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Asked by : Vivek Singh, Project Manager, L&T
Industry : Construction
Activity: Question posted: 06 28 2008 01:55:07 +0000, 12 answers, 26315 views, last activity 08 06 2014 11:19:19 +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)?

 

 
  Answered by     Narendra Gogula, Project Engineer, IIT Madras  | 08 06 2014 11:20:55 +0000
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what is density of GSB??

  Answered by     Bhartiya Khojkarta, Freelancer, khoj  | 09 17 2013 12:28:21 +0000
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difference between grider & joist

  Answer modified by     Bhartiya Khojkarta, Freelancer, khoj  | 09 17 2013 12:25:35 +0000
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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.

                                     Bhartiya khojkarta

                                                                  please give comment on my research

  Answered by     Sirish Rooney, student , Hogwarts School of Witchcraft and Wizardry  | 09 12 2013 19:37:29 +0000
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about the base layer can anyone give me information about the base layer?

  • function
  • materials made out of
  • types 
  • advantages 
  • disadvantages

i need this information for my project. REPLAY ASAP.

thank you.

  Answered by     Vijay Kanakdande, DGM, L & T  | 08 03 2011 09:29:30 +0000
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Role of GSB is like a shock absorver 

 

  Answer modified by     naveenkumar Chilakwad, QC INSPECTOR, SGS INDIA PVT. LTD  | 12 27 2010 08:56:58 +0000
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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

  Answered by     suraj singh, Deputy Project Manager  | 09 02 2008 01:07:13 +0000
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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. 

 

  Answered by     Yogendra Singh Chauhan, Civil Engineer-Highway Roadway, AECOM  | 07 04 2008 23:47:39 +0000
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filter layer will minimise the damages...............

  Answered by     Vivek Singh, Project Manager, L&T  | 07 02 2008 20:36:05 +0000
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But will the water reach the drainage layer without affecting the pavement, as detailed in the question?

  Answered by     Yogendra Singh Chauhan, Civil Engineer-Highway Roadway, AECOM  | 07 02 2008 09:25:24 +0000
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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. 

 
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