3 ms·

That’s interesting. I wonder what goes into reusing old asphalt (i.e. what new chemicals need to be added/removed in order to make old asphalt pliable or whatev

That’s interesting. I wonder what goes into reusing old asphalt (i.e. what new chemicals need to be added/removed in order to make old asphalt pliable or whatever the term is to lay it again).

Shivetya 6y ago
It isn't just the asphalt that is recycled but many other products are recycled into it as well, shingles, tires, and even glass, can all end up into it. what they take off the road can be ground and used on site for a layer but mostly its carted off and ground to the same size as the original aggregate and combined into new. since the binding material is still present it reduces the need for more oil byproducts
- azinman2 6y ago
  Super interesting. I always assumed it was a gigantic use of oil globally. Sounds like it doesn’t have to be. But most of those items are oil originated. At what point can we make asphalt without any new oil?
- iscrewyou 6y ago
  The term describing this is: RAP (Recycled Asphalt Pavement). https://www.fhwa.dot.gov/publications/research/infrastructure/pavements/11021/11021.pdf https://www.fhwa.dot.gov/publications/research/infrastructur...
- jiofih 6y ago
  That sounds great for the environment - let’s grind and hide this pile of trash for a few decades, what could go wrong.
dawnerd 6y ago
I'm sure it goes through some cleaning but generally just heating it up makes it pliable again.
skj 6y ago
Heat, probably.
majormjr 6y ago
Generally it's crushed and a percentage of the final mix uses the recycled crushed asphalt. The quality of the asphalt is lower with higher amounts of recycled materials so high traffic roadways like highways may use 30% recycled asphalt. While lower traffic roadways or things like bicycle paths can use a higher percentage with new binder in the mix.
marcosdumay 6y ago
Recycling asphalt takes mostly heat. You lose some of it on the process, so you must add some new asphalt, and the new asphalt doesn't have the same composition of the original one (but is still asphalt, or asphalt components).
LegitShady 6y ago
Milled and Crushed, heated, some new aggregates mixed in, new oil, good to go. You can look up mobile asphalt batch plants if youre interested

That’s interesting. I wonder what goes into reusing old asphalt (i.e. what new chemicals need to be added/removed in order to make old asphalt pliable or whatever the term is to lay it again).

Shivetya 6y ago

It isn't just the asphalt that is recycled but many other products are recycled into it as well, shingles, tires, and even glass, can all end up into it. what they take off the road can be ground and used on site for a layer but mostly its carted off and ground to the same size as the original aggregate and combined into new. since the binding material is still present it reduces the need for more oil byproducts

azinman2 6y ago
Super interesting. I always assumed it was a gigantic use of oil globally. Sounds like it doesn’t have to be. But most of those items are oil originated. At what point can we make asphalt without any new oil?
iscrewyou 6y ago
The term describing this is: RAP (Recycled Asphalt Pavement). https://www.fhwa.dot.gov/publications/research/infrastructure/pavements/11021/11021.pdf https://www.fhwa.dot.gov/publications/research/infrastructur...
jiofih 6y ago
That sounds great for the environment - let’s grind and hide this pile of trash for a few decades, what could go wrong.

dawnerd 6y ago

I'm sure it goes through some cleaning but generally just heating it up makes it pliable again.

skj 6y ago

Heat, probably.

majormjr 6y ago

Generally it's crushed and a percentage of the final mix uses the recycled crushed asphalt. The quality of the asphalt is lower with higher amounts of recycled materials so high traffic roadways like highways may use 30% recycled asphalt. While lower traffic roadways or things like bicycle paths can use a higher percentage with new binder in the mix.

marcosdumay 6y ago

Recycling asphalt takes mostly heat. You lose some of it on the process, so you must add some new asphalt, and the new asphalt doesn't have the same composition of the original one (but is still asphalt, or asphalt components).

LegitShady 6y ago

Milled and Crushed, heated, some new aggregates mixed in, new oil, good to go. You can look up mobile asphalt batch plants if youre interested