Answer Posted / abhineet srivastava

1.
WMM mix is produced by Well controlled Pug Mill type plant and the WMM material is Designed product and purpose of WMM is to resist water to reach upper DBM or DGBM layer.

2.
GSB is mixed any method just to achieve desired gradation
and purpose of GSB layer is either As filter layer or as Drainage Layer to let the water out of Layer.

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