Long-term monitoring of a CFRP-wrapped concrete column

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ConferenceFourth Canadian International Composites Conference: 19 August 2003, Ottawa, Ontario
Pages112; # of pages: 12
Subjectcarbon fibre, non-destructive evaluation, reinforced concrete, testing/evaluation; Fibre-reinforced polymers (FRP); Concrete
AbstractFibre-reinforced polymer laminates are now used on a regular basis for repairs to concrete members. The laminates can be wrapped around an entire member or applied to any portion once the member has been repaired and its surface properly prepared to receive the laminate. However, two questions have arisen as to the suitability of the laminates in affecting a satisfactory long-term repair for concrete members; namely,i) Do the laminates alter the properties of the concrete or the chemical environment within the concrete, which is critical to the survival of the steel reinforcement?ii) How well and for how long do the laminates bond to repaired and original concrete surfaces?To obtain some answers to these questions, the performance of a pair of square concrete columns has been monitored since 1996. The columns straddle an expansion joint within a heated multi-level, underground parking garage in Gatineau, Quebec. About a year after extensive repairs were made to the concrete structure, one column was completely covered with a carbon fibre-reinforced polymer (CFRP) and the second left in its reconditioned state to serve as the control for the study. A data acquisition system comprising a multi-channel data recorder and an array of relative humidity and temperature sensors and strain gauges was installed to continuously monitor conditions in the columns. In addition, annual non-destructive electro-chemical and sonic surveys were conducted on the columns to assist in examining the effects of the laminate. As pull-off tests on the wrapped column were undesirable because of the need to patch and reseal tested areas, a set of concrete specimens, divided into garage and control samples, was coated with the laminate and tested yearly to monitor pull-off strength. This paper will present the data collected during the past six years and discuss the effects of the laminate on the conditions and properties of a concrete.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number46288
NPARC number20386438
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Record identifiera5de99d1-565a-4530-b9d1-d7d648d0724b
Record created2012-07-25
Record modified2016-05-09
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