Effect of Hybrid Fibres on the Properties of High-Strength Ternary Blended Self-compacting Concrete Containing 100% Recycled Aggregates
摘要
Sustainability in construction industry especially concrete can be achieved though many ways and the prominent ones were use of supplementary cementitious materials as replacement to cement. Secondly, use of recycled aggregates obtained from construction and demolition waste as replacement to natural aggregates in concrete. The fibres (either single or multiple fibres) plays a significant role in improving the tensile properties of concrete. This present research looks at studying the fresh state and mechanical properties of recycled aggregate (RA)-infused hybrid fibre-reinforced ternary blended high-strength self-compacting concrete. The fly ash and micro silica were used as binary and ternary blends to the high-strength self-compacting concrete where cement was the primary blend. In this study, with an emphasis on the sustainability implications of using recycled resources, the study attempts to assess how hybrid fibres influence the mechanical characteristics of the recycled aggregate concrete mix. This experimental program consists of understanding the properties of high-strength self-compacting concrete with the addition of the steel fibres and hybrid (glass) fibres. The fresh state properties of self-compacting concrete were evaluated using the Slump flow, T500 Slump flow, J-ring, V-funnel and V-funnel T5min to ensure the self-compacting quality of the concrete mix. To investigate the impact of fibres on the characteristics of the concrete both in its fresh and hardened states, different amounts of steel and glass fibres were added to the mixture. Standard testing protocols are used to assess mechanical qualities, such as split tensile strength, flexural strength, and compressive strength. From the results it was concluded that the addition of 0.5% steel fibers along with 0.25% glass fibers had yielded the optimum results.