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02772aam a2200385Ia 4500 001 D07F77C8493111E49277FB87DAD10320 003 SILO 005 20141001010218 008 081028s2008 iaua s000 0 eng d 035 $a (OCoLC)263979324 040 $a UIG $c UIG $d TDG $d IOZ $d SILO 043 $a n-us-ia 245 00 $a Design guide for improved quality of roadway subgrades and subbases / $c by Vernon R. Schaefer, ... [et al.] 260 $a Ames, Iowa : $b Center for Transportation Research and Education, Iowa State University, $c 2008. 300 $a 1 v. (various pagings) : $b ill. (some col.) ; $c 28 cm. 500 $a "September 2008." 504 $a Includes bibliographical references. 513 $a Final report. 520 $a The performance of a pavement depends on the quality of its subgrade 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 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. 530 $a Also available via the Internet at: http://www.ctre.iastate.edu/reports/subgrade_subbase_tr525.pdf 536 $a Sponsored by the Iowa Highway Research Board $f CTRE project 04-186 $f CTRE project 04-186 530 $a Also available on the Internet at: 650 0 $a Roads $z Iowa $x Design and construction. 650 0 $a Embankments. $9 8677 650 0 $a Drainage. $9 8352 700 1 $a Schaefer, Vernon R. $9 52704 710 1 $a Iowa. $b Highway Research Board. 710 2 $a Iowa State University. $b Center for Transportation Research and Education. 856 41 $z Connect to the online version of this report on the CTRE Web site at: $u http://www.ctre.iastate.edu/reports/subgrade_subbase_tr525.pdf 941 $a 3 952 $l IAOX771 $d 20221029020626.0 952 $l OVUX522 $d 20180119041814.0 952 $l USUX851 $d 20160824082032.0 956 $a http://locator.silo.lib.ia.us/search.cgi?index_0=id&term_0=D07F77C8493111E49277FB87DAD10320 994 $a C0 $b IOZInitiate Another SILO Locator Search