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CE 563 Airport Design

Reference:  AC  150/5320-­‐6E  

  Pavement  design  life  used    Correct  surface  distress    Correct  surface  condition    Damage  from  overloading    Serve  heavier  aircraft  

  Assess  existing  pavement  condition    Thickness    Condition    Strength    Subgrade  soil  classification    Foundational  strength  

  Subsurface  drainage  condition    Repair  severe  distress  

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  Asphalt  over  existing  flexible  pavement    Concrete  over  existing  flexible  pavement    Asphalt  over  existing  rigid  pavement    Concrete  over  existing  rigid  pavement  

AC 150/5320-6E 9/30/2009!!

"#$$%"&!'"!(#$$)'*&+!,('-(!.-!,)%/&0&1.!-2!%!345!-(!677!-8&()%9:!.;&!-8&()%'+!".(#/.#(&!";-#)+!1-.!$&!/-1"'+&(&+!"%1+<'/;!/-1".(#/.'-1=!!

!FIGURE 4-1. TYPICAL OVERLAY PAVEMENTS

>?!

AC 150/5320-6E 9/30/2009!!

"#$$%"&!'"!(#$$)'*&+!,('-(!.-!,)%/&0&1.!-2!%!345!-(!677!-8&()%9:!.;&!-8&()%'+!".(#/.#(&!";-#)+!1-.!$&!/-1"'+&(&+!"%1+<'/;!/-1".(#/.'-1=!!

!FIGURE 4-1. TYPICAL OVERLAY PAVEMENTS

>?!

AC 150/5320-6E 9/30/2009!!

"#$$%"&!'"!(#$$)'*&+!,('-(!.-!,)%/&0&1.!-2!%!345!-(!677!-8&()%9:!.;&!-8&()%'+!".(#/.#(&!";-#)+!1-.!$&!/-1"'+&(&+!"%1+<'/;!/-1".(#/.'-1=!!

!FIGURE 4-1. TYPICAL OVERLAY PAVEMENTS

>?!

AC 150/5320-6E 9/30/2009!!

"#$$%"&!'"!(#$$)'*&+!,('-(!.-!,)%/&0&1.!-2!%!345!-(!677!-8&()%9:!.;&!-8&()%'+!".(#/.#(&!";-#)+!1-.!$&!/-1"'+&(&+!"%1+<'/;!/-1".(#/.'-1=!!

!FIGURE 4-1. TYPICAL OVERLAY PAVEMENTS

>?!

Base Course HMA

Subgrade

Compression

Tension

  Determine  thickness  and  moduli  of  existing  pavement  layers  

  Aircraft  mixture    Use  FAARFIELD  

  Trial  overlay  thickness    Program  iterates  until  CDF  of  1  is  obtained   Minimum  overlay  of  2  inches  for  asphalt  overlay  of  existing  flexible  pavement  

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  Taxiway    Asphalt  surface,  4  inches    P-­‐209,  10  inches    P-­‐154,  6  inches    Subgrade  CBR  =  10    Negligible  frost  action    Aircraft  mixture  as  shown  

  Find  necessary  asphalt  overlay  thickness  

Aircraft   Gross  Weight,  tons  

Annual  Departures  

DC10-­‐10   458,000   2,263  B747-­‐200B   873,000   832  B777-­‐200  ER   634,500   425  

9/30/2009 AC 150/5320-6E!!!

c. FAARFIELD Overlay Design.!"#$!%&'$($)!$%&*+,-!&.)!+#($$/),0$.*,1.&%!2,.,+$!$%$0$.+!0$+#1)*!&*!,03%$0$.+$)!,.!+#$!45564789:!3(1;(&0!&%%1<!&!),($-+!&33(1&-#!21(!1=$(%&'!)$*,;.>!45564789:!-&%-?%&+$*!+#$!+#,-@.$**!12!1=$(%&'!($A?,($)!+1!3(1=,)$!&!BC/'$&(!%,2$D!<#,-#!*&+,*2,$*!+#$!%&'$($)!$%&*+,-!2&,%?($!-(,+$(,&!21(!%,0,+,.;!*+($**!1(!*+(&,.>!"#$!BC/'$&(!%,2$!+#,-@.$**!,*!)$2,.$)!&*!+#$!)$*,;.!+#,-@.$**>!6$31(+!:E"/455/FG/HIJKLD!:$*,;.!12!E=$(%&'*!21(!6,;,)!5,(31(+!F&=$0$.+*!M*$$!533$.),N!OPD!)$*-(,Q$*!+#$!)$=$%13$)!+#(1?;#!&.!455/2?.)$)!($*$&(-#!$221(+!)$*,;.!0$+#1)!21(!1=$(%&'*!12!(,;,)!3&=$0$.+>!E=$(%&'!3&=$0$.+*!&($!;(1?3$)!,.+1!21?(!),22$($.+!+'3$*!&*!21%%1<*R!

