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• <br />Chapter 4 <br />LOW - VOLUME ROAD DESIGN <br />Pavement structural design for low- volume roads is <br />divided into three categories: <br />(1) flexible pavements, <br />0I ti& pave:nenm and <br />(3) agares su:�.aeed roads. <br />Ths ehapcattxsveis thedesiga of:asvvolumm roads for <br />t#:cse thin surface tVpcs using Proczdat= based an <br />Qe52L�*3 C�c3t'S {2IO�t4�r.C.�.S)9331 �+ - 9.z� C�L2lQ�`S. L�iCS+C <br />tivo 7 =9 1C*%Vrcd is Se =ivns 4.1 and 4.2, <br />r�s i'ti`e.Y. For smfa= U=ttr= or clip s=1 pati�c- <br />rss' strucrum.'thr Qrocedtucs rest fun-bit pavements <br />t -y be usz.4, <br />�� •�� prima. -v asap itx a� ��B' pavemrs;t <br />I= its a-► -ii: Xti' it iS a e"`XS2 in t!il G to <br />Iii: : tC�Tdt ui ,yi�.� r 2::2 S .2ad (_5AL) <br />dc3tW a_noT=Ca for acs+ -yoh r roads. reg- -d ;ess oI <br />how ;*w s ,: traffiw k!4 is-or - has the dit_ brut,,, is <br />bczverst ar..eusc b&:s zn-- trucks. <br />S CC =anycity %me -s and cw =y reads that :ail <br />uxi:!r- %he low- vobun: eztegorymaya :ill Carr) signifi- <br />cant It ­-Is of tr wk azffic, the majdmum number of <br />18 ESA T. apalic shalt consdceed for flexible and <br />rigid pavement design is 700.0w to i million. The <br />pr miuiamM VaRfic irwel that cm be ccm ide,-ed <br />for any 1:=a'blc Or rigid pas =--t during a given <br />p erhm n cc period is about 3o oW 18 -lip ESAL <br />a,-t',pHC240ns. Fortheaegrgaw-surizr.Cd(zravel) roads' <br />used for mauy tauaty an3 fog roads, the maximum <br />U zf =kvclOmnside is : a.(W I8-kip ESAL applica- <br />siens- 's*ile the pr.tttical minimum irt-rl (during a <br />smg3c per otmance, period) is 104000. <br />4.1 IDFsIGNi C L-- RT PROC=LrREs <br />basic step -by -step rreeedures described in Owpter 3_ <br />The primary diffe,renee in the design for low - voiurrre <br />roads is tl:e level of reliability that may be used. <br />Because of their relative !ow usage and the assorted <br />love level of risk, rile IENVI of reliability recommended <br />for law - volume road design is So pement. nje user <br />may, howe-ver, design for higher levels of 64 to go <br />percent, depending on the actual pro;emed level of <br />trafficard the feasibility. of rehabilitation, importance <br />of corridor, etc. <br />If. in estimating an effective msiliert tmodalus of the <br />roadbed material (M or an effective uaoduItts of <br />subg ,-dc reaction (k), i� is not possible •.o determine <br />the lengths of the seasors or even the season-al roadbed <br />soil resilient =oduli, tba roIlowir� st;gsrsvvns should <br />be ac:side--_-0_ <br />ix <br />the estt C"�.s �t�1+»ertch.' <br />... Sets ace. zh�e ;egiti^.r. : :�� �ti�Ta`sie d.I �Ir. <br />z=d to define ah..se soh I gthS . xded. - for <br />dole.—Min the cffeadwroadbe i sail 'R modtstns <br />(Sealers ? 3.1) ;or flexible pxventsnt desip-n or the <br />ef:ecz F a modulus of subgr-&rre rrc-tion (Sc=iioz 3.21) <br />for r.-.-d pavement design. <br />Breconrr lRocdbed�oilResiluntlilodrr& Table 4.2 <br />Provides roadbed soil resilient modulus values that <br />may be used for low - volume road desi _---2 if the user can <br />cl=Lr.v the gene. - al euaiityof the roadbed material as a <br />foundation for the pavement stI ctur e. If the sugges'sgd <br />values in this table are cembiard with the suggested <br />season I.rgths identified in the previous section. <br />effec:ivc roadbed soil resilient modult:s salues (for <br />flexible pavement design only) can be generated for <br />each of the six U.S. climatic regions. These. M values <br />art presented in 'Fable 4.3. <br />4.1.2 Aearee2te- Surfaced Roads <br />i s <br />4.1.1 Fk%'bk and Frigid Pavements <br />n <br />r <br />v!=-r- Is ara gas : :� t• s:►. sir.:_ as <br />P AY' -men eesign. 1 T ::. ! %ol;: :. <br />- ►: ' :�• =- :��'� react on 2 _ sC: of desi-im <br />re -zzi.c mcnis tdcccio: cd in Chap-.:r 2) as weli tits the <br />l t 'A 4f71 'ON <br />Revised March 2010 (PR06) <br />T: c 5ssis for treatag t ^r c :_ss a; scathes! noestu:_ <br />czar. = =._ cr.:aadbe:'. se:. psi: e ^t rr^.c�: l;a. `•;„ is t'- <br />:a 07 1.-, a_• : :Cacev G:SS'A C:J x :: r <br />4_...-�5. �: - _ :'C:..::.... <: =r C ... <br />" :• : tom. r 3.:.'. r oL- r,:QtlireS <br />3 bra ^i : :� : :: s.� :t :tort. It 1i i:,:;`oru :t to ::::r that the <br />'?UT `U0I1213OSSN SIaBJ U1a1S ;AA <br />Attachment 2.05.3(3) -8 -9 <br />IAI}/ i ' I OAA7 A7 •ivui <br />