LowEmissionAsphalt-136pg-WhitePaper-May2023

P a g e | 105 Designed to be an economical, yet robust “retrofit” technology for existing transportation infrastructure, PlusTi TM penetrants have been proven to materially reduce vehicular emissions and mitigate the effects of roadway heat sinks (heat islands). We believe agencies can immediately advance for scale their long-term goals 224 to reach net zero carbon emissions with photocatalytic pavement upgrades. Photocatalytic Carbon and Nitrogen Sinks Photocatalytic self-cleaning and “depolluting” materials have been sought after as powerful remediation technology for CO 2 , NOx, and aromatic VOCs in urban areas. A number of various products incorporating TiO 2 have been made commercially available in paving with the aim to improve urban air quality. Historically, these products fell into two categories, each exhibiting intractable hurdles. Many products rely on presenting a thin layer of TiO 2 at the surface of a construction material, which as a technique, has proved to foster poor durability and can significantly alter the properties or performance of the construction material itself. These products are expensive coatings, which wear rapidly and are largely incompatible with traffic. Other products embed the TiO 2 within the construction material itself, namely paints or concrete paste, where the former also exhibits durability constraints while the latter solves for durability but at steep economic prohibitions as they require complete rebuilds of infrastructure. The result of these limitations in the prior art has been the inability to promote sustained in-situ effectiveness as scalable solutions to improve urban air quality leveraging photocatalysis. PlusTi TM was developed specifically to tackle and resolve the durability, compatibility, and financial burdens of historic techniques. By combining TiO 2 with existing and successful pavement preservation formulas, PlusTi TM is a spray-applied penetrant technology designed to quickly permeate the pavement surface to imbed the photocatalytic mineral ratably and durably through the wearing course depth without negatively effecting pavement performance. 224 NAPA: The Road Forward, A Vision for Net Zero Carbon Emissions for the Asphalt Paving Industry , www.asphaltpavement.org/climate .