High friction surfacing material

LKAB Minerals offer a range of Calcined Bauxite for use in High Friction Surfacing (HFS).

What is high friction surfacing?

High friction surfacing (HFS) is a highly effective surface treatment proven to increase the skid resistance of asphalt roads and other high transportation areas. The high level of skid resistance is created by the use of Calcined Bauxite, the optimum aggregate for anti-skid applications. LKAB Minerals supply calcined bauxite to the HFS industry, with optimum properties for use in hot or cold applied anti-skid systems.

Calcined Bauxite for high friction surface coating

LKAB Minerals calcined bauxites originate from China or Guyana and are aggregates formed from aluminium ore which has been subjected to calcination, a heat treatment process. When calcined, Bauxite has exceptional physical hardness and stability, leading to excellent resistance to abrasion caused by the vehicle’s tyres and a high resistance to polishing making it ideal for HFS applications.

Surfaces benefiting from calcined bauxite

The high friction surfacing treatment can be applied to any surface. Typical applications for HFS include:

  • Junctions
  • Pedestrian crossings
  • Intersections
  • High accident level areas
  • Pedestrian walkways and cycle paths

The installation of High Friction Surface at the toll booths on the Humber Bridge, UK, utilising LKAB Minerals Calcined Bauxite

Properties of Calcined Bauxite for HFS

There are a number of properties Calcined Bauxite must be tested for prior to being suitable for use in high friction surfacing applications. These are defined by the Road Safety Treatment Association’s (RSTA) Code of Practice and include:

Polished Stone Value (PSV)
70 Min.
Aggregate Abrasion Value (AAV)
4 Max.
Relative Density (SSD) 2.8 Min.

Moisture Content 0.5% Max.

Grading (passing) 3.35mm 95% Min.
Chemical Composition Al2O3 82.0% Min.

Fe2O3 4.5% Max.

SiO2 12.5% Max.
  K2O+Na2O
0.5% Max.
  TiO2
4.5% Max.

Our materials are verified using the BS and EN Test Methods proposed by the RSTA (above). You can read more about the Road Safety Treatments Association (RSTA) or view the code of practice here.

LKAB Minerals supply a range of Chinese and Guyanese calcined bauxites with consistent properties intended for use with the Highway Authorities Product Approval Scheme (HAPAS) and the British Board of Agrément (BBA) certified Type 1 high friction surfacing systems. The BBA/HAPAS certification covers the materials used in, and the installation of the anti-skid surface; testing is carried out on performance and durability of the anti-skid surface including scuffing, wear, resistance to frost & fuel and installation tests.

Benefits of high friction surface treatments

The use of calcined bauxite in high friction surfacing applications has a number of benefits including:

  • A reduction in road traffic accidents of over 50% compared with normal surfaces
  • It’s a cost effective solution when compared with the value imparted to traffic collisions
  • It is installed by specialist companies and all materials are approved by regulators

To find out more about high friction surfacing or our range of calcined bauxites, please contact us.

Pedestrian areas

LKAB Minerals offer calcined bauxite and olivine, a decorative green material. Both are suitable for low traffic volume areas including cycle and pedestrian pathways and recreational areas.

Calcined bauxite and olivine is suitable for anti skid pedestrial and cycle routes

Application expert

Martin Meese
Product Manager, Foundry & Glass

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