Fire Damaged Structure
Cold Storage Structure, Navi Mumbai
Cold Storage Structure, Navi Mumbai
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
Office Building for Crompton Greaves
Office Building for Crompton Greaves
Problem:
- Due to a fire first floor slab was badly affected with micro cracks all over the area.
- Bonding strength of cement had reduced and the NDT velocity values were also on lower side
- Some ceiling panels also showed signs of distress
Solution:
- Cracks were grouted with low viscosity high molecular weight monomer grout
- Spalled concrete was replaced with thixotropic mortar
- Sagged lintels were re-casted and all areas were re-plastered
- External portion of building was treated with a waterproof elastomeric coating
- Internal work was completed in a time span of 30 days