changed
2017-01-01 06:17:30
@article{290d6b71-863e-441f-b120-6be9d6dfcdc1,
  abstract     = {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.},
  author       = {Wu, Min and Fridh, Katja and Johannesson, Bjorn and Geiker, Mette},
  issn         = {0040-6031},
  keyword      = {Cement paste,Calorimetry,Freezing and thawing,Frost damage,Thermoporometry,Cryoporometry},
  language     = {eng},
  pages        = {30--38},
  publisher    = {Elsevier},
  series       = {Thermochimica Acta},
  title        = {Influence of frost damage and sample preconditioning on the porosity characterization of cement based materials using low temperature calorimetry},
  url          = {http://dx.doi.org/10.1016/j.tca.2015.03.005},
  volume       = {607},
  year         = {2015},
}