AIRIUM®
Advanced Cellular Lightweight Concrete

Efficient and Cost-Effective Solutions for Road Reinstatement and Void Filling 

Logo for the Airium product that has a green blue gradient on the R

The AIRIUM® range consists of meticulously engineered cellular lightweight concretes (CLC) designed for high-performance infrastructure applications. Whether for road reinstatement or complex void filling, these materials offer self-leveling properties that eliminate the need for compaction equipment and ensure rapid, durable results. By providing a stable foam structure, AIRIUM® products completely eliminate or dramatically reduce settlement risk, enabling streamlined operations and enduring stability.


Achieve durable, settlement-free results in a single operation without compaction. It is manufactured to Holcim UK’s stringent quality protocols.
 

Benefits       Why Airium?       Applications       Specification       Related       Calculator       Contact Us

benefits

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Accelerated Construction

Enables reinstatement or filling in a single operation, expediting the process by eliminating the need for traditional soil analysis tests and mechanical compaction.

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Enduring Durability

Boasts a stable foam structure that reduces the risk of settlement/subsidence and enhances resistance to freeze/thaw damage.

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Versatile & Sustainable

Available in a wide range of densities and strengths with low-carbon options and carbon calculations provided to meet sustainability standards.

Why AIRIUM®

AIRIUM® products are engineered using Portland Cement (or GGBS blends), fine aggregates, and specialized additives to ensure high flowability and performance.

  • Self-Leveling Nature: Its high flow characteristics make it perfect for filling inaccessible or complex voids and trenches, ensuring full contact and homogeneous density.
  • Reduced Resource Needs: The elimination of compaction equipment dramatically reduces labor and machine requirements on-site, providing significant cost-efficiency.
  • Compliance: Formulations like Roadfill are fully compliant with the Specification for the Reinstatement of Openings in Highways (RAM Class RAM-3).


Holcim UK maintains rigorous quality protocols for Airium products and offers carbon calculations for projects, emphasising its commitment to sustainability and meeting diverse performance requirements. Its quick initial hardening time of 8-24 hours allows site teams to move rapidly to the next phase of work.

A worker in high visibility clothing checks a mixer truck
Foam concrete Airium Voidfill and Airium Roadfill is launched in the UK. An operative in high vis clothing is pumping the product from the mixer truck into a tub while colleagues watch on.
Airium product being poured from the mixer truck at an event in London
A Holcim UK mixer truck being filled with biochar coffee concrete at its Battersea Readymix plant in London

Applications - Voidfill

  • Ground Stabilisation: Used to fill natural or man-made voids beneath existing structures to prevent settlement.
  • Infrastructure Backfill: Ideal for filling and stabilising voids around pipelines, service ducts, shafts, and culverts.
  • Trench and Tunnel Filling: Efficiently fills redundant sewers, tunnels, and tank voids, providing secure, lasting support.
  • Embankments & Retaining Walls: Used for backfill behind retaining walls and in embankment stabilisation to reduce lateral pressure compared to traditional fill.
A30 with a road running parallel to it

Applications - Roadfill

Ideal for: 

  • Road Trenching: Compliant backfill for highways and public roads.
  • Utility Reinstatement: Ideal for reinstating openings after service or duct installation.
  • Pavement Bases: Stable sub-base for repairs where settlement is a major concern.
  • Void Filling (Roads): Filling small voids and depressions beneath road surfaces.

specification

Specification Detail

AIRIUM® Voidfill

AIRIUM® Roadfill

Product TypeCellular Lightweight Concrete (CLC)Cellular Lightweight Concrete (CLC) Road Reinstatement
ComplianceProject-Specific StandardsSROH (RAM Class RAM-3)
Wet Density Range500 – 2000 kg/m³1500 – 1800 kg/m³
28 Days Compressive Strength0.5 – 12 MPa> 4 MPa
Hardening Time8 – 24 Hours8 – 24 Hours
Key FeaturesStable Foam Structure, Freeze/Thaw ResistanceSelf-leveling, No compaction

Related Case Studies and News

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