Effects of partial replacement of fine aggregates with crumb rubber on skid resistance and mechanical properties of cement concrete pavements

This study analyses the skid resistance performance of rigid pavements by partially replacing fine aggregates with crumb rubber percentages in a laboratory setting. To achieve this objective, British pendulum testing is performed to examine the effects of crumb rubber on skid resistance in dry and wet conditions. In addition, mechanical properties such as compressive strength, tensile strength, and slump, are also investigated. Furthermore, a thorough literature review reveals that the relationship of skid resistance with mechanical properties is relatively scant, and a regression model is also missing that can predict skid resistance through these properties. To this end, this study presents empirical correlations, ascertaining a one-to-one relationship between skid resistance with mechanical properties. As different dosages of crumb rubber are used, this study also provides some guidelines on appropriate dosage of crumb rubber, keeping all the performance parameters in view. Findings of this study suggest that skid resistance is significantly enhanced when crumb rubber is added; however, it compromises the strength performance of rigid pavements. Therefore, an appropriate dosage of crumb rubber that balances them is required. Finally, correlations and models are evaluated and discussed in detail.