The solution that was implemented was to lay 2 layers of S&P asphalt reinforcement grids to to make optimum use of the existing structural substance on the one hand, and on the other hand to ensure that the new structure is able to withstand the future traffic loads. This was done as follows:

• Milling was carried out to a depth of 2-3 cm
• A 3 cm levelling layer was laid
• Pre-bituminised S&P Carbophalt^® G was installed onto bitumen tack coat
• A 6 cm BA 0/16 binder course was installed on top
• Pre-bituminised S&P Glasphalt^® G was installed onto bitumen tack coat
• Finally a 4 cm SMA wearing course was laid on top

The combination of the two S&P asphalt reinforcement products in this project had specific goals. The high tensile carbon fibre in S&P Carbophalt^® G placed on the underside of the new asphalt structure is designed to increase flexural strength and stiffness, allowing for more uniform load transfer across the entire structure. S&P Glasphalt^® G under the asphalt wearing course acts as an additional safeguard against the possible propagation of cracks from the substructure and stress cracks from the traffic load.

The total thickness of the newly laid asphalt layers equalled approximately 13 cm, which was a huge saving on the previous plan where new layers totalling 27 cm were due to be laid. This ultimately led to a substantial saving on resources, construction and road closure times, as well as being able to keep the original pavement structure in place.

Project tracking

In Spring 2007 new control measurements were taken revealling a significant decrease in deflections compared to the initial condition. The success of the project led to the decision to implement this recommendation as a standard solution in the following years. In 2007, approximately 8000 m² of road section on the DK 6 in Malechowo was relaid using this technology. Then the same solution was also used in 2009 in Ryman and Nieradz, where 11000 m² and 22000 m² of road surface were rebuilt in the same way.

Also, following the installation of the S&P asphalt reinforcement grids, S&P continued to track the project to ensure the road remained in very good condition. This can be seen in the images below from 2011 and even 8 years after the installation in 2014, where no damage was observed on the wearing course.