Park West CC(15.1)-CS 941118--NOU-18-'g4 FRI 15:59 ID:REED ENG. GROUP tEL N0:214 350-001g ~80g P02
lto~r lit 1994
H~O~ee~.. No, 1920
pro~e deltgn group, ln~.
2607 #elnut Hill lane, 8uite 100
Dallaeo Texas 75229
Lone Star Plywood
Airlinm Drive
COPl~ll, Texas
D~ar Nar~=
Submitted here ars recomuondations regarding equivalent pavement
· eotion$ for the refereneed project. The standard pavement was
oonsldered to consist off 6-inuh thiok, 3,000 pounde per nqunre inoh
(poi) oompressive strong.~h senators over 6 inohea of lime-
stabilized gubgrade. Tho M%nlysls hue oonetgted of determining the
daily repetitions off an equivalent la-kip axle load and a 20-year
design Xife. TAe analysis golXowe~ procedures Zrom the American
Association of State HI~A~y 0gf£cia~a (AASHO) Xnterlm Guide, A
copy of the AASHO design nouograph is attached es Plate 1.
Three pavoaent sections have been analyzed; the referenced
wotandlrd# pavement, $ i~ohe$ of 4,000-psi concrete, and ? inches
of 3,000-poi concrete. T~t latter two ~ectiona ware analyzed
considerfng natural or u~abiliz~
The first factor to be derived consists of the modulus o£ subgrade
reaction, k, for bo~h the natural subgrade and on top o£ a six-inch
layer of l~me stabilized. A value of 100 pounds per cubic ~nch
(poi) is recommended for the natural aubgrade, corrola~ions
developed by the Federal Aviation AdBinimtra=ion (FAA) £Or oemen~-
m~ubtltled aubqrade provid~ an e£fect~vs k value, considering a 6-
lnoh stabilized subgrade o£ 210 pci. Two hundred pcl was used for
tho analysis. A copy o£ the FAA correlation is attached as Pla~e
2.
2&24S'I'U'rZ DRIVE · SUITE 400 · ~ TEXAS 75236 · 214/360.5800 · (FAX) 214/35043019
NOU-18-'94 FRI 15:57 ID:REED ENG. ~ROUP TEL N0:214 350-0019 ~809 P03
migl~ grou~, inc.
No. ~920
Novmr 18, 1994
~ seoond rioter required to evaluate the #ctione consists of the
vorkiH Itrell of the ¢onorete. T~il value ie e~uml to 0.75
p~roent of ~he modulus of r~ure (~). Correlat~ ~w~n the
c~ress~ve s~reng=h and ~ indicate that the~ can ~
· ~r~. This analysis results in a worki~ ~trell of ~70 and 425
~i Eot ~e 3,000- a~d 4,00O-psi concrete, reactively.
Al~lio~tion of the AABNO homograph results in the derived
~iuiv&lent 18-kip axle loa4~ show~ ~1~.
6-1n~i~, 3,000 ps/ concrete
over 6" lime
40
aN, 4,000 pli conore ~e
over natural subgr&~e
40
7", 3,000 psi concrete
over natural subgr~e
7O
B dllaUlled above and as ~kown on Plata 1, the allowable daily
tr&££i¢ Il based on a 20-year design life.
~en~d on thie analysis, G inches of 4,000-pmi ooncrete over a non-
ll~-~tabilized subgrade i~ the equivalen~ off 6 ~no~es 0£ 3,000-psi
oonorete over 6 inches of l[me-etabilised sukgr&de.
arise, do not hesitate to call.
If any
REED
Id F. Reed, P.E.
oopies submitted: (~)
NOU-iS-'94 FRI 15:58 ID:REED ENG. BROUP TEL N0:214 350-0019 ~809 P04
I
~ OF RIG, lO Ht01-1WA¥ PAVI~$
;:'
;: !:..'
strate the ~ensitivity of the factors. It can be seen that the method is sensitive to
tra~c and quite sensitive to the stren~[th of the concrete itself. The modulus 6{ 'j'
sub,fade reaction has a relatively minor effect. These data are £or ~parnttive
purposes ami must be viewed with some caution, since experience has showll . '..
that the unktaown= o! variability (Ghapter !,~), .'md the tenuoui metluads o[ esti-
mating trll~ (Ohapter 4) many times completely override all o{her consideratioq~, ',
paveme~
Fijur
for hil~
has joir.
t~linIl
of the ]
It is i
~v{~
slab i~
~t o~
v~ ~o
. ~ultir
~ry to
~a vel
At ti
~ure t
nmoun
..- NOV-18-'94 FRI 15:58 ID:REED ENG. GROUP
TEL N0:214 358-8019
.. , . . :,...~.,'~,.,,~
J~'.~i..';.'.:.t,:. ,,'-,
~809 P05
AC 1M/$320-6¢
~2/7/70
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· I I I_ I I I I I I I
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15
PLATE 2
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NOU-18-'94 FRI 15:59 ID:REED ENG. GROUP
TEL N0:214 ~50-~19 ~809 P06
L:Z/7/7B
AC l~O/5~20-6C
(2)
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Cc)
The evaluation requires the de CamA~aCion oil
the tho ~t Xa~era, the fXexural strength
o£ the cosut~mte, aud the meduluo o£ oubsradm reaction,
(a)
aviiZdKe from couaCruct~on ~COrda, Whe~e
is mmC mtlEWle oF of questionable accuracy,
may bm dmtecuiumd by bortnaa or te~C pica in the
past ..
(b>
~ a~ Cmt~ ~ ac~rm ~ ~ C-78, 5Md
~ m e~i~ to obtm~ ~d c~a. /ucu~d ~
ob~~ suf~i~imC n~ro of ~m to eet~i~ a
re~tatiw s~le ~ ~ pr~iti~. C~tr~ion
raa~ ~ be md m a oo~ of ~te
~e to ~ ~t~ for ~ ~ conch'ce mt~gh
iue~ ~th ti~, I~c~h~ ~atio~ can ~
f~ ~ Port~ ~t ~mocia~, ~~ri~
B~~, ~et~ of ~cwete ~rt ~a~t.
at~ and glex~al st~th e~s~ a~d cm ~ c~ed
by ~ fo11~ f~a.
compressive streasth
stum~ and cemprommivo ocrmm6th or tensile mplittiu~
are
paz 91'
-'," REFERENCE