Civil Engineering with Recycled Tyres: Applications Beyond Landfill

By:     Kieran Donnelly

Expert review by:     Conor Murphy

Civil engineering projects across the UK are increasingly specifying recycled tyre material not as a compromise, but as the engineered solution of choice. Road foundations over soft ground, flood defence embankments, retaining wall backfill, coastal revetments; each application draws on the same core properties that make compressed rubber a serious construction material: low density, high permeability, chemical resistance, and long-term durability in aggressive environments.

PAS 108-compliant tyre bales are now supported by peer-reviewed research, WRAP technical guidance, and over 15 years of field performance data from installed structures across the UK and beyond. This guide covers the full range of civil engineering applications where recycled tyre material is used, what makes rubber perform well in each context, and what specification is required.

Why Recycled Tyre Material Has Found a Place in Mainstream Engineering

The civil engineering industry’s adoption of recycled tyre material as a construction resource is not an environmental gesture. It is a practical response to the material’s properties. Compressed rubber is durable, chemically resistant, free-draining, lightweight relative to conventional fill, and available as a consistent engineered product through PAS 108-compliant tyre bale production. Crumb rubber and tyre-derived aggregate have their own established application niches in rubberised asphalt, playground surfacing, and acoustic products.

The adoption was gradual and required the development of a standards framework (PAS 108) and a substantial body of engineering research to translate material properties into design values that engineers could use with confidence. That work is now done. Tyre bale civil engineering use is supported by peer-reviewed research, WRAP technical guidance, and a decade and a half of field performance data from installed structures across the UK and internationally.

This guide covers the range of civil engineering applications where recycled tyre material, primarily PAS 108-compliant tyre bales, is used. Each application is described in terms of why rubber performs well in that context and what specification is required.

Road and Access Track Foundations Over Soft Ground

Road foundations are the most established application for PAS 108 tyre bales in civil engineering, and the one with the most extensive published case study evidence. The engineering principle is described in detail in Gradeall’s guide to tyre bales for road construction over soft ground: the low density of tyre bale fill reduces the vertical stress applied to the soft subgrade beneath the road, preventing the subgrade failure and differential settlement that would otherwise require expensive ground improvement works.

This application is relevant across a wide range of road types: rural access roads over waterlogged ground, haul roads on construction and mining sites, internal roads on landfill and industrial sites, and agricultural access tracks over peaty or silty subgrades. In each context, the economics of tyre bale foundations compare favourably against the cost of conventional soft ground improvement.

For higher-specification permanent road infrastructure, the technique requires more detailed geotechnical assessment and is applied by engineers with specific experience of tyre bale road foundation design. WRAP’s published guidance documents provide the design parameter data needed for this work.

Lightweight Embankment Fill

Embankment construction over soft or compressible ground uses tyre bale fill to reduce the net load applied to the foundation soils, limiting settlement and improving stability. This application shares the same engineering principle as road foundations, but at a larger scale, relevant to road and rail embankments, flood defence banks, and approach embankments to bridge structures.

The comparison with EPS (expanded polystyrene) lightweight fill is often relevant in embankment applications. EPS provides a lower density than tyre bales, which is relevant where load reduction must be maximised on extremely soft ground. For most embankment applications, tyre bale fill achieves sufficient load reduction ata lower cost than EPS.

The guide to tyre bales as lightweight embankment fill covers the design considerations, including the comparison with conventional fill and alternative lightweight fill materials. Producing bales for embankment fill supply requires PAS 108 production capability from the MKII Tyre Baler with appropriate pre-processing using the truck tyre sidewall cutter for truck tyre bales.

Retaining Wall Drainage Backfill

The high permeability and low density of tyre bale fill make it useful as drainage backfill behind retaining walls. Free-draining backfill keeps pore water pressure in the retained soil low, which reduces lateral pressure on the wall and improves long-term wall performance. The low density of tyre bale fill also reduces the total backfill load on the wall structure compared to granular fill at equivalent volume.

