Specific weight of gravel

The specific gravity of ballast, apart from the grain size and the resulting cavities between the grains, also arises from the initial density of the rock or material. The bandwidth ranges from one to more than two tons per cubic meter.

Weight of the starting building material

The specific gravity of gravel varies according to grain size and grain fractions. The range of possible densities is determined by the specific gravity of the starting material. On average, about one tonne of solid building material densities can be deducted to obtain the mean value of the corresponding ballast weight. The following building materials frequently used in gravel production have these initial densities:

  • Granite 2800 kg / m³
  • Limestone 2700-2900 kg / m³
  • Reinforced concrete 2500 kg / m³
  • Gravel concrete 2300 kg / m³
  • Clinker bricks 2000 kg / m³
  • Solid brick 1800 kg / m³

Moisture and grain size

Stone gravel is calculated with a specific weight of 1.8 tonnes per cubic meter. When calculating the density of gravel and the resulting specific gravity, the state of the ballast is crucial. The smaller the gravel fraction of gravel, the greater the impact of moisture and moisture on specific gravity.

Small grains give the water more surfaces to "hold on". Obviously, this is at Bruchsand, which "soaked" with water, but the water "hangs" only by its adhesive forces between the small grains. Wet gravel can weigh up to 400 kilograms more than dry.

As a basic condition for the calculation of the ballast and its specific weight loosely poured dry material is presupposed.

Tips & Tricks

When you buy gravel, pay attention to the storage location. Often, upper layers are dry and increasingly wet, the more gravel is removed. In this case, as the amount increases, more and more pay for the same specific weight when the purchase price is calculated in weight.

Video Board: Specific Gravity & Water Absorption of Coarse Aggregate