Size effect of steel fiber–reinforced concrete cylinders under compressive fatigue loading: Influence of the mesostructure

• Small cylinders endure longer lives under fatigue loading. The maximum pore size is larger in taller cylinders, which conditions their lower performance. A wall effect induces an inverse monotonic static effect. Cylinders fewer cycles than cubes of comparable size. law Sparks and Menzies insensitive to cylinder This study deals with the influence fiber concrete mesostructure on compressive For this purpose, three series cylindrical specimens steel fiber–reinforced were fabricated. Before testing, all scanned main morphological, orientation, distribution parameters pores fibers checked. images reveal that, near cylinders’ walls, porosity that cores even for large sizes. Additionally, are more vulnerable loading, resulting a reduction life.