When Safe to Move Ballast Box with Fresh Concrete

   / When Safe to Move Ballast Box with Fresh Concrete #11  
I don’t disagree, so long as he doesn’t use it for a rear mounted battering ram. I was hedging a bit so the 28 day gang didn’t crucify me.

They can be heartless. ;)
 
   / When Safe to Move Ballast Box with Fresh Concrete #12  
My 28 day was based on using concrete structurally and most people that use bag mix use too much water. For weight in a box you are good the next day
 
   / When Safe to Move Ballast Box with Fresh Concrete #13  
My 28 day was based on using concrete structurally and most people that use bag mix use too much water. For weight in a box you are good the next day

At a glance your answer was technically correct. Upon further inspection it becomes apparent the concrete mix is contained and simply weight. :)
 
   / When Safe to Move Ballast Box with Fresh Concrete #14  
For our pours at work we have test cylinders broken at 7 and 28 days. Nearly all cylinders have compressive strength at greater than design mix for the 7 day break.
 
   / When Safe to Move Ballast Box with Fresh Concrete #15  
My blob of concrete stayed in the form for a bit over two weeks. Estimated weight - 480 pounds. There is a short lifting chain - center, top of the blob.

View attachment 577590
 
   / When Safe to Move Ballast Box with Fresh Concrete #16  
My blob of concrete stayed in the form for a bit over two weeks. Estimated weight - 480 pounds. There is a short lifting chain - center, top of the blob.

View attachment 577590

What type of form did you use for that Oosik? Wood or steel?
Also..... what brand/model vibrator?
 
   / When Safe to Move Ballast Box with Fresh Concrete #17  
Fried - the form was plywood with 2x4 edges to hold it all together. Vibrator - you gotta be kidding. This was strictly a slop and drop job. As you can see - over the years the edges have suffered somewhat. But it still works.
 
   / When Safe to Move Ballast Box with Fresh Concrete #18  
Having built a half a billion dollars worth of public schools where we were required to probably test 10,000 cylinders, approximately 9 out of 10 reach 100% of design strength at 7 days. Twentyeight day strength usually hit 135 to 175% of design strength.

Of course, this was not Quikcrete.
 
   / When Safe to Move Ballast Box with Fresh Concrete #19  
Fried - the form was plywood with 2x4 edges to hold it all together. Vibrator - you gotta be kidding. This was strictly a slop and drop job. As you can see - over the years the edges have suffered somewhat. But it still works.

I WAS kidding !!!
 

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