01518445

Component

https://doi.org/10.3141/2457-08

Bonded concrete overlays of asphalt (BCOA), previously known as ultrathin whitetopping, have become increasingly common in Illinois in the past 15 years. No methods exist for assessing in situ properties under loading for this type of overlay. A procedure to backcalculate layer properties from falling weight deflectometer tests does exist for concrete slabs on grade with infinite dimensions, but this method is not applicable to finite-sized BCOA slabs with multiple layers and interfaces. Based on two-dimensional finite element modeling of BCOA pavements, a backcalculation procedure was derived for a range of expected slab sizes, effective concrete pavement thicknesses, joint load transfer efficiencies, and foundation layer stiffnesses. The backcalculated effective concrete thickness quantifies the load-carrying capacity of the BCOA pavement, variation of the structural capacity as a function of distance along the roadway, and potentially the condition of the concrete–asphalt bond interface and the underlying asphalt concrete layer. Application of the BCOA backcalculation procedure to falling weight deflectometer data collected from several projects in Illinois confirmed the reasonableness of the procedure through observed performance and estimated layer thicknesses from construction.

01551907

14-4476

English

pp 72–79

2014

Transportation Research Record: Journal of the Transportation Research Board

9780309295444

Print

Figures (7) ; References (27) ; Tables (4)

Asphalt pavements; Backcalculation; Concrete overlays; Falling weight deflectometers; Finite element method; Thickness

Bonded concrete overlays; Ultra-thin whitetopping

Illinois

Design; Highways; Pavements; I22: Design of Pavements, Railways and Guideways

PRP, TRIS, TRB, ATRI

Jan 27 2014 3:33PM

• Alternative Approach for Interpreting Traffic Speed Deflectometer Results
• Backcalculation of Asphalt Concrete Modulus Master Curve from Field-Measured Falling Weight Deflectometer Data: Using a New Time Domain Viscoelastic Dynamic Solution and Genetic Algorithm
• Comparative Testing of Lasers for Ride Quality Measurement on Hot-Mix Asphalt Pavements
• Establishment of Relationship Between Pavement Surface Friction and Mixture Design Properties
• Evaluation of Widely Used Hydroplaning Risk Prediction Methods Using Florida’s Past Crash Data
• Incorporating Surface Microtexture in the Prediction of Skid Resistance of Flexible Pavements
• Influence of Aggregate Base Layer Variability on Pavement Performance
• Measurement of Pavement Roughness Using Android-Based Smartphone Application
• Pavement Raveling Detection and Measurement from Synchronized Intensity and Range Images
• Performance Predictions of Rutting for the National Center for Asphalt Technology Test Track
• Scaling Relationships of Dissipation-Induced Pavement–Vehicle Interactions
• Study of Cornering Maneuvers of a Pneumatic Tire on Asphalt Pavement Surfaces Using the Finite Element Method
• Subgrade and Foundation Dynamic Performance Evaluation by Means of Lightweight Deflectometer Tests
• Surface Drainage Evaluation for Rigid Pavements Using an Inertial Measurement Unit and 1-mm Three-Dimensional Texture Data