EFFECT ON DRYING SHRINKAGE EFFECT OF CONCRETE DUE TO THE ADDITION OF CARBON FIBRES AND PARTIAL REPLACEMENT OF CEMENT AND FINE AGGREGATES

Kumuda V, Veerendra Kumar K N

Abstract: The present study aims in checking the drying shrinkage effect of the concrete in which the cement and fine aggregates are replaced with admixtures like fly ash and bottom ash with a constant percentage of 0.5% carbon fibers to the relative volume of concrete respectively. In this investigation, concrete of M25 grade is used. Fly ash is partial replaced for cement at 0%, 10%, 20%, 30%, 40%, 50% and bottom ash is partial replaced for fine aggregates at 0%, 10%, 20%, 30%, 40%, 50% with addition 0.5% of carbon fibers to the relative volume of concrete. The drying shrinkage effect of the carbon fibre reinforced concrete (CFRC) is studied using a specimen size of 75 X 75 X 150 mm cubes. After 28 days and 56 days of curing, the specimens are dried and tested in shrinkage measuring instrument. The result of CFRC is compared with the normal concrete having same water cement ratio (W/C). After obtaining the result the drying shrinkage is found to be higher in conventional concrete and it reduced with addition of fibres as they act as crack arrestors and also as replacement of cement and fine aggregates increases the drying shrinkage was found to be reduced as the shrinkage property depend on the factors such as size of aggregates, curing conditions and type of chemical admixtures being used.

Keywords: CFRC, W/C, Drying Shrinkage, Conventional concrete, Fly ash, Bottom ash

DOI: https://doi.org/10.15623/ijret.2017.0617007