CHAPTER 16 HIGHWAY AND AIRPORT PAVEMENTS GENERAL Differences in design or concmc pavements among the transportation age cies of the Stntes:, Counties and Municir,ali1'i~ involve thickness; joint types and spacing; and the amount of reinforcing steel and its 1111Dg Cmc nt in the pavement. The thickness of a highway or airport pavement clcp<.,1ds on the sub~ support, strength of the COl1CICt C, the frequency and weight of wheel loads for the design life ofdle pavement, and type ofsubbasc. Thie~ for m<><kr: le; \'OJumo concrete street~ u..~ '. lr)' om 7 10 1 O inch~, whale, hi 1 v,4 P-Avemcnb rnngwom 8 to 15 mchcs. I-or airport pavemen ts,, lhiclrne~~se. ~.. ar from 1:fiiiches for lightairplall(:-; to over?:4 inches 'orhca,.,y-<rtltyw idc4>ody tii l~c Concrete hig_hw. :i. ys are ui;ually comaructcd in rnu11iplc lanes of 12 feet; with 24 feet being a smndard paving width for tntersta,e highways. Air ports are paved in multiples of 12. 5 to 25 feet. 11,e width of paveme,!!S..!l)r airports is usoa[Jy J50 f<,-cl..(or nmways and /'J feet for taxiway5 ~ncret vcmcnc:s: may be d1v1ded into t1. fcc ~ pc:,. : J. Coutinuousl)' reinforced concrete pavement {CRCP) 2, ~led rci?iforc:cd concrete pnvemcnl (JRC:P) . Plain <. :Om:rctc ~emcru (I;CP) wlth weake~mill Je or saw OO trdn:>­ verse JOinls., CONTINUOUSLY REINFORCED CONCRETE PAVEMENT In continuously reinforced concrete pavement (CRCP), longitudinal rcin Jon: iog ba B in the range of 0. SS to 0. 90% of die pavement's cross-sectional area, are used continuously to hold tight random transve,se cracks that form due to concrete shrinkage ond environmental fiic1or.. Usually #S to /fl bars are placed on tr\\nsverse 114 bars supported by chairs, unless tube feeding is used, and no chaiis are required. Each loogitudinal reinforcing !>. Ir must be able to develop its full yield strength load from end to end of the pavement with full strength at each line Plac:.,g Reo>tordng Bara-1 0th Edition 1 6--1 Section 609 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 6-9