RADIUS OF CURVATURE OF FLEXIBLE PAVEMENTS USING VARIOUS MEASUREMENT TECHNIQUES

• Main Author: .M Joko Purwanto, A
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/2745
• Institution: Institut Teknologi Bandung

The maximum deflection and deflection bowl shape parameters have proved to be useful in the diagnosis of the structural characteristics of a flexible pavement, and can be used in the determination of overlay thickness for pavement strengthening. Several items of equipment used to determine pavement surface deflections and deflection bowls are associated with particular structural parameters. The methods of measurement with the different items also vary and thus differing results can be obtained. Comparisons between deflections and minimum radius of curvature using various measurement techniques under a standard wheel load have been made. The measurements were obtained with the Benkelman Beam using transient and rebound procedures with offset readings, direct reading from a Curvature Meter, and using a Pavement Evaluation System (PES), i.e. a Benkelman Beam linked with Linear Voltage Differential Transducers (LVDT) to provide recorded graphical outputs. The measurements were carried out on a number of selected highway sections with different surfaces in the vicinity of Bandung. The surfaces tried were Hot Rolled Sheet, Asphaltic Concrete, and Penetration Macadam. Assessment of pavement surface condition was also established with measurements taken of pavement surface deformation and cracking. The results indicated that relationships for both deflection and minimum radius of curvature using the different methods of testing varied for all sites tested. Results depended on the different characteristics of the pavements under the application of the different loading types and methods of measurement. Evaluation was influenced by behaviour of the relative stiffness of the surface vis-a-vis the viscoelastic behaviour of the bitumen in the mix, creep movement on the HRS high bitumen content surfaces being significant. Different formulae and techniques for particular determinations of R min have also been examined, and the advantages and disadvantages of each approach to measurement relative to the different pavement types are discussed .