(1) S1+!G,N!5*3#&%+!E=$(%&'!12!8N,*+,.;!4%$N,Q%$!F&=$0$.+!(2) T1.-($+$!E=$(%&'!12!8N,*+,.;!4%$N,Q%$!F&=$0$.+!!(3) S1+!G,N!5*3#&%+!E=$(%&'!12!8N,*+,.;!6,;,)!F&=$0$.+!!(4) T1.-($+$!E=$(%&'!12!8N,*+,.;!6,;,)!F&=$0$.+!

404. OVERLAYS OF EXISTING FLEXIBLE PAVEMENTS>!"#$!)$*,;.!12!&.!1=$(%&'!21(!&.!$N,*+,.;!2%$N,Q%$!3&=$0$.+!,*!$**$.+,&%%'!+#$!*&0$!&*!)$*,;.,.;!&!.$<!3&=$0$.+>!"#$!$N,*+,.;!2%$N,Q%$!3&=$0$.+!,*!-#&(&-+$(,U$)!Q'!&**,;.,.;!+#$!&33(13(,&+$!+#,-@.$**$*!&.)!01)?%,!12!+#$!$N,*+,.;!%&'$(*>!5!A?&%,2,$)!$.;,.$$(!*#1?%)!Q$!-1.*?%+$)!+1!-#&(&-+$(,U$!+#$!$N,*+,.;!3&=$0$.+!%&'$(*>!

a. Hot Mix Overlay of an Existing Flexible Pavement.!5!+(,&%!+#,-@.$**!12!1=$(%&'!,*!*$%$-+$)!&.)!+#$!3(1;(&0!,+$(&+$*!?.+,%!&!T:4!12!K>C!,*!($&-#$)>!"#$!1=$(%&'!+#,-@.$**!($A?,($)!+1!&-#,$=$!&!T:4!12!K>C!,*!+#$!)$*,;.!+#,-@.$**>!!S1<$=$(D!+#$!0,.,0?0!#1+!0,N!1=$(%&'!12!&.!$N,*+,.;!2%$N,Q%$!3&=$0$.+!,*!B!,.-#$*!MVC!00P>!

!FIGURE 4-2. DESIGN EXAMPLE OF FLEXIBLE OVERLAY ON EXISTING FLEXIBLE PAVEMENT

(1) Example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

VL!

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  Taxiway    Asphalt  surface,  4  inches    P-­‐209,  12  inches    Subgrade  CBR  =  10  (k  =  141  pci)    Negligible  frost  action    Aircraft  mixture  as  shown  

  Find  necessary  PCC  overlay  thickness  

9/30/2009 AC 150/5320-6E!!!

!FIGURE 4-3. DESIGN EXAMPLE OF RIGID OVERLAY ON EXISTING FLEXIBLE PAVEMENT

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

a. Structural Condition Index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

TABLE 4-1. RIGID PAVEMENT DISTRESS TYPES USED TO CALCULATE THE STRUCTURAL CONDITION INDEX, SCI

='&2-$&&! A$,$-'20!Q$,$.!B*-)$-!W-$/X!! Q*8?!H$%'74?!Y'(#!Q*)('27%')/.K"-/)&,$-&$K='/(*)/.!B-/5X')(! Q*8?!H$%'74?!Y'(#!A#/22$-$%!A./6! Q*8?!H$%'74?!Y'(#!A#-')X/($!B-/5X&!;5-/5X')(!3/-2'/.!8'%2#!*+!&./6>/! Q*8!A3/..')(Z[*')2! Q*8?!H$%'74?!Y'(#!A3/..')(ZB*-)$-! Q*8?!H$%'74?!Y'(#!

