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Joined: Jun 2007
Posts: 29,814 Likes: 7
Campfire Ranger
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Campfire Ranger
Joined: Jun 2007
Posts: 29,814 Likes: 7 |
No idea as to initial cause, I am pleased I don't have to pay for it.
These are my opinions, feel free to disagree.
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Joined: Jan 2010
Posts: 2,761
Campfire Regular
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Campfire Regular
Joined: Jan 2010
Posts: 2,761 |
Welcome to TN - patron state of shootin’ stuff
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Joined: Apr 2017
Posts: 1,376
Campfire Regular
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Campfire Regular
Joined: Apr 2017
Posts: 1,376 |
Um, weight is the result of gravity. In simple terms: Weight = mass x gravity
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Joined: Mar 2003
Posts: 2,619 Likes: 1
Campfire Regular
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Campfire Regular
Joined: Mar 2003
Posts: 2,619 Likes: 1 |
NRA-Benefactor
TSRA-Life
"It's a terrible thing when governments send their young men to kill each other." Charles Byrne,WW2 Vet.
On the day Desert Storm began.
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Joined: Feb 2013
Posts: 22,176 Likes: 22
Campfire Ranger
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OP
Campfire Ranger
Joined: Feb 2013
Posts: 22,176 Likes: 22 |
Good read also... FLW and the Johnson Wax Project... Proof Testing his "Lily pads" https://www.cnet.com/pictures/why-frank-lloyd-wright-piled-60-tons-on-a-lily-pad-pictures/I do lots of Proof Testing in my world.
If you are not actively engaging EVERY enemy you encounter... you are allowing another to fight for you... and that is cowardice... plain and simple.
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Joined: Dec 2005
Posts: 13,116 Likes: 13
Campfire Outfitter
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Campfire Outfitter
Joined: Dec 2005
Posts: 13,116 Likes: 13 |
What caused the failure?
A: It cracked and fell apart.
"...aspire to live quietly, and to mind your own affairs, and to work with your hands, as we instructed you, so that you may walk properly before outsiders and be dependent on no one." - Paul to the church in Thessalonica.
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Joined: Oct 2002
Posts: 10,015 Likes: 4
Campfire Outfitter
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Campfire Outfitter
Joined: Oct 2002
Posts: 10,015 Likes: 4 |
Your opinion matters... ![[Linked Image from i.postimg.cc]](https://i.postimg.cc/9XPj3jLP/425697397-686874766944054-1830459456452783105-n.jpg) Assuming it was designed with 4,200 PSI concrete... Assuming it is 3' x 4'... It has a cross section of 1,780 Sq. Inches If each bears 4,200 or higher. That is 7.3 million pounds of loading capacity. FYI... NOTHING weighs 7.3 million pounds. Not even John Burn's lard ass Stacey Abrams?
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Joined: Feb 2004
Posts: 46,755
Campfire 'Bwana
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Campfire 'Bwana
Joined: Feb 2004
Posts: 46,755 |
A few things. One is load and a lot of it. 2 from that shot the rebar looks too close to the forms. Typically 2" clearance is needed for a minimum. 3) it doesn't look like it was properly vibrated and dropped into the column from too high of a distance instead of using a tremme shoot or a pump hose to shorten the fall
Camp is where you make it.
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Joined: Feb 2004
Posts: 46,755
Campfire 'Bwana
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Campfire 'Bwana
Joined: Feb 2004
Posts: 46,755 |
Paid off building inspector. I wouldn't say "paid off" but there is plenty of BS with inspectors. Most of them don't want to rock the boat and/or are so busy they spend about 10 minutes on a site where they should be for hours.
Camp is where you make it.
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Joined: Dec 2019
Posts: 17,640 Likes: 49
Campfire Ranger
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Campfire Ranger
Joined: Dec 2019
Posts: 17,640 Likes: 49 |
Don't know crap.
I don't like how close to the surface the rebar is. Agreed. A cold pour should really have steel crossing the pour surface towards the center as well.
-OMotS
"If memory serves fails me..."
Quote: ( unnamed) "been prtty deep in the cooler todaay "
Television and radio are most effective when people question little and think even less.
