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Activity:
Question posted: 06 28 2008 01:55:07 +0000,
8 answers, 5376 views, last activity
08 03 2011 09:29:30 +0000
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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)?
Role of GSB is like a shock absorver
But can we transport the GSB material in dry condition from plant to site? if yes then how can we control the moisture by adding water at site? and if no then wats solution for long distance materials transportation. which is code/Morth section refers regarding the same? Thax please reply
GSB's main roles are:-
Load bearing/distribution
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.
filter layer will minimise the damages...............
But will the water reach the drainage layer without affecting the pavement, as detailed in the question?
Water is present in pavement materials in the form of free water, capillary water, bound moisture, or water vapor. Free water is the form of most concern because it can decrease the strength of the pavement and is the only form of water that can be significantly removed by gravity drainage.
The source of water in pavements is atmospheric precipitation. This water can enter the pavement through several ways (e.g., cracks, infiltration, through shoulders and ditches, high groundwater) and is moved by an energy gradient, such as gravity,and capillary forces.
The free water can be removed by draining vertically through the subgrade or laterally through a drainage layer.
My question is about its role/behaviour as Drainage layer.
Major roles of GSB are given below
1......as a sub base layer to base course...............economic reasons.............
2.....as a seperation layer between fill layers and pavement layers.................
3.....as a drainage layer........when provided continuously through out the width of road........
camber in GSB is towards outside edge of the road......................
advantage is there is no significant change in volume of GSB layer with change in water content.......
YS CHAUHAN
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