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  • admin | Washington Asphalt Pavement Association
    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 used to resurface an existing pavement or pulverize an existing pavement for use as base material Read More Pavement Types Hard surfaced pavements which make up about 67 percent of U S roads and 70 percent of Washington State roads are typically categorized into flexible and rigid pavements Flexible pavements Those which are surfaced with bituminous or asphalt materials These types of pavements are called flexible since the total pavement structure bends or deflects due to traffic loads A flexible pavement structure is generally composed of several layers of materials which can accommodate this flexing Rigid pavements Those which are surfaced with portland cement concrete PCC These types of pavements are called rigid because they are substantially stiffer than flexible

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  • Washington Asphalt Pavement Association |
    Pavement Facts Posted by admin on Sep 18 2010 There are over 4 05 million public centerline road miles 8 52 million lane miles in the U S and of this 2 50 million miles or 63 percent are paved FHWA 2009 About 70 percent of Washington State roads are paved Pavement Purpose Typically pavements are built for three main Read More Member Benefits Posted by admin on Sep 13 2010 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 Read More Previous Next Economics Life Cycle Cost Posted by admin on Sep 15 2010 Today s current national and local economic conditions combining reduced funding with high infrastructure needs have elevated the importance of prudent spending Read More Environment Sustainable Pavement Posted by admin on Sep 13 2010 Asphalt is the sustainable material for constructing pavements From the production of the paving material to the placement of the pavement on the road to rehabilitation through Read More Engineering Perpetual Pavement Posted by admin on

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  • Pavement Guide | Washington Asphalt Pavement Association
    al 1996 Ideally the goal of mix transport should be to maintain mix characteristics between the production facility and the paving site Read More Laydown Mix laydown involves everything used to place the delivered HMA on the desired surface at the desired thickness The asphalt paver is the principal machine involved in mix laydown and is assisted by the material transfer vehicle MTV in some instances best antivirus software for pc Read More Quality Assurance Quality has become one of the most important consumer decision factors in the selecting among competing products and services This is true not only for individual consumers but also for large corporations government organizations and the taxpaying public as a group In its broadest sense quality is a degree of excellence the extent to which something is fit for its purpose In the narrow sense product or service quality is defined as conformance with requirement freedom from defects or contamination or simply a degree of customer satisfaction Read More Specifications Specifications are used 1 to convey information concerning desired products from a buyer to a seller or potential seller 2 as a basis for competitive bidding for the delivery of products and 3 to measure

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  • admin | Washington Asphalt Pavement Association
    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 machinery airplanes can be characterized by tire loads axle and tire configurations load repetition traffic distribution across the pavement and vehicle speed Read More Subgrade The subgrade is the in situ material upon which the pavement structure is placed Although there is a tendency to look at pavement performance in terms of pavement structure and mix design alone the subgrade can often be the overriding factor in pavement performance Read More 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

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  • Washington Asphalt Pavement Association |
    More Pavement Facts Posted by admin on Sep 18 2010 There are over 4 05 million public centerline road miles 8 52 million lane miles in the U S and of this 2 50 million miles or 63 percent are paved FHWA 2009 About 70 percent of Washington State roads are paved Pavement Purpose Typically pavements are built for three main Read More Member Benefits Posted by admin on Sep 13 2010 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 Read More Previous Next Economics Life Cycle Cost Posted by admin on Sep 15 2010 Today s current national and local economic conditions combining reduced funding with high infrastructure needs have elevated the importance of prudent spending Read More Environment Sustainable Pavement Posted by admin on Sep 13 2010 Asphalt is the sustainable material for constructing pavements From the production of the paving material to the placement of the pavement on the road to rehabilitation through Read More Engineering Perpetual Pavement Posted by admin on Sep 13 2010 The Perpetual Pavement concept was first articulated in 2000 and the concept has rapidly gained acceptance The APA s newest technical document on the subject is Perpetual Asphalt Read More Policy Livable Communities Posted by admin on Sep 12 2010 There is no doubt that societal trends and economic realities will shape the pavement market going forward Those driving factors include public funding issues an emphasis on Read More Recent Posts Asphalt Pavement History Hot mix asphalt HMA pavements have existed in their present form as a mixture of angular aggregates and asphalt binder since the

