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Composite Cinder and Concrete Slab

Composite Cinder and Concrete Slab

Composite Cinder and Concrete Slab

(OP)
I am analyzing a 1922 construction system which consists of (from top to bottom, materials per drawings):
1 inch cement finish
4 inch cinder concrete fill
4 inch concrete slab

There is a note indicating "cinder conc 1+2+5".

I initially assumed the 4" concrete slab is the structural support and the rest is non-structural topping.  However, others think the 4" cinder can be included as a structural element, thus making the analysis for an 8" thick slab.

Who is right?

RE: Composite Cinder and Concrete Slab

The cinder concrete fill is just that...fill.  this type of material has perhaps 500 to 700 psi compressive strength.

See Donald Friedman's book "Historical Building Construction" , chapter 7.  

Relying on the cinder concrete as providing any significant structural contribution is not realistic by current design or evaluation standards.  

      

RE: Composite Cinder and Concrete Slab

I agree with frogit. A while back I had to analyze some floor systems from about the same era with the same type of construction. Another good reference is:

"Structural Analysis of Historic Buildings" by J. Stanley Rabun, published by Wiley.

It's a bit expensive though.

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