RCC Repair?
- Check the soundness of the substrate with help of hammer and remove the hollow portion
- Cut the periphery of the surface into regular shape with the help of mechanical cutter for better bonding
- Check for the rusted bars; if the cross-section of the bars is less than 20% then replace the bar
- Expose the bars from the circumference by removing the concrete from entire periphery and remove all scale and corrosion deposits mechanically or ideally by sand blasting
- Apply suitable rust convertor on the entire periphery of the bar
- Wait for 30 minutes and then wash off the bar with the help of water jet
- Allow excess water to evaporate and let it come into SSD condition
- Mix Constrocare Bond Crete or similar with neat cement in the ration of 1:1 by vol. Apply this coat on rebars and allow it to dry for 3-6 hours
- Again, brush-apply a single neat coat with Constrocare Bond Crete or similar mixed with cement in the ration 1:1 by vol on the rebars and its adjoining concrete
- Allow this coat to become tacky and then immediately hand press polymer modified mortar. If the bond coat is dried, apply another to ensure effective bonding
- Prepare repair polymer modified mortar (PMM). Select fine clean washed and dried sand for repair mortar. Use mechanical mixer for better consistency. High Strength Microconcrete can be used instead of PMM
- Apply this mortar when the bond coat is tacky at a thickness up to 15-20 mm. Build up the required thickness in subsequent layers of 15-20 mm each over the final coat. Final layer can be finished with trowel
