DIYnot
Local | Network
   DIYnot > Forums
Local | Network
DIYnot Network Local DIYnot Network Local  
  Forum IndexForum Index     RulesRules    HelpHelp     Join FREERegister Free     About CookiesCookies     SearchSearch     LoginLogin 

Precast and PreStressed Concrete Lintels


 
Post new topic   Reply to topic    DIYnot.com Forum Index > Building
Search this topic :: View previous topic :: View next topic  
Author Message
self builder 123

from United Kingdom

Joined: 11 Apr 2007
Posts: 427
Location: Aberdeen,
United Kingdom

PostPosted: Mon Sep 29, 2008 7:52 pm Reply with quote

Hi

Whats the difference between a precast and a prestressed concrete lintel ?
Back to top
 Alert Moderators

If you do not want to see this advert, click here to login or if you are new click here to join free.
^woody^

from United Kingdom

Joined: 03 Sep 2006
Posts: 12977
Location: Birmingham,
United Kingdom
Thanked: 1255 times

PostPosted: Mon Sep 29, 2008 8:14 pm Reply with quote

Pre-cast is a generic term - basically its made in a mould and then lifted into place - as opposed to cast in-situ

Pre-stressing is where the reinforcement is pulled tight and the lintel has a slight chamber (or arch shape) and this will take more load than a 'normal' flat lintel

Many people mix up the two terms and actually just mean a concrete lintel
Back to top
 Alert Moderators
Shytalkz

from United Kingdom

Joined: 22 Feb 2008
Posts: 4865
Location: Norfolk,
United Kingdom
Thanked: 13 times

PostPosted: Mon Sep 29, 2008 8:18 pm Reply with quote

Precast is a concrete lintel formed with "normal" high yield or mild rebar that is placed and the concrete then cast.

Prestressed is a concrete lintel with smaller rebar comprising thin high yield steel tendons which are put into tension ie pulled apart as the concrete is cast. These are cut when the concrete has cured, which puts the concrete into compression as the wires try to shorten themselves. The reason for this is that concrete is strong in compression, weak in tension: it therefore reduces the tensile stresses in the concrete when a load is applied ie it's much stronger.
Back to top
 Alert Moderators
Shytalkz

from United Kingdom

Joined: 22 Feb 2008
Posts: 4865
Location: Norfolk,
United Kingdom
Thanked: 13 times

PostPosted: Mon Sep 29, 2008 8:19 pm Reply with quote

Oh the Woodster and I posted at much the same time... icon_lol.gif

That was one structures lesson you went to then, eh, Woodsie?!
Back to top
 Alert Moderators
noseall

from United Kingdom

Joined: 02 Feb 2006
Posts: 19961
Location: Staffordshire,
United Kingdom
Thanked: 1193 times

PostPosted: Mon Sep 29, 2008 8:42 pm Reply with quote

there are also two types of builder....

.....pre-cash and pretty stressed!
Back to top
 Alert Moderators
^woody^

from United Kingdom

Joined: 03 Sep 2006
Posts: 12977
Location: Birmingham,
United Kingdom
Thanked: 1255 times

PostPosted: Mon Sep 29, 2008 9:24 pm Reply with quote

LOL you can see who charges by the hour/word.

Actually that is basic C&G brickwork stuff icon_razz.gif ... who needs structural lessons, pah! icon_rolleyes.gif

BTW, I don't think you would want pre-stressed lintels on your house - it messes up the coursing and there should not really be much need for them in terms of load
Back to top
 Alert Moderators
Search this topic :: View previous topic :: View next topic  
Post new topic   Reply to topic    DIYnot.com Forum Index > Building All times are GMT
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
Similar Topics   Replies   Views   Posted 
Precast concrete garages 9 680 Fri Jun 19, 2009 12:06 pm
precast garage build 2 60 Fri Feb 24, 2012 8:22 am
What supports outer wall with concrete lintels? 7 1560 Mon Jul 05, 2004 10:07 am
Cracked Concrete Lintels 3 200 Tue Nov 02, 2010 1:28 pm
RSJ and concrete lintels 3 720 Sun Aug 19, 2007 8:24 pm


 
DIYnot
Find an Expert | Find a Supplier | Search DIYnot.com
Network | Advertising | Newsletter
DIY | DIY How To | @home | DIY Wiki | DIY Forum
By using this site you agree to our Terms of Service / Disclaimer.
Please read our Privacy Policy. Copyright © 2000-2014 DIYnot Limited.