HomeMy WebLinkAboutCT 80-34; PALOMAR AIRPORT BUSINESS PARK; PAVEMENT DESIGN RECOMMENDATIONS; 1981-07-29•
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I <' I <..-' Ii ~' 7 ROBERT PRATER ASSOCIATES
Consulting Soil; Foundation & Geological Engineers
July 29, 1981
218-3D,4126
Palomar Airport Business Park
6361 Yarrow Drivel Suite A
Carlsbad, California 92008
Attention: Mr. Bernard W. Gi Imore
Re: Pavement Design Recommendations
Palomar Airport Business Park -Phase '·1
City of Carlsbad Tract No. 80-34
Carlsbad, California
Gentlemen:
Robert R. Pratf)r, c.E. 7942-7980·
Wm. Dovid Hespeler, c.E.
JUL 3 J ~9at
CI~ Of CARLS&8Q
Engmeerlng peBartmeot
In accordance with the City of Carlsbad requirements, we have developed design recom"';
mendations for asphalt concrete pavements for Corte Del Abeto from approximate Stations
0+34 to 10 + 00 and for Corte Del Nogal from approximate Stations 8 + 50 to 13 + ()O~ .
Bulk samples representative of the subgrade soils were obtained and R(Resistcmce)-value
tests were performed to evaluate the pavement subgrade quality of the on-site soils. The
results of the tests are attached and indicate design R-values of 12 for Corte Del Abeto
and 54 for Corte Del Nogal. The stabilometer charaderisticsof the materials governed
the design R-values. Based on a Traffic Index number of 6.5 we have developed the fol-
lowing recommended pavement sectIon alternatives usting Test Method 301 of the State
of California, Department of Transportation.
TABLE I
RECOMMENDED ASPHALT CONCRETE PAVEMENT DESIGN ALTERNATIVES
Location
Corte Del Abeto
(Stas. 0 + 34 to 10 + 00)
(R = 12)
(Continued)
Asphalt
Concrete
(Inches)
3.5
4.0
Pavement Components
Aggregate Base D. G. Base
Class 2 Class· 3
(Inches) (Inches)
13
12
70505 Roselle Street, San Diego, California 92727 • (714) 453-5605
Total
Thickness
(Inches)
16.5
16.0
•
TABLE I (Continued)
4tuly 29, 1981
218~3D;. 4126
Page 2
RECOMMEND ED-AS Pj;JALT -CONCRETFl'AV'EMENT DESIGN ALTERNATIYES
Pavement Components
.Asphalt Aggregate Base b. G. Bose Total
Concrete Class 2 Class 3 Thickness
Location (Inches) (Inches) (Inches) (Inches) ..
Corte Del Noga I
(Stas. 8 + 50 to 13 + 00) 3.5 4 -.... -7 ... 5
(R = 54) 4.0 4 8 •. 0
Asphalt concrete, base materials, and preparation of .the subgrade should conf6~m to ~nd
be placed in accordance with the requirements of the State of California7 Department of
Transporation, Standard Specifications, January 1981 edition, exc~pt that the test
method for compaction should be determined by ASTM D 1557-78 •. Preparation of the
subgrade and placement of the base material should be performed under the observation
of the soil engineer's representative.
Our services consist of professional opinions and recommendations made inac~ordance
with generally accepted soil and foundation engineering principles and practices. This
warranty is in lieu of ail other warranties either express or implied~ .
If you have any questions, please call.
Very truly yours,
ROBERT PRATER ASSOCIATES
~~hL
John LaBar, RCE No. 22,385
JLB;cc
Attachments
Copies: Addressee (2)
Henry Worley Associates, Attn: Mr~ Henry Worley (2)
City of Carlsbad Engineering Dept., Attn: Mr.M. E. Bacon (2)
'. • 218-3D
DATE:--July 29,-1981"
SAMPLE IDENTIFICATION: No.1
Corte Del Abeto, Station 7 + 00
RESULTS OF R(RESISTANCE}-VALUE TEST
SPECIMEN A B C
Water Content
At Compaction (%) 15.4 17.3 19 •. 1
Dry Densi ty (pd) 116.9 112.2 108.5 .. .... Exudation
Pressure (psi) 696 410 298
Stabi lometer
R-value 32 18 12
Expansion Pressure
Thickness (ft.) 0.76 0.73 0.67
ASSUMED Tl: 6.5
ASSUMED GRAVEL FACTOR: 1.5
R-VALUE AT 300 PSI EXUDATION PRESSURE: 12
R-YALUEBY EXPANSI,ON PRESSURE: 41 -----
R-VALUE AT EQUILIBRIUM: 12
"' • • ~18-3D
DATE: July 29, 1981
SAMPLE I DENHFICA110N: No.2
Corte Del Nogal, Station 11 + 00
RESUL IS OF R(RESIST ANCE)-VALUE TEST
SPECIMEN A B· C
Water Content
At Compaction (%) 14.6 16~0 18.2
Dry Densi ty (pcf) 113.6 111.8 107.6
"-"-Exudation
Pressure (psi) 430 265 160
Stabi lometer
R-value 70 48 13
Expansion Pressure
Thickness (ft.) 1.07 0.37
ASSUMED II: 6.5
ASSUMED GRAVEL FACTOR: 1.5
R-VALUE AT 300 PSI EXUDATION PRESSURE: 54 -----
R-VALUE BY EXPANSION PRESSURE: 60
R-VALUE AT EQUILIBRIUM: 54
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