Limit 3% for uncrushed limit 15% for crushed sand: 4: Silt and Organic impurities: Present (Retard the setting Compressive Strength) Absent: Limit of 5% for Uncrushed 2% for Crushed sand: 5: Specific gravity: – : – : May vary: 6: Water absorption: 3%: 2 – 4%: Limit 2%: 7: Ability to hold surface moisture: Upto 7%: Upto 10% : 8: Grading zone(FM)