Pavement Preservation - carbon footprint
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This document discusses the environmental impacts of asphalt road construction and maintenance. It notes that refining oil and manufacturing asphalt release large amounts of greenhouse gases and other pollutants. It also depletes aggregate resources. The document promotes the use of Reclamite, a pavement preservative sealant that can extend the life of roads, requiring fewer overlays that use additional raw materials and fuel. Reclamite has a lower carbon footprint than traditional overlays since it is applied in a simple process using existing roads and can postpone more intensive rehabilitation. It also improves pavement performance characteristics like skid resistance and reduces the need for winter road chemicals.
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Pavement Preservation - carbon footprint
- 1. OUR CARBON FOOTPRINT... ... OUR JOINT RESPONSIBILITY
- 2. The asphalt we use in the road industry is a by-product of oil refining. Highway 401
- 3. Paving roads is the best use of this by- product.
- 4. Refining oil releases massive amounts of detrimental carbon gases into the earth’s atmosphere.
- 5. Manufacturing asphalt depletes our valuable and limited aggregate resources.
- 6. The Environment Canada website includes information on the environmental impacts of asphalt manufacturing. It lists…
- 7. …5 Criteria Air Contaminants (Particulate, Nitrogen Oxides, Sulphur Oxides, Carbon Monoxide, Volatile Organic Compounds) 2 Toxic Substances (Polycyclic Aromatic Hydrocarbons, Heavy Metals)
- 8. …and Greenhouse Gas (Carbon Dioxide)
- 9. Even with lower temperature mixes, there are huge environmental and human health risks. Warm mix project
- 10. Hot mix plants are required to shut down operations on designated “smog alert” days in populated areas. Toronto “smog alert” day
- 11. British Columbia has already implemented a Carbon Tax which is applied against every tonne of asphalt produced.
- 12. Also in BC, every litre of gasoline and diesel fuel is being levied a carbon tax. Revenue Canada
- 13. Tremendous strides have been taken to encourage recycling technologies such as Cold- in-Place and Expanded Asphalt.
- 14. These technologies reduce aggregate depletion, but still require huge carbon outputs including new hot mix asphalt for a final driving surface.
- 15. Polymer additives improve asphalt performance and allow for higher percentages of recycled asphalt content in the mix, however… Polymer structure model
- 16. …heating these complex synthetic molecular polymers in asphalt plants creates a whole new set of environmental and health risks.
- 17. Aggregate extraction affects local water resources, air quality and wildlife habitat.
- 18. It also contributes to noise pollution and traffic. Extraction equipment and trucks add significant carbon to the atmosphere.
- 19. Once asphalt is manufactured it must be trucked to the jobsite, placed and compacted with heavy carbon producing equipment.
- 20. The auto industry is experiencing a revolution in improving the fuel economy of vehicles in efforts to reduce green house gas emissions for each kilometre travelled.
- 21. Tire manufacturers are introducing improved “low rolling resistance” tires which improve fuel economy when driving on smooth roads. All major tire manufacturers “Between 1.5% and 4.5% are developing of total fuel use could be and introducing saved if all replacement low rolling tires had low rolling resistance tires. resistance” Many now Source: Transport Canada indicate how many kilometres worth of fuel are saved during the use of the tire over the lifetime compared with a standard tire.
- 22. Adding pavement texture contributes to higher fuel consumption and the associated greenhouse gases, negates the efforts of low rolling resistance tires, adds needless tire wear and the associated replacement and disposal costs, and creates needless noise pollution. Increase pavement texture only in areas where there is a high vehicle accident risk. This is a legitimate trade-off for fuel economy. (eg. slurry or micro on high speed curves, descending steep grades requiring vehicles to stop at the bottom, and filling wheel ruts)
- 24. The longer a high-class bituminous surface can be kept in good condition, the larger the fuel savings and lower the carbon emissions per each kilometre of road. Smooth roads = better fuel economy Better fuel economy = lower emissions
- 25. Technology exists to improve the carbon footprint of a road system and lower the lifecycle costs at the same time.
- 26. Selection decisions for pavement preservation technologies must be made based on life cycle economics and environmental considerations. Cost effective in-depth seal application
- 27. Reclamite® In-Depth Preservative Seal is the best choice based on life cycle savings and environmental benefits. Computerized spray truck applicator
- 28. Reclamite® In Depth Preservative Seals are applied in a simple 3-step process on new pavement (construction seal), or to add additional life to older pavements (maintenance seal) The process takes just minutes to complete.
- 29. STEP #1 The asphalt is sprayed with Reclamite® using a computerized spray truck applicator. The Reclamite® penetrates into the pavement to create a seal in-depth that cannot be worn off by traffic.
