Design Guide for Improved Quality of Roadway Subgrades and Subbases, TR-525, 2008

(2008) Design Guide for Improved Quality of Roadway Subgrades and Subbases, TR-525, 2008. Transportation, Department of


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TR-525 SUDAS Tech Brief.pdf

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The performance of a pavement depends on the quality of its subgrade and subbase layers; these foundational layers play a key role in mitigating the effects of climate and the stresses generated by traffic. Therefore, building a stable subgrade and a properly drained subbase is vital for constructing an effective and long lasting pavement system. This manual has been developed to help Iowa highway engineers improve the design, construction, and testing of a pavement system’s subgrade and subbase layers, thereby extending pavement life. The manual synthesizes current and previous research conducted in Iowa and other states into a practical geotechnical design guide [proposed as Chapter 6 of the Statewide Urban Design and Specifications (SUDAS) Design Manual] and construction specifications (proposed as Section 2010 of the SUDAS Standard Specifications) for subgrades and subbases. Topics covered include the important characteristics of Iowa soils, the key parameters and field properties of optimum foundations, embankment construction, geotechnical treatments, drainage systems, and field testing tools, among others.

Item Type: Departmental Report
Keywords: Drainage, Drainage structures, Embankments, Embankment foundations, Foundation engineering, Geotechnical engineering, Pavement layers, Subbase (Pavements), Subgrade (Pavements), Subsurface drainage
Subjects: Transportation
Transportation > Roads and highways
Transportation > Research
Transportation > Design and Construction
ID Code: 19978
Deposited By: Iowa DOT Library
Deposited On: 30 Jun 2015 11:51
Last Modified: 22 Jan 2018 15:17