bulk density of crushed granite
The bulk density of crushed granite is an essential parameter in construction and landscaping projects. This measurement indicates the weight of the material per unit volume, typically expressed in kilograms per cubic meter (kg/m³) or pounds per cubic foot (lb/ft³). Understanding the bulk density helps in estimating material requirements, calculating load-bearing capacities, and ensuring proper compaction for stability.
Crushed granite is a popular choice for driveways, pathways, and drainage systems due to its durability and natural aesthetic. The bulk density can vary depending on factors such as particle size, moisture content, and compaction level. Generally, the bulk density of crushed granite ranges between 1,500 to 1,700 kg/m³ (94 to 106 lb/ft³) for loose-fill conditions. When compacted, the density increases to approximately 1,800 to 2,100 kg/m³ (112 to 131 lb/ft³).
Particle size plays a significant role in determining bulk density. Finer crushed granite particles tend to pack more tightly, resulting in higher densities. Coarser aggregates have more voids between particles, leading to lower bulk densities. For example:
- 5mm to 10mm crushed granite: Bulk density of around 1,600 kg/m³ (100 lb/ft³) when loose.
- 20mm to 40mm crushed granite: Bulk density closer to 1,450 kg/m³ (90 lb/ft³) in loose condition.
Moisture content also affects bulk density. Wet crushed granite may appear denser due to water filling voids between particles. However, excessive moisture can lead to settling over time. Proper compaction techniques ensure optimal density and long-term stability.
In construction applications like road bases or concrete aggregates, achieving the correct bulk density is crucial for structural integrity. Engineers often conduct laboratory tests or field measurements using standardized methods such as ASTM C29 or AASHTO T19.
For landscaping purposes like decorative gravel or garden pathways, understanding bulk density helps estimate material quantities accurately. A cubic meter of loose crushed granite weighing 1,600 kg will cover approximately 10 square meters at a depth of 50mm.
In summary:
- Loose-fill bulk density: 1,500–1,700 kg/m³
- Compacted bulk density: 1,800–2,100 kg/m³
- Influencing factors: Particle size distribution and compaction effort
By considering these factors when working with crushed granite ensures efficient project planning and performance optimization across various applications from civil engineering projects like