Rheological and Tribological Behavior of Cementitious Materials Incorporating Recycled Concrete Sand and Quarry Waste Sand

Abstract:

This study evaluates the impact of replacing natural sand (NS) with quarry waste sand (QWS) or recycled concrete sand (RCS) at varying substitution rates (0%, 25%, 50%, 75%, and 100%). The analyzed properties include Abrams cone slump, superplasticizer demand (SP), rheological and tribological parameters, mechanical strength, capillary water absorption, and shrinkage. The results show that QWS-based concrete exhibits better workability and requires less superplasticizer, whereas RCS-based concrete necessitates a higher admixture dosage. Both QWS sand and RCS sand significantly enhance the rheological and tribological properties of concrete Moreover, QWS sand provides higher mechanical strength than NS sand, with a strength gain of up to 16% at full replacement (100% QWS sand) at 90 days. Conversely, RCS sand reduces compressive strength by 28.6% at 28 days. and negatively affects porosity and capillary water absorption. However, these negative effects are mitigated when the RCS sand replacement is limited to 25%. QWS sand-based concrete exhibits slower shrinkage and reduced deformability compared to NS sand-based concrete. Predictive strength models were established based on experimental parameters, displaying a high correlation coefficient and a low root mean square error. Replacing NS sand with QWS sand or RCS sand reduced production costs, lowered carbon emissions, minimized waste, and preserved natural resources, offering a sustainable approach for concrete applications.

• Periodical: International Journal of Engineering Research in Africa (Volume 77)
• Pages: 155-179
• DOI: https://doi.org/10.4028/p-iMA9XI
• Online since: December 2025
• Authors: Manel Abdoun, Adem Ait Mohamed Amer, M'hamed Adjoudj*, Karim Ezziane, Manal Ezziane
• Keywords: Compressive Strength, Quarry Waste Sand, Recycled Concrete Sund, Rheology, Shrinkage, Sorptivity, Tribology

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