Physical and mechanical properties of river stone as coarse aggregate for concrete production

In this research, the physical and mechanical properties of river stone as coarse aggregate for concrete production was investigated. This will provide alternative construction materials to the society especially in areas where there is unavailability of good crushed aggregates. Physical and mechanical tests was conducted on samples of river stone which included; specific gravity of aggregates, bulk density of aggregates, water absorption of aggregates, crushing value of aggregates and grading of aggregates. Results obtained show that the specific gravity value for the sampled river stone is 2.6. The loose bulk density of the river stone is 1474kg/m3. Water absorptions test conducted on the aggregates gave a value of 0.9%. Crushing value of the river stone aggregates was obtained as 34.5. It is recommended that the inclusion of river stone as coarse aggregates in normal weight concrete production be encouraged especially in areas where quality coarse aggregates for normal weight concrete production is scarce and expensive.Keywords: River Stone, Specific Gravity, Bulk Density, Coarse Aggregate