A flexible pavement has 34505678.91 csa and a CBR value of 4%. What would be the thickness of the base course of the pavement?

A flexible pavement has 34505678.91 csa and a CBR value of 4%. What would be the thickness of the base course of the pavement? Correct Answer 250 mm

Using the design charts given in IRC 37-2012, the thickness of various layers can be found out. The csa must be converted to msa i.e. million standard axle in order to read the design charts. So, 34505678.91 csa would correspond to 34505678.91×10-6 msa i.e. 34.51 msa. The design chart for 4% CBR can be looked up in IRC 37-2012 under the title Plate 2. The thickness of based courses is 250 mm for 30 msa as well as 50 msa, therefore there is no need to interpolate the thickness of base course for 34.51 msa.
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