Abandoned pipelines can create serious safety hazards and environmental problems. They effectively create underground voids, which can cause subsidence, soil destabilisation, and water ingress.

This can increase the risk of residual fluids leaking into public areas and the ground collapsing.

In the interest of public safety and satisfying legal requirements, it is vital that councils decommission abandoned pipelines and fill the voids properly, quickly, and safely.

Terefil from Mainmark provides lightweight, engineered void fill solutions for concrete pipes of every size. Surpassing even the capabilities of cellular concrete or foam concrete, Terefil is a unique, specialist flowable fill material that can fill massive pipelines and concrete culverts quickly and cost-effectively. It is the lightweight polymer-modified cementitious fill of choice for mission-critical projects, ideal for when granular fills or aggregate material options are too heavy, site access is limited, or project schedules are tight.

Our team works fast to minimise downtime and our methods allow for fast recovery time, returning pipelines to full operation quickly.

We can decommission a variety of pipelines and culverts

Terefil can be used to void fill abandoned:

  • fuel tanks
  • concrete pipes
  • concrete culverts
  • manholes
  • tunnels
  • underground tanks
  • sewers
  • water mains
  • trenches
  • mineshafts
  • sinkholes
  • wing walls



Density and strength can be matched to specific job requirements

A versatile and reliable solution that delivers engineered outcomes

Lightweight with a density as low as 400kg/m3

Reduces pressure on existing and surrounding infrastructure, including retaining walls, bridge approaches and slip planes

Can be placed at up to 130m3 an hour

A cost-effective solution for time-sensitive projects and tight schedules

Highly flowable and can be pumped more than 1,000 metres

Ideal for projects with site access issues

Achieves strengths of between 500 and 6,000 kPa (at 28 days)

Can withstand high loads, including large machinery and vehicular traffic, making it ideal for heavy traffic environments such as abandoned mines, runways and roads

Can stabilise soil without distributing or redirecting natural water flow

Hydraulic pressure and water supply are not compromised