Concrete behaviour in direct tension tests at high strain-rates

Direct tensile tests on cubic concrete specimens of 60 mm side have been performed at strain-rates from 1s^-1 to 10s^-1 by means of a modified Hopkinson bar. The results of 26 such high-strain-rate tests on two concrete types, with 5 and 10 mm maximum aggregate size, are presented. As reference for these dynamic tests, a series of 14 static tests with specimens of the same geometry have also been carried out. The experiments have shown a significant increase of the tensile strength, failure strain, elastic modulus and fracture energy as the strain-rates increase. The dynamic results obtained have been compared with the data and the formulations present in the literature, whose validity has been critically assessed. Deviations or knowledge gaps have been identified, which confirm the need of generating new data in order to develop more accurate formulae able to predict the evolution of the mechanical properties with increasing strain-rate.

CADONI Ezio;  SOLOMOS George;  ALBERTINI Carlo; 

2013-08-12

ICE PUBL

JRC77350

0024-9831,   

https://publications.jrc.ec.europa.eu/repository/handle/JRC77350,   

10.1680/macr.12.00175,