The ASTM C128 standard provides the official methodology for determining the specific gravity and absorption of fine aggregates used in concrete and asphalt mixtures. Understanding these physical properties is essential for accurate mix design, as they influence the water-cement ratio and the overall volume of the batch. Understanding Specific Gravity
$$G_sb = \fracDB + D - C$$ Where:
For G~2.62, SSD mass 500 g → displaced water = 500/2.62 = 191 mL. If pycnometer volume = 450 mL, then water added C = 450 – 191 = 259 mL. Then Bulk SSD = 500/(450-259) = 500/191 = 2.62 ✅. The ASTM C128 standard provides the official methodology