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Effect of drying at an early age on the moisture distributions in concrete specimens used for air permeability test

Luping, Tang and Nilsson, Lars-Olof LU (1993) In Nordic Concrete Research p.88-97
Abstract
The concrete discs with water-cement ratios 0.4 and 0.7 were preconditioned at their early age by drying at 50`C for 2 to 4 days, followed by storage in a Laboratory atmosphere till an age of 28 or S6 days. The moisture distributions in the specimens were determined by measuring relative humidity and capillary saturation degree, and the air permeability was determined according to the Cembureau method. The results show that drying at an early age, although it reduced the total moisture content, eventually increased the moisture gradients which might introduce new cracks in the specimens. The relationships between relative humidity and capillary saturation degree at different depths are used to indicate the heterogeneity originating from... (More)
The concrete discs with water-cement ratios 0.4 and 0.7 were preconditioned at their early age by drying at 50`C for 2 to 4 days, followed by storage in a Laboratory atmosphere till an age of 28 or S6 days. The moisture distributions in the specimens were determined by measuring relative humidity and capillary saturation degree, and the air permeability was determined according to the Cembureau method. The results show that drying at an early age, although it reduced the total moisture content, eventually increased the moisture gradients which might introduce new cracks in the specimens. The relationships between relative humidity and capillary saturation degree at different depths are used to indicate the heterogeneity originating from the preconditioning. (Less)
Please use this url to cite or link to this publication:
author
publishing date
type
Contribution to journal
publication status
published
subject
keywords
capillary suction, drying, moisture distribution, moisture, concrete, permeability.
in
Nordic Concrete Research
pages
88 - 97
publisher
Norsk Betongforening
external identifiers
  • Other:1993/2
ISSN
0800-6377
language
English
LU publication?
no
id
9966ab74-be5f-4702-aa1d-89796ead4d3d (old id 1485700)
alternative location
http://www.nordicconcrete.org/
date added to LUP
2009-10-05 10:44:05
date last changed
2016-06-29 09:08:04
@misc{9966ab74-be5f-4702-aa1d-89796ead4d3d,
  abstract     = {The concrete discs with water-cement ratios 0.4 and 0.7 were preconditioned at their early age by drying at 50`C for 2 to 4 days, followed by storage in a Laboratory atmosphere till an age of 28 or S6 days. The moisture distributions in the specimens were determined by measuring relative humidity and capillary saturation degree, and the air permeability was determined according to the Cembureau method. The results show that drying at an early age, although it reduced the total moisture content, eventually increased the moisture gradients which might introduce new cracks in the specimens. The relationships between relative humidity and capillary saturation degree at different depths are used to indicate the heterogeneity originating from the preconditioning.},
  author       = {Luping, Tang and Nilsson, Lars-Olof},
  issn         = {0800-6377},
  keyword      = {capillary suction,drying,moisture distribution,moisture,concrete,permeability.},
  language     = {eng},
  pages        = {88--97},
  publisher    = {ARRAY(0x9b5ce78)},
  series       = {Nordic Concrete Research},
  title        = {Effect of drying at an early age on the moisture distributions in concrete specimens used for air permeability test},
  year         = {1993},
}