Answer Posted / kamal chhetri, material engine
GSB= it is the foundation layer of the road pavement, comprising the materials of required sizes as specified in the gradation table, having LL <25,PI <6 and and CBR>30% in order to meet the strength, filter and drainage requirement of the granular sub base and compaction more than 95%
WMM= It is the structural component of the road pavement, comprising the clean and crushed material of sizes as per the gradation required, having PI<6 and strength of the aggregates should not be less than 30% by LAA or AIV and compaction >98%.
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