!/!\&$%!*).0!2*!%$&5-'6$!/!.*/%:')%75$%!5-/5X!2#/2!$12$)%&!*).0!3/-2!*+!2#$!8/0!/5-*&&!/!&./69!!"#$!ABC!%*$&!)*2!')5.7%$!5*),$)2'*)/.!&#-')X/($!5-/5X&!%7$!2*!57-')(!*-!*2#$-!)*)!.*/%:-$./2$%!3-*6.$4&9!

F)!ABC!*+!IS!'&!2#$!EFF!%$+')'2'*)!*+!&2-7527-/.!+/'.7-$!*+!/!-'('%!3/,$4$)2?!/)%!'&!5*)&'&2$)2!8'2#!TS!3$-5$)2!*+!&./6&!')!2#$!2-/++'5!/-$/!$1#'6'2')(!/!&2-7527-/.!5-/5X9!"#$!ABC!/..*8&!/!4*-$!3-$5'&$!/)%!-$3-*%75'6.$!-/2')(!*+!/!3/,$4$)2R&!5*)%'2'*)!2#/)!2#$!3-$,'*7&!EFF!5*)%'2'*)!+/52*-!-/2')(&?!Cb!/)%!Cr9!

]L!

  Determine  condition  of  existing  rigid  pavement    Structural  condition  index  (SCI)    Cumulative  damage  factor  used  (CDFU)  

  Determine  thickness  and  moduli  of  existing  pavement  layers  

  Aircraft  mixture    Use  FAARFIELD  

  Trial  overlay  thickness  

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  Derived  from  pavement  condition  index  (PCI)    Uses  only  the  structural  components  of  PCI    PCI  has  15  different  distress  types    SCI  uses  6  of  the  15  

  FAA  defines  rigid  structural  failure  at  SCI  =  80    50  percent  of  slabs  exhibit  structural  crack  

Distress   Severity  Level  

Corner  break   Low,  Medium,  High  Longitudinal/transverse/diagonal  cracking  

Low,  Medium,  High  

Shattered  slab   Low,  Medium,  High  Shrinkage  cracks   Low  Spalling-­‐joint   Low,  Medium,  High  Spalling-­‐corner   Low,  Medium,  High  

!"#=!""!$" % #&'$!

($)

'(%

(=!

*(

#'=!

+,

#

  a  =  adjustment  factor    ms  =  total  number  of  distress  types  related  to  

pavement  structural  failure    nj  =  total  number  of  severity  levels  for  the  ith  

distress    f(Ti,  Sj,  Dij)  =  deduct  value  for  distress  type  Ti,  at  the  

severity  level  Sj,  existing  at  density  Dij  

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  When  SCI  =  100,  no  visible  distresses  contributing  to  reduction  in  SCI  

  Use  the  CDFU    Defines  existing  pavement  life  that  has  been  used  up  to  the  time  of  overlay  

  CDFU  =  100,  existing  pavement  life  has  been  used  

  LU  =  number  of  years  of  operation  of  the  existing  pavement  until  overlay  

  LD  =  design  life  of  the  existing  pavement  in  years  

!"#$%&$

'()*&"

++,-./+&$0'()*&

"

!"#$%1+++++++++++++++,-./+&$2'()*&

"

  FAARFIELD  will  calculate  CDFU    Enter  the  structure  based  on  original  design  assumptions  

  Enter  estimated  traffic  applied  to  the  pavement    Set  design  life  to  number  of  years  existing  pavement  has  been  in  operation  

  Run  life    CDFU  is  displayed  

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  Taxiway    PCC,  15.3  inches    P-­‐306  Econocrete,  6  inches    P-­‐209,  6  inches    Subgrade  CBR  =  10  (k  =  141  pci)    Negligible  frost  action    Aircraft  mixture  as  shown,  12  year  in-­‐service  life  

  Find  CDFU  

Aircraft   Gross  Weight,  tons  

Annual  Departures  

DC10-­‐10   458,000   1,200  B747-­‐200B   873,000   300  B777-­‐200  ER   634,500   200  

9/30/2009 AC 150/5320-6E!!

!

"#$!%&''(!&)*#)+,+!-#)-$,.,!#/,$'0(1!.2,!3#+&'&4!#%!.2,!*04,!50/,3,).!/0$6,4!04!0!%&)-.6#)!#%!.2,!789!#%!.2,!*04,!

50/,3,).!:2,)!.2,!789!64!',44!.20)!;<<=!>264!-#35&.0.6#)!64!+#),!0&.#30.6-0''(!:6.26)!"??@"9ABC=!>2,!,D&0.6#)4!

