Asked by : Vivek Singh, Project Manager, L&T
Industry : Construction
Activity: Question posted: 06 28 2008 01:55:07 +0000, 13 answers, 27415 views, last activity 10 25 2014 06:49:39 +0000
It is said that one of its role is drainage. But drainage in which direction? Is it from median to shoulder (or otherwise)? or from top to botttom (very less possibility of water to reach GSB from bottom without damaging the top coarses)? or capillary cut off i.e. bottom to top (this will happen only after saturation of Subgrade which is disaster in itself)?
GSB is a protective layer for Subgrade which works as a drainage layer in certain conditions when all pavements layers are cracked or damaged at that time this layer drain out the water and protect the sub grade from major loss.
please give comment on my research
GSB's main roles are:-
Drainage: water find way through GSB voids towards slope under gravitational force. Subgrade, GSB and all pavement layers are constructed always in slope to facilitate drainage. Water may enter from any side during rainy season. Understood subgrade is required to be protected from water and Subgrade(compacted soil) generally being have low permeability, water drains out without affecting much depth of subgrade soil.
In case water reaches pavement through saturated soil subgrade, then also GSB will provide quick drainage to water and reduce damaging effects of water in soil.
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