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- W2188862358 abstract "Ultra High Performance Concrete (UHPC), which is a type of improved high strength concrete, is a recent development in concrete technology. The stress-strain behaviour of UHPC under compression is of considerable interest in the design of UHPC members because the material is intrinsically strong in compression, and accurate prediction of their structural behaviour. An attempt has been made in the present study to determine the complete stress-strain curves from uniaxial compression tests and to develop stress-strain models representing this behaviour. The effect of material composition on the stress-strain behaviour and the consequent variation in the model parameters and the compression toughness are presented in the paper. The highest cylinder compressive strength of 171.3 MPa and elastic modulus of 44.8 GPa were recorded for 2% 13 mm fibers. The optimum fiber content was found to be 3% of 6mm or 2% of 13mm. A new measure of compression toughness known as MTI (modified toughness index) is proposed and it is found to range from 2.64 to 4.65 for UHPC mixes. It appears to be a better measure of the reinforcing action of fibers and their crack bridging action than some of the earlier measures proposed by other investigators. For modelling of the complete stress-strain curve, several stress-strain behavioural models were examined and a modification of model adopted by earlier by Voo et al [2003] was found to provide the best fit for all the mixes and provided very good agreement with the experimental results." @default.
- W2188862358 created "2016-06-24" @default.
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- W2188862358 date "2014-01-01" @default.
- W2188862358 modified "2023-09-27" @default.
- W2188862358 title "STRESS STRAIN BEHAVIOUR OF ULTRA HIGH PERFORMANCE CONCRETE UNDER UNIAXIAL COMPRESSION" @default.
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