Complete splitting process of steel fiber reinforced concrete at intermediate strain rate

摘要

The complete splitting process of steel fiber reinforced concrete(SFRC)at intermediate strain rate was studied by experiment.The basic information of a self-developed SFRC dynamic test system matching with Instron 1342 materials testing machine was given,and the experiment principle and the loading mode of cubic split specimen were introduced.During the experiment,30 cubes of 150 mm×150 mm×150 mm and 36 cubes of 100 mm×100 mm×100 mm,designed and prepared according to C20 class SFRC with different volume fractions of steel fiber(0,1%,2%,3%,4%)were tested and analyzed.At the same time,the size effect of SFRC at intermediate strain rate was investigated.The experimental study indicates that SFRC size effect is not influenced by the loading speed or strain rate.When the steel fiber content increases from 0 to 4%,the splitting strength of SFRC increases from 100%to 261%,i.e.increasing by 161%compared with that of the common concrete.The loading rate increases from 1.33 kN/s to 80.00 kN/s,and the splitting tensile strength increases by 43.55%.