Light weight streinth
Light weight streinth
(OP)
We usually let concrete floors we produce sit for 21 days. (until the 21 day break test comes in ) We want to start construction on the floors 7 days after the pour is there any codes that permit this. I have heard that if the 7 day test is returned at 75% then there shouldn't be a problem, We are using light weight with a 3000 PSI





RE: Light weight streinth
You should look at the anticipated temporary construction loads on the concrete and perhaps analyze the framing with a reduced f'c to see what level you need.
Usually, f'c doesn't affect flexure all that much, but shear and compression are more sensitive.
We usually require 75% of f'c as a minimum. Have the contractor make additional cylinders (if its not too late) so you can test at 5, 7, etc. days.
RE: Light weight streinth
RE: Light weight streinth