Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Concrete, Stone & Masonry

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 11-10-2013, 09:21 AM   #1
Member
 
Join Date: Oct 2006
Location: georgia
Posts: 292
Rewards Points: 250
Default

how long to cure before using wedge anchors


I poured a footing yesterday with quikrete and want to install post brackets with wedge anchors, how long should I wait?


Last edited by ugabulldog; 11-10-2013 at 05:46 PM.
ugabulldog is offline   Reply With Quote
Old 11-10-2013, 09:32 AM   #2
Member
 
Join Date: Jun 2009
Location: atl & hilton head
Posts: 3,404
Rewards Points: 2,390
Default

how long to cure before using wedge anchors


how thick's the footing & how close to the edge for anchors ?

stadry is offline   Reply With Quote
Old 11-10-2013, 09:33 AM   #3
Member
 
Join Date: Oct 2006
Location: georgia
Posts: 292
Rewards Points: 250
Default

how long to cure before using wedge anchors


Quote:
Originally Posted by itsreallyconc View Post
how thick's the footing & how close to the edge do you want do drill for the anchors ?
8" footing, wedge anchor is only 4", at least 6" from edge.
ugabulldog is offline   Reply With Quote
Old 11-11-2013, 05:34 AM   #4
Member
 
Join Date: Jun 2009
Location: atl & hilton head
Posts: 3,404
Rewards Points: 2,390
Default

how long to cure before using wedge anchors


curious why no j bolts in wet conc ? quikcrete suggests a diy project - what's your goal ? ?
stadry is offline   Reply With Quote
Old 11-16-2013, 10:18 PM   #5
DIY Hack
 
Mr Chips's Avatar
 
Join Date: Mar 2008
Location: Location, Location
Posts: 1,302
Rewards Points: 500
Default

how long to cure before using wedge anchors


You really shouldn't drill or install wedge anchors in concrete less than 28 days old
__________________
Those who can, do...
Those who can't criticize on the internet
Mr Chips is offline   Reply With Quote
Old 11-17-2013, 08:38 PM   #6
Member
 
Join Date: Mar 2006
Location: Austin, TX
Posts: 1,271
Rewards Points: 564
Default

how long to cure before using wedge anchors


That is not correct, Mr. chips, I have installed many anchors the next day. What matters is the distance from the edge, not the age of the concrete. Under your circumstance, I would drill them asap and set the anchors, but not tighten them for a couple of days if possible.
__________________
Advice is free, Lessons begin at 75 bucks an hour.
Tscarborough is offline   Reply With Quote
Old 11-17-2013, 09:51 PM   #7
DIY Hack
 
Mr Chips's Avatar
 
Join Date: Mar 2008
Location: Location, Location
Posts: 1,302
Rewards Points: 500
Default

how long to cure before using wedge anchors


Because you can doesn't mean you should. I have never seen any wedge anchor manufacturer publish any load values for wedge anchor in green concrete. How much an anchor will hold is based on the several factors, one being the compressive strength of the base material. Uncured concrete has unknown compressive strength. Under your scenario the wedge anchors are unset and you might as well drill holes and just drop bolts into the holes
__________________
Those who can, do...
Those who can't criticize on the internet
Mr Chips is offline   Reply With Quote
Old 11-17-2013, 10:12 PM   #8
Member
 
Join Date: Mar 2006
Location: Austin, TX
Posts: 1,271
Rewards Points: 564
Default

how long to cure before using wedge anchors


The cure (and hence the strength, of which we care about the tensile, not the compressive in this instance) of concrete is not a linear function. Concrete will reach 50% of it's final strength within a day or 2, 75% within a week, and not reach it's complete strength in our lifetime.

The OP is setting posts, not securing girders supporting a highway bridge, and it goes with the workflow to set said posts and anchors as soon as is practical. If the OP drills the holes and sets the post brackets, he can proceed with his project and tighten them the next day or two with no issues.
__________________
Advice is free, Lessons begin at 75 bucks an hour.
Tscarborough is offline   Reply With Quote
Old 11-18-2013, 06:36 PM   #9
43 years in construction
 
Arkitexas's Avatar
 
Join Date: Mar 2011
Location: Texas
Posts: 104
Rewards Points: 75
Default

how long to cure before using wedge anchors


Standard concrete reaches 50% design strength in approximately three days, 75% in about 7 days, 90% in about 14 days, and 100% in about 28 days. Concrete technically never ceases getting harder but after 28 days the increments become so small as to not be useful. The above percentages vary depending on the temperature, curing conditions, and mix additives.

If you install wedge anchors the day after you cast the concrete, it is at only 25% to 30% of its 28 day strength and you run the risk of obvious fracturing or something even more subtle. Wedge anchor design relies on the concrete in the anchor hole to NOT move but rather "push back" (resist) the anchor's sideway pressure. This pressure is what holds the anchor in place. The greater the pressure between the concrete and the anchor the stronger the anchorage (until the anchor pressure exceeds the shear strength of the concrete). As some suggest here, green concrete (that which has not fully cured) may in fact not fracture under load from a wedge anchor but green concrete is still somewhat pliable and it will move under pressure from the anchor by essentially enlarging the anchor hole. This results in reduced pressure at the anchor, and ultimately weakens the connection. In building construction we never permit structural wedge anchors to be set or cast-in-place anchors to be loaded before the concrete has set for 28 days. If you are in a rush, wait at least a week when the concrete is at 75% strength. If your anchor is not carrying any appreciable load it may be ok. If you want it to be strong.. wait.

Arkitexas is offline   Reply With Quote
The Following User Says Thank You to Arkitexas For This Useful Post:
Mr Chips (11-19-2013)
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
how long is too long for more floor poly? LidoGirl Painting 12 09-09-2012 08:36 AM
How long to wait for concrete to cure? toddmanqa Building & Construction 6 07-29-2012 11:23 AM
How long to let concrete cure in sono tubes? MikeVila Concrete, Stone & Masonry 2 04-22-2012 10:05 PM
Hanging Shutters in brick - anchors? Mr.Tryng2fxit Remodeling 7 03-31-2012 12:01 AM
How long should A/C take to cool house? AllGoNoShow HVAC 2 06-17-2007 08:01 PM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.