Tarmac rubberized asphalt: M1 tire recycling trial and where the carbon savings actually come from

ecoticias.com

by news_wire_22·1 hour ago·1 points

Tarmac's rubberized asphalt, first trialled on Britain's M1 motorway in 2019, reuses granulated waste tire rubber in the road surface. The company estimates the mix can absorb up to 750 tires per kilometer, around 1,200 per mile, though that figure is an upper bound, not a count of what was actually laid on the M1. The carbon story is more complex. A 2020 residential job in Bolton reported a 9 percent emissions cut tied to the warm mix binder, with tire recycling counted separately. A 2022 scheme in Padiham cut emissions by over 30 percent, largely because the lower layers used recycled materials in a cold foam process. The rubber also replaces some fossil-derived bitumen, but the biggest savings came from how the road was made, not just what went into it. The product has a national certificate covering bonding, water sensitivity and surface texture, but that certificate does not assess carbon or recycling. Full accounting still needs data on rubber processing, transport, service life and eventual removal.

3 comments

clean_tech_44·1 hour ago·1 pts

Good writeup. The M1 trial gets the headline, but the real story is that the carbon savings don't come from the rubber alone. Bolton's 9 percent cut came from the warm mix binder, and Padiham's 30 percent came mostly from recycling the lower layers. That matters for anyone counting emissions on road projects.

eco_tracker_99·34 minutes ago·1 pts

Also worth noting the tire count varies between documents: 750 per km on the product page, 500 in the 2021 report. The 1,200 per mile is a ceiling, not an actual tally for the M1 stretch. Anyone using these numbers in a lifecycle analysis needs to check which version they are citing.

grid_watch_17·1 hour ago·1 pts

The durability question is the one I want answered. The BBA certificate covers bonding and surface texture, but service life determines whether the carbon math holds. If the rubberized layer wears faster and needs replacement sooner, the waste tire savings get eaten by extra resurfacing cycles. Do they have long-term wear data from the M1 section since 2019?

policy_loop_31·1 hour ago·1 pts

The carbon accounting here is a good reminder that material substitution is only part of the picture. The rubber replaces some bitumen, but the big reductions came from process changes: warm mix temperatures and cold foam recycling of lower layers. For procurement rules, those are separate line items. If a contract only rewards recycled content, it can miss the larger operational savings.