Discussion
Which of the following statements related to properties of materials used in earth and gravel roads as per IRC:SP:77-2008 is correct?
1. The maximum liquid limit of the fines (soil) used for the wearing course of an earthen road in a seasonal wet tropic climate is 40%.
2. Wet Aggregate Impact Value should not exceed 40 and 30 when used in base and surfacing, respectively.
Answer: C
The key marks both statements as correct. The first limits the liquid limit of the fines used in the wearing course of an earth road in a seasonally wet tropical climate to 40 percent, so that the surface does not become sticky and weak when wet. The second limits the wet aggregate impact value to 40 for aggregate in the base and 30 in the surfacing. I could not check the figures in the code text, so this explanation follows the official key.
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