Civil Engineering July 2021 | Vol 29 No 6

26 July 2021 Civil Engineering PROJECT PHYSIOGRAPHY Apart from the traffic loading and pave- ment material properties, climate and drainage have an important influence on pavement performance and pavement life. Details on the physiography of the project road section are given with a view to provide a backdrop for the interpretation of both the non-destructive test data and visual assessment data. Project route description The project entailed the rehabilitation of the road section from Gbarnga at km 178+720 via Ganta to the Guinea border at km 248+860 for a total length of 70.14 km. The alignment generally follows the original road, which traverses rolling terrain. The road runs adjacent to the St. Johns River between km 220+000 and Figure 2 Elevation profile of the route Temperature (°C) 30 20 10 0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Month 24.8 26.0 25.4 26.3 25.7 25.8 25.0 24.7 25.6 26.5 25.9 24.8 Figure 3 Average temperatures in °C for Ganta The state of the road prior to rehabilitation and maintenance