oa Pavement Rehabilitation Assessment Using Cone Models For Reduction Of Impulse Response Field Data

The Impulse response method was used in the assessment of an undersealing<br>pavement rehabilitation program undertaken to repair a rigid pavement with extensive<br>loss of subgrade support. Due to significant deviation of the pavement response from the<br>current single degree of freedom (SDOF) model, the cone model was used in the data<br>reduction. The Cone model accounts for reflections within pavement layers resulting in a<br>better fit to the response curve of the pavement. The effectiveness of the undersealing<br>program was assessed by comparing changes in subgrade modulus before and after<br>grouting.<br>This paper presents the theoretical background of the cone model and their<br>effectiveness in identifying changes in pavement subgrade support conditions. The<br>advantages of using cone models as an alternative model to the SDOF model is also<br>discussed.