Precast Firflex

Precast Firflex

Wearing course finishing system that achieves the appearance of natural stone or a precast piece with the mechanical properties of an asphalt wearing course.

High-performance design paving. Firflex is a wearing course finishing system that consists of placing a high-resistance 6 mm precast piece with the same appearance as prefabricated paving on asphalt or concrete surfaces.
PUMA Resin
The Firflex piece is composed of a base of polyurethane-methacrylate (PUMA) resin and different types of aggregates with the possibility to choose different textures and finishes.  The asphalt or concrete and the precast pieces are joined using PUMA resin. 
This resin is a flexible material that retains its flexibility performance and provides high resistance to wear and tear and traffic stresses.

Customisable design 
This customisable design of the pieces allows for a wide range of options with a variety of sizes, colours and types of aggregate, including guidance pieces to assist the visually impaired. Pieces can be made in thicknesses of between 4 and 8 mm. 
The permissible tolerances of the piece on the nominal dimensions for length, width and thickness are ±2 mm. An optimal finish can be obtained by using pieces with a separation joint of between 3 and 5 mm. This product complies with the current non-slip requirements for pedestrian and road traffic. 

The surface must be clean and free from waste and contamination. Surface irregularities on the base of more than 1 mm may be seen in the final finish. For concrete surfaces, the pore must be opened and binder resin must be used to ensure mechanical anchoring. The flexibility of the material makes it possible to absorb part of the movement caused by the surface, but it cannot be guaranteed that any potential cracks caused by the retraction of the concrete will not be seen in the surface.
The application temperature is between 5ºC and 30ºC. If necessary, the surface can be milled to anchor it to the existing paving. The PUMA resin (A) is then poured and levelled on the surface and the heat-softened pieces (B and C) are progressively placed. The finishing touches will be made by cutting the pieces with an angle grinder on site. The road can be opened to traffic between 2 and 4 hours after application depending on the ambient temperature.


Mechanical properties test 
The IFSTTAR assessment report tests material using a FABAC machine test. 

FABAC machines are used to test the fatigue behaviour of continuous reinforced concrete pavements, applying a load of between 0.5 and 5 km/h. The tyres used for this experiment are Michelin 315/80 R22-5 156L multiway 3D XZE.

The surfaces were subjected to three million loads (double axle half shafts loaded at 65 KN) with a loading speed of 3.6 km/h. 
To study the evolution of the samples, several tests were carried out at certain stages of the loads, using the machine at 500,000, 1 million, 2 million and 3 million cycles. The measurements consisted of SRT (pendulum test), MTD (mean texture depth) and DFT (coefficient of longitudinal friction generated between a rubber pad and the road during braking).
Three test areas allowed the Wehner and Shultze (polishing resistance) tests to be carried out, measuring the depth of wear in order to quantify the possible degradation of the samples tested caused by this problem. Testing began on 26 September 2017 and ended on 7 February 2018. The climatic conditions were representative because they ranged from relatively summery temperatures at the beginning of the test to winter ones at the end of the test. In conclusion, the experimental sample was subjected to 3 million cycles and 9/10 of test pieces did not undergo significant variation. 
Braking test
A braking test was carried out at the LCPC track in Bouguenails, France. 
The test was carried out using a Peugeot 406 equipped with different distance and braking sensors to measure braking distance, vehicle speed and brake application time.
Braking distances were performed on samples at different speeds (50, 70 and 90 km/h) with ABS. 
Tests were performed on each sample, including a reference sample of new and old asphalt pavement, thick Firflex, thin Firflex and precast Firflex.  


  • Applied in thicknesses of between 4 and 8 mm
  • Can be applied on asphalt or concrete surfaces
  • Withstands all types of traffic
  • Adapts to the movement of flexible paving to avoid paving stone breakage
  • Opening to traffic in 2 hours
  • Non-slip
  • Fuel-resistant
  • Guidance for the visually impaired
  • No need for joints
  • Decorative

Viscosity at 25ºC 180-240 mPa-s
Density at 25ºC 1.00 g/ml
Mix duration/treatment time at 20ºC 15 min
Drying time at 20ºC 40 min
Flammability temperature + 11.5ºC
Tensile strength 8.1 N/mm
Maximum tensile elongation 395%
Elastic modulus 42 N/mm
Shore A hardness >95
Shore D hardness 46