Validation of FWD Measurements in Connection with Outsourcing Contract

In the spring of 2000 Ribe County decided to outsource part of the road maintenance work. A work group was established consisting of representatives from counties and contracting companies in order to work out procedures, terms and conditions for outsourcing of road maintenance and in order to determine which parameters could be used for quality assurance. In Denmark the bearing capacity was selected as one of the parameters for quality assurance. The bearing capacity was to be measured by means of a falling weight deflectometer (FWD). In order to find out how these values could be of benefit, a decision was made to start a test project in order to determine the degree of repeatability of the FWD measuring procedure. The testing results were to form the basis of the procedures, terms and conditions to be set up for the use of bearing capacity measurements performed by means of FWD in connection with outsourcing contracts. The paper presents the testing part dealing with repeatability and the season variations in the calculated residual life and reinforcement needs. For the covering abstract see ITRD E118503.