The objective of this study was to determine the feasibility of developing a device or technique to provide rapid measurement of parameters indicative of roadway condition or structural capacity.
Currently existing equipment is inadequate for making meaningful measurements with speed and convenience. Consequently, a new system called "impulse testing" has been proposed and its concepts proved in this study. This system incorporates new techniques of non-destructive testing, and is adaptable to mechanization for automatic operation. The system is based on the deflection of the pavement under impulse loading, and also on the energy propagation characteristics of the pavement. These two parameters are combined to formulate a quantity which is called the impulse index and which has a high degree of correlation with the structural properties of the pavement.