When Safe to Move Ballast Box with Fresh Concrete

[ovrszd]

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.

 

[Streetcar]

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

 

[ovrszd]

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.

 

[chim]

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.

 

[oosik]

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

 

[fried1765]

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?

 

[oosik]

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.

 

[orezok]

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.

 

[fried1765]

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 !!!

 

[chim]

............Also..... what brand/model vibrator?

Not sure on the particulars, but I'd guess it was delivered in a plain brown package