00824543

Component

https://doi.org/10.3141/1778-13

http://scholar.google.com...ison&publication_year=2001

Ground-penetrating radar (GPR) was used to identify the variability in layer thickness for 13 general pavement study sites in North Carolina. Two data sets were collected for each of 11 sites and one data set was available for 2 additional sites. Asphalt thicknesses varied over a wide range, but the standard deviation for asphalt layers less than 6 in. (15.24 cm) thick was 1 or less. GPR results were consistent with North Carolina typical base course thicknesses, whether that base be asphalt, dense-graded aggregate, or cement-treated aggregate. Variability in base course thickness was greater than variability in the surface layer. The effects of changing layer thicknesses from the mean thicknesses to the mean +/- 1 standard deviation were examined by backcalculation and by calculating overlay thickness requirements with the North Carolina Department of Transportation overlay design procedure. Overlay thickness requirements typically changed by 3.8 mm (0.15 in.) over the range of layer thicknesses. Backcalculated moduli for asphalt and aggregate base were found to be most affected when the asphalt layer is thinner and the base course standard deviation is large. It is concluded that it is important to have an estimate of layer thicknesses for overlay design but that extensive coring is not required to obtain an adequate estimate.

This paper appears in Transportation Research Record No. 1778, Design and Rehabilitation of Pavements 2001.

English

p. 107-112

2001

Transportation Research Record

0309072425

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

Flexible pavements; Ground penetrating radar; Overlays (Pavements); Pavement layers; Thickness; Variables

North Carolina

Design; Highways; Pavements; I22: Design of Pavements, Railways and Guideways; I23: Properties of Road Surfaces

TRIS, TRB

Feb 8 2002 12:00AM

• AASHTO DRAINAGE COEFFICIENTS FOR FLEXIBLE PAVEMENTS
• ANALYSIS OF IN SITU HORIZONTAL JOINT MOVEMENTS IN RIGID PAVEMENTS
• BENEFITS AND COSTS OF JOINTED PLAIN CONCRETE PAVEMENT DESIGN FEATURES
• CHARACTERIZATION AND MODELING OF AXIAL SLAB-SUPPORT RESTRAINT
• CHARACTERIZATION OF ASPHALT CONCRETE LAYER INTERFACES
• CHARACTERIZATION OF STIFFNESS PARAMETERS IN DESIGN OF CONTINUOUSLY REINFORCED AND JOINTED PAVEMENTS
• CONSTRUCTION AND PERFORMANCE OF ALTERNATIVE CONCRETE PAVEMENT DESIGNS IN WISCONSIN
• DESIGN, CONSTRUCTION, AND MAINTENANCE GUIDELINES FOR POROUS ASPHALT PAVEMENTS
• DEVELOPMENT OF RAPID SOLUTIONS FOR PREDICTION OF CRITICAL CONTINUOUSLY REINFORCED CONCRETE PAVEMENT STRESSES
• EARLY AGE STRESSES AND DEBONDING IN BONDED CONCRETE OVERLAYS
• EFFECTS OF INTERFACE CONDITION AND HORIZONTAL WHEEL LOADS ON THE LIFE OF FLEXIBLE PAVEMENT STRUCTURES
• FLEXIBLE PAVEMENT DESIGN IN MICHIGAN: TRANSITION FROM EMPIRICAL TO MECHANISTIC METHODS
• GRANULAR OVERLAYS ON LOW-VOLUME ROADS IN WASHINGTON STATE: STRUCTURAL AND PERFORMANCE CHARACTERISTICS
• MEASURING RESILIENT MODULUS OF GRANULAR MATERIALS IN FLEXIBLE PAVEMENTS
• MODELING OF JOINTED PLAIN CONCRETE PAVEMENT FATIGUE CRACKING IN PAVESPEC 3.0
• OVERLAY PERFORMANCE IN CANADIAN STRATEGIC HIGHWAY RESEARCH PROGRAM'S LONG-TERM PAVEMENT PERFORMANCE STUDY
• PROPAGATION MECHANISMS FOR SURFACE-INITIATED LONGITUDINAL WHEELPATH CRACKS (WITH DISCUSSION AND CLOSURE)
• REPAIR OF ULTRATHIN WHITETOPPING PAVEMENTS
• THIN BONDED CONCRETE OVERLAYS IN ILLINOIS: PRELIMINARY REPORT ON PERFORMANCE
• USE OF LONG-TERM PAVEMENT PERFORMANCE DATA FOR CALIBRATION OF PAVEMENT DESIGN MODELS
• USING PAVEMENT AS SOLAR COLLECTOR: EFFECT ON PAVEMENT TEMPERATURE AND STRUCTURAL RESPONSE
• VALIDATION OF HIPERPAV FOR PREDICTION OF EARLY-AGE JOINTED CONCRETE PAVEMENT BEHAVIOR