Condition assessment of structural components using non-destructive techniques

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ConferenceProceedings of the Joint NSC-NRC Workshop on Construction Technologies: 26 April 2004, Taipei, Taiwan
Pages5768; # of pages: 12
Subjectsoil nail, nondestructive techniques, impulse response, FRP laminate, condition monitoring; Fibre-reinforced polymers (FRP)
AbstractCondition assessment of components is an important aspect for determining repair strategies of ageing structural systems and for ascertaining the durability of the repairs once they are effected. Two projects have been undertaken by the ?Concrete Materials and Structural Technologies Group? at the Institute for Research in Construction of the National Research Council Canada for studying both aspects of repairs. The first project is investigating the effectiveness of a sonic wave technique in accurately determining the in-situ length of newly installed soil nails. Once soil nails are inserted into the ground, their length can only be readily verified by destructively removing them. This project examines the efficacy of using the impulse-response technique to ascertain the length of grouted and ungrouted soil nails containing one or more coupled sections of steel bars. The second project is studying the effect of a fibre-reinforced polymer (FRP) laminate on the internal conditions of a steel reinforced concrete column. Two adjacent columns, one wrapped with a FRP laminate and the second left in its existing condition have been monitored over a period of many years. The monitoring comprises annual non-destructive sonic and electro-chemical surveys and continuous on-site recording of relative humidities and temperatures. The objective of the study is to determine whether the laminate affects the internal electro-chemical environment within the wrapped column so as to reduce the durability of the primary steel reinforcement. This paper gives a brief overview of the two projects and summarises what has been learned to date.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number47059
NPARC number20377056
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Record identifier0ef65d58-3231-403e-9f8f-4be6f9dae710
Record created2012-07-24
Record modified2016-05-09
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