The world's most advanced lightweight cementitious fill


Terefil™ lightweight cementitious fill

Terefil™ is a technologically advanced, engineered lightweight cementitious based filling product.

Suitable for use in a vast range of geotechnical settings, the structural filler is a specialist material ideal for where other filling solutions are too heavy, where there is restricted access to the site or where project timelines are limited.

Lightweight filling options for geotechnical applications

Terefil is a superior and inexpensive alternative to traditional means of void filling such as aggregate fill. Terefil provides many advantages such as:

  • Suitable for broad range of buildings and assets; from mass void fill, to pipe decommissioning
  • Delivers a fast and controlled economic outcome
  • Strength and density characteristics can be tailored to meet each individual project requirements
  • Self-levelling, zero bleed, minimal shrinkage
  • Lightweight material reduces the pressure on retaining walls, bridge approaches, and slip planes

Terefil is stable and distributes uniformly, allowing for pumping distances much larger than traditional cement or foam fill products.
Cement slurry is mixed together with a designed hydrocarbon foam agent to produce the unique Terefil product with a proportional dispersion of patented air bubbles. These air bubbles are encapsulated in the cementitious solution leaving a cellular void structure on setting.The highly flowable Terefil material can be transported across significant distances, meaning that restricted access issues are easily overcome.

The pumped material does not require any further treatment, it flows into voided space with typically less than 0.1%* shrinkage and zero bleed, unlike other conventional means of filling where operative entry, compaction or preloading is required. The Terefil material can be pumped at reduced pumping pressures where it is anticipated that the element for filling may be in a fragile condition, such as damaged pipeline for abandonment.


Terefil is adaptable and can be used in multiple construction, civil and mining applications, such as:

  • Abandoned pipelines, culverts, reservoirs, tunnels and tanks
  • Mass void fill for landslip or flood wash out repair, abandoned mines and sink holes
  • Backfilling of retaining walls structure
  • Temporary or permanent trench or manhole backfilling
  • Filling of annulor voids
  • An alternative to traditional sub-grades used in the construction of roads, airports and sport facilities
  • As a building platform, sub grade replacement or repair

The properties of Terefil can be tailored to suit the individual requirements of each project, allowing for variations to the strength and density, making Terefil an ideal product to deliver bespoke engineered results.The water used in the mixing process is entirely consumed in the hydration process and there is negligible shrinkage and no separation upon curing. Terefil can be placed swiftly and with precision making it a favourable option for limited timeline projects, for example projects requiring road closures, emergency works or shut downs.

*Typically shrinkage is between 0.1% – 0.3%, subject to strength.




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Mainmark United Kingdom
Unit 8,
6 Erica Road,
Stacey Bushes Industrial Estate,
Milton Keynes,
MK12 6HS,
United Kingdom

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