EVALUATION OF EXISTING PAVEMENT OF SYLHET- SUNAMJONG ROAD BY DYNAMIC CONE PENETROMETER

The work was conducted on that was the only way of passers and others. The evaluation of existing pavement (thickness and strength of flexible pavement of Sylhet-Sunamjong road expressed in CBR) was generally measured by DCP. The test was conducted for determining strength and thickness of pavement layers (subgrade, sub-base, base and surface) of Sylhet-Sunamjong road in its existing condition and the impacts and effective solution of its at present and future traffic loading. It was used for easy operation, least time consuming and most effective method with respect to other methods (such as CBR test). The CBR value and thickness of the pavement layers were found 80 %, 55 % and 16 % and 80 mm, 120 mm and 170 mm for surface, base and sub-base respectively by DCP. The required thickness of that layer was found 100 mm, 140 mm and 180 mm corresponding to present traffic loading. This differentiation of different layer thickness may be occurred due to improper gradation, bed quality control in design and operation etc. different type of failures of pavement manifested such as pothole formation, corrugation, depression, cracking etc. Polished Stone Value (PSV) was found in the range of 53-57.