Problem: 

• RCC frame of cold storage was damaged after exposing to fire for longer duration
• Excessive deflections were observed in few locations
• NDT results indicated lower velocity in UPV test, implying poor quality of concrete
• Core showed porosity and lower compressive strength
• Bonding capacity of cement paste reduced when subjected to higher temperature
• Exposure to high temperature caused micro cracking and spalling in concrete

Solution:

• Repairing was carried out by grouting low viscosity monomers to seal the micro cracks and improving the micro structure of concrete.
• Spalled portions were treated by polymer modified mortar
• Additional steel supports were introduced to control the deflection
• Instead of conventional wrap system, factory made composite profiles were used
• Composites were fixed at site by chemical adhesive and mechanical anchors
• Project was completed in 60 days period
• Post Repair NDT result were satisfactory indicating improvement in velocity results