The group index of the soil is found to be 5 and the traffic condition expected is medium traffic. What would be the combined thickness to be provided on the pavement for bearing the loads to ensure smooth conduct of traffic.

The group index of the soil is found to be 5 and the traffic condition expected is medium traffic. What would be the combined thickness to be provided on the pavement for bearing the loads to ensure smooth conduct of traffic. Correct Answer 34 cm

Since the group index values and the traffic condition is already provided, the thickness can be directly read from the design chart. The chart has been provided by the Highway Research Board, USA. A sample of the graph showing the curve for combined thickness of the surface, base and sub-base course for medium traffic condition is shown below. The combined thickness of the surface, base and sub-base course for group index of 5 can be obtained as 34 cm from the chart.
Bissoy MCQ

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