Abstract
The promise of fibre-reinforced cementitious composites for dynamic loading application stems from their observed good response under static loading mainly due to fibre contribution. An experimental research aimed at contributing to the understanding of the behaviour of advanced fibre-reinforced cementitious composites subjected to low and high strain rates was carried out underlining the influence of fibres. The material behaviour was investigated at three strain rates (0.1, 1, and 150 s −1 ) and the tests results were compared with their static behaviour. Tests at intermediate strain rates (0.1–1 s −1 ) were carried out by means of a hydro-pneumatic machine (HPM), while high strain rates (150 s −1 ) were investigated by exploiting a modified Hopkinson bar (MHB). Particular attention has been placed on the influence of fibre and fibre dispersion on the dynamic behaviour of the materials: matrix, HPFRCC with random fibre distribution and aligned fibres were compared. The comparison between static and dynamic tests highlighted several relevant aspects regarding the influence of fibres on the peak strength and post-peak behaviour at high strain rates.
Highlights
The mechanical behaviour of fibre-reinforced cementitious composites when subjected to impact or blast still has many aspects requiring further studies [1], with specific reference to large and socially-sensitive structures, as sheltering structures, high-rise buildings, bridges, offshore platforms, pipelines, gasification reactors, secondary containment shells for nuclear power plants, and tunnels
A peak strength increase of about 40% can be pointed out comparing the results obtained for the high performance composite (HPCC)
The behaviour of High Performance Fibre Reinforced Cementitious Composites (HPFRCC) and HPCC materials when subjected to different strain rates was investigated
Summary
The mechanical behaviour of fibre-reinforced cementitious composites when subjected to impact or blast still has many aspects requiring further studies [1], with specific reference to large and socially-sensitive structures, as sheltering structures, high-rise buildings, bridges, offshore platforms, pipelines, gasification reactors, secondary containment shells for nuclear power plants, and tunnels. Caverzan et al [10] have pointed out that fibers increase the peak strength in static, favoring the stable crack propagation, but when the strain rate is increased, fiber influence on the stable crack propagation phenomena reduces: at high strain rates the peak strength ratio between HPFRCC and HPCC decreases. Starting from this observation, in this work the fiber role is investigated at different strain rates comparing the results obtained for a plain and fiber reinforced HPCC. HPFRCC-R had a random fibre distribution and no preference fibre direction can be highlighted
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