For all the noise around sustainable pavement, the math underneath is surprisingly simple. Most of the carbon in a road isn't in the mix you place — it's in the cycle you repeat. Build, weather, mill, repave, repeat. Every shortened cycle is a win. Every extended cycle is a bigger one.
That's the case for aramid fiber reinforcement, and a newly published technical report from iNFORCE — Surface-Tech's partner across Australia and New Zealand — puts hard numbers on it. The findings line up with what specifying agencies in North America have been seeing in the field for more than a decade, and they matter for any owner, DOT, or contractor now operating under low-carbon procurement rules.
Here's what the data shows, and why ACE XP™ deserves a seat at the table the next time your team writes a sustainability spec.
A typical hot-mix asphalt carries cradle-to-gate emissions of roughly 60–75 kg CO₂e per tonne — a figure consistent across published EPDs from major producers including Downer, Boral, Fulton Hogan, and Higgins Contractors, and broadly aligned with North American producer EPDs.
ACE XP™ adds aramid fiber to that mix at approximately 106 grams per tonne of asphalt. The published ACE-XP EPD shows the fiber contributes about 0.65 kg CO₂e per tonne of asphalt — roughly 1% of the total cradle-to-gate footprint.
That's the cost. Now the benefit.
Independent lifecycle analyses — including work presented at the National Asphalt Pavement Association — show ACE XP™ extends time between maintenance intervals by at least 20%, corresponding to an approximately 10% reduction in Global Warming Potential across a single cycle. Compound that across the full service life of the pavement and total environmental impact reductions can exceed 50%.
Think of it as a 1% premium that buys a 50%+ discount on the life of the asset. There aren't many other line items in pavement design with that kind of asymmetry.
Here's the part that's easy to miss: A1–A5 lifecycle phases — the production stages — account for less than 10% of a pavement asset's total environmental impact.
The other 90%+ sits downstream in maintenance, rehabilitation, and reconstruction. So the most efficient sustainability lever isn't shaving grams out of the mix. It's making the pavement last longer between interventions. Every avoided overlay cycle eliminates virgin aggregate, fresh binder, plant production energy, hauling, paving operations, traffic management, and user-side emissions from delay and detour.
That is exactly what aramid fiber reinforcement does. It improves fatigue resistance, increases tensile strength, and resists rutting and reflective cracking — and the field data backing those claims now spans more than a decade across millions of tonnes of placed material.
Beyond service-life extension, the iNFORCE report flags two environmental benefits that often go unaccounted for in early-stage sustainability comparisons:
Higher RAP content. Aramid fiber's mechanical interlock provides extra tensile strength and resistance to lateral flow, allowing mix designers to push reclaimed asphalt pavement loadings higher than conventional mixes can tolerate. Every percentage point of RAP added is virgin aggregate, virgin binder, and the upstream emissions of both that don't enter the project.
Reduced reliance on polymer-modified binders. SBS polymer carries a cradle-to-gate footprint of 5–10 kg CO₂e per kilogram, plus the high-temperature blending, hot storage, continuous agitation to prevent phase separation, and transportation overhead required to keep the modified binder workable. Aramid fiber avoids that entire emissions chain. In many performance applications, ACE XP™ can replace or substantially reduce the polymer modification dose required.
These are not theoretical lever pulls. They are routinely modeled in agency lifecycle comparisons, and they reinforce the same direction the headline numbers point.
A fair and increasingly common procurement question: Is this just adding microplastics to our roads?
The answer is no, and the reasoning is grounded in both definitions and material behavior:
Compare that to thermoplastic polymer modifiers in conventional bitumen, which sit directly at the wear surface and are progressively released into the environment as the surface course weathers — typically beginning within the first 60 days of trafficking. Aramid fiber, by contrast, has no viable leaching mechanism and over a decade of international field service has produced no ecosystem release findings.
When an ACE XP™-reinforced pavement reaches end of life, it recycles through the same processes as conventional asphalt. Crucially, the ductile 38 mm fiber doesn't shatter during milling the way fiberglass and some grid systems do. The fiber stays bound within the reclaimed asphalt pavement (RAP) and goes back into the next mix with no special handling, no equipment modification, and no documented performance penalty.
This is a meaningful contrast with reinforcing grid systems. Several published grid EPDs show negative end-of-life carbon values — which sounds impressive until you read the footnotes. Those values typically represent EN 15804 Module D accounting credits for theoretical energy recovery, not actual recycling. The same EPDs often acknowledge that mechanical recycling "may not be possible due to bitumen coating" and that "some material may be removed and incinerated."
Negative carbon on a spreadsheet is not the same as material that actually re-enters the supply chain. ACE XP™ does the latter.
The procurement environment has shifted faster than many sustainability frameworks have caught up to. Federal infrastructure programs, state DOT low-carbon specifications, and international tenders now routinely require Environmental Product Declarations, lifecycle carbon accounting, and quantified environmental claims — not marketing language.
For agencies and contractors operating in that environment, aramid fiber reinforcement offers four practical advantages:
A 1% upfront carbon premium that delivers 20%+ longer maintenance intervals, 10% lower per-cycle GWP, and the potential for 50%+ whole-of-life carbon reduction is not an incremental sustainability play. It is the kind of lever that changes the economics of long-life pavement design.
That's why DOTs, municipalities, airports, and private owners across North America continue to specify Surface-Tech aramid fiber technology — and why the case for it gets stronger every year that the field data extends.
Download & Read the full iNFORCE technical report: Environmental Impact of Aramid Fibers in Asphalt and End-of-Life Considerations
https://surfacetech.ai/file-manager/files/5e314647-2a9f-48b2-845d-3f93993c0a70/download
For technical sales support, EPD documentation, or to discuss specifying ACE XP™ on your next project, contact the Surface-Tech team.
Surface-Tech LLC is a California–based manufacturer of aramid fiber-reinforced asphalt technologies including ACE XP™, VALOR™, REARM™, ARMI™, and ASTRA™. Surface-Tech products are used by departments of transportation, municipalities, airports, and private infrastructure owners across North America and globally.