Fresh and hardened-state properties of hybrid fiber-reinforced high-strength self-compacting cementitious composites

The main objective of this paper was to present the experimental and statistical results on durability and engineering material properties of self-compacting cementitious composites (ScCC) containing blended fibers and class-F fly ash (FFA). Fifteen mixtures were prepared to determine the effect of blended micro steel (MS) polyvinyl alcohol (PVA) fibers and investigated under the capillary water absorption, J-ring, flexural, tensile, compressive, and impact tests. The results indicated an enhancement in the mechanical characteristics of ScCC containing FFA by the addition of fiber, which was appreciably dependent on the use of single or blended fibers, fiber types, and fibers' contents. It was found that the single/hybrid fibers and frictional pullout performance significantly affect the post-peak flexural behavior and number of post-first-crack blows. In general, the blended PVA-MS fiber-reinforced ScCC specimens have better behavior than the reference specimen. Also, the analytical analysis and probabilistic quantification were performed to study the variability of hardened properties.

Automated summary

This study presents experimental and statistical results on the durability and material properties of self-compacting cementitious composites containing fibers and fly ash. The addition of fibers enhances the mechanical characteristics of the composites, with single/hybrid fibers and frictional pullout performance significantly affecting material behavior. Overall, specimens reinforced with blended fibers show better performance than reference specimens, and analytical analysis was performed to study the variability of hardened properties.