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concrete fill over metal deck

concrete fill over metal deck

concrete fill over metal deck

(OP)
I have a building from the early 60's that has steel joist with metal form deck covered in a light weight concrete used for roof slope with the consistency of masonry grout.  In looking at the available capacity of the joist, the current system seems to be overloading the joist capacity.  I think that the concrete fill is probably not the 110 pcf that I am assuming.  Has anyone had experience with these types of concrete deck fills and if so, what concrete density have you used?

RE: concrete fill over metal deck

(OP)
Thanks for the help.  That material gives a value of about 75 pcf.  I looked at a modern system of an air entrained concrete that gives 50 pcf.  The 75 value is much better than 110.

RE: concrete fill over metal deck

Why not take a sample and weigh it?
Get the volume using a container of known volume of water and measuring the amount displaced by sample.

It's pretty risky to make an assumption.

RE: concrete fill over metal deck

I agree with SEd.  Do the measurements and find out for sure.

BA

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