Asphalt Concrete (AC) layer of a highway pavement is typically constructed by successive compaction of multiple thin layers. After construction, these layers may not deteriorate at the same rate over the years due to a number of factors such as moisture, aging and so on. Proper selection of pavement maintenance and rehabilitation strategy is dependent on the structural condition evaluation of these thin AC layers. Therefore, this study is performed to evaluate multiple thin AC layers of an instrumented flexible pavement section at Mile Post (MP) 141 on Interstate 40 (I-40) near Albuquerque, New Mexico. To facilitate, nondestructive tests such as Ground Penetrating Radar (GPR), Falling Weight Deflectometer (FWD), and Portable Seismic Property Analyzer (PSPA) were conducted on this pavement section. AC layer thicknesses were predicted by the 2.0 GHz air-coupled GPR antenna, and the predicted thicknesses are fairly accurate based on a comparison with core thicknesses at selected locations. In addition, the GPR predicted smaller thicknesses for the top AC layer at some locations which were marked as delaminated zone. Later, the AC thickness and modulus interpretation from the PSPA test also confirmed those delaminated locations. It was observed that the PSPA is the most effective for the evaluation of the top AC layer. In case of modulus prediction of all thin AC layers together, the FWD test has been proved to be the best option. In addition, accuracy of modulus prediction by the FWD test is enhanced due to incorporation of the GPR predicted layer thicknesses. Finally, it is recommended to conduct the combined GPR, PSPA, and FWD tests on a flexible pavement to ensure an efficient and accurate structural evaluation of thin AC layers.
1. Angio, C., Manacorda, G., Pinelli, G., and Benedetto, A. “GPR Automatic Inspection of Road Pavement Layer Thickness.” 3rd International Symposium on Rehabilitation and Maintenance of Roads MAIREPAV, Guimares, Portugal, 2003.
2. Al-Qadi, I.L., and Lahouar, S. “Ground Penetrating Radar: State of the Practice for Pavement Assessment”, Materials Evaluation, American Society for Nondestructive Testing, Vol. 62, No. 7, pp. 759-763, 2004.
3. Willett, D.A., Mahboub, K., and Rister, B. “Accuracy of Ground -Penetrating Radar for Pavement Layer Thickness Analysis”, Journal of Tr ansportation Engineering, ASCE, Vol. 132, No. 1, pp. 96-103, 2006.
4. Ahmed, M. U., Tarefder, R. A., and Maji, A. K. (2014). Variation of FWD Modulus Due to Incorporation of GPR Predicted Layer Thicknesses . Proceedings of the 15th International Conference on Ground Penetrating Radar, Brussels, Belgium, June 30– July 4.
5. Ahmed, M. U. “Evaluation of FWD Software and Deflection Basin for Airport Pavements.” M.Sc Thesis, Department of Civil Engineering, University of New Mexico, 2010.
6. Azari, H. Optimization of Stress Wave-Based Nondestructive Methods in Identifying Deterioration in Concrete Structures . PhD Dissertation, University of Texas-El Paso, 2013.
7. Romero, F., Barnes, C. L., Azari, H., Nazarian, S., and Rascoe, C. D. “ Validation of Benefits of Automated Depth-Correction Method: Improving Accuracy of Ground-Penetrating Radar Deterioration Maps” Transportation Research Record; Journal of Transportation Research Board (TRB) , 2522, 2015
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