Introduction to FWD database for Construction Cycle 1 (CC1)

The following information is in reference to the pavement test items located at the FAA's NAPTF:

Two FWD devices were used. The Engineering & Research International (ERI) equipment was a KUAB Model 150 with a segmented 12" loading plate and a pulse width of 27-30 msec. The FAA equipment used was a KUAB Model 240 (HWD) also configured with a 12" loading plate and a 27-30 msec pulse width.

Most of the FWD testing was completed with the FWD tow vehicle facing in the East direction (away from 0 feet). For the PCC longitudinal joint tests, the FWD tow vehicle faced the center of the test item. Please see the test item plan for better detail.

All reference offsets refer to the beginning of each NAPTF test item.  
LRS = 0'              LFS = 125'         LFC = 225' 
MFC = 325'         MFS = 412.5'      MRS = 500'
HRS = 625'         HFS = 750'          HFC = 837.5' 

FWD testing on the asphalt items are designated by traffic lanes:
LANE 1 = 25' North of C/L
LANE 2 = 15' North of C/L
LANE 3 = 5' North of C/L
LANE 4 = 5' South of C/L
LANE 5 = 15' South of C/L
LANE 6 = 25' South of C/L

Some of the asphalt tests have an "A" location designator for the centerline and are not in a traffic lane.

PCC test locations are designated:
C (center of slab), T (transverse joint), L (longitudinal joint)

FAA NAPTF test vehicle configuration
     =777 main gear left (North) of centerline.
     =747 main gear right (South) of centerline.

6/14/1999 ERI FWD tests conducted with a KUAB Model 150

For these tests, all six traffic lanes were tested. No centerline tests were conducted.
Drop location designations were all converted to F-- #'s.
NOTE: Impact loads are different from FAA HWD tests.
NOTE: Deflection sensor data columns are different from FAA HWD tests.
NOTE: During HFS tests - deflection sensor #6 failed and was replaced with deflection sensor #1. Deflection sensor #1 was located 12" in front of the load plate. Data column for #1 left blank from failure - continued through HFC tests.

1/11/2000 FAA HWD tests with KUAB Model 240

No centerline tests were conducted. Tests on traffic lanes 2 & 5 only.

HFC and HFS: HWD tests discontinued after 5/6/2000.
MFC and MFS: HWD tests discontinued after 8/31/2000.
LFC and LFS: HWD tests discontinued after 10/25/2001.
All PCC (LRS, MRS and HRS) tests discontinued after Apr. 20, 2000

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Last Update:03/03/08