Hello everybody,
I noticed multiple times, that when reconstructing roads here in Switzerland, the surface / top layer of the pavement is usually laid several weeks / months after the lower layers. For a significant amount of time, the road or sidewalk is left in an intermediate state (see attached pictures). The pictures show an unfinished side-walk, but I’ve seen this happen with road pavements as well, where the wear-layer – which lately is a sound-absorbing mixture of asphalt – is laid well after the previous layers.
Can somebody confirm that this is a deliberate practice or I just happen to come across exceptions where I live? If this is indeed a practice, what’s the reason behind it? Anybody familiar with the norms and regulations in this domain? Thanks ahead for the insights.
Cheers!
by AltruisticMist142
2 comments
Yes, it has to be done this way. Also on highways, everywhere when putting down asphalt
It’s the foundation layer (15-20 cm), it must “cure and adapt”, being pressed by the weight of vehicles, adapt due to temeratures etc. When it’s stabilized the wear layer is done (2-5 cm). The wear layer can be scraped and redone after some years saving money.