A Study on Properties of Hybrid Fiber Reinforced Self Compacting Concrete
10 Pages Posted: 20 Nov 2018
Date Written: October 28, 2018
SCC spreads homogenously due to its own weight, without any additional compaction energy and does not entrap air. The main characteristics of SCC in the fresh state are filling ability, passing ability and segregation resistance. Fibers have been produced with a wide range of materials, shapes and characteristics. They improve the performance (strength and toughness) of brittle cement-based materials by bridging cracks; transmitting stress across a crack and counteracting the crack growth. Fibers are added in SCC to get increased performance mainly in flexure, impact and also in compressive strength. Fibers can affect the flow ability and passing ability through congested reinforcement, which are main aspects when SCC is considered.It is proposed to study the flow and strength properties of the Fiber reinforced self compacting concrete and hybrid fiber reinforced self compacting concrete in comparison with control self compacting concrete. The steel fibers used in this study are crimped steel fibers of size 0.45mm diameter x 12.5mm length (aspect ratio 27.7) and carbon fibers of size 0.2mm diameter x 12 mm length (aspect ratio 60)are added to the SCC mix at various percentages by weight of cement i.e 3%,4% and 5%. Mixes are designated as SCC, SCC3S, SCC4S, SCC5S, SCC3S1C, SCC4S1C, SCC5S1C. Results show that the flow properties are adversely affected. Beyond 4% addition of steel fibers FRSCC mix failed to achieve L-box blocking ratio acceptance limits. 1% carbon fibers added in addition to the above mentioned steel fiber percentages. Mixes are designated as SCC3S1C, SCC3S1C, and SCC5S1C. Compressive strength, Split tensile strength, Flexural strength of all the fiber reinforced SCC mixes is increased compared to control mix SCC0.
Keywords: Self compacting concrete (SCC),Crimped steel fibers,Carbon fibers
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