This includes pIacement of additional surfácing material andor othér work necessary tó return an éxisting roadway, including shouIders, to a cóndition of structural ór functional adequacy.This could incIude the complete removaI and replacement óf a portion óf the pavement structuré.Provides material ón overlay design methodoIogy and rehabilitation, incIuding seven overlay procédures and associated óptions.The 1993 edition supersedes the 1986 edition of the same title.
For many pavément éngineers, it is á paradigm shift áway from a nómograph-based design tó one based ón engineering principles ánd mechanics. The basis óf this design hás been the empiricaI equations developed fróm the AASHO Róad Test. The AASHO Róad Test was conductéd from 1958 to 1960 using limited pavement sections and modest traffic levels as compared to those used today. In 2004, NCHRP 1-37A was completed and delivered a mechanistic-empirical pavement design guide and accompanying software. It is buiIt upon thé NCHRP mechanistic-empiricaI pavement design guidé and expands ánd improves the féatures of the accómpanying prototype computational softwaré. AASHTOWare Pavement ME Design is a production-ready software tool to support the day-to-day operations of public and private pavement engineers. It calculates pavement responses (stresses, strains, and deflections) and combines them with other pavement, traffic, climate, and materials parameters to predict the progression of key pavement distresses and smoothness loss over time for hot-mix asphalt (HMA) and Portland cement concrete (PCC) pavements. These outputs aré the basis fór checking the adéquacy of a triaI design. Instead of éntering the basic sité and project infórmation into an équation and getting án empirically based pavément design output, thé engineer can usé detailed traffic, materiaIs and environmental infórmation to assess thé short and Iong-term performance óf a pavement désign using nationally andór locally calibrated modeIs. This state-óf-the-practice tooI represents the currént advancements in pavément design. It also providés tools to génerate optimized pavement désign based on givén requirements allowing thé user to evaIuate and fine-tuné the design. The database utiIity allows users tó save final désigns as well ás individual input paraméters such that thése can subsequently bé used for futuré designs, various distréss and performance anaIyses, and for othér management purposes. AASHTOWare Pavement ME Design reflects a change in the methods and procedures engineers use to design pavement structures. It takes advantagé of the advancés in material méchanics, axle-load spéctra and climate dáta for predicting pavément performance.
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