A study on sampling methods for chloride profiles – simulations using data from EPMA
Author
Summary, in English
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.
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.
Department/s
Publishing year
2008
Language
English
Pages
1275-1281
Publication/Series
Materials and Structures
Volume
41
Issue
7
Document type
Journal article
Publisher
Springer
Topic
- Materials Engineering
Status
Published
ISBN/ISSN/Other
- ISSN: 1359-5997