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composite-pavement-research-2007

composite-pavement-research-2007 - Evaluation of...

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1 Evaluation of Feasibility of Using Evaluation of Feasibility of Using Composite Pavements in Florida Composite Pavements in Florida By Means of HVS Testing By Means of HVS Testing By By Mang Tia Patricio Tapia Wasantha Kumara Chung Kumara Chung- Lung Wu Research Need Increasing truck Increasing truck loads and tire pressure pressure Rutting and surface Rutting and surface- initiated cracking in asphalt pavements asphalt pavements Advantages of WT - Resistant to rutting and surface surface- initiated cracking initiated cracking - Better long-term performance Increasing price of asphalt asphalt There is a need to effectively evaluate the feasibility and proper application of WT pavements in Florida Possible Solution: Whitetopping (WT) Types of Types of Whitetopping Conventional Conventional White White- topping topping (CWT) (CWT) Thin White Thin White- topping (TWT) topping (TWT) Ultra Ultra- thin White thin White- topping (UTW) topping (UTW) > 8” 5” - 8” < 5” How does un How does un- bonded bonded Whitetopping Whitetopping work? work? How does bonded How does bonded Whitetopping Whitetopping work? work? N.A. Effects of joint spacing Effects of joint spacing
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2 Effects of temperature differential in the concrete slab Objectives Objectives To develop analytical models for analysis of the To develop analytical models for analysis of the behavior of UTW, TWT and CWT pavements. These models are to be verified and fine These models are to be verified and fine- tuned tuned by experimental results. by experimental results. To evaluate the potential performance of the WT To evaluate the potential performance of the WT pavement test sections for use under Florida conditions. To assess the applicability of UTW, TWT and CWT techniques for rehabilitation of asphalt pavements in Florida. Approach Run full scale experiments with proper Run full scale experiments with proper instrumentation instrumentation Develop a reliable model and methodology Develop a reliable model and methodology to analyze the behavior of WT pavements to analyze the behavior of WT pavements under the effects of load and temperature under the effects of load and temperature calibrate and verify the analytical model calibrate and verify the analytical model observe relationships between performance observe relationships between performance (distresses) and measured strains and (distresses) and measured strains and calculated stresses calculated stresses Approach 12 kip load 4-inch slab -3.5E-05 -3.0E-05 -2.5E-05 -2.0E-05 -1.5E-05 -1.0E-05 -5.0E-06 0.0E+00 5.0E-06 1.0E-05 1.5E-05 0 0.5 1 1.5 2 2.5 Time, sec Strain, in/in 3D Model measured Analytical Tool to predict the behavior of WT pavements Model Calibration Design recommendations Thermocouple Gauge Wheel Path Direction 6" Slab / Mid-Top - Monday June 20 2005 1605 -25 -20 -15 -10 -5 0 5 10 0 5 10 15 20 25 30 Time (sec) Strain (x10-6) Analytical Model Analytical Model 3D Solid Element Interface Joints Analytical Model Analytical Model
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