Abstract
Fiber reinforced polymer (FRP) has been developed to be applied for a strengthening of the deteriorated structures. In the form of a sheet, the FRP may be applied for the strengthening of the structures by bonding it to the concrete surface. Glass composed FRP (GFRP) sheet is most commonly used due to its relatively lower cost compared to the other FRP materials. GFRP sheet is applied externally by bonding it on the concrete surface. The strengthened structures should be monitored periodically to ensure the health of the strengthened structures. Regarding the development of monitoring system of the strengthened structure, it is important to study the delamination phenomenon of the bonded GFRP. Therefore the delamination mechanism is important to be clarified. Many studies have been done to investigate the bonding characteristics of GFRP sheet under direct tensile loading. However, the studies on the bonding characteristics of GFRP sheet on the strengthened beams due to flexural loadings are still limited. A series of concrete beams strengthened with GFRP sheet on extreme tension surface were prepared. The beam specimens ware loaded under four-point bending test gradually up to the ultimate capacity. Results indicated that prior to final delamination, a local delamination occurred which was indicated by the suddenly decreasing of an applied load. The delamination of the GFRP sheet may be initiated by the flexural cracks occurred on the beams.
Highlights
Strengthening technique is a major field that has been developed for repairing or retrofit existing structures
The glass fiber reinforced plastics (GFRP) sheet is bonded to the concrete surface to have its advantages in the flexural action of the beams
This study presents a study on the delamination mechanism of the GFRP sheet bonded on a concrete beam due to a flexural load
Summary
Strengthening technique is a major field that has been developed for repairing or retrofit existing structures. The FRP in the form of a sheet may be applied by bonding it to the concrete surface. The GFRP sheet is bonded to the concrete surface to have its advantages in the flexural action of the beams. This study presents a study on the delamination mechanism of the GFRP sheet bonded on a concrete beam due to a flexural load. The epoxy resin was applied to the GFRP sheet placed on the table using a soft roller to impregnate all the fibers in the resin. The GFRP has a tensile strength of 575 MPa with an elastic modulus of 26.1 GPa. The bonding strength of the epoxy resin to the concrete based on manufacturer data sheet is 2.12 MPa [13]
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