Behavior of HP-SFRC with High Content of Steel Fibers after Exposure to Freeze-Thaw Cycles with Deicing Salt

摘要

High Performance Steel Fiber Reinforced Concrete (HP-SFRC) with high content of steel fibers has been investigated in fresh and hardens state. Consistence, air content and initial setting time of the fresh HP-SFRC were determined. In the paper, brief discussions of test results of compressive strength, flexural tensile strengths (obtained by three-point bending test), and split strengths (obtained by wedge split test) and permeability to water are given. Freeze – thaw resistance with deicing salt has been investigated up to 355 cycles. After that, behavior of the HP-SFRC lamellas, which were sawn from the plates exposed to freeze-thaw cycles, has been investigated. Three-point bending configuration was used to obtain first-peak strength f_1, peak strength f_p, residual strengths f_(rδ) up to the selected deflections (δ = 1, 2 and 3 mm), and total area under the load-deflection diagram T up to those deflections. The obtained results show that damages of the surface of HP-SFRC plates, as well as corrosion of steel fibers after long-term freeze-thaw cyclizing are so small that they do not affect the behavior of HP-SFRC under bending loading.