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A Fast Falling Weight Deflectometer (FFWD) is a FWD with pneumatic or electric actuators rather than hydraulic, making the mechanics several times faster. A Heavy Weight Deflectometer (HWD) is a falling weight deflectometer that has higher loads (typically 300 kN to 600 kN), used primarily for testing airport pavements.
The physical properties of a stretch of pavement can be tested using a falling weight deflectometer. Several design methods have been developed to determine the thickness and composition of road surfaces required to carry predicted traffic loads for a given period of time. Pavement design methods are continuously evolving.
The Southwark Emery universal testing machine has a capacity of 600,000 lb (3 MN) and can test specimens up to 18 ft (5.5 m) tall. Carleton Lab, an endowed research center overseen by the Trustees of the Robert A. W. Carleton Laboratory, is one of the largest labs on Columbia’s Morningside Heights campus.
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Defense Secretary Pete Hegseth with President Donald Trump at a news conference Thursday about the midair collision.
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