Backcalculation of Thermally Deformed Concrete Pavements

Abstract

Nonlinear explicit three-dimensional finite element (3-D FE) modeling is used to investigate the performance of the falling weight deflectometer (FWD) test in the evaluation of layer moduli of jointed plain concrete pavements (JPCP) subjected to nonlinear thermal gradient through the slab thickness. Concrete slab separation from the base, in-plane friction at the concrete-base interface, the gravitational forces, and the interface characteristics between dowel bars and surrounding concrete are all represented in the 3-D FE model. Experimental verification of the model is obtained through comparison of the 3-D FE generated response to (a) the FWD measured deflection basin and (b) the measured response of an instrumented rigid pavement section located in Ohio to a loaded truck moving at 21.8 m/s (48 mph). Several cases of linear and nonlinear thermal gradients are applied to the model, and deflection basins are obtained. Two backcalculation programs, MODULUS 5.0 and EVERCALC 4.0, are used for prediction of the layer moduli in each case, and the values are compared. The results indicate that thermal curling of the slab due to negative thermal gradient has little effect on the accuracy of backcalculated moduli. Warping of the slab due to positive thermal gradient greatly influences the measured FWD deflection basin and leads to significant errors in the backcalculated moduli. These errors may be minimized if the time an FWD test is conducted falls between the late afternoon and midmorning (from 5:30 p.m. to 9:30 a.m. during summer in West Virginia).

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References

Teller

L. W.

, and Sutherland

E. C.

. The Structural Design of Concrete Pavements, Part 2: Observed Effects of Variations in Temperature and Moisture on the Size, Shape, and Stress Resistance of Concrete Pavement Slabs. Public Roads, Vol. 16, No. 9, 1935, pp. 169–197.

Richardson

J. M.

, and Armaghani

J. M.

. Stress Caused by Temperature Gradient in Portland Cement Concrete Pavements. In Transportation Research Record 1121, TRB, National Research Council, Washington, D.C., 1987, pp. 7–13.

Owusu-Antwi

E. B.

, Meyer

A. H.

, and Hudson

W. R.

. Assessing Load Transfer Across Joints and Cracks in Rigid Pavements Using the Falling Weight Deflectometer. Report No. 460-2, Center for Transportation Research, The University of Texas at Austin, 1990.

Hveem

F. N.

A Report of an Investigation to Determine Causes for Displacement and Faulting at the Joints in Portland Cement Concrete Pavements. State of California Report, Division of Highways, Materials, and Research Department, 1949.

Lewis

K. N.

, and Harr

M. E.

. Analysis of Concrete Slabs on Ground Subjected to Warping and Moving Loads. In Highway Research Record 291, TRB, National Research Council, Washington, D.C., 1969, pp. 194–211.

Tang

, Zollinger

D. G.

, and Senadheera

. Analysis of Concave Curling in Concrete Slabs. Journal of Transportation Engineering, Vol. 119, No. 4, 1993, pp. 618–633.

Ioannides

A. M.

, and Salsilli-Murua

R. A.

. Temperature Curling in Rigid Pavements: Application of Dimensional Analysis. In Transportation Research Record 1227, TRB, National Research Council, Washington, D.C., 1989, pp. 1–11.

Korovesis

G. T.

Analysis of Slabs-on-Grade Pavement Systems Subjected to Wheel and Temperature Loadings. Ph.D. Dissertation. University of Illinois, Urbana, 1990.

Taheri

M. R.

, Zaman

M. M.

, and Khanna

. Dynamic Response of Concrete Airport Pavements to Temperature Induced Warping. Proc., 16th Southeastern Conference on Theoretical and Applied Mechanics, pp. II.10.17–26, 1992.

10.

Choubane

, and Tia

. Nonlinear Temperature Gradient Effect on Maximum Warping Stresses in Rigid Pavements. In Transportation Research Record 1370, TRB, National Research Council, Washington, D.C., 1992, pp. 11–19.

11.

Harik

I.E.

, Jianping

, Southgate

, and Allen

. Temperature Effects on Rigid Pavements. Journal of Transportation Engineering, Vol. 120, No. 1, 1994, pp. 127–143.

12.

Shoukry

S. N.

, and William

. 3-D FEM Analysis of Load Transfer Efficiency. Proc., 1st National Symposium on 3-D Finite Element Modeling for Pavement Analysis and Design, Charleston, W.Va., 1998, pp. 40–50.

13.

Mirambell

Temperature and Stress Distributions in Plain Concrete Pavements Under Thermal and Mechanical Loads. Proc., 2nd International Workshop on Design and Rehabilitation of Concrete Pavements, Siguenza, Spain, 1990, pp. 121–135.

14.

Channakeshava

, Barzegar

, and Voyiadjis

G. Z.

. Nonlinear FE Analysis of Plain Concrete Pavements with Dowel Joints. Journal of Transportation Engineering, Vol. 119, No. 5, 1993, pp. 763–781.

15.

Masad

, Taha

, and Muhunthan

. Finite Element Analysis of Temperature Effects on Plain-Jointed Concrete Pavements. Journal of Transportation Engineering, Vol. 122, No. 5, 1996, pp. 388–398.

16.

Shoukry

S. N.

, Selezneva

O. I.

, and Martinelli

D. R.

. Dynamic Performance of Composite Pavements Under Impact. In Transportation Research Record 1570, TRB, National Research Council, Washington, D.C., 1997, pp. 163–171.

17.

Lee

C. J.

, Sutton

C. D.

, and White

T. D.

. Rated Axle Load Enhancement System. Report FHWA-INDOT-JHRP-97/7. FHWA, U.S. Department of Transportation, 1997.

18.

Hallquist

J. O.

LS-DYNA3-D Theoretical Manual. Report 1018, Rev. 2, Livermore Software Technology Corporation, Houston, Tex., 1993.

19.

Kennedy

C. J.

Material Nonlinear and Time Dependent Effects on Pavement Design for Highways Multi Wheel Vehicles. Proc., 1st National Symposium on Finite Element Modeling for Pavement Analysis and Design ( Shoukry

S. N.

, ed.), Charleston, W.Va., 1998, pp. 85–92.

20.

Simmons

J. W.

, and Kenis

. 3-D FEM of Fatigue Crack Growth in Pavements. In Proc., 1st National Symposium on Finite Element Modeling for Pavement Analysis and Design ( Shoukry

S. N.

, ed.), Charleston, W.Va., 1998, pp. 85–92.

21.

Uddin

, Zhang

, and Fernandez

. Finite Element Simulation of Pavement Discontinuities and Dynamic Load Response. In Transportation Research Record 1448, TRB, National Research Council, Washington, D.C., 1994, pp. 100–106.

22.

Mallela

, and George

K. P.

. Three-Dimensional Dynamic Response Model for Rigid Pavements. In Transportation Research Record 1448, TRB, National Research Council, Washington, D.C., 1994, pp. 92–99.

23.

Sargand

S. M.

, and Beegle

. Three Dimensional Finite Element Software Development and Verification Case Study. Presented at 1st National Symposium on 3-D Finite Element Modeling for Pavement Analysis and Design, Charleston, W.Va., 1998.

24.

Nasim

H. A.

, Karamihas

S. M.

, Gillespie

T. D.

, Hansen

, and Cebon

. Behavior of a Rigid Pavement Under Moving Dynamic Loads. In Transportation Research Record 1307, TRB, National Research Council, Washington, D.C., 1991, pp. 129–135.