HWD Table

The HWD Table provides information obtained from the Heavy Weight Deflectometer (HWD) testing conducted during CC8 Phase 4.   

HWD_ID	HWD test number
GroupID	Test section number
DateTime	Date and time of test (Atlantic City, NJ local time)
Station_FT	Station test was taken at in feet
Offset_FT	Offset from centerline test was taken at (negative = north, positive = south) in feet
Load_LBS	Test load applied by the HWD in pounds
Loc_IN	Location of sensors 0-7 from the applied load in inches
D_MILS	Deflection measured at each sensor in mils
AirTempDEGF	Air temperature as measured by the HWD in degrees F
PaveTemp_DEGF	Pavement temperature as measured by the HWD in degrees F
Comments	Additional information on how the test was performed

 

The HWD testing encompassed various locations and purposes:

• Slab Center: HWD tests were carried out at the center of each slab to evaluate the properties of pavement layers throughout the traffic testing.
• Slab Edge: HWD tests were performed at the edges of slabs under the wheel paths to evaluate the load transfer efficiency. These tests were only performed on the inner lane slabs.
• Slab Corner: HWD tests performed at the corners of each slab to evaluate the conditions of slab support.

The HWD test utilized the FAA KUAB with one sensor under the load plate, one sensor at 12 inches in front of the load plate and six sensors located behind the load plate at 12-inch intervals. At each test location, four drops were applied with a target loading sequence of: 12,000 lbs., 24,000 lbs., and 36,000 lbs. with an approximate 36,000-lb seating load.

The FAA performed HWD tests for different purposes:

Uniformity HWD Tests

These tests were conducted on 11/30/2017 at the center of the PCC slabs. The uniformity tests were not intended for acceptance of the test pavements.

Baseline HWD Tests

These tests were carried out to establish reference baselines for monitoring subsequent changes in pavement and support conditions during traffic testing. The baseline tests were conducted on the following dates:

• On 08/20/2018 on the outer lane slabs prior to trafficking. Test locations are shown in Figure 1.
• On 8/24/2018 after completion of static load test. Test locations are shown in Figure 1.
• On 10/15/2019 on the inner lane slabs prior to trafficking. Test locations are shown in Figure 1.
• On 4/3/2023 on the inner lane slabs before resuming the traffic test. Test locations are shown in Figure 2.

Traffic HWD Tests 

These tests were performed on a weekly basis during traffic testing. They included:

• From 8/31/2018 to 5/17/2019 on the north outer lane. Test locations are shown in Figure 1.
• From 8/31/2018 to 10/15/2019 on the south outer lane. Test locations are shown in Figure 1.
• From 10/25/2019 to 3/9/2019 on the inner lanes. Test locations are shown in Figure 1.
• From 4/14/2023 to 6/5/2023 on the inner lanes. Test locations are shown in Figure 2.

 

Note: The HWD testing was carried out from East to West in distinct data collection lines. For Slab Edge and Slab Corner testing, the load plate was placed to the West of the joints, while the sensors were positioned to the East of the joint.

 

Figure 1. Baseline and Traffic HWD Test Locations

 

Figure 2. Baseline and Traffic HWD Test Locations for the Inner Lanes in 2023 Testing

 

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HWD Data