Abstract
The ground penetrating radar (GPR) in roads is use to investigate the pavement structure layers thickness on network and project level, misaligned dowels and tie bar in concrete pavement, moisture and ground water level, air voids of asphalt layers, and to assure the quality control. Since, pavement layer thickness and materials properties are the key parameters for pavement bearing capacity and residual life determination the effective and reliable GPR analysis procedure is substantial for pavement management system. However, in order to determine asphalt layers thickness the dielectric constant or GPR velocity have to be known. The most common practice to determine the dielectric constant of specific pavement layer is to drill the cores at least every 1 km, as combination of destructive and non-destructive methods. The objective of this study is to investigate the effect of the dielectric constant to asphalt layers thickness determination accuracy. The dielectric constant of asphalt layers and GPR measurements were performed in the 27th pavement sections of the Test Road. The dielectric constant of asphalt layers calculated based on drilled cores data. Analysing the wearing, binder, and base layers separately and in combination. Finally, the errors of determined thicknesses of pavement layers were compared with actual thickness. To determine the dielectric constant influence to the asphalt layer thickness of road sections were investigated by drilling cores and determined the actual thickness. The dielectric constant based on core data and GPR measurements were compared.
Highlights
The pavement management system (PMS) based on functional and structural pavement condition of road network to assess the efficient plan of maintenance activities (Elbagalati et al, 2017)
The dielectric properties of asphalt are slightly influenced by temperature changes, as they affect the top layers of asphalt, which are exposed to direct sunlight and other environmental factors (Jaselskis et al, 2003)
The dielectric constant variation of layer mostly depends on amplitude magnitude at interface, and to accurately determine the thickness of individual asphalt layers need to consolidate the amplitudes of interface
Summary
The pavement management system (PMS) based on functional and structural pavement condition of road network to assess the efficient plan of maintenance activities (Elbagalati et al, 2017). The structural condition and bearing capacity of pavement depends on many factors related to materials type and layer thicknesses of pavement structure. The main inputs for pavement rehabilitation design are based on the layer thickness and deflection data of pavement structure, the bearing capacity and residual life. The thickness measurements of pavement layers can be used to control the construction quality of new, rehabilitated or repaired pavement. The development of reliable, accurate and fast determination method of layer thickness is on the focus of many researchers (Lahouar & Al-Qadi, 2008; Lenngren et al, 2000; Willett & Rister, 2002). The ground-penetrating radar (GPR) is a non-destructive test method capable to collect layer thickness data at short intervals and at traffic speed (Loizos & Plati, 2007; Liu et al, 2016). GPR is used to determine the air voids of asphalt layer and bonding of the layers (Sudyka et al, 2018)
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