Foam Concrete For Voidfill & Stabilisation

The ultimate voidfill material

Porofoam Foam Concrete

Foamed concrete is a highly workable, low density material incorporating up to 80% air. It is generally self levelling, self compacting and may be pumped. Risk of plastic shrinkage or settlement cracking is significantly lower than that of standard concrete.

Porofoam is manufactured using CEMEX admixtures and is available in a wide range of densities and compressive strengths to suit your application and requirements. The product is easily placed with no compaction required and can be produced onsite by our foam generation units or delivered in trucks premixed.


Benefits Of Foam Concrete

Foamed concrete is a versatile and practical material which can be tailored to a variety of project needs and operational conditions.


  • Pumpable Foamed concrete - can be pumped significant distances and can be placed by conventional concrete pump or rotor stator pump (commonly referred to as a ‘Worm Pump’).


  • Self compacting and self-levelling - Making it ideal for inaccessible trenches where compaction would be difficult or impossible. It allows for controlled discharge into narrow opening, fully fills void space, including undercut pockets and entirely surrounds and protects pipes.


  • Freeze / Thaw Resistant - high air content makes it resistant to freeze/thaw and provides good thermal and acoustic insulation.


  • Load spreading with negligible risk of subsidence


  • Insulating Properties - can be used as a low density insulating sub-screed


  • Lightweight concrete with high air content


  • Highly Fluid - making it easy to place and finish thanks to a single process installation, simply pour and level. Controlled rates of placement to ensure suitability for any loading characteristics.


Applications For Foam Concrete

Foamed concrete is ideal for filling voids such as disused fuel tanks, sewer systems, pipelines and culverts – particularly where access is difficult. It is a recognised medium for the reinstatement of road trenches.


Unwanted voids: Pipelines, Service Ducts and Shafts, Sinkholes

Disused structures: Culverts and Subways, Redundant Sewers, Cellars and Basements Higher

Structural stabilisation: Bridge Abutments, Tunnel Stabilisation, Embankments

Insulating Fill: Low density insulating sub-screed, Insulating fill to house over-sites

More Information About Foamed Concrete


Porofoam can be tailored to your requirements, our technical team will create a suitable mix design for your application. Porofoam can achieve strengths of up to 20 N/mm2and our unique production process allows us to produce an extremely wide range of dry densities from as low as 300kg/m3 up to 2000kg/m3. For strengths and densities outside of this range our team will work with you to provide a solution.



Porofoam can be pumped, horizontally, vertically, or directly placed in layers of up to 1m single lift depth in order to maintain the required air void structure. The fluid nature of Porofoam allows the concrete to free flow into even the smallest of spaces making it highly suitable for voidfill applications. Porofoam can be pumped by either a conventional concrete pump or rotor stator pump. The material typically remains fluid for 2/3 hours after mixing with the foam (dependent upon ambient conditions). Porofoam also exhibits no settlement characteristics that may occur with granular fill materials allowing a much more stable fill.



Porofoam foamed concrete can be supplied with or without coarse aggregate depending on the type and application. The stable bubble structure can be introduced into the mix in three ways:


By blending a pre-formed foam into a mortar base mix after mixing or at site, enabling the achievement of ultra low densities.


By adding specially formulated air-entrained admixtures into the concrete during the mixing process. This generally produces an entrained air content of between 10% and 25%. The resultant material is referred to as High Air-entrained Concrete (HAC) or High Air-entrained Mortar (HAM)


By adding foam generating admixtures to a mortar base mix after mixing or at site. This will produce higher levels of entrained air than air-entraining admixture and consequently a lower density.



Call our Product Support Helpline for more information on 01926 818264




We're Here To Help

CEMEX will provide you access to our highly experienced technical team who will be able to create bespoke mixes for all your readymix concrete needs.

Our technical team has a vast experience of producing unique mixes for individual jobs, and can facilitate issues such as corrosive ground conditions, extreme weather conditions and high strength requirements.

CEMEX will work to your specification, or if requested provide suggestions to ensure that we meet the specific needs of your project.

Porofoam Case Studies

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Other Voidfill Products


Roadfill - An efficient and cost-effective reinstatement material that complies with the Roads and Streets Works Act 1991. Roadfill is available as FCR Classes C2 and C4. There is no settlement with so therefore it can be fully resurfaced in one operation. There is also no need for compaction equipment. Applications: Reinstatement of temporary opening in streets and highways, Protection of buried services, Road Pavement Reinstatements


Tankfill - The more cohesive property of Porofoam Tankfill allows a controlled discharge into tanks with a restricted entry point. Air and gases in the tank are gradually displaced by the foamed concrete . Being a cellular fill, Porofoam is less prone to penetration from external contaminants. Porofoam Tankfill meets the building regulation codes for fire resistance. Applications: Filling of disused petrol and oil tanks, Filling of effluent and water tanks, Filling of redundant Silos