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AIRPORT TECHNOLOGY R & D BRANCH Falling Weight Deflectometer Tables Falling Weight Deflectometer (FWD) tests are conducted on top of the pavement test
section on a quarterly basis. FWD tests are performed for several
purposes: more about FWD The Falling Weight Deflectometer (FWD) device is used regularly to test the pavement test section. The FWD use is divided into three categories:1. Pavement Perfomance: Pavement surface deflection is obtained at specific locations for every season. This provides comparative data that can be used to a) compare pavement response at different times of the year, b) compare pavement deflection against pavement performance determined by field surveys, and c) backcalculate pavement structure material properties. 2. Joint Transfer: Studies of joint transfer are a very important part of this project. Some joint gages have been installed at specific joints and are used for these studies. The FWD device complements the use of the joint gages at those specific locations by providing data for other all the other joints (with no sensors). 3. Gage Verification: The FWD is used to test the functioning the sensors on a periodic basis. The device is placed at locations on or near the top of each sensor and the pavement is loaded. Sensor response is obtained and checked for reasonableness. Contact the Project Lead: Dr. David Brill, AAR-410 Last Update: 01/28/03 |
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