HWD Table

The HWD Table provides the information gathered from the Heavy Weight Deflectometer (HWD).  

The CC8 Phase 2 HWD testing was conducted prior to, during and after the traffic tests, encompassing 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 specific slabs to evaluate the load transfer efficiency. 
• Slab Corner: HWD tests performed at west corners of each slab, at the top of the Eddy current sensors (ECS), to evaluate the conditions of slab support.

The HWD test utilized the FAA KUAB Mode 150 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. Figure below shows the HWD drop locations. 

CC8 Phase 2 Overlay Test Area HWD Locations (Click to Zoom)

The FAA performed HWD tests for different purposes:

• Pre-Traffic HWD Test. This test was carried out to establish reference baselines for monitoring subsequent changes in pavement and support conditions during traffic testing. The baseline test was conducted on 09/26/2017.
• Post Seating HWD Test. This test was carried out after the seating load test on 09/28/2017.
• Post Ramp-Up HWD Test. This test was carried out after the ramp-up test on 10/4/2017.
• Traffic HWD Test. These tests were performed on a weekly basis during traffic testing.
• Post Traffic HWD Test. This test was carried out on 1/12/2018 on the north items and on 2/2/2018 on the south items, after the completion of traffic testing.

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HWD Data