A concrete element when kept under sustained load presents progressive strain over time, which is associated with the creep phenomenon. The creep characteristic of high strength concrete assumes importance in the back drop of increase in prestressed concrete constructions. The loss in prestress and long term deflection depend on creep strain of high strength concrete. Even in case of RC columns, such creep induced deformations cause the stress increase in the reinforcement and may induce the material to undergo yielding. An experimental study is conducted to determine the time induced creep strain of high strength concrete using creep rig of capacity 1000 kN. Creep strains are measured at regular time intervals. M50 concrete is designed for mix proportions and its properties like compressive strength and elastic modulus are determined. Three cylindrical specimens are mounted in the creep rig and are subject to a sustained load which is about 30% of ultimate compressive strength. Measurement of creep strain over time period is done with the help of a digital D?Mec gauge. The data is mathematically modelled as a time dependent phenomenon using correlation technique. The modelling will helps to generate the creep strain over any given time duration. The goodness-of-fit of a model to the observed data is decided by the coefficient of correlation. The developed model will assist in predicting the time-dependent behaviour of RC columns in compression and uniaxial bending. Also it will help to obtain comprehensive creep deformation for the prediction of long term lateral deflection and instability. The model can be used in the development and calibration of a theoretical equation for the prediction of creep deflection and buckling under sustained load.
High Strength concrete, compressive strength, modulus of elasticity, creep
AMIT KUMAR MANGAL "Studies On Prevention Of Creep In Concrete" Iconic Research And Engineering Journals Volume 2 Issue 8 2019 Page 131-132
AMIT KUMAR MANGAL "Studies On Prevention Of Creep In Concrete" Iconic Research And Engineering Journals, 2(8)