International Journal of Scientific Research and Engineering Development

GFRP reinforcement offers excellent resistance to corrosion; however, its vulnerability to high temperatures reduces the flexural performance of GFRP-reinforced concrete beams under fire exposure. This study investigates the influence of the retardant additives chitin and metakaolin on the durability and fire resistance of GFRP-reinforced concrete beams. Experimental investigations were conducted on a total of eight beams divided into four mix categories. For each mix, two beams were cast: one was tested under normal conditions using a four-point loading arrangement, while the other was subjected to fire exposure for one hour and subsequently tested under the same loading configuration to evaluate its post-fire flexural performance. The durability characteristics were assessed through water absorption, acid resistance, and carbonation tests. Comparison of the test results indicated that the incorporation of chitin and metakaolin improved the performance of the beams after fire exposure. In contrast, the control specimen exhibited better behaviour under normal loading conditions. The findings suggest that the use of chitin and metakaolin is beneficial for enhancing the durability and fire resistance of GFRP-reinforced concrete structures.

C Senthur Murugan, S Pauline,"Durability and Fire-Resistive Analysis of GFRP Bars with Retardant Additives in RC Beam" International Journal of Scientific Research and Engineering Development, V9(3): Page(2640-2653) May-June 2026. ISSN: 2581-7175. www.ijsred.com. Published by Scientific and Academic Research Publishing.