AN EXPERIMENTAL STUDY ON FLEXURAL BEHAVIOUR OF DAMAGED REINFORCED HPC BEAMS STRENGTHENED WITH CFRP WRAPPING

Rapid development of Infrastructure is witnessed throughout the world. Many structures deteriorate or become unstable due to various reasons. Occurrence of natural calamities may also lead to one of the major problem. In many cases the past constructions reveal certain up gradations is necessary in three conditions: a) The structure is inadequately designed for the loading conditions. b) Structures that are found deficient under seismic conditions. c) The structure is damaged and requires rehabilitation. HPC has undergone many growths based on the persuade of cement type, type and proportions of mineral admixtures, type of superplasticizer and the mineralogical composition of coarse and fine aggregates. The constituent materials of HPC depend on the desired characteristics and the availability of suitable local economic alternatives. Cubes and cylinders were made with different percentage replacement of cement with fly ash and silica fume and strength tests such as cube compressive strength at 7th and 28th days and split tensile strength test at 28th days was performed. The test results showed that replacement of cement with combination of fly ash and silica fume the 7.5 % & 15% respectively gave better strength when compared to that of the normal conventional concrete. In this experimental study was carried out to study the flexural behavior of beams made out of high performance concrete. The beams were made from concrete having compressive strength of 60 Mpa. An experimental investigation was carried out to understand the structural behavior of reinforced HPC beams of size 2000mm (length) x 100mm (width) x 200mm (depth). The six beams were casted and tested under two points loading till their 70% load and it was strengthened by means of Carbon Fiber Reinforced Polymer (CFRP) sheets and that the strength of the distressed beam were examined. Maximum ultimate load carrying capacity and the least deflection is obtained for the mix prepared by partial replacement of cement with 7.5% silica fume & 15 % Fly ash.