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  • Pavement Guide | Washington Asphalt Pavement Association
    1998 Assessing the Results of the Strategic Highway Research Program Publication No FHWA SA 98 008 Federal Highway Administration Washington D C Northeast Center for Excellence for Pavement Technology NECEPT 2004 Superpave System Web page on the NECEPT web site The Pennsylvania Transportation Institute Pennsylvania State University University Park PA http www superpave psu edu superpave system html Accessed 12 October 2010 National Stone Sand and Gravel Association NSSGA 1991 The Aggregate Handbook National Stone Sand Gravel Association Arlington VA National Stone Sand and Gravel Association NSSGA 2010 What is NSSGA From the NSSGA Web site http nssga org communications whoweare cfm Accessed 12 October 2010 Roberts F L Kandhal P S Brown E R Lee D Y and Kennedy T W 1996 Hot Mix Asphalt Materials Mixture Design and Construction National Asphalt Pavement Association Education Foundation Lanham MD Asphalt Institute 1962 The Asphalt Handbook Manual Series No 4 MS 4 Asphalt Institute Lexington KY Handy R L 1995 The Day the House Fell ASCE Press New York Asphalt Institute 1997 Mix Design Methods for Asphalt Manual Series No 2 MS 02 Asphalt Institute Lexington KY Asphalt Institute 2001 Superpave Mix Design Superpave Series No 2 SP 02 Asphalt Institute Lexington KY Highway Research Board 1961 The AASHO Road Test Report 1 History and Description of the Project Special Report 61A Highway Research Board National Academy of Sciences Washington D C Transportation Research Board TRB 2001 Perpetual Bituminous Pavements Transportation Research Circular No 503 Transportation Research Board National Research Council Washington D C http www asphaltalliance com Transportation Research Board TRB 2000 Hot Mix Asphalt Paving Handbook 2000 Transportation Research Board National Research Council Washington D C Texas Department of Transportation TxDOT 2001 Technical Advisory Proper Use of Tack Coat Technical Advisory 2001 1 Texas Department of Transportation Austin TX Scherocman J A 1984 March Guidelines for Compacting Asphalt Concrete Pavement Better Roads Vol 54 No 3 pp 12 17 Scherocman J A and Martenson E D 1984 Placement of Asphalt Concrete Mixtures Placement and Compaction of Asphalt Mixtures F T Wagner Ed ASTM Special Technical Publication 829 American Society for Testing and Materials Philadelphia PA pp 3 27 Geller M 1984 Compaction Equipment for Asphalt Mixtures Placement and Compaction of Asphalt Mixtures F T Wagner Ed ASTM Special Technical Publication 829 American Society for Testing and Materials Philadelphia PA pp 28 47 Hughes C S 1989 National Cooperative Highway Research Program Synthesis of Highway Practice 152 Compaction of Asphalt Pavement Transportation Research Board National Research Council Washington D C Hughes C S October 1984 Importance of Asphalt Compaction Better Roads Vol 54 No 10 pp 22 24 Bell C A Hicks R G and Wilson J E 1984 Effect of Percent Compaction on Asphalt Mixture Life Placement and Compaction of Asphalt Mixtures F T Wagner Ed ASTM Special Technical Publication 829 American Society for Testing and Materials Philadelphia PA pp 107 130 Williams R C Duncan G and White T D 1996 Hot Mix Asphalt Segregation Measurement and Effects

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  • admin | Washington Asphalt Pavement Association
    on these loads to the next layer below Thus the further down in the pavement structure a particular layer is the less load in terms of force per area it must carry Figure 1 Read More Pavement Response How a pavement responds to applied stresses is the combined result of loading environment subgrade and pavement material characteristics This section presents the typical stresses and deformations experienced by an HMA pavement structure under load Read More Structural Design Methods The goal of structural design is to determine the number material composition and thickness of the different layers within a pavement structure required to accommodate a given loading regime This includes the surface course as well as any underlying base or subbase layers This section is focused on the structural design of new pavement Structural design for rehabilitation is covered in Maintenance Rehabilitation Read More Perpetual Pavements Advancements in milling recycling and HMA technology over the last few decades have created HMA pavements that perform better longer and with lower life cycle costs than was previously possible Today s HMA pavements can be designed to last in perpetuity A Perpetual Pavement is defined as an asphalt pavement designed and built to last

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  • Washington Asphalt Pavement Association |
    with Read More Pavement Facts Posted by admin on Sep 18 2010 There are over 4 05 million public centerline road miles 8 52 million lane miles in the U S and of this 2 50 million miles or 63 percent are paved FHWA 2009 About 70 percent of Washington State roads are paved Pavement Purpose Typically pavements are built for three main Read More Member Benefits Posted by admin on Sep 13 2010 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 Read More Previous Next Economics Life Cycle Cost Posted by admin on Sep 15 2010 Today s current national and local economic conditions combining reduced funding with high infrastructure needs have elevated the importance of prudent spending Read More Environment Sustainable Pavement Posted by admin on Sep 13 2010 Asphalt is the sustainable material for constructing pavements From the production of the paving material to the placement of the pavement on the road to rehabilitation through Read More Engineering Perpetual Pavement Posted by admin on Sep 13 2010 The Perpetual Pavement concept was first articulated in 2000 and the concept has rapidly gained acceptance The APA s newest technical document on the subject is Perpetual Asphalt Read More Policy Livable Communities Posted by admin on Sep 12 2010 There is no doubt that societal trends and economic realities will shape the pavement market going forward Those driving factors include public funding issues an emphasis on Read More Recent Posts HMA Mix Types The most common type of flexible pavement surfacing in the U S is hot mix asphalt HMA Hot mix asphalt

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