STRENGTHENING OF DAMAGED CONCRETE STRUCTURES

Abstract

The repair and strengthening of the existing concrete structures has been a problem as important for civil efgineers as the construction of the same. The concrete structures need repairing due to damages experienced arising out of many reasons such as improper design, faulty construction etc. The strengthening may be required for the structures which have been under designed or incorrectly designed. The strengthening could be needed either after the structure has been loaded and got damaged or before that. Various materials and techniques. of repair and strengthening have been tried till now In this dissertation work, the comparative usefullness of cement si.UYr7 and epoxy mortar in strengthening of undamaged and damaged reinforced concrete beams has been investigated. The usefullnp;Sc of epoxy grout in sealing the cracks in the damaged beams has also been investigated. The filling of cracks has been done by gravity method as well-as using gun. The results have been shown in the form of figures-tables and photoplates. The load v/s deflection behaviour of the undamaged and damaged beams strengthed by five methods have been studied to see the behaviour of beam, compare the improvement in experimental ultimate loads of beams strengthened by the five methods, compare experimental uiti t load with the experimental load corresponding to Span/250 deflection at mid span as permitted by IS.456-1978. The failure crack pattern of the repaired beam has been compared with cracks of damaged beam which was repaired.