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• . It-�� <br />Da4go of Pavamesr S&uc1z rs <br />Once a desip structural ausuber is selected. it is up to <br />High 700.000 to LOW.000 <br />' the user to identify an appropriate combination of <br />Medium 400,000 to 600,000 <br />flexible pavement layer thicknesses which will provide <br />Low 30.000 to 300,000 <br />the desired load - carrying capacity. This may be ac. <br />- . 1 <br />cc. cr : :s.ed using the arivaa for layer coetliciorts la <br />(9) The Iev els of roadbed soil quality and eor. <br />va:ucaf pm=ttd in Section 2..3.5 and the teneral <br />responding ranges of effective modulus of <br />equation for strrcxtual number. .' <br />subgrade =x1on (k value) ate. <br />S} = a,D + s a <br />Very Good r greater tbaa 550 pci <br />Good 400• to 550 Pei <br />s. , a-.. a - layer eovffiteient for surface: base. <br />Fair 250 to' 350 pa <br />and subbpmsc =ate:ix1s•rcspm- <br />Poor . 00 to 250pci <br />Dvely, and <br />Very Poor ; less than 150 pea ' <br />D D�. D = dickness (ita ice) of surfs, base, <br />It <br />It should be noted that �ishotRsh the �:ai tts�t slab <br />at d subbase respectively. <br />shown is S inches. the user should consider <br />the use of a tbieker slab since as overloaded truck tray, ' <br />to scan cases, severely damage thin slab pavement:, <br />4= Mod Parauest Datp Cauiop <br />a <br />es y S :rd ':9 the pc <br />T ales •YYYY <br />1 .i ,. L�•••. L�7! <br />. <br />GC"r8. "' - :.'SS • 3 1 t�traybeus�.or <br />4.2.3 /►_gg[egstibCltisC2'Rcad I3e�grt c <br />: 4. • r ....:: r':' 't'• • : • \' .�� :" ..'...' v,.. <br />.s. Wtum .: he =Ar- <br />•: �J <br />Tebx <.i0pi� ara�og <br />4.8 i1 <br />_ <br />serQrt st.t? ;..-- zit = .ssg det�tl..nd - fable 4.9 is <br />valz: �eza�adfi.vssGa:brsaare�esailedd '' '' <br />'• <br />based a n a 1 rte" Lv LIbe acer�r! xpdo inheea: <br />; ; .i� ? <br />• 12 not gsossibbe Zhu stsbaased -an • • • <br />• fcilassa M <br />,, :. <br />spec s 3:: astgexa+!:&] cipES :tllagg3icat�ctntat,zi�fi�t'. . - <br />• <br />• • <br />'Tr =r==d or coat=s <br />l -vela: :. ' * '� • • ~ <br />_, :; : ' ^ <br />:. .:.,a <br />• t. • <br />• .. <br />L /t /� ��/ <br />•• 't7 1 ' •• ..' F 60,000 to 100,000 • . ,•• r^ • ' <br />Hi <br />(Z) Slab tbidmc dtsign recommendations <br />30,000 to '60,000 ;' <br />rply to all sic U-S. climatic regions. <br />LOW 10.000 : a 30,000 <br />Subbase is 6lnches of htigh quality gmaular <br />One other ammption inherent is these base thick. <br />subbass (Far -wry good subgrade and. low <br />ness recommendations is that the effectfm resilient : <br />traf;i4 this lay= may be ommltted). <br />modulus of the aggregate base material is 30,000 psi, <br />regardless of the quality of the roadbed soil. This value . <br />(4) Mean PCC modulus of rupture (S ,) is 600 <br />should be used as input to the nomograph In Figure 4.5 <br />to convert a portion of the aWvpte base thickness to <br />Fu <br />an equivalent thickness of subbase material with an <br />V) Me= PCC elastic modulus (E)is5,000,000 <br />intermediate modulus value between the base and <br />PSL <br />roadbed soil. <br />(V r ;-M are no tied cpncrete shoulders (or <br />rcrbs) required. <br />1 teenage ftaoats:se! conditions are fair (C,. <br />Lt? :.: lS-+►ia ESAL traffic lcvc!s ar: <br />nut 'uoiirim ssw siana ujoisou <br />WJAI :I onn7 •n7 •Jpw <br />REVISED JULY 2006 Attachment 2.05.3(3) -8 -24 <br />