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Gr,cc a ces:y : stt•x::::al :_-ce: is s_.._._... a iz up to <br />,ne ~_sc: :~ :.i:a::i;: an ~_=roerate combir.ar,or, of <br />aa:d-.: c::vee.eat!ave_•,:csaases'-vcicawiil;.:ovide <br />the ccvr_d :ead<arr~mz aoac:?. T::IS may be ac- <br />• :,: -p;a;,a_ ~.nrt [.`.:'_awr.a for lave: coei ce^ ; /a;- <br />.-..ucsl presso[:d m Sc _•on _ ~ 5 and :hc ral <br />eeuaaon :or struc:u:ai nua:ber. <br />_ _ ~"; <br />. a, = !aye; ..,_.-c.:nt ,`cr su:fac:, base. <br />- ardsubcasecauae.-.ate^ais.:esoeo- <br />ticcn•, and <br />Dt. D_, D; a thickness ('~ inches) of su::ace, base, <br />aLC SUn015C COUrS C, [CSCe^.:VC!V. <br />a..~ Pi^.d Paremat Desi~ Catalog <br />Ta_:~ a.? a:.d .9 or--• ~•: the ctaiog of pa:-!a:,d <br />c:=- -a~cca: ,.^.chi-^~•n_...._yvice[:=ccf~r <br />__.__ ..a a J 7..~.._ .~._-_tt.T t~ tL' ~:13 : cafe •i.~ G <br />„~<-~ C : 1 , - ...::.L :..'[:. r e uSS'~.7L1D.~: IIl.^.~ +.: <br />i (.) Jc~.:cc - :.lort~arutL;:.~:orcd)conc;re <br />(=) Siab thickac.s desien tr_.:mr:adatiotu <br />a_ piy to ail s::t C.S. ciimacic regions. <br />(_) Subbase is b inches of high cuality grantilar <br />subbase (For •'cry good subgrade and low - <br />trai: ic, this layc; may be ~ta.•-titt:d). <br />(:) ~tcan PCC modulus of rupture (S'c) is 600 <br />psi. <br />(`) \feanPCCelasticmodulus(E_)is5.000,000 <br />psi. <br />(El T::::c are ::o tied cpna::c shauld:a (or <br />mot:: ai) CCCL'::Cd. <br />~~''_:^ _] (mOtS[C r:! Cond:!:J nS 1[: f_L' (C, <br /> <br />Lo,+ SO.Cv0 to ~C4,CC-J <br />(9) T::c Icve!s of :oadt:d soii qu._lity and eor- <br />reseonding ranges ri eiiee:ive .:.modulus of <br />tubcradc r:arion ('i-valucl a:c: <br />Very Good grater char. 5:9 pci <br />Gcod •;00 to S50 pc <br />a:r ~`0 to 350 pd <br />Pc^r 1`0 to v30 pd <br />Vc:~ Poor Icss traa 1S0 pd <br />It should be noted chat alt!:outh the miaimu^t slab <br />[hickness shown is S inches, the uu: should consider <br />the use of a ticker slab sine: an ove:io ded tn:ck tnay, <br />in some cases, severely dam: ge this slab pa•r~•eau <br />3. ;..3 rg~ e's1rSo:+s~ 3nad IIasic~: `-~:1e3 <br />=ac.c4-.0 prc:~sararioa_oia_~e~baziacc- <br />._-.u.eel '=a:.:3F C_'^_.'~.'T :=e ^_~a:(Sf IDw-- . <br />','Cl L`~^.C -^uG: l"h^ Imo= ::I,:Ze IIC.1iL-II C~t~^^714aG: '. <br />. IIG* ~9<_S:GiC T ..:.^_'(:1:3_:5~._IIORR'{f :~ ~.CLl On <br />SJC~~lO "~.3 O f ! $-;i^, ~SlL aLplica:iC~S aI L2LT:L <br />l:ve~: <br />high 6L'.C00 to 100.GC0 <br />Medium 30,000 ' ~ 60,000 <br />Low 10,000 :.~ 30,OC0 <br />On: ocher assunption inher-_nt in these base thick- <br />ness rccommendctions is that the Cf{ca:~S restliCIIC <br />modulus of the aggregate base ma[e:-ial is :0,000 osi, <br />r:gardless ai the gaaiitt• of Lhe roadbed soil This v;:iue <br />should be used as input to the aomogranh in Figure 3.5 <br />to convca a ponion of the aggrgate base tlticYncss to <br />an equivalent thickness of subbase material with an <br />intermediate modulus value between the base and <br />roadbed soil. <br /> <br />