Our Terefil® technology provides an advanced lightweight cellular concrete for soil replacement, large void filling, and pipe abandonment.
Terefil is a Mainmark technology to create a lightweight cellular concrete.
Cellular concrete is a versatile and lightweight material that has found extensive use in construction and civil engineering applications.
Terefil is produced by adding a foaming agent to a cementitious slurry, which results in the formation of a large number of air bubbles within the mixture. The foaming agent is responsible for creating the air voids that give foamed concrete its characteristic low density.
Advantages of Cellular Concrete: Beyond Traditional Mixes
Cellular concrete stands out for its unique properties, catering to a wide spectrum of applications.
It boasts a lower density, ranging from 500 to 1500 kg/m3, which is a stark contrast to the 2,400 kg/m3 found in traditional concrete.
Though its compressive strength, which spans from 0.5 to 5 MPa, might seem low compared to standard concrete, it perfectly meets the needs of scenarios prioritizing a lightweight, free-flowing material.
Soil Replacement with Terefil®
In a ground improvement application, Terefil® is used to create a lightweight raft prior to building construction.
Weak, compressible or liquefiable soils are excavated to a designed depth and replaced with cellular concrete. This reduces the weight on the underlying soils and provides an engineered fill material with consistent strength and stiffness properties.
Testimonial – Redevelopment of Wainuiomata High School using Terefil Cellular Concrete
“Mainmark played a major part in the successful completion of the Redevelopment of Wainuiomata High School carried out over 4 main stages from 2021 to 2024.
The designers picked Terefil (a lightweight cellular concrete) as a substitute for traditional ground improvement methods. The process for installation, and the completion rates that Mainmark were able to produce were very well communicated. The Mainmark team provided an awesome service. Completing the filling operations with an average of 100-130m3/ day as promised, which was largely dependent on the capacity of the local grout supplier. They brought plenty of experience to the table and did everything that they said they would.
Overall, Naylor Love were impressed. Terefil is a self-levelling and self-compacting product, making it easy to meet the level requirements through the raft construction, also the final site level. Mainmark’s quality assurance measures also ensured that the specified strength and compaction requirements of the raft was consistently achieved throughout the project. The results of which were clearly communicated through to Naylor Love in a timely fashion throughout the construction.
We were very happy with both the team on site and the team behind the scenes and wouldn’t hesitate to recommend them for future projects.”
James Prestney
Quantity Surveyor Team Leader at Naylor Love
The Fluidity Factor: Cellular Concrete in Action
One of the standout attributes of cellular concrete is its high fluidity. This material can be pumped over long distances, filling gaps, trenches, or voids.
There is typically no need for levelling or compaction. This fluid nature proves invaluable when filling trenches, decommissioned pipelines, or spaces behind retaining walls, as it seamlessly flows around obstructions ensuring a consistent fill.
Unique Features of Terefil®
Adjustable Density
Terefil® can be tailored to a density range between 500 – 1,500 kg/m3, fitting diverse project needs.
Reliable Compressive Strength
Starting at 0.5 MPa, its compressive strength can be modified based on the desired density.
Rapid Installation
With a rate of up to 40 m3 per hour, Terefil® ensures a time-efficient installation process.
Quick and Consistent
Terefil® sets in just hours and offers a self-levelling, highly flowable application.
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