Abstract
It has been more than two decades, since FRP strengthening method was first time used in Poland. Therefore there is a natural need to develop an efficient quality assessment technique to verify design assumptions of strengthening in existing structures after many years. One of the promising non-destructive method of quality assessment is infrared thermography (IRT). In this paper, an initial study on recognition of delamination mainly in CFRP laminates using IRT was conducted as well as the influence of long-term loads on defects in CFRP strengthened RC beams was presented.
Highlights
One of the most popular strengthening method is using Fiber Reinforced Polymer (FRP)
Connections between composite and surface of structural member prepared in a regardless way can lead to hidden defects or voids as well as discontinuities in the bonding layer
None of them was directed to structural members strengthened with FRP and estimation of the load bearing capacity based on quality and the current state of the
Summary
One of the most popular strengthening method is using Fiber Reinforced Polymer (FRP). After many years of using those strengthening techniques it is required to use efficient methods of quality assessment of connections between strengthened member and composite, during construction stage and during periodic inspections of existing structures [2]. It is especially important for structures under long-term loads. Connections between composite and surface of structural member prepared in a regardless way can lead to hidden defects or voids as well as discontinuities in the bonding layer As a consequence, it can result in local delamination of material which means that composite connection does not meet required criteria anymore
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