Backcalculation of pavement moduli through the utilization of the falling weight deflectometer (FWD) is used for pavement monitoring and evaluation. The performance and structural condition of nine flexible pavement test sections built in Bedford County, Virginia, have been monitored over the past 5 years using FWD. The nine sections include three groups with aggregate base layer thicknesses of 100, 150, and 200 mm, respectively. Sections 1, 4, and 7 are control, whereas Sections 2, 5, 8 and 3, 6, 9 are stabilized with geotextiles and geogrids, respectively. The FWD testing used five double-load drops ranging from 26.5 to 58.9 kN. The deflection basins obtained from the testing have been analyzed using the ELMOD backcalculation program to find the pavement structural capacity and to detect changes in the aggregate resilient modulus. The analysis shows a reduction in the backcalculated resilient modulus of the 100-mmthick base layer. The reduction was 33 percent over 5 years for the nonstabilized section compared with the geosynthetically stabilized section. The reduction in base layer resilient modulus may have resulted from subgrade fine migration into this layer as confirmed by excavation. The study confirms the effectiveness of using woven geotextile as a separator in a pavement system built over weak subgrade. This supports the continuous rutting measurements and ground truth excavation conducted in late 1997.


    Access

    Download

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Assessment of Falling Weight Deflectometer Data for Stabilized Flexible Pavements


    Additional title:

    Transportation Research Record: Journal of the Transportation Research Board


    Contributors:


    Publication date :

    2000-01-01




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English





    Dynamic Viscoelastic Analysis of Falling Weight Deflectometer Deflections for Rigid and Flexible Pavements

    Khazanovich, Lev / Booshehrian, Abbas | Transportation Research Record | 2019


    Issues in simulating falling weight deflectometer test on concrete pavements

    Kuo, Chen-Ming / Lin, Chih-Chiang / Huang, Cheng-Hao et al. | Springer Verlag | 2015


    Use of FWD device (Falling Weight Deflectometer) on concrete pavements

    Mahnke, P. / Lentz, G. / Polish Road and Bridge Research Institute| German Road and Transportation Research Associations | British Library Conference Proceedings | 1993