This application is particularly relevant for basement waterproofing, perimeter drainage, highway cutting retaining walls, and agricultural terrace walls, where budget constraints make tyre bale fill attractive relative to specialist drainage products.

Slope Stabilisation and Erosion Control

Tyre bale structures placed at slope toes or within slope profiles provide buttressing against downslope movement and resistance to erosion at vulnerable toe positions. This application extends from small agricultural slope management through to significant civil engineering works on road cutting slopes, coastal cliff toes, and mine site spoil heap slopes.

The durability of rubber in aggressive environments, including coastal salt spray, acidic mine drainage, and frost-exposed positions, makes tyre bale structures appropriate for erosion control locations where timber, EPS, or other organic materials would degrade over time. The guide to tyre bales for erosion control and slope stabilisation covers the construction methods and design considerations for this application.

Coastal and Shoreline Defence

Tyre bale revetments protect cliff toes and river banks from wave and current action. The material’s resistance to marine conditions, its ability to absorb wave energy through the void structure, and its low cost relative to rock armour make it a practical choice for lower-energy coastal protection where rock armour would be over-specified and cost-prohibitive.

Field monitoring of coastal tyre bale installations indicates a service life of 15 or more years in moderate energy environments. This is the application where rubber’s chemical and physical durability in the marine environment is most directly relevant to material selection.

Landfill Engineering

Tyre bale drainage layers, internal access roads, and slope stabilisation structures within landfill sites are covered in detail in the guide to tyre bales in landfill engineering. The chemical resistance of rubber to leachate, the high permeability of bale fill for leachate collection, and the low density of access road foundations over waste fill are the properties most relevant to this application cluster.

SUDS Attenuation and Drainage

Sustainable urban drainage applications use tyre bale fill as permeable attenuation storage and as structural fill in SUDS earthworks. The 30 to 50 per cent porosity of a tyre bale fill layer provides meaningful attenuation volume for surface water runoff management. The high permeability ensures free drainage within the fill zone. These properties are covered in the guide to tyre bales for SUDS.

Noise and Vibration Attenuation

Rubber’s natural acoustic damping properties make tyre bale walls useful as noise barriers and vibration attenuation structures in some applications. Roadside noise barriers using tyre bale fill faced with soil and vegetation have been installed at locations where hard reflective barriers would be visually intrusive or where the acoustic performance of a mass barrier is sufficient for the required noise reduction.

Vibration attenuation beneath sensitive buildings or around industrial machinery installations using rubber-based isolation systems draws on the same material property. While this application typically uses crumb rubber or solid rubber components rather than whole bales, it reflects the same underlying material characteristic that makes tyre rubber useful in engineering: its ability to deform elastically under load and absorb energy rather than transmit it.

Agricultural Applications

Tyre bale fill has been used in agricultural retaining walls, field drainage systems, and access track improvements where the combination of low cost and adequate structural performance meets the requirements of agricultural construction. Agricultural retaining walls on sloping land benefit from the same free-draining, lightweight fill properties relevant to highway retaining walls, at a cost that suits agricultural budgets.

The Supply Chain for All of These Applications

All of the civil engineering applications described here require PAS 108-compliant tyre bales as the material specification for structural uses. The common thread in supply is the same: PAS 108 production capability from equipment designed for the specification, operated with appropriate pre-processing, and supported by a quality management system that documents compliance.

The MKII Tyre Baler is the production equipment that makes a civil engineering bale supply possible. The pre-processing line includes the tyre rim separator and truck tyre sidewall cutter for consistent input preparation. The full tyre recycling equipment range covers every stage from intake through to bale ejection. Gradeall International has nearly 40 years of manufacturing experience in tyre recycling and waste management equipment from its facility in Dungannon, Northern Ireland. Contact Gradeall International to discuss equipment specifications for civil engineering bale supply.

Frequently Asked Questions

Recycled tyre material raises practical questions from engineers, procurement teams, and recycling operators alike. Here are the answers to the most common ones.

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