Quote:
Originally Posted by harryc
If mistakes were non-existent, then you wouldn't need the highly paid pros, if They don't make ANY mistakes, then they aren't being pushed hard enough. It is a delicate balancing act.
And then there are always days ......
(345 E Wacker)
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They blew out the forms. The forms weren't put together correctly. The concrete looks fine.
The amount of water in concrete is referred to as the slump. The higher the slump the more water is in the concrete.
source
The slump is determined by using a slump cone. You fill the cone with concrete and then lift the cone in a 5 second (+/- 2 seconds) time period. However far the mud falls is your slump.
They usually want a slump of 6-8 inches to pump it up several stories, so a high slump in this case would be good. It also cuts down on 'honey-combing', or holes in your wall or column that could go as deep as to expose the rebar.
Sometimes the crew gets in a hurry and doesn't tie up the forms correctly or the forms just fail after repeated use.
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