Iron-silicate products in embankment construction

Our waterway and hydraulic construction stone is predestined as riprap in embankment construction on account of its very good physical properties. The high apparent density under buoyancy force has great advantages over other construction materials. Furthermore, the cube shape, the surface roughness and the grain distribution play an important role for the structure and stability of bank slopes.

The use of iron-silicate stone can in many cases optimally fulfil demands made by high tides, wave and wind exposure and ice drifts both from the technical and economic aspects.

Clear advantages result in slope construction

  • For new constructions or redevelopment: smaller layers are possible which also result in considerable savings in soil excavation work.
  • In the maintenance of waterways: the use of smaller stones has significant advantages as regards interlocking, stability and adaptation to the existing bank protection.

Areas of application are

  • Riprap for bank slopes, groynes and longitudinal dykes
  • Erosion-stable cover for exposed underwater bank slopes
  • Securing embankment batter
  • Overflow protection at flood control facilities

It is worthwhile for construction designers with concrete parameters to compare hydraulic construction stone made of iron-silicate stone with other types of rock before reaching a decision.

Example of calculation for material requirements:

The use of iron-silicate hydraulic construction stone results in considerable weight differences compared with other rock with average apparent density.

Dry bulk density for

  • Iron-silicate stone: ~ 3.65 t/m
  • Rock: ~ 2.65 t/m
  • Difference: ca. 40%

An embankment of iron-silicate hydraulic construction stone has a difference of about 60% in upwelling conditions.

This technical advantage enables either a less thick riprap layer or if the riprap layer thickness has been stipulated, high mass per unit area under buoyancy force. In some cases savings in soil excavation can also be taken into account.

Basically, when using iron-silicate stone, the design engineer can arrange the structure with smaller types of stone and lower structure thickness.

Bank slopes of 1:2 to 1:1.5 are possible. Generally the stone is applied loosely without grouting.

Further information ...

Table of mass per unit area embankment construction