Corners Coppell-CS 860826 (2)ATE¢ Associates, Inc.
of Texas
11310 Newkirk St.
Dallas, Texas 75229
214-243-893'i
August 26, 1986
Corners of Coppell Joint Venture
C/O City of Coppell
P.O. Box 478
Coppell, Texas 75019
Attn: Mr. Ed Powell
Indianop<~is, IN
Atlanta, GA
Baltimore, MD
Birmingham, AL
Chicago, IL
Denver, CO
Newpo~, NC
Alexandria, VA
Beckley, W. VA
No~foik, VA
Subject:
Pavement Thickness
Coppell, Texas
ATEC Project No. 25-62077
Gentlemen:
ATEC Associates, Inc. is pleased to submit this letter concerning'
the pavement thickness for both light traffic parking areas and
heavy traffic drive areas at the referenced project site. This
letter was requested by Mr. Jim Anderson representing the Corners
of Coppell Joint Venture on August 25, 1986.
On July 24, 1986, ATEC submitted a letter to Woodcreek
Construction outlining the use of 12 inches of select fill as the
prepared subgrade for this project, in lieu of 6 inches of lime
stabilization. Within this letter, we described the benefits of
placing 12 inches of select fill with regard to distributing
vertical movements beneath the pavements.
Since the time the letter was prepared, ATEC has performed the
field density testing on the select fill material as it was
placed. No problems occurred with the select fill placement.
The select fill material was all compacted to 95 percent or
better of the standard proctor maximum dry density.
Using the 12 inches of select fill as our prepared subgrade
section, ATEC Associates performed a pavement design evaluation
for this project. Following is our recommended pavement
sections:
Component Thickness, Inches
Section Component
Light Traffic
Parking Area
Heavy Traffic
Drive Area
Reinforced Concrete
4 6
Select Fill Subgrade 12 12
For these reinforced concrete sections to be utilized, the
concrete used on site must exhibit the following properties:
Compressive Strength @ 28 days .
Air Content
4000 PSI min.
4 - 6%
A relatively close joint spacing of 15 feet is preferred and
separation joints from the areas around the buildings are
recommended. We also recommend using No. 3 reinforcing steel
bars placed in each direction at a spacing of 18 inches.
In our opinion, these pavement sections should perform
satisfactorily for this project. The 4 inches of concrete for
the light traffic area is as adequate as 6 inches of 3000 PSI
concrete placed on 6 inches of lime stabilized soil and
reinforced with No. 3 reinforcing steel bars placed in each
direction every 24 inches. Should you have any questions about
information on this letter, feel free to contact us.
Sincerely,
A EC ASSOCiatES,
Project Engineer
Copies (1) City of Co~~
(2) Woodcreek Construction