Assessing Variability of In Situ Pavement Material Stiffness Moduli
Publication: Journal of Transportation Engineering
Volume 127, Issue 1
Abstract
This paper describes research carried out to investigate pavement material-stiffness modulus variability. Detailed pavement surface deflection data were obtained from two sections of newly constructed flexible pavement in the United Kingdom, by performing tests with a falling weight deflectometer. The deflection data were back-analyzed using the computer program PADAL to obtain estimates of the in situ pavement layer stiffness moduli. The results were statistically analyzed to identify suitable test sampling regimes for end product specifications using the falling weight deflectometer. Results show that the mean values of key deflection parameters are not very sensitive to test spacing for a nominally uniform (as specified) pavement construction. However, more variability in the standard deviations of these parameters, particularly when data were sampled at more than 50 m centers (<10 samples) was found. Results from a statistical analysis of the layer stiffness moduli showed that mean layer stiffness moduli could be reasonably estimated from a low number of samples. However, many more samples would be required for a reasonable estimation of standard deviation of the layer stiffness moduli. For lengths of pavement around 500 m, tests would be required every 10 m.
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References
1.
Bendat, J. S., and Piersol, A. G. ( 1971). Random data: Analysis and measurement procedures, Wiley, New York.
2.
Bonnaure, F., Gest, G., Gravois, A., and Ugé, P. ( 1980). A new method of predicting the stiffness modulus of asphalt paving mixtures, Association of Asphalt Paving Technologists, 46, St. Paul, Minn., 64–104.
3.
Brown, S. F., Brunton, J. M., and Stock, A. F. ( 1985). The analytical design of bituminous pavements, Institution of Civil Engineers, London, 2(79), 1–31.
4.
Brown, S. F., Tam, W. S., and Brunton, J. M. ( 1986). “Development of an analytical method for the structural evaluation of pavements.” 2nd Int. Conf. on Bearing Capacity of Roads and Airfields, WDM, Bristol, U.K., 1, 267–276.
5.
Brown, S. F., Tam, W. S., and Brunton, J. M. ( 1987). “Structural evaluation and overlay design: Analysis and implementation.” 6th Int. Conf. on Struct. Des. of Asphalt Pavements, International Society for Asphalt Pavements, St. Paul, Minn., 1, 1013–1028.
6.
Collop, A. C., and Cebon, D. (1996). “Stiffness reductions of flexible pavements due to cumulative fatigue damage.”J. Transp. Engrg., ASCE, 122(2), 131–139.
7.
de Almeida, J. R., Brown, S. F., and Thom, H. H. ( 1994). “A pavement evaluation procedure incorporating material non-linearity.” Non destructive testing of pavements and back calculation of moduli, ASTM STP 1198(2), Philadelphia, 218–232.
8.
Hardy, M. S. A. ( 1990). “The response of flexible pavements to dynamic tire forces.” PhD thesis, University of Cambridge, England.
9.
Harrichandran, R. S., Mahmood, T., Raab, A. R., and Baladi, G. Y. ( 1994). “Backcalculation of pavement layer moduli, thickness and stiff layer depth using a modified Newton method.” ASTM Spec. Tech. Publ. 1198, Philadelphia, 68–82.
10.
Hoyinck, W. T., Van de Loo, J. M. M., Mulderiji, J., and Wegmeetdienst, R. K. ( 1992). “Comparative tests of FWD and Lacroix-deflectograph.” 7th Int. Conf. on Asphalt Pavements, International Society for Asphalt Pavements, St. Paul, Minn., 3, 179–193.
11.
Maestas, J. M., and Mamlouk, M. S. ( 1991). “Comparison of pavement deflection analysis methods using overlay design.” Transp. Res. Rec. 1377, Transportation Research Board, Washington, D.C., 17–25.
12.
Powell, W. D., Potter, J. F., Mayhew, H. C., and Nunn, M. E. ( 1984). “The structural design of bituminous roads.” TRRL Lab. Rep. 1132, Transportation Research Laboratory, Crowthorne, U.K.
13.
Rauhut, J. B., and Jordahl, P. R. ( 1992). “Variability in measured deflections and backcalculated moduli for the Strategic Highway Research Program Southern Region.” Transp. Res. Rec. 1377, Transportation Research Board, Washington, D.C., 45–56.
14.
Sebaaly, P. E., Tabatanee, N., and Scullion, T. ( 1991). “Comparison of backcalculated moduli from falling weight deflectometer and truck loading.” Transp. Res. Rec. 1377, Transportation Research Board, Washington, D.C., 17–25.
15.
Siddharthan, R., Sebaaly, P. E., and Javaregowda, M. ( 1991). “Influence of statistical variation in falling weight deflectometers on pavement analysis.” Transp. Res. Rec. 1377, Transportation Research Board, Washington, D.C., 57–66.
16.
Sorenson, A., and Hayven, M. ( 1982). “The Dynatest 8000 falling weight deflectometer test system.” Int. Symp. on Bearing Capacity of Roads and Airfields, Norwegian University of Science and Technology, Trondhiem, Norway, 1, 464–470.
17.
Tam, W. S., and Brown, S. F. ( 1989). “Back-analysed elastic stiffnesses: Comparison between different evaluation procedures.” Non-destructive testing of pavements and back-calculation of moduli, ASTM STP 1026, 189–200.
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Received: Sep 1, 1998
Published online: Feb 1, 2001
Published in print: Feb 2001
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