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  • Pathways | Washington Asphalt Pavement Association
    surface Figure 1 Burke Gillman Trail in Seattle Figure 2 Myrtle Edwards Park in Seattle Assumed Traffic Bicycles golf carts pedestrians rollerbladers skateboarders etc The pavement is not intended to withstand repeated vehicle loading but the occasional maintenance light truck can be accommodated without undue damage Design Considerations Bicyclists pedestrians and rollerbladers tend to like an extremely smooth pavement Nominal maximum aggregate sizes larger than about 0 5 inches are noticeably rough to rollerbladers and skateboarders Path widths less than 8 ft require smaller equipment and more labor to pave The narrowest commonly available paver uses an 8 ft wide screed Paving widths less than 8 ft require screed and auger adjustments and significantly more labor resulting in a higher cost per ton of HMA placed If there is room an 8 ft wide path can be constructed at a lower cost per square yard than a 5 ft wide path in the same location Design paths with a minimum slope of 2 percent 0 25 inches per foot Slopes less than this are difficult to construct and may not prevent pooling of water during wet weather Construction Considerations Because a smooth pavement is essential for user satisfaction and safety special care should be taken to ensure roots from nearby trees are not growing directly below the intended path location If left in place these roots may cause local pavement upheavals which can be a safety hazard Areas that show a pronounced deflection under heavy construction traffic indicate instability in the subgrade Such areas probably require removal of the material and replacement with suitable subgrade soil material such as crushed stone or gravel borrow Where there is the possibility of recurrent vegetation growth a quality commercial grade herbicide should be used Recommended References American Association of State Highway and Transportation

    Original URL path: http://www.asphaltwa.com/2010/09/17/pathways/ (2016-04-26)
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  • Recreational Facilities | Washington Asphalt Pavement Association
    rough Playgrounds and athletic courts can be finished with a commercially manufactured slurry seal to provide a smooth playing surface Construction Considerations Recreational facilities should be compacted to a minimum of 90 percent TMD Rice density Lower levels of compaction may result in driveways that will significantly compact under the occasional vehicle load or scuff easily Because a smooth pavement is essential for user satisfaction and safety special care should be taken to ensure roots from nearby trees are not growing directly below the intended path location If left in place these roots may cause local pavement upheavals which can be a safety hazard Proper drainage is critical especially for athletic courts Even minor pooling of water can render a court unplayable In order to drain properly they should have a minimum slope of about 0 5 percent 1 inch per 10 feet on a true plane from side to side end to end or corner to corner Generally there should not be a grade break in the middle of the court Areas that show a pronounced deflection under heavy construction traffic indicate instability in the subgrade Such areas probably require removal of the material and replacement with suitable subgrade soil material such as crushed stone or gravel borrow For courts and playgrounds an edging of brick concrete or treated lumber should be installed around the entire perimeter The edging s top elevation should be 0 5 inches below the finished grade level and the surface should be tapered from 6 inches from the edge to meet it Where there is the possibility of recurrent vegetation growth a quality commercial grade herbicide should be used Courts can be finished in color see Figure 1 Before color finishing it may be prudent to conduct a water check to determine if there

    Original URL path: http://www.asphaltwa.com/2010/09/17/recreational-facilities-2/ (2016-04-26)
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  • Heavy Industrial Facilities | Washington Asphalt Pavement Association
    owner incurs a financial loss for the duration of the paving project Unlike rigid pavements which may take from several days to several weeks to construct a flexible pavement can usually be constructed in one working day or less thus minimizing the facility down time Figure 1 Port of Tacoma Figure 2 Port of Seattle Assumed Traffic Traffic for these types of facilities cannot be assumed A methodical and reasonably accurate estimation of the type and number of loads is essential in determining the proper pavement structural design mix type and mix design Sometimes intended industrial traffic is well beyond legal load limits for Washington State highways such as in a logging facility Design Considerations The types and number of loads can vary widely requiring widely varying designs Industrial applications often require heavy duty mixes to ensure resistance to loading such as tracked vehicles stacked containers stationary turning operations and abrasive forces A heavy duty mix is a dense graded mix containing large nominal maximum aggregate sizes usually between 0 75 and 1 5 inches NAPA 2002 0 75 inch or larger Superpave or large stone crushed aggregate ATB can be used as a heavy duty mix Heavy duty mixes provide for superior load carrying characteristics due to the improved aggregate interlock of the paving mixture matrix Because of the reduced surface area of the mix the percentage of liquid asphalt cement is lower in these mixes providing a very good value and very tough mixes The final few lifts of a heavy load paving design should still utilize a dense graded Superpave for proper sealing and a tight surface texture for the final product Polymer modified asphalt binders can also be incorporated in heavy load applications to further increase the pavement structure s load carrying capacity Construction Considerations There

