Rut depth ‎detection for al-kut- Baghdad rural highway using ground penetrating radar

It is very important to determine the layer/ layers because the rutting distress in the highways pavement those suffer from rutting distress, so an accurate rehabilitation strategy is selected. In this study, the Ground Penetrating Radar (GPR) used in detection of rutting distress that Al-Kut Baghdad rural highway suffers from, using 800 MHz antenna. The selected highway suffers from excessive rutting (2-4 cm). According to the processed GPR data, it is discovered that the sub-base layer causes the rutting in the pavement. The GPR results led to a need of conduction of a structural evaluation to the sub-base layer by conducting CBR test, the CBR result of the sub-base layers is (18.7 Mpa) while the Iraqi specification for roads and bridges (SCRB, 2003) state that minimum CBR value for the sub-base type B is (35 Mpa), this result confirmed the GPR results.