Effect of flexural impact on freeze–thaw and deicing salt resistance of steel fiber reinforced concrete

The flexural impact performance, freeze–thaw and deicing salt resistance of steel fiber reinforced concrete (SFRC) were investigated in this paper. Pre-applied flexural impact tests were carried out and followed by 100 and 200 freeze–thaw cycles in 3 % NaCl solution. The dynamic elastic modulus and the weight loss of SFRC were measured, respectively. The weight loss measured in this paper is connected to a combination of scaling and absorption. Finally, all specimens were subjected to flexural impact tests again until one part of the specimens contacted the lifting pallet. The final numbers of flexural impact tests were recorded. The results show that the pre-applied flexural impact tests substantially decrease the dynamic elastic modulus of SFRC and increase the weight loss of SFRC under the action of freeze–thaw cycles in 3 % NaCl solution. The pre-applied flexural impact tests have an effect on the final number of flexural impact test of SFRC with 100 freeze–thaw cycles in 3 % NaCl solution. However, for SFRC subjected to 200 freeze–thaw cycles, the final impact number decreases slightly and then slightly increases. The severe combination of flexural impact and freeze–thaw exposure indicates that the two forms of deterioration affect the accumulated damage in a complex way.