%#$!.2,!3#+&'&4!$,+&-.6#)!04!0!%&)-.6#)!#%!.2,!789!0$,!E6/,)!6)!@,5#$.!F#=!CG>H"??HIJHKLM;N=!

Example=!>2,!%#''#:6)E!4.,54!6''&4.$0.,!.2,!5$#-,+&$,!%#$!-0'-&'0.6)E!8C"OP!

!

FIGURE 4-4. CDFU COMPUTATION USING FAARFIELD

(1) 7,.!&5!.2,!4.$&-.&$,!*04,+!#)!.2,!#$6E6)0'!+,46E)!044&35.6#)4=!?44&3,!0)!,Q64.6)E!.0Q6:0(!

50/,3,).!-#35#4,+!#%P!;R=S!6)-2!TSKK!33U!.26-V!I88!4&$%0-,!-#&$4,W!X!6)-2!T;RY!33U!.26-V!4.0*6'6Z,+!*04,!-#&$4,1!

9.,3!IHS<X!A-#)#-$,.,W!X!6)-2!T;RY!33U!.26-V!4&**04,!-#&$4,1!9.,3!IHY<N!8$&42,+!?EE$,E0.,=!>2,!4&*E$0+,!VH/0'&,!64!

;[;!5-6!TSK=[!JFM3SU1!,D&6/0',).!.#!0)!EH3#+&'&4!#%!;R1<<<!546!T;<S=[!JI0U=!>2,!,Q64.6)E!50/,3,).!:04!+,46E),+!.#!0--#33#+0.,!.2,!%#''#:6)E!06$5'0),!36QP!YYXS!0))&0'!+,50$.&$,4!#%!.2,!C8;<H;<!TE$#44!.0Q6!:,6E2.![RK1<<<!'*4!TY<L!

L<<!VEUU1!KSY!0))&0'!+,50$.&$,4!#%!.2,!\L[LHY<<\!8#3*6!J6Q,+!TE$#44!.0Q6!:,6E2.!KSS1<<<!'*4!TSLL!K<<!VEUU1!0)+![YR!

0))&0'!+,50$.&$,4!#%!.2,!\LLLHY<<!A@!TE$#44!.0Q6!:,6E2.!XS[1R<<!'*4!TYKL!K<<!VEUU=!>2,!+,46E)!'6%,!:04!Y<!(,0$4=!

(2) A4.630.,!.2,!.$0%%6-!055'6,+!.#!.2,!50/,3,).!0)+!,).,$!6.!6).#!.2,!06$5'0),!+,46E)!'64.=!?44&3,!

.20.!.2,!0))&0'!.$0%%6-!',/,'4!0-.&0''(!055'6,+!.#!.2,!50/,3,).!:,$,P!;Y<<!0))&0'!+,50$.&$,4!#%!.2,!C8;<H;<1!S<<!0))&0'!

+,50$.&$,4!#%!.2,!\L[L1!0)+!Y<<!0))&0'!+,50$.&$,4!#%!.2,!\LLL=!

(3) 7,.!]C,46E)!B6%,^!.#!.2,!)&3*,$!#%!(,0$4!.2,!50/,3,).!:6''!20/,!*,,)!6)!#5,$0.6#)!&5!.#!.2,!

.63,!#%!.2,!#/,$'0(=!?44&3,!.20.!0.!.2,!.63,!#%!.2,!#/,$'0(!.2,!.0Q6:0(!:6''!20/,!*,,)!6)!#5,$0.6#)!%#$!;Y!(,0$4=!9)!.2,!

]7.$&-.&$,^!:6)+#:1!-'6-V!#)!]C,46E)!B6%,^!0)+!-20)E,!.#!;Y!(,0$4=!"6E&$,![H[!42#:4!.20.!.2,!+,46E)!'6%,!204!*,,)!

0+_&4.,+!.#!;Y!(,0$4=!

(4) @&)!B6%,=!>2,!-0'-&'0.,+!5,$-,).!8C"O!:6''!055,0$!#)!.2,!7.$&-.&$,!4-$,,)1!0.!.2,!'#:,$!',%.!

#%!.2,!50/,3,).!4,-.6#)=!T7,,!%6E&$,![H[U=!

