Combining cement, lime, or fly ash to increase load-bearing performance.
Aggregates for Highways & Road Construction
Essential Materials for Sub-base, Base & Surface Layers
Aggregates are a fundamental component in highway and road construction, providing the strength, stability and drainage required to support heavy traffic and withstand long-term wear. At RedRox, we supply a full range of aggregates used in all layers of road infrastructure—from subgrade improvement to final surface finishes, with both quarried and recycled options available across England, Scotland and Wales.
Where Aggregates Are Used in Highways:
Subgrade Improvement
Used to improve the load-bearing capacity of weak soils before laying structural layers.
Often stabilised with lime, cement, or fly ash.
Sub-base Layer
Typically composed of MOT Type 1, Type 3, or recycled aggregates.
Acts as a load-distribution layer to reduce pressure on the subgrade.
Also improves drainage and frost resistance.
Base Layer
A thicker, stronger aggregate layer that provides structural support.
May be stabilised using cementitious (cement, slag, fly ash), bituminous (bitumen or tar), or synthetic additives (resins, fibers, geosynthetics).
Surface Layer
Aggregates are used in asphalt and surface dressing, offering resistance to polishing and skidding.
Requires hard, durable aggregates like granite or basalt for long-lasting performance.
Types of Stabilised Aggregate Used:
Cementitious Blends
Bituminous Stabilisation
Incorporating bitumen or tar for flexible pavement layers.
Synthetic or Composite Additives
Including resins, fibers, and geosynthetics to enhance strength and durability.
Recycled Aggregates
Sustainable alternatives for base and sub-base construction, reducing environmental impact and project costs.
- Distributes traffic loads evenly across layers to prevent rutting and deformation
- Promotes drainage to prevent waterlogging and freeze-thaw damage
- Improves durability and structural integrity of the pavement
- Enhances skid resistance and surface grip when used in asphalt mixes
- Reduces maintenance costs and extends pavement life
We supply:
- MOT Type 1 & Type 3
- 6F5 / 6F2 Capping
- Asphalt Aggregates (Polished Stone Value – PSV certified)
- Recycled Sub-base & Planings
- Rock Armour for verge protection or embankments
- Stabilisation-ready materials
With nationwide delivery and a wide fleet of vehicles, we ensure timely, compliant, and cost-effective supply to highway schemes of any size.
Planning a highways project?
Contact RedRox for technical advice, material recommendations, and reliable delivery—day or night.
Quarried Aggregates
RedRox supplies a comprehensive range of quarried aggregates, sourced from some of the most reputable and strategically located quarries across England, Scotland and Wales.
Recycled & Secondary Aggregates
At RedRox, we are committed to promoting sustainable construction by offering a wide range of recycled and secondary aggregates as environmentally responsible alternatives to quarried products.
Sub-Bases & Bulk Fills
At RedRox, we supply a full range of Series 800 compliant quarried sub-base aggregates, suitable for a wide variety of applications.
Rock Armour & Rip Rap Supply
RedRox supplies Rock Armour, also known as Rip Rap, across England, Scotland and Wales, offering one of the widest selections of stone types and sizes available in the UK.