A study on sampling methods for chloride profiles – simulations using data from EPMA
(2008) In Materials and Structures 41(7). p.1275-1281- 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) - 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)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/1030896
- author
- Wall, Henrik LU and Nilsson, Lars-Olof LU
- organization
- publishing date
- 2008
- 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
- 2016-04-01 12:36:08
- date last changed
- 2022-01-27 07:17:27
@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}},
doi = {{10.1617/s.11527-2007-9325-y}},
volume = {{41}},
year = {{2008}},
}