"#$!.2,!0*#/,!-04,1!"??@"9ABC!-0'-&'0.,4!5,$-,).!8C"O!,D&0'!.#![<=<K=!"#$!#/,$'0(!+,46E)1!.2,!/0'&,!8C"O!`![<!

5,$-,).!:#&'+!*,!&4,+=!

XS!

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  SCI  less  than  100    Existing  pavement  has  structural  distress    FAARFIELD  assumes  initial  overlay  thickness  and  iterates  until  reaching  20-­‐year  design  life  

  SCI  equals  100    No  structural  distress    CDFU  is  needed    FAARFIELD  assumes  initial  overlay  thickness  and  iterates  until  reaching  20-­‐year  design  life  

  Taxiway    PCC,  14  inches    P-­‐304  CTB,  6  inches    P-­‐209,  6  inches    Subgrade  CBR  =  10  (k  =  141  pci)    Negligible  frost  action    Aircraft  mixture  as  shown  

  Find  required  asphalt  thickness  

Aircraft   Gross  Weight,  tons  

Annual  Departures  

DC10-­‐10   458,000   2,263  B747-­‐200B   873,000   832  B777-­‐200  ER   634,500   425  

4/14/14

9

AC 150/5320-6E 9/30/2009!!

"#$%&'!(')**#+!,&-&,./!%&)-#&'!)#'0,)1&./!2'!)!,21$&'!34&.#$1!,#*&5!6#,,!'&.7,(!#1!)!%#$%&'!+),+7,)(&4!-),7&!2*!89:;<=!>1!(%#.!&?)@0,&/!#*!(%&!%#$%&'!(')**#+!,&-&,.!7.&4!#1!(%&!2'#$#1),!4&.#$1!%)4!)+(7),,A!B&&1!)00,#&4!(2!(%&!0)-&@&1(/!(%&!0&'+&1(!9:;<!+2@07(&4!BA!;CCD;>EF:!627,4!#1+'&).&!(2!GH=IJ=!!

c. Hot Mix Asphalt Overlays of Existing Rigid Pavements.!K%&!4&.#$1!0'2+&..!*2'!%2(!@#?!2-&',)A.!2*!'#$#4!0)-&@&1(.!+21.#4&'.!(62!+214#(#21.!*2'!(%&!&?#.(#1$!'#$#4!0)-&@&1(!(2!B&!2-&',)#4L!MJN!O9>!2*!(%&!&?#.(#1$!0)-&@&1(!,&..!(%)1!JPPQ!MIN!O9>!&R7),!(2!JPP=!!

(1) Structural Condition Index Less Than 100. K%&!@2.(!,#S&,A!.#(7)(#21!#.!21&!#1!6%#+%!(%&!&?#.(#1$!0)-&@&1(!#.!&?%#B#(#1$!.2@&!.('7+(7'),!4#.('&../!#=&=/!(%&!O9>!#.!,&..!(%)1!JPP=!>*!(%&!O9>!#.!,&..!(%)1!JPP/!(%&!2-&',)A!)14!B).&!0)-&@&1(!4&(&'#2')(&!)(!)!$#-&1!')(&!71(#,!*)#,7'&!#.!'&)+%&4=!;CCD;>EF:!)..7@&.!)1!#1#(#),!2-&',)A!(%#+S1&..!)14!#(&')(&.!21!(%&!2-&',)A!(%#+S1&..!71(#,!)!IPTA&)'!,#*&!#.!0'&4#+(&4=!C!IPTA&)'!0'&4#+(&4!,#*&!.)(#.*#&.!(%&!4&.#$1!'&R7#'&@&1(.=!

(i) Example. K2!#,,7.(')(&!(%&!0'2+&47'&!2*!4&.#$1#1$!)!"UC!2-&',)A/!)..7@&!)1!&?#.(#1$!()?#6)A!0)-&@&1(!+2@02.&4!2*!(%&!*2,,26#1$!.&+(#21L!(%&!.7B$')4&!k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

[TVPJ!C9!2-&',)A!! ! V=I_!#1+%&.!MJP_!@@N![99!O7'*)+&! ! ! JV!#1+%&.!MWZ\!@@N![TWPV!O()B#,#]&4!B).&! ! !!!\!#1+%&.!MJZI!@@N![TIP_!O7BB).&!! ! !!!\!#1+%&.!MJZI!@@N!

