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jvg0007
Participant

Join Date: Mar 2009
Posts: 1

BC PAVING very urgent

04/26/2009 5:55 AM

i'm working as apaving engr. i wanna to know can we lay bc layer on EXISTING CARRIAGEWAY without scarification .can we get the undisturbed surface coarse ie without slippage,good bondage between layers. here we r told by contractors to lay bc layer without scarification on ecw bc layer. plzz its very urgent. expecting all ur views
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babybear
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United Kingdom - Member - Not a new member!

Join Date: Jun 2008
Location: USA/Europe
Posts: 4547
Good Answers: 68
#1

Re: BC PAVING very urgent

04/27/2009 2:48 AM

Hello http://cr4.globalspec.com/member?u=24675, If you are talking of a 'binding course' on tarmac? I have seen this done only on 'local' estate roads, not on highways. It is usually a sprayed layer of hot tar and grit spread on top. No rolling. Hope this helps Take Care

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 Take it easy, bb. >"HEAR & you FORGET<>SEE & you REMEMBER<>DO & you UNDERSTAND"<=$=|O|=$=>"Common Sense is Genius dressed in its Working Clothes"<>[Ralph Waldo Emerson]
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babybear
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Join Date: Jun 2008
Location: USA/Europe
Posts: 4547
Good Answers: 68
#2

Re: BC PAVING very urgent

04/27/2009 3:08 AM

Hi, http://www.leics.gov.uk/index/highways/road_pathway_maintenance/htd/highway_req_development_part4.htm#section_mc10_surface_and_binder Check out the detail on this link. It refers to an English local road. Take care, and hope it is useful !

__________________
 Take it easy, bb. >"HEAR & you FORGET<>SEE & you REMEMBER<>DO & you UNDERSTAND"<=$=|O|=$=>"Common Sense is Genius dressed in its Working Clothes"<>[Ralph Waldo Emerson]
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Fierce Allegiance
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Join Date: Feb 2008
Location: Connecticut shoreline
Posts: 67
Good Answers: 5
#3

Re: BC PAVING very urgent

04/30/2009 9:30 AM

For top courses over existing bituminous concrete pavement, we (Connecticut, USA)apply a material called "tack coat" {A tack coat is a thin bituminous liquid asphalt, emulsion or cutback layer applied between HMA pavement lifts to promote bonding. }which aids the adhesion between the old and new material. It is also applied when the existing pavement is cold planed (also called milling or scarification). Application rates are approximately 0.2 liters per square meter.

Consult a professional with more local knowledge of approved methods.
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