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can we go for WBM over a granular sub base for township roads.the CBR value is 6.
Nah; you have to use FPS bricks, or cobblestones.
Aren't CMUs allowed, especially yellow ones?
Only in Australia.
If the CBR range is between 5% t0 15%, then the sub grade strength is GOOD.
Also the Capping unnecessary except on very heavily trafficked roads in these case because the CBR value is 6%.