DESIGN OF 2KM FLEXIBLE ROAD PAYMENT IN MWIRI SECTOR

Abstract

The main goal of flexible road pavement is to lower the subgrade's stress to a point where it isn't affected by traffic, preventing the subgrade from deforming. A thorough final year project report covering a 2 km section has been completed at Mwiri sector, and planned. This project's primary goal is to design flexible road pavement of Mwiri sector. The site visit and data collection are the first steps in the methodology for designing the flexible road pavement. The AASHTO method is used, and input parameters such as reliability, over standard deviation, standard normal deviation, lane distribution factor, and direction distribution factor are taken from libraries and the internet. 1, 2, 3, 5, 6, and the corresponding CBR values are, in that order, 14.748%, 5.8%, 32.204%, 17.503%, 17.580%, and 27.49%. Subbase and base material have respective design CBRs of 26.79% and 72.33%. Following analysis of the relevant traffic survey, w18 =186883.3872= 0.186883*106 ESAL was calculated. The design MR of the pavement layers for the subgrade, subbase, and base were taken into consideration, and their respective pressures were 16943.67 psi, 20955.27 psi, and 39568.96 psi. There are numbers for the design structure. Subbase, base, and subgrade are in that order, 1.9, 1.7, and 1.3 for subgrade. The coefficients of the structure layers for the surface, base, and subbase are 0.44, 0.131, and 0.11, in that order. The final drainage coefficient of 1.20 indicates that the layer thicknesses for all sections are 7.62 cm for surfacing, 12.7 cm for base, and 17.78 cm for subbase.