Abstract
Fibre Reinforced Polymers are widely used for retrofitting and strengthening of structures. The integrity of fibre matrix system in FRP system would be severely compromised in situations where the system is exposed to elevated temperatures. In this paper, an Alkali Activated Siliceous Paste (AASP) has been developed as a temperature tolerant adhesive for FRP systems. AASP has been compared with the conventional fibre-epoxy system and the fibre-epoxy system. It has also been tested as a thermal insulation overlay on the epoxy. The test has been performed by applying three-point flexure. Simultaneously, Acoustic Emission events have been recorded to understand the failure characteristics in each case. To understand the microstructural effect scanning electron micrographs and energy dispersive X-ray analysis have been performed. The conventional epoxy system suffered a loss in integrity after the glass transition temperature of epoxy. AASP specimens offered considerably improved thermal performance but the bonding with concrete was variable due to inadequate penetration into the fibre sheet. AASP overlays prevented visual degradation of the epoxy from elevated temperature but couldn't help prevent the development of heat gradient. AASP has a great potential to be developed as a temperature tolerant adhesive but its rheology must be improved for ensuring reliable bonding between the fibres and concrete.
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