K2(),!0)-&@&1(!(%#+S1&..! WP=I_!#1+%&.!MHHP!@@N!

K%&!'&R7#'&4!2-&',)A!(%#+S1&..!#.!V=I_!#1+%&.!MJP_!@@N!)14!6#,,!B&!'2714&4!70!(2!V=Z!#1+%&.!MJJV!@@N!MO&&!*#$7'&!VTZN=!K%&!(%#+S1&..!$&1&')(&4!BA!;CCD;>EF:!42&.!12(!)44'&..!'&*,&+(#21!+')+S#1$=!C44#(#21),!$7#4)1+&!21!'&*,&+(#21!+')+S#1$!#.!0'2-#4&4!#1!0)')$')0%!VPZ+MZN=!

!FIGURE 4-5. DESIGN EXAMPLE OF FLEXIBLE OVERLAY ON EXISTING RIGID PAVEMENT WITH

SCI 70

\V!

  Taxiway    PCC,  14  inches    P-­‐304  CTB,  6  inches    P-­‐209,  6  inches    Subgrade  CBR  =  10  (k  =  141  pci)    Negligible  frost  action    Aircraft  mixture  as  shown    CDFU  =  50  percent  

  Find  required  asphalt  thickness  

9/30/2009 AC 150/5320-6E!!!

(2) Structural Condition Index Equal to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

(i) Example.!L3!&::9'(7+($!(/$!*73=$<97$!34!<$'&)#&#)!+#!MN"!3,$7:+;@!+''9-$!+#!$%&'(&#)!7&)&<!(+%&.+;!*+,$-$#(>!L/$!$%&'(&#)!*+,$-$#(!'$=(&3#!+#<!+&7*:+#$!-&%!&'!(/$!'+-$!+'!(/$!$%+-*:$!&#!G5H!+?3,$>!B73'(!+=(&3#!&'!#$):&)&?:$>!L/$!012!&'!566!G(/$7$!+7$!#3!,&'&?:$!'(79=(97+:!<&'(7$''$'H@!?9(!?+'$<!3#!+#!+#+:;'&'!34!(/$!(7+44&=!(/+(!/+'!?$$#!+**:&$<!?;!(/$!*+,$-$#(!(3!<+($@!(/$!O!1ABC!&'!$'(&-+($<!(3!?$!P6!*$7=$#(>!L/$!4:$%&?:$!*+,$-$#(!3,$7:+;!7$89&7$<!?+'$<!3#!B""DB2EFA!437!(/$'$!=3#<&(&3#'!&'Q!

RKS65!"1!3,$7:+;!! ! !!!!T>JP!&#=/$'!GUT!--H!R11!0974+=$! ! ! !!5S>66!&#=/$'!GTPV!--H!RKT6S!0(+?&:&W$<!?+'$! ! !!!!V>66!&#=/$'!G5PJ!--H!RKJ6X!09??+'$!! ! !!!!V>66!&#=/$'!G5PJ!--H!

L3(+:!*+,$-$#(!(/&=I#$''! !!JX>JP!&#=/$'!GYST!--H!

L/$!7$89&7$<!3,$7:+;!(/&=I#$''!G+'!'/3.#!&#!4&)97$!SKVH!&'!T>JP!&#=/$'!GUT!--H@!./&=/!.&::!?$!739#<$<!9*!(3!T>P!&#=/$'!GUX!--H>!L/$!7$89&7$<!3,$7:+;!(/&=I#$''!&'!5!&#=/!GJP>S!--H!:$''!(/+#!(/$!$%+-*:$!&#!G5H@!7$4:$=(&#)!(/$!4+=(!(/+(!(/$!R11!&'!&#!?$(($7!=3#<&(&3#>!

!FIGURE 4-6. DESIGN EXAMPLE OF FLEXIBLE OVERLAY ON EXISTING RIGID PAVEMENT WITH

SCI 100

(3) Previously Overlaid Rigid Pavement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

(4) Limitations.!B37!/3(!-&%!+'*/+:(!3,$7:+;!(/&=I#$''@!(/$!B""DB2EFA!*73)7+-!+''9-$'!(/$!$%&'(&#)!7&)&<!*+,$-$#(!.&::!'9**37(!:3+<!(/739)/!4:$%97+:!+=(&3#>!"'!(/$!3,$7:+;!(/&=I#$''!?$=3-$'!)7$+($7@!+(!'3-$!*3&#(!(/$!$%&'(&#)!7&)&<!*+,$-$#(!.&::!($#<!(3!+=(!-37$!:&I$!+!/&)/!89+:&(;!?+'$!-+($7&+:>!"'!(/$!3,$7:+;!(/&=I#$''!+**73+=/$'!(/$!(/&=I#$''!34!(/$!7&)&<!*+,$-$#(@!&(!-+;!?$!-37$!$=3#3-&=+:!(3!(7$+(!(/$!<$'&)#!+'!+!#$.!4:$%&?:$!

