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  • Benefits | Washington Asphalt Pavement Association
    Residential Driveways Pathways Recreational Facilities Heavy Industrial Facilities Airfields Site Paving Awards Winners How To Apply Calendar Industry Events WAPA Events Home Benefits Member Benefits As a member of the Washington Asphalt Pavement Association WAPA you will have access to the latest technologies resources and innovations for the industry In addition to networking sessions where you can interact with your counterparts at local and state agencies WAPA plays an active

    Original URL path: http://www.asphaltwa.com/category/2/benefits/ (2016-04-26)
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  • How To Join | Washington Asphalt Pavement Association
    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 Join How To Join Any person firm or corporation engaged in or supplying support services to the asphalt paving industry who is interested in promoting high business standards practices and ethics among those engaged in

    Original URL path: http://www.asphaltwa.com/category/2/how-to-join/ (2016-04-26)
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  • Members | Washington Asphalt Pavement Association
    Driveways Pathways Recreational Facilities Heavy Industrial Facilities Airfields Site Paving Awards Winners How To Apply Calendar Industry Events WAPA Events Home Members Regular Members Regular Members shall be persons firms or corporations who are owners and or operators of Hot Mix Asphalt production facilities that operate within the State of Washington A full listing of active members and their contact information is below Read More Associate Members Associate members are

    Original URL path: http://www.asphaltwa.com/category/2/wapa-members/ (2016-04-26)
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  • Pavement Guide | Washington Asphalt Pavement Association
    roads and beyond write me an essay The first recorded use of asphalt by humans was by the Sumerians around 3 000 B C Statues from that time period used asphalt as a binding substance for inlaying various shells precious stones and pearls Other common ancient asphalt uses were preservation for mummies waterproofing pitch on ship hulls and cementing used to join together bricks in Babylonia Around 1500 A D the Incas of Peru were using a composition similar to modern bituminous macadam to pave parts of their highway system In fact asphalt is mentioned several times in the Book of Genesis Baird 2002 Read More HMA Mix Types The most common type of flexible pavement surfacing in the U S is hot mix asphalt HMA Hot mix asphalt is known by many different names such as hot mix asphalt concrete AC or ACP asphalt blacktop or bitumen For clarity this Guide makes a conscious effort to consistently refer to this material as HMA HMA is distinguished by its design and production methods as described in this Guide and includes traditional dense graded mixes as well as stone matrix asphalt SMA and various open graded HMAs Typically agencies consider other types of asphalt based pavement surfaces such as fog seals slurry seals and BSTs to be maintenance treatments and are therefore covered in the Maintenance Rehabilitation section Reclaimed asphalt pavement RAP is generally considered a material within HMA while forms of in place recycling are considered separately Read More Aggregate Aggregate is a collective term for sand gravel and crushed stone mineral materials in their natural or processed state NSSGA 1991 In 2009 the U S produced nearly 2 billion tons of aggregate at a value of about 17 2 billion Roads and highways constitute31 percent of the total sand

    Original URL path: http://www.asphaltwa.com/category/6/ (2016-04-26)
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  • Pavement Types | Washington Asphalt Pavement Association
    as HMA HMA is distinguished by its design and production methods as described in this Guide and includes traditional dense graded mixes as well as stone matrix asphalt SMA and various open graded HMAs Typically agencies consider other types of asphalt based pavement surfaces such as fog seals slurry seals and BSTs to be maintenance treatments and are therefore covered in the Maintenance Rehabilitation section Reclaimed asphalt pavement RAP is generally considered a material within HMA while forms of in place recycling are considered separately Read More Standard Washington Mixes This section lists the standard HMA mixes used in Washington State Read More Superpave Superpave is an overarching term for the results of the asphalt research portion of the 1987 1993 Strategic Highway Research Program SHRP Superpave consists of 1 an asphalt binder specification 2 an HMA mix design method and 3 HMA tests and performance prediction models Each one of these components is referred to by the term Superpave This section provides a brief overview and background of Superpave Read More Asphalt Treated Base ATB Asphalt treated base ATB is a dense graded HMA with a wide gradation band and lower asphalt content intended for use as a base course ATB costs less than typical HMA mixes because it can be produced with less expensive aggregates and lower percentages of asphalt binder In addition to the site paving benefits ATB can be advantageous because it can provide Read More Recycled HMA HMA is one of the most recycled products in the U S As much as 100 million tons of HMA are milled off roads during resurfacing and widening projects each year Of this amount 80 million tons 80 percent are recycled as reclaimed asphalt pavement RAP Bloomquist et al 1993 Additionally in place recycling techniques can also be

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  • Materials | Washington Asphalt Pavement Association
    Paving Awards Winners How To Apply Calendar Industry Events WAPA Events Home Materials Aggregate Aggregate is a collective term for sand gravel and crushed stone mineral materials in their natural or processed state NSSGA 1991 In 2009 the U S produced nearly 2 billion tons of aggregate at a value of about 17 2 billion Roads and highways constitute31 percent of the total sand stone and gravel market NSSGA 2010

    Original URL path: http://www.asphaltwa.com/category/6/62-wapa-materials/ (2016-04-26)
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  • Design Factors | Washington Asphalt Pavement Association
    Design Factors Drainage Proper drainage is important to ensure a high quality long lived pavement moisture accumulation in any pavement structural layer can cause problems Moisture in the subgrade and aggregate base layer can weaken these materials by increasing pore pressure and reducing the materials resistance to shear Additionally some soils expand when moist causing differential heaving Moisture in the HMA layers can cause stripping because it instead of the asphalt binder will adhere to aggregate particles Read More Environment A pavement must function within its environment The environment can vary greatly across the State at any one time and it can also vary greatly throughout time at any one place Environmental variations can have a significant impact on pavement materials and the underlying subgrade which in turn can drastically affect pavement performance The key environmental parameters of concern are typically temperature frost action and moisture Read More Loads Loads are the vehicle forces exerted on the pavement e g by trucks heavy machinery airplanes Since one of the primary functions of a pavement is load distribution pavement design must account for the expected lifetime traffic loads Loads the vehicle forces exerted on the pavement e g by trucks heavy

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  • Mix Design | Washington Asphalt Pavement Association
    Apply Calendar Industry Events WAPA Events Home Mix Design Mix Design Fundamentals HMA consists of two basic ingredients aggregate and asphalt binder HMA mix design is the process of determining what aggregate to use what asphalt binder to use and what the optimum combination of these two ingredients ought to be There are several different methods used to go about this process of which the Superpave Marshall and Hveem methods

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