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Methodology for including the age effect of concrete with SCMs in results from accelerated testing

Elke Gruyaert UGent and Nele De Belie UGent (2012) Concrete repair, rehabilitation and retrofitting III. p.458-463
abstract
Concrete containing Supplementary Cementitious Materials (SCMs) such as Fly-Ash (FA) or Blast-Furnace Slag (BFS) shows a slower development of its microstructure when compared to mixes with Ordinary Portland Cement (OPC). However, concrete properties are mostly evaluated at the age of 28 days and also accelerated durability tests may start at that age. Therefore, it may be questioned whether the durability of concrete with SCMs is not underestimated when the attack in an accelerated test is concentrated in the initial stage of its lifetime, when its properties have not yet fully developed. On the other hand, when tests are started at later age, e.g. 6 months, one may criticize that in reality the concrete may undergo some degradation already before that age. Therefore, an alternative approach is suggested, in which degradation curves from accelerated tests starting at various ages are first converted to those corresponding with a real environment. Then, the degradation kinetics at different ages are combined into one final degradation curve. This principle is illustrated with data from accelerated carbonation tests in a 10 vol% CO2 atmosphere, carried out after 1, 3, 6 or 18 months of curing. The results are used to judge whether carbonation-initiated corrosion is a risk for the structure within its life span. In another approach to compare concrete with SCMs to OPC concrete, some researchers have attempted to determine k-values for fly ash, silica fume and slag with regard to different degradation mechanisms (mainly chloride ingress and carbonation). These k-values may also be time-dependent. An attempt was made to calculate k-values for slag with regard to chloride migration based on experimental test results using a graphical method. The obtained k-values are critically discussed.
Please use this url to cite or link to this publication:
author
organization
year
type
conference
publication status
published
subject
in
Concrete repair, rehabilitation and retrofitting III
editor
Mark G Alexander, Hans-Dieter Beushausen, Frank Dehn and Pilate Moyo
pages
458 - 463
publisher
CRC Press
place of publication
Leiden, The Netherlands
conference name
3rd International conference on Concrete Repair, Rehabilitation and Retrofitting (ICCRRR -2012)
conference location
Cape Town, South Africa
conference start
2012-09-03
conference end
2012-09-05
ISBN
9780415899529
language
English
UGent publication?
yes
classification
C1
copyright statement
I have transferred the copyright for this publication to the publisher
VABB id
c:vabb:339720
VABB type
VABB-5
id
2986521
handle
http://hdl.handle.net/1854/LU-2986521
date created
2012-09-13 14:45:13
date last changed
2015-06-17 10:14:25
@inproceedings{2986521,
  abstract     = {Concrete containing Supplementary Cementitious Materials (SCMs) such as Fly-Ash (FA) or Blast-Furnace Slag (BFS) shows a slower development of its microstructure when compared to mixes with Ordinary Portland Cement (OPC). However, concrete properties are mostly evaluated at the age of 28 days and also accelerated durability tests may start at that age. Therefore, it may be questioned whether the durability of concrete with SCMs is not underestimated when the attack in an accelerated test is concentrated in the initial stage of its lifetime, when its properties have not yet fully developed. On the other hand, when tests are started at later age, e.g. 6 months, one may criticize that in reality the concrete may undergo some degradation already before that age. Therefore, an alternative approach is suggested, in which degradation curves from accelerated tests starting at various ages are first converted to those corresponding with a real environment. Then, the degradation kinetics at different ages are combined into one final degradation curve. This principle is illustrated with data from accelerated carbonation tests in a 10 vol\% CO2 atmosphere, carried out after 1, 3, 6 or 18 months of curing. The results are used to judge whether carbonation-initiated corrosion is a risk for the structure within its life span. In another approach to compare concrete with SCMs to OPC concrete, some researchers have attempted to determine k-values for fly ash, silica fume and slag with regard to different degradation mechanisms (mainly chloride ingress and carbonation). These k-values may also be time-dependent. An attempt was made to calculate k-values for slag with regard to chloride migration based on experimental test results using a graphical method. The obtained k-values are critically discussed.},
  author       = {Gruyaert, Elke and De Belie, Nele},
  booktitle    = {Concrete repair, rehabilitation and retrofitting III},
  editor       = {Alexander, Mark G and Beushausen, Hans-Dieter and Dehn, Frank and Moyo, Pilate},
  isbn         = {9780415899529},
  language     = {eng},
  location     = {Cape Town, South Africa},
  pages        = {458--463},
  publisher    = {CRC Press},
  title        = {Methodology for including the age effect of concrete with SCMs in results from accelerated testing},
  year         = {2012},
}

Chicago
Gruyaert, Elke, and Nele De Belie. 2012. “Methodology for Including the Age Effect of Concrete with SCMs in Results from Accelerated Testing.” In Concrete Repair, Rehabilitation and Retrofitting III, ed. Mark G Alexander, Hans-Dieter Beushausen, Frank Dehn, and Pilate Moyo, 458–463. Leiden, The Netherlands: CRC Press.
APA
Gruyaert, E., & De Belie, N. (2012). Methodology for including the age effect of concrete with SCMs in results from accelerated testing. In M. G. Alexander, H.-D. Beushausen, F. Dehn, & P. Moyo (Eds.), Concrete repair, rehabilitation and retrofitting III (pp. 458–463). Presented at the 3rd International conference on Concrete Repair, Rehabilitation and Retrofitting (ICCRRR -2012), Leiden, The Netherlands: CRC Press.
Vancouver
1.
Gruyaert E, De Belie N. Methodology for including the age effect of concrete with SCMs in results from accelerated testing. In: Alexander MG, Beushausen H-D, Dehn F, Moyo P, editors. Concrete repair, rehabilitation and retrofitting III. Leiden, The Netherlands: CRC Press; 2012. p. 458–63.
MLA
Gruyaert, Elke, and Nele De Belie. “Methodology for Including the Age Effect of Concrete with SCMs in Results from Accelerated Testing.” Concrete Repair, Rehabilitation and Retrofitting III. Ed. Mark G Alexander et al. Leiden, The Netherlands: CRC Press, 2012. 458–463. Print.