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A NEW DEVICE TO RECORD THE DEFLECTION BASIN ON ROAD PAVEMENTS

In Portugal the evaluation of road pavement bearing capacity is usually performed through the analysis of the recorded deflection basin produced by a 9-ton axle of a test vehicle. The deflection transducer is a modified Benkelman beam, connected to a x-y recorder. This procedure is, however, significantly time-consuming since it implies truck stopping at all test points. In order to increase test efficiency without losing accuracy or lessening the amount of information given by the test, research has been carried out to obtain solutions that do not require a fixed reference on the pavement, thus allowing to make the measurements with the truck in continuous movement. Several studies and experiments have been conducted by using accelerometers (like in some existing deflectographs) or with gyroscope (to measure the deflection basin slope) but results have not been considered good enough. A new type of device has finally been developed, which measures the difference between the slopes of any two consecutive small stretches of the deflection basin, whose shape is then obtained through a double space integration. This kind of integration presents significant advantages over time integration used with accelerometers. (Author/TRRL)