CONFIDENTIAL BAA 192001 BAA4413 QUESTION I 10 MARKS a) Figure 1 below shows a common cross...
CONFIDENTIAL BAA 192001 BAA4413 QUESTION I 10 MARKS a) Figure 1 below shows a common cross section of a railroad track Rails Tie Ballast Sulgrade Figure 1 : Rail Road Track Based on the figure, describe the TWO (2) functions of each of these items Rails Tic Ballast (3 marks) b) The group of consultant is given a task to carry out the surface design of the new 4 lanes road. The supplementary data that includes traffic survey data as in Table 1 and sub-grade testing data are presented below. Based on the given data, recommend traffic and sub-grade category as well as suitable type of materials and the thickness of each layer in accordance 10 JKR Manual on Pavement Design (ATJ 5/85 - Pindaan 2013). Percentage of Commercial Vehicles -15% • Type of Terrain - Rolling • Design Period • Traffic Growth -40% • Sub-grade Testing Data 2 CONFIDENTIAL BAL19300 BAMI - 20% © CBR Mean O CBR Standard Deviation o Normal Deviate, 85% - 1320