The price for gravel is advertised in tons or cubic meters

When gravel is used, the consumer is usually aware of the cubic meter of cubic meters to be filled. However, dealers and manufacturers often quote their prices in the weight unit tons. The specific weight of the required amount of ballast is calculated using the density.

The central underlying is the density

The typical price tags and indications of points of sale for gravel are prices per ton, per cubic meter or per BigBag. While simple multiplication is sufficient for room dimensions, the density must be taken into account for weight specifications.

In any case, the density of the ballast must be known in the uncompacted state and bulked. Most ballast grades range from 1.5 to 1.8 tonnes per cubic meter. The decisive factors are the sizes of the grains and the proportions of the grain groups.

Higher room prices and condition of the ballast

The prices quoted in room measurements tend to be higher than the tonne prices for the same gravel. This is partly due to the usually handed out BigBag and the more elaborate design work for room dimensions. A price comparison should be made in any case.

Each purchaser should take into account the state of the gravel to which the amount relates. The ton weight measure is based on dry loose poured ballast, which changes its volume by compression or moisture. Then the calculated specific weight can no longer be sufficient for the required volume.

For room dimensions, the re-compaction, which can deviate from the calculated volume requirement by up to 15 percent, must be taken into account. Appropriate tolerances should be added to the purchase.

The density of gravel depends on grain sizes and grain group proportions. Added to this is the specific weight of the different starting materials that make up the ballast. For a typical sorting with grain sizes of thirty to sixty millimeters, the following initial densities occur:

  • Granite otter about 1.35 tons / cubic meter
  • Basalt gravel approx. 1.18 t / m³
  • Gray wrecks and gneiss approx. 1.35 t / m³
  • Recycling gravel approx. 1.7 t / m³

Tips & Tricks

If you get gravel offered in BigBags, make sure you have the tax base. There are BigBags that take up the volume of one cubic meter and thus have the specific weight of the corresponding ballast. Other BigBags are smaller and designed to accommodate a ton of rock.

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