- 30. STEP #2 When the Reclamite® has penetrated the asphalt, a thin layer of sand is applied to prevent tracking of the sealer. The street is then immediately opened to traffic.
- 31. STEP #3 The day following the application, the sand is swept up to be reused on another street, and all remaining signage is removed from the project.
- 32. Reclamite® cures in the asphalt creating a more durable and longer lasting pavement adding many years beyond the pavement’s natural lifecycle. A completed Reclamite® project
- 33. Engineer taking cores for viscosity testing With a sixteen year history of use in Ontario, it has had extensive trial, assessment, and laboratory testing to prove its ability to cost- effectively extend the life of asphalt.
- 34. Reclamite applied in 2002 This picture taken in 2012 Limit of 8 foot wide “control” section left untreated in 2002 Cracking occurred in the untreated section.
- 35. Engineer testing skid resistance This testing includes viscosity, sorptivity or permeability, and skid resistance.
- 36. Untreated and “open” Treated and “tight”
- 37. Engineer utilizes a non-destructive method of sorptivity testing The testing done in Ontario supports the findings of other jurisdictions around the world over the last 5 decades.
- 38. Testing is done utilizing the Strategic Highway Research Program protocol, such as rheological testing using the Bending Beam Rheometer test and the Dynamic Shear Rheometer test. The results have proven the excellent aging properties of treated pavements.
- 39. Reclamite® is the most cost-effective pavement preservation product available.
- 40. Reclamite® is a non-toxic, cold-applied, low carbon process that adds many years of additional life to your asphalt surfaces.
- 41. Reclamite® postpones overlays and the need for other high-carbon, high-aggregate rehabilitation processes. The “Fountain Of Youth” for your roads.
- 42. Both grades of Reclamite® contain the maltene components of asphalt cement that have been enhancing pavement performance for over 50 years.
- 43. Warm Mix Asphalts In order to make asphalt flow at lower temperatures for reduced greenhouse gas emissions, the asphalt producer must place additives into the asphalt mix. Products such as Sasobit, Hyper-therm, Aspha- min, Zeolite, Evotherm DAT, Lea, Rediset WMX, Revix, or simply injecting water into the liquid AC causing rapid AC expansion/foaming, all create asphalt with reduced emissions.
- 44. These additives (even the water/rapid foam expansion method) upset the delicate balance of the five asphalt cement components that determines the asphalt performance ratio. This is why some Warm Mix projects exhibit a premature “drying” of the mix just weeks after placing the mix. PC + A1 S + A2
- 45. The Reclamite® formulation rebalances the performance parameters of warm mix asphalts, thus extending the service life of the pavement. Even the tracking marks are rejuvenating and sealing the dry open warm mix. Untreated Warm Mix side-by-side sealing/rejuvenation comparison trial. Treated
- 46. Application trucks are not required to be placarded (Reclamite® is non-toxic), however, all municipal catch basin drains are covered with absorbent “spills kit” covers.
- 47. A Reclamite® application does not deplete any natural aggregate resources because...
- 48. …a premium manufactured sand is used (which would otherwise be landfill waste from the steel industry).
- 49. This sand performs excellent and is reused several times before the municipalities use it again for municipal projects. Sand that was used on 4 different Reclamite® street jobs has now become a walking/bike path.
- 50. Reduced Winter Chemical Requirements
- 51. Pavements treated with Reclamite® require less salt to break the bond between snow/ice and pavement.
- 52. Similarly, anti-icing chemical requirements on treated pavements can be reduced and still achieve the same results.
- 53. All winter chemicals eventually end up in our streams and lakes.
- 54. Municipal test section showing salt residue unsealed sealed The resulting in-depth seal reduces the permeability of the asphalt. This will prevent loss of fines, and will result in a reduction of anti icing chemical needed to achieve results.
- 55. Reclamite® is the only pavement preservation product that improves the quality of watercourses by reducing winter chemical requirements.
- 56. ENVIRONMENTAL BENEFITS Longer lasting asphalt = reduced carbon Low impact process = reduced carbon No natural aggregate depletion On-site multiple reuse of traction grit Non toxic emulsion No solvents Reduced winter chemical needs Does not diminish the benefits of low rolling resistance tires
- 57. Should a road manager use pavement preservation products that consume high- carbon, and deplete aggregate resources, if better choices are available? What choice would this little girl want you to make for her future?
- 58. OUR CARBON FOOTPRINT... ... OUR JOINT RESPONSIBILITY
- 59. THANK YOU “green technologies for modern road managers” Superior Road Products