Experimental Investigation of Mechanical Durability and structural Properties of Crumb Rubber Concrete with Partial Replacement of Coarse Aggregate

Author

Mukesh, Rakesh Kumar

Abstract

This study examines the incorporation of recycled waste-tyre crumb rubber as a partial replacement for natural coarse aggregate in concrete. The source thesis reports experimental series with low rubber contents (0–3%) and a principal series containing 0%, 5%, 10%, 15%, 20% and 25% replacement. For the principal series, workability, 7- and 28-day compressive strength, splitting tensile strength, flexural response, acid-exposure strength, elevated-temperature response, sorptivity-related measurements and rapid chloride permeability were examined. Reinforced concrete beams were also assessed through load–deflection and cracking observations. The highest reported 28-day compressive strength was 35.56 MPa at 15% rubber replacement, compared with 32.89 MPa for the control (an increase of approximately 8.1%). At 20% and 25% replacement, the corresponding strengths declined to 24.08 and 17.60 MPa. Splitting tensile strength peaked at 3.04 MPa at 15% replacement, whereas the reported flexural strength peaked at 26.0 MPa at 10%. The acid-exposure tables generally showed the highest residual strengths at 15% rubber content, while rapid chloride permeability test charge increased as rubber content increased. These findings indicate that moderate crumb-rubber replacement can be promising in the reported mix system but entails a property-specific trade-off; further validation, especially of inconsistent source measurements, is needed before structural application.

Keywords

crumb rubber concrete; waste tyres; coarse aggregate replacement; compressive strength; acid resistance; RCPT; reinforced concrete beams.

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References

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Reference note: Bibliographic details above were adapted from the supplied thesis reference list and have not been independently checked against journal databases.

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