Airfield rolling weight deflectometer

The ARWD was originally developed by Quest Integrated, Inc., to test the deflection of airfield pavements. 

The ARWD system is composed of a towed trailer that is capable of travelling with speeds of 35 km/h. A long loading platform is used to load the pavement through the trailer s rear double axle with a single wheel total load of 80 kN (18 kips). A horizontal 10 m (33 ft) long 

The deflection is measured by using a laser triangulation and parallax method. The laser sensors are responsible for measuring the distance to the pavement surface, and the deflection is calculated from the difference between the slope of the beam and the slope of the pavement at the initial point and after the device moves to the next point. The device is provided with a data acquisition system used for data collection, storage and analysis (Elseifi et al. 2012). 

Although the ARWD device is suitable for airfields, the device needs to be modified for highways before it can be implemented (Arora et al. 2006). 

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