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Conditions for Carbonation of Silica Fume Concretes

Persson, Bertil LU (1998) In 5th International Workshop on Material Properties and Design - Durable Concrete Structures p.415-438
Abstract
This article outlines an experimental and numerical study on the pozzolanic interaction limits for carbonation of silica fume concretes. For this purpose cylinders of 8 types of High-Performance Concrete were cast. Carbonation and weight losses were studied parallel. An indirect method was used to measure carbonation; i.e. carbonation shrinkage was observed. The age of concrete at start of carbonation was defined in relation to the weight increase of the specimen. Parallel studies on the effect of w/c, silica fume and age on shrinkage of silica fume concretes were performed. Internal relative humidity and strength were investigated on cubes from the same batches of concretes that were used in the studies of carbonation. After 5-6 years (in... (More)
This article outlines an experimental and numerical study on the pozzolanic interaction limits for carbonation of silica fume concretes. For this purpose cylinders of 8 types of High-Performance Concrete were cast. Carbonation and weight losses were studied parallel. An indirect method was used to measure carbonation; i.e. carbonation shrinkage was observed. The age of concrete at start of carbonation was defined in relation to the weight increase of the specimen. Parallel studies on the effect of w/c, silica fume and age on shrinkage of silica fume concretes were performed. Internal relative humidity and strength were investigated on cubes from the same batches of concretes that were used in the studies of carbonation. After 5-6 years (in 1997-1998) the carbonation depth was detected, which showed good correlation with the carbonation shrinkage. With low w/c ratio and sufficient amount of silica fume no carbonation shrinkage and no carbonation was observed. The results also indicate well-correlated relationships between shrinkage, w/c and RH. The type and amount of silica fume affected shrinkage. Sufficiently long sealed curing at water-cement ratio 0.30 and 10% silica fume content, prevented carbonation for at least 5 years. The study was performed at Lund University in 1992-1998. (Less)
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author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
silica fume, shrinkage, relative humidity, high-performance concrete, durability, Carbonation, concrete
in
5th International Workshop on Material Properties and Design - Durable Concrete Structures
editor
Folker, Wittman and Peter, Schwesinger
pages
415 - 438
publisher
AEDIFICATIO Verlag GmbH, Freiburg and Unterengstringen
ISBN
3-931681-26-2
language
English
LU publication?
yes
id
5bb30b65-9b67-4311-a5e7-470d2d463b1f (old id 526628)
date added to LUP
2007-09-13 11:36:25
date last changed
2016-04-16 10:20:37
@misc{5bb30b65-9b67-4311-a5e7-470d2d463b1f,
  abstract     = {This article outlines an experimental and numerical study on the pozzolanic interaction limits for carbonation of silica fume concretes. For this purpose cylinders of 8 types of High-Performance Concrete were cast. Carbonation and weight losses were studied parallel. An indirect method was used to measure carbonation; i.e. carbonation shrinkage was observed. The age of concrete at start of carbonation was defined in relation to the weight increase of the specimen. Parallel studies on the effect of w/c, silica fume and age on shrinkage of silica fume concretes were performed. Internal relative humidity and strength were investigated on cubes from the same batches of concretes that were used in the studies of carbonation. After 5-6 years (in 1997-1998) the carbonation depth was detected, which showed good correlation with the carbonation shrinkage. With low w/c ratio and sufficient amount of silica fume no carbonation shrinkage and no carbonation was observed. The results also indicate well-correlated relationships between shrinkage, w/c and RH. The type and amount of silica fume affected shrinkage. Sufficiently long sealed curing at water-cement ratio 0.30 and 10% silica fume content, prevented carbonation for at least 5 years. The study was performed at Lund University in 1992-1998.},
  author       = {Persson, Bertil},
  editor       = {Folker, Wittman and Peter, Schwesinger},
  isbn         = {3-931681-26-2},
  keyword      = {silica fume,shrinkage,relative humidity,high-performance concrete,durability,Carbonation,concrete},
  language     = {eng},
  pages        = {415--438},
  publisher    = {ARRAY(0x8689b30)},
  series       = {5th International Workshop on Material Properties and Design - Durable Concrete Structures},
  title        = {Conditions for Carbonation of Silica Fume Concretes},
  year         = {1998},
}