BONTRUP helps to protects coasts and shores against rising sea levels and heavier storms by providing a wide range of base and aggregate materials and rock armour grades for use in revetments, dikes, jetties and groynes.
The rock grades can be standard EN13383 light, coarse and heavy gradings, custom-made products or produced in accordance with other standards such as ASTM, BS, GOST, etc.
Our quarrying, engineering and logistical expertise allows an integral approach resulting in pragmatic solutions. We focus on the functional requirements to be achieved in the end and try to find the best match with available products and reliable logistical solutions.
For example, our Widegrade® material can be used as a stable granular filter between fine sand and larger armour rock, providing a simple and natural alternative for synthetic PP/PE geotextiles. It has high stability and can easily stand attacks by waves and reduce their impact on the coast.
With our international network of quarries, we can offer a wide range of material grades and types and provide the best solution for each application. For instance, due to their hardness and shape, granitic rocks are often used as large armour rock. Limestone aggregates are very suitable for use in concrete, whereas hard, dense limestone is also used in marine engineering providing a distinct appearance. Bremanger Bestone® has excellent strength and abrasion properties for use in nearly all civil and marine structures. In some occasions certain rock types (e.g., high density gabbro) may not be desirable, whereas in other applications it is a perfect match.
