Fresh and mechanical properties of self-compacting concrete using steel and abaca fibers in mono and hybrid modes
摘要
This research presents experimental investigations on developing sustainable self-compacting concrete (SCC) using industrial waste, metallic, and natural fibers in blended forms. To achieve this, an SCC of M30 grade was prepared using ground granulated blast furnace slag (GGBS), an industrial waste, at a constant replacement of cement by 30%. The metallic fiber, namely steel fibers, was incorporated in 0.25%, 0.5%, 0.75%, 1%, 1.5% and 2% as mono-fibers in the volume fractions while preparing SCC. The utilization of natural fiber, namely abaca fibers, was incorporated at 0.25%, 0.50%, and 0.75% in the volume fractions of concrete. Further, the effect of fibers in hybrid form has also been studied. Totally, fifteen combinations of SCC mixes were made with different proportions of steel, abaca, and hybrid mode combinations. Since SCC is a flowable concrete, the effect of fibers in mono and hybrid forms has been investigated through various fresh property tests such as the slump flow test, J-ring test, and V-funnel test. In order to ensure the strength in the hardened state, the mechanical tests, such as the compressive strength test and the impact test, were performed. The fresh properties test results indicated that mixes with steel fiber possessed better flow properties compared to abaca fibers and hybrid modes. In the mechanical properties test, 1.5% of steel fiber and 0.25% of abaca fiber in mono fiber mode have obtained the highest compressive strength at 28 days of testing. When compared to the hybrid mode of fiber additions with mono forms, 1.5% of mono steel fiber additions surpassed the 0.25% of abaca in mono form and hybrid mode of fiber additions. From the impact test results, it was inferred that the 1% of mono steel fiber additions showed the highest impact ultimate energy than mono abaca and hybrid mode combinations.