Thanks HS. There are a couple of interesting technical bits which are worth citing from your source.
Oscar Rodriguez from Rodriguez Engineering, one of the subcontractors working on the project, explained how the surface at COTA is not an average one. “The overall design of the asphalt mix for the track is crucial to the performance of the car,” said Rodriguez. ”We work with Tilke and asphalt expert, Dr. Reynard Hart, to produce a mix that is up to their specifications”.
Dr. Hart who works closely with Tilke as a consultant, has paved most of the F1 circuits around the world and his knowledge and expertise was crucial to the overall success of this project. The last minutes of the paving process were crucial and Hart was actively involved with Austin Commercial technicians to make sure the surface was even and the joints of pavement on top of Turn 1 were up to the highest standard.....
The paving process at COTA took a little over 4 months. Each layer was specifically designed to meet FIA standards and to support local weather conditions. The first layer, or “base course,” is meant to support the vertical forces of the cars. The second layer, or “binder course,” is designed to support the horizontal forces of the cars during acceleration and breaking. The final layer, or “wearing course,” is meant to provide grip at high speeds.
I did not know who is Tilke's expert for asphalt. It is good to know they optimize the expertise in this crucial field.