Dynamic mechanical properties of basalt f iber reinforced concrete using a spl it Hopkinson pressure bar

The dynamic mechanical properties of the concrete reinforced with various volume f ractions of basalt fiber subjected to high strain rates were studied using split Hopkinson pressure bar ( SHPB) apparatus , and the
validity of experiment was analyzed. The test s reveal that the dynamic st rength and toughness of basalt fiber
reinforced concrete ( BFRC) are st rain rate dependent , the st rain rate effect can be expressed by linear
approximations , and the relationship between dynamic st rength increase factor and logarithm of average strain rate is approximately linear . The addition of 0. 1 % (volume f raction) basalt fiber result s in 26 % and 14 % increase of impact compressive strength and toughness , respectively. The addition of 0. 2 % and 0. 3 % basalt fiber result s in 25 % increase of impact compressive st rength and no significant superiority in toughness to plain concrete. During μSHPB test s , BFRC specimens begin to fail at 123. 3～239. 45 s , nearly constant st rain rates are obtained over 62% of test durations , and the average relative error of the st rain rate is 23 % , so the SHPB test result s of BFRC are credible.