VP!

4/14/14

10

PCC  

Load-­‐induced  movement  

HMA  

Reflection  crack  

Climate-­‐induced  movement  

  PCC  overlay  is  intentionally  not  bonded  to  existing  PCC  surface  

  Typical  for  badly  cracked  pavements    Thin  layer  of  asphalt  mixture  used  as  bond  breaker    Determine  SCI  of  existing  pavement    Determine  thickness  and  moduli  of  existing  pavement  layers  

  Aircraft  mix    Use  FAARFIELD  

  Trial  overlay  thickness  

  Taxiway    Debonding  layer,  1  inch    PCC,  14  inches    P-­‐304  CTB,  6  inches    P-­‐209,  6  inches    Subgrade  CBR  =  10  (k  =  141  pci)    Negligible  frost  action    Aircraft  mixture  as  shown    SCI  =  40  percent  

4/14/14

11

9/30/2009 AC 150/5320-6E!!

!

(1) Fully Unbonded Concrete Overlay.!"#!$#%&#'('!)&#)*(+(!&,(*-./!&0!.#!(123+2#4!*242'!5.,(6(#+!23!&#(!2#!782)8!3+(53!.*(!+.9(#!+&!2#+(#+2&#.--/!(-262#.+(!%&#'2#4!%(+7((#!+8(!&,(*-./!.#'!(123+2#4!5.,(6(#+:!

;&66&#-/<!+8(!%&#'!23!%*&9(#!%/!.55-/2#4!.!+82#!8&+!621!-./(*!+&!+8(!(123+2#4!*242'!5.,(6(#+:!=8(!2#+(*0.)(!0*2)+2&#!

)&(002)2(#+!%(+7((#!+8(!&,(*-./!.#'!(123+2#4!5.,(6(#+!23!3(+!+&!*(0-()+!.#!$#%&#'('!)&#'2+2&#:!=8(!2#+(*0.)(!)&(002)2(#+!

23!021('!.#'!).##&+!%(!)8.#4('!%/!+8(!$3(*:!"3!72+8!8&+!621!.358.-+!&,(*-./3<!.#!>;?!23!*(@$2*('!+&!'(3)*2%(!+8(!

)&#'2+2&#!&0!+8(!(123+2#4!5.,(6(#+:!"!+*2.-!&,(*-./!+82)9#(33!23!2#5$+!.#'!A""BA?CDE!2+(*.+(3!$#+2-!.!FGH/(.*!3(*,2)(!

-20(!23!5*('2)+(':!=8(!+82)9#(33!+8.+!/2(-'3!.!FGH/(.*!3(*,2)(!-20(!23!+8(!'(324#!+82)9#(33:!I&7(,(*<!+8(!62#26$6!

+82)9#(33!0&*!.!0$--/!$#%&#'('!)&#)*(+(!&,(*-./!23!J!2#)8(3!KLMG!66N:!!

(i) Example:!=&!2--$3+*.+(!+8(!5*&)('$*(!&0!'(324#2#4!.#!$#%&#'('!)&#)*(+(!&,(*-./<!.33$6(!.#!(123+2#4!+.127./!5.,(6(#+!)&65&3('!&0!+8(!0&--&72#4!3()+2&#O!>;?!23!PG!0&*!+8(!(123+2#4!Q;;!3$*0.)(<!+8(!

3$%4*.'(!9H,.-$(!23!LPL!5)2!KMR:P!STU6MN<!)&**(35&#'2#4!+&!.#!EH6&'$-$3!&0!LJ<GGG!532!KLGM:PF!SQ.N<!+8(!(123+2#4!Q;;!3$*0.)(!)&$*3(!23!LP!2#)8(3!KLGF!66N!+82)9<!+8(!%.3(!)&$*3(!23!V!2#)8(3!KMGJ!66N!+82)9<!.#'!+8(!3$%%.3(!)&$*3(!23!V!

