Download Free Development Of A Pavement Maintenance Management System Volume Ii Airfield Pavement Distress Identification Manual Book in PDF and EPUB Free Download. You can read online Development Of A Pavement Maintenance Management System Volume Ii Airfield Pavement Distress Identification Manual and write the review.

This manual is designed to provide airfield pavement inspectors with a comprehensive reference for pavement distress identification. The information is to be used in conjunction with procedures presented in Volume I of this report to determine pavement condition and maintenance and repair requirements. The types of airfield pavement distress are listed alphabetically under the major categories of asphalt- or tar-surfaced pavements and jointed concrete pavements. Names, descriptions, severity levels, photographs, and measurement or count criteria are presented for each distress type. (Author).
This report describes the development and verification of a pavement condition index (PCI) for rating the condition of jointed concrete and asphalt-or tar-surfaced airfield pavements. The PCI, which measures airfield pavement structural integrity and surface operational condition, is calculated based on measured pavement distress types, severities, and densities obtained during an inspection of the pavement. Volume II of this report presents distress types, descriptions, severity levels, and measurement criteria for use in performing the pavement inspections.
Extensive data were collected from 327 airfield pavement features at 12 U.S. Air Force bases. The data, which provided a wide range of information on designs, materals, traffic, and climate, were used to develop PCI and key distress prediction models for both asphalt-concrete and jointed-concrete-surfaced pavements. Four satisfactory models were developed for predicting PCI for PCC and AC/PCC pavements, corner breaks in PCC pavements, and reflection cracking in AC/PCC pavements. Additional data were collected from 101 airfield pavement features at five of the Air Force bases originally surveyed to evaluate the four prediction models. The evaluation showed that the PCI prediction models are satisfactory. The reflection cracking model also provided reasonable prediction of eight pavement features. However, verification of the corner break model showed that it has a high standard deviation of prediction. Evaluation of the models for each of the five bases showed that predictions for some of the bases were much better than others, possibly because some of the material properties, climatic factors, and traffic conditions in certain bases were not well represented in the overall model. Thus, it was concluded that localized modeling could provide much more accurate predictions.
Statistical prediction models for pavement condition index (PCI) and key distresses have been developed for asphalt and jointed concrete pavements. The models were developed based on field data collected during FY76 through FY78 from 19 airfields throughout the United States. The field data included traffic, climate, pavement structure and material properties, and previous maintenance. Prediction models were developed for concrete and asphalt pavements, respectively. These models represent the first iteration of the consequence models needed to help pavement engineers select the most economical maintenance and repair (M & R) strategies and to help management efficiently allocate repair funds. Two workshops were held to determine information required by Air Force Command and Base engineers to efficiently manage airfield pavement M & R. The workshops were attended by many Command and Base engineers, as well as representatives from the Air Force Design Center and the Directorate of Management Systems. Computer and information requirements were defined and implementation alternatives for a computer-aided pavement management system were developed as a result of these workshops. (Author).
This report presents maintenance and repair (M & R) guidelines and economic analysis procedures for determining optimum repair strategies for a given airfield pavement. The procedures consist of data collection, condition evaluation, identification of feasible M & R alternatives, performing economic analysis, and selection of the optimum M & R alternative. The primary data to be collected are pavement distress types, severities, and amount. This information is then used to compute a pavement condition index (PCI), which is based on a scale of 0 to 100 and measures the pavement structural integrity and surface operational condition. Pavement evaluation is performed through a stepwise procedure which is largely dependent on the PCI and distress data, since they have been found to correlate highly with M & R needs. Other direct measurements, such as profile roughness, hydroplaning potential, and load-carrying capacity, are also included in the evaluation procedure. Guidelines for rational determination of feasible M & R alternatives are presented, based on the results from the pavement evaluation. Included in the guidelines are acceptable alternatives for the localized repair of different distress types at different severity levels. Economic analysis is performed among feasible M & R alternatives, using the present worth method. The optimum alternative is selected based on the results of the economic analysis, mission, and policy.
This volume presents the Appendices A through I. Appendix A contains the feasibility study of the consequences of maintenance and repair. Appendix B is an input guide to and flow chart of the PCI-1 computer program which calculates the pavement condition index (PCI). Appendix C contains the development of the environmental zones. Appendix D shows the questionnaires used on visits to Air Force Bases. Appendix E summarizes all PCI data collected in FY77. Appendix F presents the correlation study of PCI and profile roughness. Appendix G contains the information concerning maintenance and repair of features presented to the engineers attending the workshop. Appendix H describes an economic analysis procedure considering pavement performance. Appendix I contains the weighted performance questionnaires also presented at the workshop. (Author).