Pavement engineers and researchers agree that valuable information can be obtained from surface deflection basin measurements of pavements. Several methods of applying a load to the pavement to cause pavement deflections have been used for many years, including static, vibratory, and impulse types of loadings. Vibratory and impulse loadings typically use velocity transducers to measure the corresponding surface deflections. Methods used to calculate pavement deflections caused by impulse loadings are complex. A good understanding of signal analysis and the theory of vibration is needed to accurately calculate pavement deflections from the transducer outputs. An overview of the various procedures required to accurately calculate these deflections is provided. A three-part study has been conducted: theoretical modeling of the transducer response, laboratory calibration of the transducer response, and coparison of independently determined deflections with those from an impulse loading test, referred to as a falling weight deflectometer. This paper appears in transportation research record no. 1293, Backcalculation of pavement moduli 1991 .
Samenvatting