Early age strain behavior and tensile softening properties of High Performance Fiber Reinforced Mortar with a strength class around 100 N/mm²

Abstract

This paper describes the modeling of early age strain behavior of high performance fiber reinforced mortar with high compressive strength of about 100 N/mm², based on experimental results and taking into account the effect by both adding expansive admixtures and the volume content of short steel fibers. The effect of early-age strain on the tension softening properties of HPFRM in the hardened state was found to be small except in the case of excess expansion caused by high content of expansive admixture. On the other hand, the volume content and length of short steel fibers affected these properties to a greater extent in terms of tensile residual stress and effective fracture energy.