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1 Engineering Transactions

1 2010

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Mechanical response of HPFRCC in tension and compression at high strain rate and high temperature

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Cadoni E. , Bragov A. M. , Caverzan A. , Prisco di M. , Konstantinov A. , Lomunov A.

tom Vol. 58, iss. 3/4

139-151

The mechanical response of High Performance Fibre-Reinforced Cementitious Composite (HPFRCC) has been analyzed at high strain rates and high temperature. Two experimental devices have been used for compression and tension tests: the traditional Split Hopkinson Pressure Bar for compression and the JRC-Split Hopkinson Tension Bar for tension. The HPFRCC was thermally damaged at 3 temperatures (200 C, 400 C and 600 C) in order to analyze the dynamic behaviour of this material when explosions and fires took place in a tunnel. Results show that significant peak strength increases both in tension and in compression. The post-peak strength in tension depends on the thermal damage of the material. Its strainrate sensitivity and thermal damage have been illustrated by means of a Dynamic Increase Factor. These results show that it is necessary to implement new expression of the DIF for the HPFRCC, therefore more and more accurate and experimental studies using Kolsky-Hopkinson Bar methods are needful.