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Joined: Feb 2004
Posts: 46,755
Campfire 'Bwana
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Campfire 'Bwana
Joined: Feb 2004
Posts: 46,755 |
Your opinion matters... I am still opining about the type of tie wire used, also, now I look at it, I dont see any cross bars (steel) going from one side, hooking onto the other side. Looks to be #8 at 10" to me (I could be wrong). It does have proper stirrups. The rebar is appropriate (most jobs overkill the rebar in a hugely wasteful manner... this rebar is fine). The real tell-tail is how clean the rebar is after failure... i.e. the concrete just popped off leaving clean rebar. The problem is that the water:cement ratio is totally fubar. Someone souped up a hot load with WAY WAY too much field water and made diarrhea. There's nothing wrong with that rebar size. It's pretty big actually.
Camp is where you make it.
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Joined: Dec 2019
Posts: 17,640 Likes: 49
Campfire Ranger
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Campfire Ranger
Joined: Dec 2019
Posts: 17,640 Likes: 49 |
Something heavy atop Probly added to the bulge effect The muffin top effect?
-OMotS
"If memory serves fails me..."
Quote: ( unnamed) "been prtty deep in the cooler todaay "
Television and radio are most effective when people question little and think even less.
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Joined: Sep 2009
Posts: 11,345 Likes: 11
Campfire Outfitter
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Campfire Outfitter
Joined: Sep 2009
Posts: 11,345 Likes: 11 |
Before anything else is considered, this picture screams of lack of bond.
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Joined: Dec 2019
Posts: 17,640 Likes: 49
Campfire Ranger
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Campfire Ranger
Joined: Dec 2019
Posts: 17,640 Likes: 49 |
I was told many years ago from an Engineer that the Concrete in structures is calculated as negative strength.
All of the strength comes from the reinforcing steel and the concrete just keeps the reinforcing steel in place. This may be true for tensile strength, but it's not true for compressive strength. Concrete has excellent compressive strength but it lacks tensile strength. That's why pre-cast horizontal beams have all the re-bar at the bottom of the beam. When a horizontal beam flexes under a load, the top of the beam is under compression and the bottom is under tension and that's where the steel is needed. Axis of orientation bears on this. We were doing a concrete building in California for the horizontal structural beams the rebar was tensioned before the pour. After the concrete had set the rebar was cut off leaving the concrete under compression. Of course this doesn't apply to the OPs photo.
-OMotS
"If memory serves fails me..."
Quote: ( unnamed) "been prtty deep in the cooler todaay "
Television and radio are most effective when people question little and think even less.
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Joined: Oct 2011
Posts: 41
Campfire Greenhorn
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Campfire Greenhorn
Joined: Oct 2011
Posts: 41 |
My initial thoughts, a seismic event. If that is the case the damage ain't that bad
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Joined: Dec 2019
Posts: 1,540 Likes: 18
Campfire Regular
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Campfire Regular
Joined: Dec 2019
Posts: 1,540 Likes: 18 |
Driving through Montreal a few years ago we noticed every high structure was crumbling. There is mineral substance in some gravels that becomes gelatinous when used in concrete. It is well known since WWII but still is overlooked. A huge stretch of our interstate had to be ripped up soon after poured. Some idiot didn't check.
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Joined: Oct 2016
Posts: 1,816 Likes: 3
Campfire Regular
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Campfire Regular
Joined: Oct 2016
Posts: 1,816 Likes: 3 |
.
Looks like a bad mix in that truck.
Maybe consolidation was not up to snuff as well.
I don't know what their inspection/sampling methods are, but they will be looking at those field and lab reports.
We test every 50 yards on a big pour so a truck with a bad mix or the wrong mix design (if no one checked) could slip through.
B L M - Bureau of Land Management
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Joined: Jul 2010
Posts: 8,580 Likes: 7
Campfire Outfitter
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Campfire Outfitter
Joined: Jul 2010
Posts: 8,580 Likes: 7 |
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Joined: Jul 2005
Posts: 6,830
Campfire Tracker
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Campfire Tracker
Joined: Jul 2005
Posts: 6,830 |
Your opinion matters... Reminds me of the current state of the Union.
Old Corps
Semper Fi
FJB
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Joined: Feb 2010
Posts: 16,189 Likes: 5
Campfire Ranger
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Campfire Ranger
Joined: Feb 2010
Posts: 16,189 Likes: 5 |
Driving through Montreal a few years ago we noticed every high structure was crumbling. There is mineral substance in some gravels that becomes gelatinous when used in concrete. It is well known since WWII but still is overlooked. A huge stretch of our interstate had to be ripped up soon after poured. Some idiot didn't check. First I’ve heard of this. What is the substance?
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