Santa Clara River Trail Final Master Plan - Development Services ...

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Chapter 6: Design Guidelines, Maintenance Schedules and Best Practices Asphalt Asphalt is the most common surface treatment for multi-use paths. The material composition and construction methods used can significantly affect the longevity of the pathway. Thicker asphalt sections and a well-prepared subgrade will reduce deformation over time and reduce long-term maintenance costs. Asphalt is suitable for a wide variety of trail users and is less jarring on people’s joints than concrete. Figure 7 shows a typical section of an asphalt trail. Figure 7. Asphalt Trail Cross-Section The edges of asphalt often crumble over time, and the material is prone to cracking, doming, heaving, and settling. To improve the lifespan of the trail, provide an adequate pavement structural section to support the maintenance vehicles that will be using the trail. Based on observations and analysis of similar existing asphalt paths, the pavement surfacing will need an overlay or extensive replacement and renovation every 15 to 20 years. However, this extensive replacement could be mitigated and the expense reduced with preventative maintenance measures such as chip-sealing every five to eight years. Chip seal is not recommended for use near the river due to the potential for excess oil to be washed off the surface. Deteriorated sections are easier to remove and replace than concrete. Use of Recycled Materials in Asphalt 5 Asphalt typically used for a paved trail can be composed of recycled materials that otherwise would end up in a landfill in-lieu of new base material. This reuse of materials reduces hauling-related energy consumption and construction waste management. These materials include: Glassphalt: A mixture of traditional asphalt and recycled glass. The glass is used to replace some of the sand that would otherwise be found in asphalt. Glassphalt can be installed using the same equipment and procedures as conventional asphalt. Reclaimed Asphalt Pavement (RAP): RAP can be used as an aggregate in the hot recycling of asphalt paving mixtures. RAP is routinely accepted in asphalt paving mixtures as an aggregate substitute and as a portion of the binder in nearly all 50 states. Substitution rates of 10 to 50 percent or more, depending on state specifications, are normally introduced in pavements, and 5 Bondurant, Julie and Thompson, Laura. (2009). Trail Planning in California Communities. 74 | Alta Planning + Design
Santa Clara River Trail Plan recently developed technology has even made it possible to recycle 90 to 100 percent RAP in hot mix. http:// www.fh wa.dot.gov/pavement/recycling/rap/index.cfm Rubberized Asphalt Concrete (RAC): Also known as asphalt rubber hot mix, uses crumb rubber from scrap tires. Below is a list of the benefits of rubberized asphalt according to the Rubberized Asphalt Concrete Technology Center,6 RAC: 1. Can save as much as $22,000 per mile of trail (or one lane of roadway) over conventional asphalt when resurfacing with a two-inch-thick layer 2. Is highly skid-resistant, quieter, and resists shoving and rutting when a gap-graded mix is used 3. Provides excellent, long-lasting color contrast for striping and marking 4. Resists reflective cracking 5. Uses approximately 2,000 waste tires per trail mile (or one lane of roadway) for a two-inch resurfacing project Use of Pervious Asphalt Similar in appearance to traditional asphalt, pervious asphalt allows rain to seep through the surface, reducing run-off. Trails that are along bodies of water or that may have flooding problems should consider using this surface. Regions that receive a lot of rain, and a small amount of snow in the winter are good places for pervious-surface asphalt. It is less successful in regions that receive a lot of snow and ice during the winter months as the asphalt tends to crack, similar to normal pavement. Figure 8. Asphalt Trail Surface Figure 9. Permeable Asphalt Trail Surface Path Surfacing Options Analysis The surfacing material of a path contributes to the overall feel of the trail and can affect which users can comfortably utilize the trail. Whether or not a trail is paved can encourage or deter neighborhood support for the trail, if they consider a paved trail to be an invitation for outsiders to pass through their community, or if they have safety or aesthetic concerns about an unpaved trail. The selection of trail 6 Source: www.rubbe rizedasphaILorgJindex.hlm City of Oxnard | 75
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