Performance of Self Compacting High Strength Fiber Reinforced Concrete (SCHSFRC)

Abstract

In this experimental study the changes on some mechanical properties of self compacting concrete specimen produced by silica fume, metakaolin, fly ash and steel fibers were investigated. The main objective of this is to obtain ductile Self Compacting High Strength Concrete (SCHSC) which flows under its own weight and homogeneity while completely filling any formwork and passing around congested reinforcement. The Self Compacting High Strength Concrete produced by using silica fume, metakaolin, fly ash, steel fibers and Polycarboxylatether base superplasticizer. Three types of steel fibers were used in the experiments and volume fractions of steel fiber were 0.5% to 4.0 %. Addition of silica fume, metakaolin and fly ash into the concrete were 2.5 %, 2.5 % and 10 % by weight of cement content respectively. Water/cement ratio was 0.29. Compressive strength and split tensile strength tests were made on hardened concrete specimens. Keywords-Compressive Strength, Fly Ash, High Strength Concrete (HSC), High Strength Fiber Reinforced Concrete (HSFRC), Metakaolin, Silica fume, Split Tensile Strength, Steel Fibres. I. Introduction Construction of durable concrete structures requires skilled labor for placing and compacting concrete. Self Compacting Concrete achieves this by its unique fresh state properties. In the plastic state, it flows under its own weight and homogeneity while completely filling any formwork and passing around congested reinforcement. In the hardened state, it equals or excels standard concrete with respect to strength and durability. This work is aimed to study the performance of steel fiber reinforced self compacting concrete as plain self compacting concrete is studied in depth but the fiber reinforced self compacting concrete is not studied to that extent. The main objective of this study is to optimize the Steel Fiber Reinforced Self Compacting High Strength Concrete (SFRSCHSC) in the hardened state. But the literature indicates that some studies are available on plain SCC but sufficient literature is not available on Steel Fiber Reinforced Self Compacting High Strength Concrete (SFRSCHSC) with different mineral admixtures. Hence an attempt is made in this work to study the mechanical properties of both plain Self Compacting High Strength Concrete (SCHSC) and SFRSCC.