• Hritwik Sharma
• Shrikant Mishra

This research focuses on the structural health assessment and subsequent rehabilitation of a reinforced concrete (RCC) box culvert ( 3 x 6.0m span) situated on the Odisha Border-Aurang section of NH-6. Initial inspections revealed flexural cracking, prompting a deeper investigation to determine the root causes and current structural safety. The study adopted a combined approach, utilizing theoretical design analysis alongside on-site diagnostic testing. A full-scale Bridge Load Test was executed using a 45-tonne vehicle (IRC Class A) following IRC SP-51 guidelines, supplemented by Non-Destructive Testing (NDT) methods including Ultrasonic Pulse Velocity (UPV), Rebound Hammer, and Carbonation depth analysis. While the load test indicated excellent elastic recovery (100%), surpassing the mandatory 75% limit, the structure failed serviceability requirements due to tension cracks exceeding the permissible 0.3 mm width. Based on these results, the study evaluates two retrofitting options: Carbon Fiber Reinforced Polymer (CFRP) and Glass Fiber Reinforced Polymer (GFRP) laminates. Structural calculations indicated that while GFRP has a lower material cost, its lower modulus of elasticity necessitates 13 layers to achieve the same crack control as just 2 layers of CFRP. Therefore, CFRP was identified as the most technically and economically viable solution for this heavy-loading scenario. The proposed rehabilitation strategy involves epoxy grouting followed by the bonding of carbon fiber laminates to the deck slab.

"COMPARATIVE STRUCTURAL ANALYSIS AND REHABILITATION OF RCC BOX CULVERT USING CFRP VS. GFRP COMPOSITES: A CASE STUDY ON NH-6", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.13, Issue 1, page no.a78-a95, January-2026, Available :http://www.jetir.org/papers/JETIR2601010.pdf

"COMPARATIVE STRUCTURAL ANALYSIS AND REHABILITATION OF RCC BOX CULVERT USING CFRP VS. GFRP COMPOSITES: A CASE STUDY ON NH-6", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.13, Issue 1, page no. ppa78-a95, January-2026, Available at : http://www.jetir.org/papers/JETIR2601010.pdf