Park West CC(02)-CS 960722ENGINEERING
DEPAR
P.O. BOX 478
25,5 PARKWAY BLVD.
COPPELL, TX 7501g
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SENT BY: .~-22-96 ;ll:08AM ; HARDY ~CCULLAI-:I~LM~ 214 304 3570;# 1/ 4
ttf'lRDY M¢CULL~H / MIM A~CHIT~E£'I'$, If lC.
July 22, 1996
Ken Griffin
CITY OF COPPELL
'255 ParkWay Bled,
Coppell, TX 7501
Re: Park West
306
Dear Mr.
~0~' ,oY~ Om
find attachcd a
the referenced project.
am our Soils Engineer, regarding pavement design for
We propose to ust over a non-stabilized subgrade at all non track
drives and parking. We plan to use t¥ 6", 4,000 p.s.i, concrete over natural subgrade at
all truck drives and fire lanes _ t, I ' ' - , ,,
If you have any question o~dditional information, please call our office.~
- L~'~ - ~_-----~,, _~, ' ~'
Sincerely,~ ~ . co
-,--~>~ ... .~.--~..~"~ ; ~- &~ ,, .~
,,,~o~an Coates .......... . ~ ~ ~ ~
c.c. Hardy McCullah
- ....................
SENT BY: 7-22-96 ;II:08AM ; HARDY MCCULLAH/ML~ 214 804 8§70;# 2/ 4
July 17, 1996
Project No. 2753
Mr, Brian E. Grant
insignia Commercial Group,
7557 Rambler Road, Suite 1300
Dallas. Texas 75231-4167
HARDY MoCULLAHIMLM A~CHiTI~CT$
JUL 1 9 1996
OALLA$:TEXR~
Re: ]:'aragon Park West Warehouse
Coppell. Texas
Dear Brian:
Provided herein are equivalent pnvcrncnt sections for the rcR.'rcnced project. I! is our
understanding the City of Coppell reqmres thc equivalent of 6-inch thick. 3.000 pounds
per square inch (psi) compressive slrcngth concrete over a 6-incl~ tldck, lime-stabilized
subgrade within areas servicing heavy n'ucl~s and the fire lanes.
Two pavement sections were provided in our reporl; a five-inch section for light-duly,
and a six-inch section lbr truck traffic Both sections were designed tbr a non-stabilized
subgrade. City of CoppcJl requires a minimum six-inch section over a lime-stabilized
subgrade.
A five-inch, 3,000- psi ccmcrete pavement over a non-stabilized sub,rede provides an
unit,oiLed number of repetitions lbr car and light truck ti'atilt. Adciitional analysis of
various sections was therefbre not pcrtimned.
The City ofCoppetl staqdard pavement m areas subjcc! to truck Irat't~c WaS considered to
consist of 6-inch thick. 3.000-p~i compressive strength concrete over 6 inches of lime-
stabilized subgrade Tl'~e analysis has consisted of determining the number et'daily
repetitions of an equivalent 18-kip axle load and a 20-year design life. The analysis
followed procedures f?orn the America, Association of S~'ate Highway Officials
(AASHO) Interim Guide
Three pav¢111e~il sections have been analyzed; thc i'clk:renced "standard" pavement, 6
inches ofq,0OO-psi concrcle, and 7 inches ol'3,0OO-psi concrete Thc latter two s¢clions
werc analyzed considering natural, rccompactcd (unstabilized) subgradc.
2'~24 S'rtlT7 D8 · .gU'ITl 400 · DALLAS. TX 75).35 · r~ t~'14] 350 5600 · ~*x 1~141 '~g,o tlrljo
SENT BY: _~_7-22-06 ;ll:00AM ; HARDY MCCULLAItf. MLM~ 214 304 3570;# 3/ 4
rnsignia Commercial Group, Inc.
Project No. 2753
luly 17, 1996
Page 2
Tile first t3ctor to be derived consists of thc modulus ot'subgrad~ ,'caclion, k, tbr both the
natural subgradc and oil top ora six-inch layer ol'lime stabilized. A value of 10() pounds per
cubic inch (pci) is recomrnended l'br thc natural subgrade. Correlations developed by the
Federal Aviation Administration (FAA) for cement-stabilized subgrade provide an cffi:ctive k
value, considering a 6-inch stabilized subgradc of 210 pct. Two hundred poi was used For the
analysis.
The second factor required to evaluate the sections consisls of the working stress of thc
concrete. This value is equal to 0.75 percent of the modulus of rupture (MR). Correlations
between the compressive strength and MR indicate that the MR can be approximated as 9 times
the square root of the compressive streagth. 'l'his analysis results in a working stress ot'370 and
425 psi tbr the 3,000- and 4,000-psi concrete, respectively.
Application of the AASI-IO homograph ~csult,~ iu the derived equivalent 18-kip axle loads shown
bclow~
Pavement
Section
Equivalent 18-Kip Axle
Loads/Day
6-inch, 3,000-psi concrete over 6" lime
40
6", 4,000 psi concrete over natural
subgrade
T', 3,000 psi concrete over natural
subgrade
4O
7O
As discussed above, the allowable daily traffic is based on a 20-year design life.
Based on this analysis, 6 inches ot'4,000-psi concrete over a nm¥1ime-.,~tal'filiT, cd subgradc is the
equivalent o1'6 inches of 3.000-psi concrete over6 inches of lime-stabilized subgrade.
SENT BY: _7-22-86 ;ll:08A~ ; HARDY ~CCULLAI~Lr~ 214 804 8870;# 4/ 4
}nsi§nia Commercial Group, Inc.
Projcct No. 2753
July 17, 1996
Pagc 3
We trust this inR'~rmation is sufficicnt tbr your use. Il'any questions arise, do not hesitate to call.
Sincerely,
Ronald F. Reed, I'. E. Sa- ~ ~ ~"' 1
~opies submitted: (I) Insignia C~,~~oup, Inc./Mr. Brian E Grant
~) Hardy McCuIIaI~MLM Architecl~Mr. Norman Coates
(I) Bob Moore Construction, Inc./Mr. Glcn l)cnham