Static and dynamic mechanical behaviour of ECO-RPC

摘要

Ecological reactive powder concrete (ECO-RPC) with small sized and different volume fraction steel fibers was prepared by substitution of ultra-fine industrial waste powder for 50% to 60% cement by weight and replacement of ground fine quartz sand with natural fine aggregate. The effect of steel fiber volume fraction and curing ages on the static mechanical behaviour of ECO-RPC was studied. Using the split Hopkinson pressure bar technique, the dynamic mechanical behaviour of ECO-RPC was investigated under different strain rates. The results show that the static mechanical behaviour of ECO-RPC increases with the increase of steel fiber volume fraction and curing ages. The type of ECO-RPC with the substitution of 25% ultra-fine slag, 25% ultra-fine fly ash and 10% silica fume is better than the others with compressive strength, flexural strength, and fracture energy more than 200 MPa, 60 MPa and 30 kJ/m~2, respectively. ECO-RPC has excellent strain rate stiffening effects under dynamic load. Its peak stress, peak strain and the area under strain-stress curve increase with the increase of strain rate. Its fracture pattern changes from brittleness to toughness under high strain rates.