We are cleaning the surface from dust; mortar splashes loose materials etc to get a sound concrete surface. Repairing of all cracks and honey combing with epoxy putty or rich cement sand mortar admixed with waterproofing admixture. In case of cement mortar repairing sealant treatment should start after 28 days of repairing. Expansion Joint Treatment Clean the joint with wire brush, nylon brush and air if possible. Filling polystyrene based back-up rod in the joint to hold the sealant.