Correlation between rebound hammer number and mechanical properties of steel fibre.

What is it about?

The experimental investigation was conducted to assess the impact of steel fibre reinforced granite powder blended pavement quality concrete (PQC) with reference to destructive and non-destructive tests of concrete. M35 grade of concrete was used in this study. The quantity of granite powder (GP) mixed in this concrete was fixed as 10% from the results obtained in an earlier studies. In order to improve the performance of PQC, the steel fibre was added in the concrete at 0.25, 0.5, 0.75, 1.0, 1.25 and 1.5% by volume of concrete. The performance of hardened concrete was examined in terms of compressive strength, rebound hammer test and flexural strength. The substitution of granite powder improves the strength performance of concrete marginally. The results showed that the addition of steel fibre causes the reduction of slump value but improve the mechanical properties up to 1.1% addition of fibres in concrete. The correlation between rebound hammer number and compressive strength / flexural strength of granite powder blended PQC was developed.

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Why is it important?

The substitution of supplementary cementitious materials is an inevitable practice for developing special concrete while considering durability as an important criteria [1]. One such special concrete is pavement quality concrete (PQC) which is performing as surface layer of rigid pavement. Due to the extended development of urban infrastructure, PQC are being widely used in India and are subjected to variable moving loads with different magnitude.

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