Effect of Micro Bubbles on Mechanical Properties of Fiber-Reinforced Concrete

Abstract

The present study aims at investigating the effect of the amount of metal fiber in concrete Type with C35 strength class on the concrete behavior’s indicators in terms of the various aspects of the strength thereof. The sample mixing design was set to achieve a strength degree of 350MPa, and the effect of this mixing plan was examined in two kinds of ordinary water and water containing microbubbles (MBs). The samples were also constructed at certain strength rates with an amount of fiber, 25kg/m³. The results indicated that the use of metal fiber considerably increases the impact resistance, duration of the first crack’s development and the final strength of the concrete. Moreover, the addition of such a type of fiber was found to have little effect on the concrete’s compressive strength. Also, the effect of an amount of steel fiber on the mechanical specifications in the seven and 28-day ages of the concrete was examined. Based on the findings, using a mixing design and changing the type of water increased the concrete’s slump when applying ordinary water compared to MBs-containing water. Considering the slump and the type of water used, the compressive strength increased in the 7- and 28-day ages for MBs-containing water mixing plan compared to the ordinary water application. The results indicated that the use of steel fiber also influences the rheological properties and brings about reductions in the concrete’s efficiency. Furthermore, the use of steel fiber for 1% of the concrete’s volume causes an increase in the compressive strength and concrete’s durability.