Using the CivilWeb AASHTO 1993 Pavement Design Spreadsheet will save the designer hours on every single flexible road design. This allows the designer to optimise the design at a glance, showing exactly how many load repetitions relate to a particular Structural Number. The CivilWeb AASHTO 1993 Pavement Design Spreadsheet also includes a unique design graph showing the total Structural Number required to accommodate any loading conditions. The AASHTO flexible pavement design excel spreadsheet completes the Structural Number calculations instantly, allowing the designer to complete dozens of different design iterations in minutes. The whole process must be repeated several times in order to optimise the thicknesses of each layer and this may need to be repeated to investigate different pavement types. Each layer is given a Structural Number, and the total of the Structural Numbers of each layer in the system must exceed the required Structural Number derived from the loading conditions.Ĭompleting the Structural Number calculations can be tedious, particularly where the loading conditions are uncertain or where the pavement design must be optimised. The AASHTO 1993 method evaluates the structural strength contribution of each layer in the pavement system based on its thickness and stiffness. This takes the form of an overall Structural Number. This empirical equation is used to determine the total structural strength required to resist the proposed traffic loads. The AASHTO 1993 method is based on an empirical equation developed from road performance information gathered from the AASHTO Road Test. Flexible pavement design according to the AASHTO 1993 guide can be very time consuming.
#Aashto 93 pavement design software download pdf
Both books are available as PDF downloads through the NAPA Online Store. Structural Design Guidelines for Porous Asphalt Pavements compliments the previously published Porous Asphalt Pavements for Stormwater Management: Design, Construction and Maintenance Guide.
Design examples are included for full-depth porous asphalt pavement systems with and without an asphalt-treated permeable base, as well as a catalogue of required layer thicknesses for different traffic levels. The book includes guidance on determining structural design input values, calculating minimum layer thicknesses, and limits on effective structural thickness. “This new publication helps pavement designers and agencies apply the widely used and accepted AASHTO methodology to porous asphalt pavements,” Copeland said. Hall, Ph.D., P.E., with the support of the NAPA–SAPA Pavement Economics Committee's Pavement Design Task Group, Structural Design Guidelines for Porous Asphalt Pavements discusses the structural design procedure for porous asphalt and the required inputs using the AASHTO 93 design method. “For most parking lots and light-duty surfaces this may be a reasonable approach, but as public agencies look to use full-depth porous asphalt pavements on roadways a traditional structural design methodology is needed.” “Often the design of porous asphalt pavements is focused on how well the pavement will handle water, not traffic,” said National Asphalt Pavement Association Vice President for Engineering, Research, & Technology Audrey Copeland, Ph.D., P.E. To help ensure these new porous asphalt roadways provide reliable performance under traffic, NAPA has published Structural Design Guidelines for Porous Asphalt Pavements. Porous asphalt pavements are a green infrastructure solution that provides the performance, ease of construction, and functionality of traditional asphalt pavements but with a permeable structure that helps manage stormwater.Ĭommonly used for parking lots and other light-duty applications, full-depth porous asphalt pavements are increasingly being used on roadways as part of efforts to mitigate flooding hazards, reduce hardscape, and improve sustainability.
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