Has Anyone Ever Seen Concrete Disintegrate Like This? - Masonry Picture Post - Contractor Talk

Has Anyone Ever Seen Concrete Disintegrate Like This?

 
Thread Tools Search this Thread Display Modes
Old 07-01-2017, 10:53 AM   #1
Registered User
 
Shaffer's Avatar
 
Trade: GC
Join Date: Jul 2017
Posts: 5
Rewards Points: 10

Has Anyone Ever Seen Concrete Disintegrate Like This?


The mudslab in this picture had the following characteristics:
-3 inch mudslab
-no reinforcement
-Poured in West Michigan in the summer time.
-Placed on subgrade that had passed a test from an independent agency. It was reported, however, that the subgrade was somehwat dry.
-Allowed to cure for about six days.
-Forklifts were driving on it during steel erection.
-80% cement mix

Here is the tricky part. I know a myriad of the reasons I listed could have contributed to issues. The mudslab was supposed to crack, we just wanted it as a base for the actual slab. However, nothing listed would be a legitimate reason for it to totally disintegrate the way it did. I know running forklifts with steel will crack it and I know a dry subgrade will pull the moisture from the mudslab, but we have done this exact same pour tons of times with great results. Does anyone know what this could be?
Attached Thumbnails
Has anyone ever seen concrete disintegrate like this?-img_1457.png  
Shaffer is offline  

Warning: The topics covered on this site include activities in which there exists the potential for serious injury or death. ContractorTalk.com DOES NOT guarantee the accuracy or completeness of any information contained on this site. Always use proper safety precaution and reference reliable outside sources before attempting any construction or remodeling task!

   

Advertisement

 

Old 07-01-2017, 11:22 AM   #2
Pro
 
fjn's Avatar
 
Trade: mason
Join Date: Aug 2011
Posts: 5,170
Rewards Points: 11,202

Re: Has Anyone Ever Seen Concrete Disintegrate Like This?


Without having witnessed the placement of the concrete,it would be conjecture on my end to throw out a cause,many variables . What was the slump,was water added on site,was bleed water present,was it floated or troweled into slab,why was the sub base not dampened,how was it cured,compound,periodic wetting and drying etc.etc.?

Advertisement

fjn is offline  
Old 07-01-2017, 11:42 AM   #3
Registered User
 
Shaffer's Avatar
 
Trade: GC
Join Date: Jul 2017
Posts: 5
Rewards Points: 10

Re: Has Anyone Ever Seen Concrete Disintegrate Like This?


It was watered on site. I was not on site either but it seems that the slump was not enough originally and they poured too much water, sending it upward of 6". This was also corrected very quickly from the report. I believed it was actually laser screeded. The big thing about this is it wasn't meant to be a big deal. It was just supposed to be a base instead of pouring the slab on top of the subgrade. We expected deformaties and cracks, but I can't figure out what would cause such disintegration. I was literally picking up chunks and pulling out the river rock (aggregate) as if there wasn't any adhesion whatsoever. I don't think there was a cure.
Shaffer is offline  
Sponsored Links
Advertisement
 
Old 07-01-2017, 12:43 PM   #4
Fire up the BBQ
 
griz's Avatar
 
Trade: GC
Join Date: Nov 2009
Location: ex-calif
Posts: 22,825
Rewards Points: 1,112

Re: Has Anyone Ever Seen Concrete Disintegrate Like This?


Could also be a bad mix. Not enough cement.

Also too much water and dried out too quick.
__________________
SOME JOBS JUST AREN'T WORTH DOING:
griz is online now  
The Following User Says Thank You to griz For This Useful Post:
Calidecks (07-01-2017)
Old 07-01-2017, 01:06 PM   #5
Pro
 
Tscarborough's Avatar
 
Trade: Monkey Scratching Cat Herder
Join Date: Feb 2006
Location: Austin
Posts: 6,346
Rewards Points: 1,460

Re: Has Anyone Ever Seen Concrete Disintegrate Like This?


There really are no conditions under which properly batched and dispatched concrete will disintegrate like that. Tear it out and try again.
Tscarborough is offline  
The Following 3 Users Say Thank You to Tscarborough For This Useful Post:
Calidecks (07-01-2017), Joasis (07-02-2017), parkers5150 (07-05-2017)
Old 07-01-2017, 10:21 PM   #6
Box Builder
 
Morning Wood's Avatar
 
Trade: Pretty much anything with wood and some metals
Join Date: Jan 2008
Location: Rockport, MA
Posts: 6,273
Rewards Points: 10,354

Re: Has Anyone Ever Seen Concrete Disintegrate Like This?


I'll see less concrete in my life than some of you guys will see in a period of 5 years I'm sure. But that looks like a bad mix. Ive never seen anything like that.
Morning Wood is offline  
Old 07-01-2017, 10:42 PM   #7
GC/carpenter
 
Calidecks's Avatar
 
Trade: Decking, Railing, Carpenter/General Contractor
Join Date: Nov 2011
Location: Anaheim Hills, California (OC)
Posts: 39,295
Rewards Points: 6,630

Re: Has Anyone Ever Seen Concrete Disintegrate Like This?


Maybe finished too early without allowing proper bleeding? Where the water is suppose to come to the surface. If it's finished too early it can trap water.


Mike.
_________
Calidecks is online now  
Old 07-02-2017, 10:50 AM   #8
Pro
 
fjn's Avatar
 
Trade: mason
Join Date: Aug 2011
Posts: 5,170
Rewards Points: 11,202

Re: Has Anyone Ever Seen Concrete Disintegrate Like This?


Not too be a wise guy after the fact but this is exactly the reason it is always a good idea to fill a test cylinder of every batch delivered. You don't have to send them off for testing unless you encounter a problem such as this.
fjn is offline  
The Following User Says Thank You to fjn For This Useful Post:
kirkdc (07-02-2017)
Old 07-02-2017, 11:11 AM   #9
Pro
 
Joasis's Avatar
 
Trade: General Contractor
Join Date: Mar 2006
Location: Hennessey, Oklahoma
Posts: 9,667
Rewards Points: 1,444

Re: Has Anyone Ever Seen Concrete Disintegrate Like This?


Either cheated on cement, or...poured with a lot of water.

Advertisement

__________________
Ladwig Construction
Hennessey, Oklahoma
405 853 1563

Insulated Concrete Homes / ICF's
My Facebook Page
Joasis is offline  


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

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
If you're not on Facebook, you should be. Sir Mixalot Marketing & Sales 1862 02-15-2020 02:59 PM
Help Thinking outside the box here... CONCRETE HELL!! JeremyBCalnan Tools & Equipment 37 06-24-2014 10:33 PM
Concrete Floor, no vapor barrier ericomerico Specialty Coatings 6 06-17-2014 08:27 AM
need help on bidding for concrete jobs! Bconcretegirl Marketing & Sales 15 12-04-2013 12:25 PM
Concrete footing removal 18withtools Demolition 19 01-29-2013 07:34 PM

Join Now... It's Fast and FREE!

I am a professional contractor
I am a DIY Homeowner
Drywall Talk is for
PROFESSIONAL CONTRACTORS ONLY!

At DrywallTalk.com we cater exlusivly to professional contractors who make their living as a contractor. Knowing that many homeowners and DIYers are looking for a community to call home, we've created www.DIYChatroom.com DIY Chatroom is full of helpful advices and perfect for DIY homeowners.

Redirecing in 10 seconds
No Thanks
terms of service

Already Have an Account?