Asphalt - Chemie im Straßenbau

Roads are one of the defining features of modern civilizations, believe it or not. To me and I think most others, the state of the roads in a country gives an idea of the level of development. It does not surprise then that chemistry features quite heavily in how we make roads.
A request from a listener, I explore in this episode the chemistry of bitumen and the physical properties needed for a good road.
This podcast is still not reactivated, but if you have a topic that you are interested in and do not mind an extended waiting time until I get round to it, drop me a mail under chem.podcast@gmail.com .
Sources
Background Information
Polymer Chemistry, An Introduction Malcolm P. Stevens, 3rd Ed. Oxford University Press, 1999; ISBN 978-0-19-512444-6 pp. 70ff & 87ff
https://en.wikipedia.org/wiki/Asphalt
https://de.wikipedia.org/wiki/Asphalt_(Geologie)
https://en.wikipedia.org/wiki/Asphalt_concrete
https://de.wikipedia.org/wiki/Asphalt
Polymer-modified Bitumen
https://www.researchgate.net/publication/262691923_Polymer_modified_bitumen_Optimization_and_selection
http://oxidizedbitumen.org/primer-bitumen/asphalt-polymer
https://www.corrosionpedia.com/definition/3215/polymer-modified-bitumen-pmb
https://globecore.com/bitumen-modification-polymers/
https://www.sciencedirect.com/science/article/pii/B9780857090485500018
https://bitumen.globecore.com/use-polymer-bitumen-binders-road-construction
Glass Transition Temperature
https://en.wikipedia.org/wiki/Glass_transition
https://de.wikipedia.org/wiki/Glas%C3%BCbergangstemperatur
Grundlagenvideo Asphalt-Straßenbau
https://www.youtube.com/watch?v=PeMeZy9ayV8
Intro Video to Bitumen
https://www.youtube.com/watch?v=Q39vKdNuJKQ
How much bitumen per kilometer of road
https://saharabizz.com/how-much-bitumen-used-in-road-construction-per-kilometre/
Styrene-Butadiene-Styrene Polymer in Asphalt
https://www.sciencedirect.com/topics/engineering/styrene-butadiene-styrene
Video: Bier während der Arbeit? Welche Klischees über Straßenbauarbeiter stimmen? | Galileo | ProSieben
2:59 „Alle 15 Jahre muss ein Straßenbelag erneuert werden…“
https://www.youtube.com/watch?v=RpQ7ohsN2pg