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A study on sampling methods for chloride profiles – simulations using data from EPMA

Wall, Henrik LU and Nilsson, Lars-Olof LU (2008) In Materials and Structures 41(7). p.1275-1281
Abstract (Swedish)
Abstract in French

La de´termination du profil de concentration

en chlorures dans un be´ton d’une structure

soumise a` un environnement marin est une de´marche

usuelle pour une pre´diction de la dure´e de service

re´siduelle de la structure. Les me´thodes d’e´chantillonnage

les plus communes sont le pre´le`vement de

poudre par forage ou le carottage a` sec a` profondeurs

croissantes pour dosages de chlorures en

laboratoire. Ici une e´tude similaire a e´te´ re´alise´e en

simulant diffe´rentes techniques d’e´chantillonnage

recueillies des donne´es d’EPMA. Les re´sultats des

simulations des e´chantillons de be´ton analyse´s... (More)
Abstract in French

La de´termination du profil de concentration

en chlorures dans un be´ton d’une structure

soumise a` un environnement marin est une de´marche

usuelle pour une pre´diction de la dure´e de service

re´siduelle de la structure. Les me´thodes d’e´chantillonnage

les plus communes sont le pre´le`vement de

poudre par forage ou le carottage a` sec a` profondeurs

croissantes pour dosages de chlorures en

laboratoire. Ici une e´tude similaire a e´te´ re´alise´e en

simulant diffe´rentes techniques d’e´chantillonnage

recueillies des donne´es d’EPMA. Les re´sultats des

simulations des e´chantillons de be´ton analyse´s avec

l’EPMA confirment ceux obtenus pre´ce´demment a`

partir de pre´le`vements de poudre par forage. Ils

montrent e´galement les meˆmes e´tendues de variations

lorsque les teneurs en chlorures sont exprime´es en %

de masse de be´ton plutoˆt qu’en % de masse d’oxyde

de calcium. La comparaison des re´sultats obtenus

pre´ce´demment par pre´le`vement de poudre avec ceux

des simulations de l’EPMA montre que le pre´le`vement

de poudre est probablement affecte´ d’une erreur

syste´matique engendre´e par « le mouvement » de la

poudre dans le forage. Par ailleurs, cette e´tude

montre l’effet des granulats de grande taille dans les forages de taille limite´e meˆme si la teneur en ciment

est une re´fe´rence. Cependant, aucun effet des granulats

n’a e´te´ constate´ au cours des simulations. Le

forage horizontal a e´te´ e´galement simule´ afin de

pouvoir de´tecter cet effet possible de granulats sur la

pe´ne´tration des chlorures dans le be´ton. (Less)
Abstract
Investigating marine concrete by determining

the chloride profile is a common way for

making a prediction of the remaining service life of a

structure. The most common methods of sampling

concrete for this purpose is dust sampling by dry

drilling or sampling cores which are analyzed by

profile grinding in a laboratory. Now, a similar study

has been performed, by simulating different sampling

techniques in data from EPMA. The results from the

simulations of the concrete specimen analyzed with

the EPMA, confirm the results from earlier performed

dry drilling tests in laboratory and shows the same

extensive variations when chloride... (More)
Investigating marine concrete by determining

the chloride profile is a common way for

making a prediction of the remaining service life of a

structure. The most common methods of sampling

concrete for this purpose is dust sampling by dry

drilling or sampling cores which are analyzed by

profile grinding in a laboratory. Now, a similar study

has been performed, by simulating different sampling

techniques in data from EPMA. The results from the

simulations of the concrete specimen analyzed with

the EPMA, confirm the results from earlier performed

dry drilling tests in laboratory and shows the same

extensive variations when chloride content is presented

as % by weight of concrete instead of as % by

weight of calcium oxide. Comparing the results from

the earlier performed sampling by dry drilling with

the results from the EPMA simulations, it is seen that

the dry drilling probably is afflicted with a systematic

error by ‘‘movement’’ of dust into the sampling holes

when drilling. This study also shows effects of large

aggregates in small bores even though the cement

content is referred to. However, no signs of ‘‘shadowing’’

by the aggregates was detected when the

simulations where performed. Even ‘‘horizontal’’

drilling was simulated in order to be able to detect

this possible effect of the aggregates on the chloride

ingress into the concrete. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Materials and Structures
volume
41
issue
7
pages
1275 - 1281
publisher
Springer
external identifiers
  • wos:000257211800008
  • scopus:46149108618
ISSN
1359-5997
DOI
10.1617/s.11527-2007-9325-y
language
English
LU publication?
yes
id
2d8d89f1-280f-4010-a80c-de88633189a8 (old id 1030896)
date added to LUP
2008-02-12 19:39:02
date last changed
2017-08-13 03:48:16
@article{2d8d89f1-280f-4010-a80c-de88633189a8,
  abstract     = {Investigating marine concrete by determining<br/><br>
the chloride profile is a common way for<br/><br>
making a prediction of the remaining service life of a<br/><br>
structure. The most common methods of sampling<br/><br>
concrete for this purpose is dust sampling by dry<br/><br>
drilling or sampling cores which are analyzed by<br/><br>
profile grinding in a laboratory. Now, a similar study<br/><br>
has been performed, by simulating different sampling<br/><br>
techniques in data from EPMA. The results from the<br/><br>
simulations of the concrete specimen analyzed with<br/><br>
the EPMA, confirm the results from earlier performed<br/><br>
dry drilling tests in laboratory and shows the same<br/><br>
extensive variations when chloride content is presented<br/><br>
as % by weight of concrete instead of as % by<br/><br>
weight of calcium oxide. Comparing the results from<br/><br>
the earlier performed sampling by dry drilling with<br/><br>
the results from the EPMA simulations, it is seen that<br/><br>
the dry drilling probably is afflicted with a systematic<br/><br>
error by ‘‘movement’’ of dust into the sampling holes<br/><br>
when drilling. This study also shows effects of large<br/><br>
aggregates in small bores even though the cement<br/><br>
content is referred to. However, no signs of ‘‘shadowing’’<br/><br>
by the aggregates was detected when the<br/><br>
simulations where performed. Even ‘‘horizontal’’<br/><br>
drilling was simulated in order to be able to detect<br/><br>
this possible effect of the aggregates on the chloride<br/><br>
ingress into the concrete.},
  author       = {Wall, Henrik and Nilsson, Lars-Olof},
  issn         = {1359-5997},
  language     = {eng},
  number       = {7},
  pages        = {1275--1281},
  publisher    = {Springer},
  series       = {Materials and Structures},
  title        = {A study on sampling methods for chloride profiles – simulations using data from EPMA},
  url          = {http://dx.doi.org/10.1617/s.11527-2007-9325-y},
  volume       = {41},
  year         = {2008},
}