Calculate bulk density, compaction ratios, and void fraction for dry, wet, and compacted sand.
Geotechnical breakdown of quartz grain solid mass versus pore air/water spaces.
Geotechnical breakdown of quartz grain solid mass versus pore air/water spaces.
Geotechnical and civil engineering principles for density and void fraction.
Ratio of total sand mass including moisture to total volume.
Relative density of solid silica quartz grains compared to pure water.
Volume fraction of air and water pores between compacted sand grains.
In geotechnical engineering and construction, sand density determines the load bearing capacity and compaction requirements.
Geotechnical questions on bulk density, void ratios, specific gravity, and soil phase relations.
The standard bulk density of dry silica construction sand is 1,600 kg/m³ (100 lbs/cu ft or 1.35 tons/yd³). Loose uncompacted sand measures around 1,400–1,500 kg/m³, while well-graded compacted sand can reach 1,750–2,100 kg/m³.
Dry loose density measures sand particles settled naturally with high pore space (void ratio ~0.65). Compacted density measures sand after mechanical vibration or roller compaction where void spaces collapse, increasing density by 15% to 25%.
Pure quartz silica sand has a standard specific gravity of Gs = 2.65. This dimensionless number indicates that solid quartz mineral grains are 2.65 times denser than pure water (2,650 kg/m³ vs 1,000 kg/m³).
Void Ratio (e = Vv / Vs) compares pore volume to solid volume, while Porosity (n = Vv / Total V) expresses pore space as a percentage. Lower void ratios signify denser packing, higher shear strength, and reduced settlement under building foundations.