Impact and dynamic resistance of SFRCC modified by varied superplasticizers

The paper presents results of examinations of steel fiber reinforced cement composites (SFRCC) modified by superplasticizers based on different chemical substances. The described SFRCC were made on the basis of fine aggregate cement matrix modified by steel fibers of an aspect ratio l/d = 50. Fine aggregate matrix composed of waste aggregate (obtained during hydroclassification) was modified by an addition from 0% to 2.8% (by volume) of hooked steel fibers and 1% of superplasticizer. After establishing basic parameters of fresh mix and hardened fiber reinforced composites, the main tests were a drop-weight test of the SFRCC plates and dynamic harmonic loading of beams. Results achieved this way allowed to specify the influence of the specific superplasticizer on the behaviour of SFRCC subjected to a dynamic force.