Study of mechanical and durability properties of cementitious material-based FRC

The use of fibers in concrete to prevent fractures and extend the joint seam space of concrete slabs is becoming more common in concrete pavements and bridge structures. However, their durability behavior against acid rain attacks and chloride ion penetration has been less studied. The current paper investigates how Fiber-Reinforced Concrete (FRC) containing 15% cementitious material (Metakaolin and Pumice) instead of Portland cement performs with respect to acid attack by using microstructure studies. In addition, the chloride penetration under marine environments was studied by simulating the tidal and immersion conditions. Durability findings demonstrate that Metakaolin and Pumice have a considerable impact on enhancing chloride penetration in marine environments. However, concrete with cementitious material shows a negative performance against acid attacks. From this research, Computed Tomography (CT) scan analysis and microstructure results show a porous structure in specimens containing admixture, and the Ca/Si ratio is decreased significantly due to decalcification.