Abandoned pipelines can create serious safety hazards and environmental problems.
An abandoned pipe effectively creates an underground void, 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 and asset owners decommission abandoned pipelines and fill properly, quickly, and safely.
Terefil® from Mainmark is a lightweight, engineered void fill solution for 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.
Find out more about our void filling technologies
Fatures & Benefits
Mainmark’s Solutions & Technologies
Our technologies have fast curing times and treated areas can be used immediately or without the delays compared to traditional repair methods.
Varied Density Choices
We provide materials across a wide density range, from 30 to 1500 kg/m3.
Our materials can be designed for strengths ranging from 50 kPa to more than 20 MPa.
Variable Flow Properties
Our materials have variable set times, from seconds to hours, and can be pumped over long distances.
Gas Main Pipes
When ageing or abandoned gas pipelines need to be safely decommissioned, they are often left in-situ to avoid the cost of substantial excavation to remove them, and the disruption this would cause to the local community. Mainmark can efficiently fill redundant gas pipes once they have been isolated from the broader gas network. Using Terefil, Mainmark’s advanced lightweight polymer-modified cementitious-based fill, works can be often be completed in one day, ensuring the pipe is structurally filled for maximum safety.
Water Main Pipes
The construction and placement of water main pipelines is important in ascertaining the potential risk of collapse and damage to the structures above ground. Disused pipelines below properties can lead to subsidence if the utility is compromised. To safely fill the pipelines, making them stable underground without the need for costly removal, Mainmark uses its unique Terefil lightweight cementitious fill which can be pumped from a single entry point. Many councils have recognised the solution for its ability to deliver a fast, cost-effective and long-term solution for filling large voids and pipes. Terefil is commonly used for decommissioning water main lines that may lie beneath private properties, roads and other sensitive sites without the inconvenience of digging and disruption to the community.
Whether due to structural damage, general dilapidation or redundancy, concrete culverts demand significant volumes of fill when being decommissioned. As a highly flowable and easily placed material, Terefil is ideal for this type of work. The solution does not require preloading or compaction for settlement mitigation, is applied both quickly and with controlled pressure, typically exhibiting shrinkage of less than 0.1% to 0.3%, subject to strength. Whatever the specification, Mainmark is able to devise the appropriate Terefil formulation to meet site specific requirements. This may include a design life of 100 years, a defined compressive strength to support above-ground needs, and resistance to other substances, such as sulphates. Despite often limited site access, Mainmark is able to monitor fill progress and success in real time using sacrificial cameras installed within the crown of the culvert. This ensures the culvert has been completely filled, with no air pockets within the crown of the pipe.
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Get in touch about your project
Submit your enquiry using our online form. Include a brief message about the type of problem you are experiencing.
One of our expert team members will be in touch to schedule a site inspection that suits you.