2#)8(3!KLJF!66N:!A*&3+!.)+2&#!23!#(4-242%-(:!"33$6(!+8(!(123+2#4!5.,(6(#+!23!+&!%(!3+*(#4+8(#('!+&!.))&66&'.+(!+8(!

0&--&72#4!.2*5-.#(!621O!E;LGHLG!7(2482#4!PJR<GGG!5&$#'3!KFGW!WPJ!94N!.+!.#!.##$.-!'(5.*+$*(!-(,(-!&0!F<FVM<!XWPWH

FGGX!;&6%2!S21('!7(2482#4!RWM<GGG!5&$#'3!KMYJ!YRV!94N!.+!.#!.##$.-!'(5.*+$*(!-(,(-!&0!RMF<!.#'!XWWWHFGG!CB!

7(2482#4!VMP<JGG!5&$#'3!KFGW!RGP!94N!.+!.#!.##$.-!'(5.*+$*(!-(,(-!&0!PFJ:!"33$6(!+8.+!+8(!Q;;!3+*(#4+8!23!WGG!532!0&*!

%&+8!+8(!&,(*-./!.#'!+8(!(123+2#4!)&#)*(+(:!=8(!&,(*-./!3+*$)+$*(!)&65$+('!%/!A""BA?CDE!0&*!+8(3(!)&#'2+2&#3!23Z!

Q;;!$#%&#'('!&,(*-./! ! LM:JF!2#)8(3!KMPM!66N!

E(%&#'2#4!-./(*! ! L:GG!2#)8(3!KFJ!66N[!

Q;;!>$*0.)(! ! ! LP!2#)8(3!KMJV!66N!

QHMGP!>+.%2-2\('!%.3(! ! !!V!2#)8(3!KLJF!66N!

QHFGY!>$%%.3(!! ! !!V!2#)8(3!KLJF!66N!

=&+.-!5.,(6(#+!+82)9#(33! MY:JF!2#)8(3!KL!GGP!66N!

[T&+(O!A""BA?CDE!'&(3!#&+!2#)-$'(!+8(!'(%&#'2#4!-./(*!2#!+82)9#(33!).-)$-.+2&#3:!

!

FIGURE 4-7. DESIGN EXAMPLE OF RIGID OVERLAY ON EXISTING FULLY UNBONDED RIGID PAVEMENT

A24$*(!PHW!38&73!+8(!*(@$2*('!&,(*-./!+82)9#(33!23!LM:JF!2#)8(3!KMPM!66N<!782)8!72--!%(!*&$#'('!+&!+8(!#(.*(3+!G:J!

2#)8(3<!&*!LM:J!2#)8(3!KMPM!66N:!

(2) Bonded Concrete Overlays. ;&#)*(+(!&,(*-./3!%&#'('!+&!(123+2#4!*242'!5.,(6(#+3!.*(!3&6(+26(3!$3('!$#'(*!)(*+.2#!)&#'2+2&#3:!X/!%&#'2#4!+8(!)&#)*(+(!&,(*-./!+&!+8(!(123+2#4!*242'!5.,(6(#+!+8(!#(7!

VW!

  PCC  overlay  is  bonded  to  existing  PCC  surface    Typical  for  pavements  in  good  to  excellent  condition    Grout  used  to  bond  pavements    Bonded  pavement  act  as  monolithic  slab    Determine  thickness  and  moduli  of  existing  pavement  layers  

  Aircraft  mix    Use  FAARFIELD  

  Design  as  new  rigid  pavement    Existing  PCC  flexural  strength  

!"#!$!

%

  hc  =  PCC  overlay  thickness    h  =  Required  slab  thickness    he  =  Existing  pavement  thickness  

4/14/14

12

  Asphalt  over  rubblized  PCC    Similar  to  an  asphalt  over  flexible  pavement  overlay  design  

  Concrete  over  rubblized  PCC    Similar  to  design  of  a  new  PCC  pavement  

  FAARFIELD  can  accept  a  rubblized  PCC  layer    It  becomes  very  important  to  determine  the  correct  modulus  value  for  the  rubblized  PCC  

Slab  thickness,  inches   Modulus,  ksi  6-­‐8   100-­‐135  8-­‐14   135-­‐235  >14   235-­‐400