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March 30,2009 <br /> HWA Yroject No.2009-030-21 <br /> 3.4.3 Portland Cement Concrctr(1'CC)Pavement Design <br /> New full-depth PCC pavcment will bc rcquired within the bus terminnl to accommodate <br /> the projcctcd traffc loads discussed above. Table 1 provides our recommcndations for <br /> PCC pavemcnt structural layer requircmcnts buscd on thc design method given in the <br /> 1993 AASI I"CO Ucsign Guidc(AASHTO, 1993)and using the following para�neters: <br /> • Rcliabiliry=90% <br /> � • Dcsign Lifc=40 Yeurs ' <br /> • • initial5erviceability=4.5 <br /> • 'I'crminal Scrvicc�biliry=2.5 <br /> • Ovcrall Slandard Deviatioii=0.35 <br /> Tabicl.�;• ' <br /> Structurc Rc uirements for New PCG,Pavcmcnt <br /> Matcrial Dcscription Mfnimum Layer Thickness WSDOT Slandard <br /> (inchcs) Specillcatlon <br /> rcc t i s-os <br /> CSBC 8 9-03.9(3 <br /> StructurnlFilUPrepnredSuUgrnde Prooi-roll 9•03.14(i) <br /> PCC: Ponland Ccmcnt Concre�c � <br /> CSI3C: Crushed Surfaaing IIacc Coursc campactcd ns spcciticd. <br /> Thc following sl�ould Uc iioted: '� <br /> • 7'he pavcmcnt Inycr thicknesses given in'1'nblc 1 do not account for helvy <br /> construction traffic. If�signiiicunt volumc of conslruction trnffic(mainly <br /> fully-londcd trucks)wi4 operale over the completed basc bcforc placement of <br /> the surfacing,or if tlie nioisturc content of tlic subgrade is elevated as residt of <br /> t.�infall,thcn hcnving and tulting could occur, in such cascs,thc thickncss of <br /> basc,or stnictural fiil,should bc incrcused. One to two fcet of structurnl fill <br /> may be required bclow ihc CSBC in ordcr to provide a blse 1'or thc compactcd <br /> mntc '�Is ubovc. <br /> • Puvcmcnt design using a reliability level of 90%cw�bc inler�xeted as meaning <br /> that prior to lhe end of the dcsign period,about 10%of the pavemen;will <br /> requirc reconsul�ction because of slructural fuilure. Thercforo,�s the design <br /> lifc is npproached,the serviceability of dic pavement should be critically <br /> vic�ved to detem�inc thc nccd for a�id e�lent of the overlay application that <br /> may bc rcquircd. <br /> 2009•O70d I Ornll raa � HWA GeoSCIENCC511�C <br /> ( / <br />