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Microstructural changes caused by carbonation of cement mortar

Johannesson, Björn LU and Utgenannt, Peter LU (2001) In Cement and Concrete Research 31(6). p.925-931
Abstract
The change of specific surface area and pore size distribution due to carbonation of an ordinary Portland cement mortar is investigated. The adsorption of water vapor on noncarbonated and well-carbonated cement mortar is measured in order to evaluate the difference in specific surface area for the two samples using the BET theory. From the measured desorption the pore size distribution is calculated using the Kelvin formula. A sorption balance is used to measure the sorption characteristics for the two studied sample qualities. In this method dry and saturated air are mixed in desired proportion in a closed system. One of the benefits of the method is that the samples not are exposed to carbon dioxide during testing, i.e., undesired... (More)
The change of specific surface area and pore size distribution due to carbonation of an ordinary Portland cement mortar is investigated. The adsorption of water vapor on noncarbonated and well-carbonated cement mortar is measured in order to evaluate the difference in specific surface area for the two samples using the BET theory. From the measured desorption the pore size distribution is calculated using the Kelvin formula. A sorption balance is used to measure the sorption characteristics for the two studied sample qualities. In this method dry and saturated air are mixed in desired proportion in a closed system. One of the benefits of the method is that the samples not are exposed to carbon dioxide during testing, i.e., undesired effects caused by carbonation on the sorption can be eliminated. The specific surface area for a noncarbonated sample was calculated, using the measured adsorption data, to be 8% higher than for the well-carbonated sample. The difference in pore size distributions was more marked than the difference in specific surface area for the two samples. The well-carbonated mortar had about twice as much volume attributed to small pores as the noncarbonated cement mortar. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Cement mortar, Carbonation, Sorption, Pore size, Distribution, BET equation
in
Cement and Concrete Research
volume
31
issue
6
pages
925 - 931
publisher
Elsevier
external identifiers
  • Scopus:0035331660
ISSN
0008-8846
DOI
10.1016/S0008-8846(01)00498-7
language
English
LU publication?
yes
id
271c6eda-33b6-4125-b07c-299462eeb2cc (old id 1529122)
date added to LUP
2010-01-18 09:16:46
date last changed
2016-12-04 04:41:27
@misc{271c6eda-33b6-4125-b07c-299462eeb2cc,
  abstract     = {The change of specific surface area and pore size distribution due to carbonation of an ordinary Portland cement mortar is investigated. The adsorption of water vapor on noncarbonated and well-carbonated cement mortar is measured in order to evaluate the difference in specific surface area for the two samples using the BET theory. From the measured desorption the pore size distribution is calculated using the Kelvin formula. A sorption balance is used to measure the sorption characteristics for the two studied sample qualities. In this method dry and saturated air are mixed in desired proportion in a closed system. One of the benefits of the method is that the samples not are exposed to carbon dioxide during testing, i.e., undesired effects caused by carbonation on the sorption can be eliminated. The specific surface area for a noncarbonated sample was calculated, using the measured adsorption data, to be 8% higher than for the well-carbonated sample. The difference in pore size distributions was more marked than the difference in specific surface area for the two samples. The well-carbonated mortar had about twice as much volume attributed to small pores as the noncarbonated cement mortar.},
  author       = {Johannesson, Björn and Utgenannt, Peter},
  issn         = {0008-8846},
  keyword      = {Cement mortar,Carbonation,Sorption,Pore size,Distribution,BET equation},
  language     = {eng},
  number       = {6},
  pages        = {925--931},
  publisher    = {ARRAY(0x87626f0)},
  series       = {Cement and Concrete Research},
  title        = {Microstructural changes caused by carbonation of cement mortar},
  url          = {http://dx.doi.org/10.1016/S0008-8846(01)00498-7},
  volume       = {31},
  year         = {2001},
}