Versatile, lightweight cementitious fill for geotechnical applications
Terefil from Mainmark is the most advanced structural lightweight polymer modified cementitious-based filler.
Surpassing even the capabilities of cellular concrete or foam concrete, Terefil is a unique, specialist material that can solve a wide variety of geotechnical challenges in the construction, and mining industries.
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,
Terefil is highly-flowable, so it can be pumped over long distances, overcoming many site access issues. The lower pumping pressures also reduce the risk of damage to nearby pipes or other in-ground structures. Terefil is easily-placed and does not require pre-loading or compaction: it simply flows into spaces to fill voids with zero bleed.
Like all Mainmark products, Terefil is environmentally inert and cost-effective. It uses much less water than traditional foam fill methods.
What is Terefil?
Terefil contains a uniformly-distributed matrix of air bubbles generated by mixing cement slurry with stable, pre-formed hydrocarbon foam. Cementitious materials encapsulate the air bubbles, then dissipate, leaving a void structure. Compared to typical foam fills, Terefil is far more stable, has a greater lift thickness, and can be pumped greater distances.
Terefil can withstand significant pressure, maintaining its integrity even under heavy loads.
What applications can Terefil be used for?
Terefil is a desirable alternative to expensive, traditional void filling methods such as aggregate or granular fills. With a shrinkage often of less than 0.1%*, and zero bleed, Terefil can be used for:
- decommissioning underground fuel tanks, culverts, pipes, and tunnels
- mass fill for large voids, underground tanks, sink holes, and abandoned mines
- bridge approaches
- landslip repairs
- retaining walls and wing wall backfill
- services trench and manhole backfill
- permeable sub-grade beneath roads, major highways, airport runways, bridges, mine shafts and sporting facilities
Terefil is lightweight, self-levelling, and cost effective. The density and strength is matched to the specific job requirements to deliver the required engineered outcomes, making Terefil a versatile and reliable solution. Because it is so lightweight, Terefil reduces the pressure on retaining walls, bridge approaches, and slip planes.
You can choose a pervious or impervious mix to suit your application, delivering field drainage or sub-base filtration.
Terefil is fast and easy to place, offers negligible shrinkage and no capillary separation, and water is completely consumed during hydration into the mix. It can completely stabilise soil without disturbing or redirecting natural water flow.
Terefil is ideal for time-sensitive projects, because it can be placed quickly and accurately. Once in place, Terefil can withstand heavy loads including large machinery and vehicular traffic. It doesn’t require compaction, so it is ideal for when future settlement can’t be tolerated.
*Typically shrinkage is between 0.1% – 0.3%, subject to strength.
Terefil® | Advanced engineered light-weight fill for geotechnical applications
Collapsed Mine Shaft Stabilised with Terefil®, Bespoke Cementitious Grout and Innovative Placement Techniques