This is the 9684th most frequent Spanish word.
asfáltica
Relating to or made of asphalt.
Here, 'asfáltica' functions as an adjective describing the type of road—indicating that the surface is made of asphalt.
La carretera asfáltica fue renovada el año pasado.
The asphalt road was renovated last year.
In this sentence, 'asfáltica' qualifies 'mezcla' and refers to the composition of the material used.
Se utilizó una mezcla asfáltica para reparar los baches.
An asphalt mixture was used to repair the potholes.
'Asfáltica' describes the 'layer,' indicating its nature or material type as being made of asphalt.