+41 44 857 11 11

Void fillings

Products to choose from

Subsequent stabilisation

Pre-emptive stabilisation for subsequent demolition

Download

Application Flyer

Filling and stabilisation of voids in the subsoil

Void filling is used to specifically fill cavities in the subsoil, compact the ground and permanently restore the load-bearing capacity of foundations and floor slabs. Common causes of voids include washouts, settlement or structural changes in the ground.

 

Through targeted injection, voids are completely filled, the subsoil is compacted and load transfer is evenly redistributed into the ground. Depending on the system, expansion may also occur, stabilising adjacent loose zones.

 

RASCOR offers tailored injection solutions for void filling in building construction, civil engineering and infrastructure projects.

When is void filling used?
  • Voids beneath foundations or floor slabs
  • Washouts and loss of subsoil due to leakage or erosion
  • Unstable or settlement-prone ground conditions
  • Hard-to-access cavities beneath structures or roadways
  • Stabilisation after mining impacts or sewer damage
  1. Assessment: The void is identified and injection points are defined.
  2. Injection: The material is introduced in a controlled manner.
  3. Expansion: Depending on the system, the material expands and fills the entire volume.
  4. Compaction: Adjacent loose zones are stabilised and load-bearing capacity is restored.
  • Polyurethane resins (PU309N, PU309F) – for rapid reaction, expansion and reliable void filling
  • Urea-silicate systems (US509F) – for stabilisation, void filling and controlled ground improvement
  • Hybrid and specialised systems (HMS317) – for large-volume filling and project-specific requirements

Void filling primarily restores load-bearing capacity by closing voids and loose zones in the subsoil. Slab lifting uses the same injection process but additionally aims to precisely lift sunken structures through controlled expansion. In practice, both methods are often combined.

  • Targeted filling without large-scale excavation or demolition work
  • Suitable for use during ongoing operations
  • Applicable in hard-to-access areas
  • Permanent restoration of load-bearing capacity
  • Can be combined with slab lifting and ground consolidation
  • Foundation areas and floor slabs
  • Traffic surfaces and infrastructure structures
  • Voids beneath structures or within the subsoil
  • Rehabilitation and stabilisation measures

Consulting and support

RASCOR has been developing and delivering specialised injection and stabilisation solutions for infrastructure and construction projects worldwide for decades. Our systems are used by construction companies, infrastructure operators and engineers who require reliable, long-lasting waterproofing solutions.

 

We support you in selecting the right system – tailored to your application, requirements and project conditions.