Tensile behaviour of FRC under high strain-rate

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Title: Tensile behaviour of FRC under high strain-rate

Author(s): Ezio Cadoni, Alberto Meda, Giovanni Plizzari

Publication: RILEM

Volume: 42

Issue: 9

Appears on pages(s): 1283-1294

Keywords: FRC, High strain-rate, Tensile tests, Dynamic tests, High performance concrete

Date: 10/14/2009

Abstract:
This paper presents experimental results on two types of concrete reinforced with steel and polyvinyl-alcohol PVA fibres subjected to dynamic tensile loading. The tests were carried out by using a Modified Hopkinson Bar apparatus on fibre reinforced concrete notched-specimens under three different strain-rates 50, 100, and 200 s-1. From the experiments it was found that there is a significant enhancement in tensile strength with increasing strain-rates. The dynamic tests on steel FRC with the smaller loading rate 50 s-1 showed a strength similar to the one measured from static tests; however, for increasing loading rates, a remarkable decrease of post-peak strength and ductility occurs. In specimens with PVA fibres, an enhancement of the tensile strength was also observed and a significant reduction of fracture energy and ultimate deformation occurred. Some experimental aspects are also discussed as the specimen shape, its dimension, the loading rate as well as the different post-peak behaviour from static and This paper presents experimental results on two types of concrete reinforced with steel and polyvinyl-alcohol PVA fibres subjected to dynamic tensile loading. The tests were carried out by using a Modified Hopkinson Bar apparatus on fibre reinforced concrete notched-specimens under three different strain-rates 50, 100, and 200 s-1. From the experiments it was found that there is a significant enhancement in tensile strength with increasing strain-rates. The dynamic tests on steel FRC with the smaller loading rate 50 s-1 showed a strength similar to the one measured from static tests; however, for increasing loading rates, a remarkable decrease of post-peak strength and ductility occurs. In specimens with PVA fibres, an enhancement of the tensile strength was also observed and a significant reduction of fracture energy and ultimate deformation occurred. Some experimental aspects are also discussed as the specimen shape, its dimension, the loading rate as well as the different post-peak behaviour from static and dynamic tests.


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