10th International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering (CICE), İstanbul, Turkey, 8 - 10 December 2021, vol.198, pp.809-822
Glass fibre reinforced polymers (GFRP) have great potential to improve the performance of existing structures, but the resin used to bond the fibres in the composite is generally flammable and temperature sensitive that inhibit their application in the rehabilitation of structures. To better understand thermal behavior of the GFRP sheets, tensile tests were performed replicating field conditions as part of an extensive study on the effects of climate change on the performance of structures. Tests were conducted under two scenarios 1) specimens were subjected to a sustained temperature and then monotonically loaded to failure and 2) specimens were subjected to sustained constant tensile load or sustained constant deformation following which temperature was increased until the specimen failed. A sudden drop in the mechanical properties of the GFRP was observed as the temperature approached the glass transition temperature 'T-g ' However, a stable level of mechanical properties, similar to 185 MPa tensile strength and similar to 16.5 GPa tensile modulus, maintained beyond T-g until about 250 degrees C due to the fibres' contribution in the composite in both scenarios. An analytical model was also developed to capture the mechanical properties of the GFRP under elevated temperatures. The elevated temperatures not only impacted the mechanical properties but also changed the failure mode of the composite from brittle to ductile with softer failure at high temperatures.