    Original URL path: http://www.asphaltwa.com/2010/09/17/heavy-industrial-facilities-2/ (2016-04-26)
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  • Airfields | Washington Asphalt Pavement Association
    is a durable high strength pavement materials that is entirely appropriate for airfields In fact over 90 percent of the paved airfields in the U S are paved with HMA Figure 1 Friday Harbor Airport Figure 2 King County Airport Assumed Traffic Airplanes A methodical and reasonably accurate estimation of the type and number of airplanes is essential in determining the proper pavement structural design As with vehicular roads heavy loads e g jet liners cargo planes will control the design Design Considerations Airfield pavement design is dominated by the Federal Aviation Administration FAA The FAA has its own pavement specifications and design considerations Construction Considerations Airfield pavement construction can be markedly different than vehicular roadway construction Although these differences are too numerous to list here it should be noted that FAA compaction requirements are typically more stringent than State DOT city or county requirements This is because HMA paving by the FAA is generally intended for airport pavements which experience less traffic and have different operating requirements e g up to 60 000 lb wheel loads grooving and rubber removal Rapol 2001 Generally the FAA believes its aircraft pavements need 1 to 1 5 percent more initial density than

    Original URL path: http://www.asphaltwa.com/2010/09/17/airfields-2/ (2016-04-26)
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  • Site Paving | Washington Asphalt Pavement Association
    but not limited to shopping centers schools manufacturing facilities warehouses and roads Paving a building site prior to completion of construction has several benefits WAPA Pavement Note on Site Paving When the Boeing Everett plant was being constructed one of the first steps was to pave the entire site with ATB to allow construction to continue in bad weather In 1966 67 over 200 000 tons of ATB was placed Uniform all weather surface on which construction can be performed in bad weather A layer of ATB can be placed during the beginning stages of site work to serve as a working platform that stays relatively dry and deformation free during construction For example a school parking lot might be graded and paved with ATB in advance of building construction so that construction material and equipment can be stored on the ATB surface for easy all weather accessibility After construction is complete the ATB can be repaired and paved over with a final surface course Eliminates the need for costly select material The ATB subfloor ensures a floor slab that is dry and waterproof Reduces erection and storage costs A smooth unyielding surface even in inclement weather results in greater crane forklift and hoist mobility The ATB pavement acts as an ideal materials storage pad helping to keep building materials clean organized and out of the mud or dust of the season Reduces grading cost and time Using ATB the site need only be graded once just before the ATB is placed Without site paving areas of heavy construction traffic may need to be periodically graded Reduces control point disturbances Surveyors can set nails in the ATB as vertical and horizontal control points The firm ATB reduces the risk of loss or disturbance during construction Reduces erosion Site paving covers

    Original URL path: http://www.asphaltwa.com/2010/09/17/site-paving-2/ (2016-04-26)
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  • Awards Overview | Washington Asphalt Pavement Association
    WSDOT awards are selected by WSDOT and nominated by each Region based upon a rating system that includes among other things ride pay factor and project complexity The projects are then further evaluated by a special WAPA WSDOT committee that visits each project to closely judge the final product WAPA APWA WA BEST CITY PAVING PROJECT AWARDS City awards sponsored jointly by WAPA and the American Public Works Association APWA are given to the best City paving projects in the State one east of the Cascades and one west of the Cascades They are nominated by Cities and chosen by a special WAPA evaluation committee WAPA WACE BEST COUNTY PAVING PROJECT AWARDS County awards sponsored jointly by WAPA and the Washington Association of County Engineers are given to the best County paving projects in the State one east of the Cascades and one west of the Cascades They are nominated by Counties and chosen by a special WAPA evaluation committee COMMERCIAL PAVING AWARDS This award sponsored by WAPA is given to the outstanding paving project constructed for a private owner Candidates are nominated by WAPA members and the winner is chosen by a special WAPA evaluation committee AIRPORT PAVING AWARDS

    Original URL path: http://www.asphaltwa.com/2010/11/16/awards-overview/ (2016-04-26)
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  • How To Apply | Washington Asphalt Pavement Association
    Surface Distressess Maintenance and Rehab Design Catalog Residential Streets Collector Streets Rural Roads Arterials Highways Parking Lots Residential Driveways Pathways Recreational Facilities Heavy Industrial Facilities Airfields Site Paving Awards Winners How To Apply Calendar Industry Events WAPA Events Home How To Apply How To Apply How To Apply Each year WAPA WSDOT the American Public Works Association and the Washington Association of County Engineers award those paving projects judged to

    Original URL path: http://www.asphaltwa.com/2010/11/16/how-to-apply-2/ (2016-04-26)
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  • Diamond Awards | Washington Asphalt Pavement Association
    three commendations below provide a blueprint for excellence in all aspects of the industry s operations both at the plant and on the paving site Diamond Paving Recognizes companies whose paving crews demonstrate best practices that result in excellent product quality and ensure safety through proper training and compliance for supervisors and crew members and demonstrated use of best practices in paving Diamond Achievement Recognizes asphalt plants and facilities that

    Original URL path: http://www.asphaltwa.com/2010/11/15/diamond-awards/ (2016-04-26)
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