The Full Form GBS is Granular Sub-Base.
Granular Sub Base(GSB) is natural or designed construction material, used for road construction as a sub-base layer. Granular Sub Base is a layer in road foundation just above the compacted sub-grade layer. GSB or granular sub-base prevents capillary water from rising; its particle size is so designed that the capillary action stops and cant go beyond GSB layer. Secondly, it works like a drainage layer where water can pass without damaging other road layers.
The following sets of equipment are necessary for the for GSB construction work.
GSB
means
Granular Sub-Base
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