Dynamic Mechanical Properties of Steel Fiber-Reinforced Sulfoaluminate Cement Based Materials
WANG Junfeng
ZHANG Feng
LU Liulei
PEI Datian
ZHANG Zongyang
Abstract：The dynamic mechanical properties of steel fiber reinforced sulfoaluminate cement(SAC)mortars under different strain rates(80 s-1,135 s-1 and 180 s-1)were investigated by using ϕ120 separated Hopkinson pressure bar.Three-dimensional reconstruction and quantitative analysis of the microstructure of the material before and after deterioration were carried out by X-ray computed tomography(X-CT)technique.The results show that all the mortar samples show obvious strain rate effect,the addition of steel fiber significantly increases the peak stress of mortar specimen,and the optimal content is 0.3%-0.6%.With the increase of strain rate of SAC mortars,the peak stress,peak strain,elastic modulus and the area under stress-strain curve all increase.At high strain rate,the failure of mortar is mainly caused by sliding or pulling out of steel fiber.Although the steel fiber increases the porosity of SAC mortars,it formes a three-dimensional network structure,which effectively inhibites the propagation of main cracks,and the higher the steel fiber content is,the lower the proportion of micro-cracks is.
Keywords：sulfoaluminate cementsteel fiberstrain rate effectsplit Hopkinson pressure bar(SHPB)three-dimensional reconstruction
Publication Date：2026-02-28
Online Publishing Date：2026-04-07(First online date of this platform, not the publication date of the document)
Pages：11( 156-166 )