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COLUMN STRENGTHENING PROCESS CONCRETE JACKETING Ø        Involves addition of a thick layer of Reinforced Concrete(RC) in the form of a jacket, using longitudinal reinforcement and transverse ties. Ø        Additional concrete and reinforcement contribute to strength increase. Ø        Minimum allowable thickness of jacket = 100 mm. Ø        The sizes of the sections are increased and the free available usable space becomes less. Ø         Huge dead mass is added. Ø         The stiffness of the system is highly increased. Ø          Requires adequate doweling  to the existing column. Ø          Longitudinal bars need to be anchored to the foundation and should be continuous through the slab. Ø          Requires drilling of holes in existing column, slab, beams...

REPAIR TECHNIQUE ON CRACKS  PRESSURE INJECTION EPOXY GROUTING SLAB REPAIR Procedure for Epoxy Injection Grouting in Concrete Structures: Surface preparation is the first step in repair of cracks in concrete. The area to be epoxy grouted should be made free from oil, grease, dust and all loose and unsound materials. Then cracks in concrete is cut open into a ‘V’ groove about 10mm deep by mechanical or manual method. Loose materials are removed by using compressed air. The ‘V’ groove cut is fully sealed with epoxy mortar at least one day in advance before epoxy injection. Nails are driven into the cracks at 15 cm to 50cm intervals along the crack. Holes of 7 – 10 mm diameter is then drilled along the cracks and copper or aluminium or polythene pipe pieces of 6 – 9 mm diameter is fixed as grout nipples around the nails and allowed to rest on them. Epoxy formulation is injected from the bottom most pipe. All other pipes, except the adjacent ones are blocked ...