Dear Waiseng Tang,

Foamed  Concrete - Another Name is Cellular Concrete , The Density of this concrete Ranging from  480 kg/m3  To  640 kg/m3 .

In Roof First Have to Fix Bottom Skin of Corrugated Powder Coated Steel Sheet then Lay the foam Concrete ( Foam + Cement + water ) as Required thickness,

Then we can go for Waterproofing above Foam Concrete ( or ) Top Skin of Corrugated Powder Coated Steel Sheet.

Another One, the Same as above Bottom skin and top skin Corrugated Powder coated Steel Sheet , Instead of  Foam concrete we can go for Sandwich Layer also.      

Reference :

https://Books.Google.co.in

Significance of Tests and properties of Concrete and Concrete - Making Materials

STP 169C

ASTM ( PCN )

I believe you are referring to corrugated steel formed concrete.  See below

http://www.ccaa.com.au/imis_prod/documents/Library%20Documents/CCAA%20Technical%20Publications/CCAA%20Guides/CCAAGUIDE2003-T36-Long-span%20floors-TBR.pdf

https://www.concreteinstitute.com.au/fib-Australian-National-Member-Group/Publications.aspx

I have a paper on this topic.  Please see the following paper.  I hope this would help.

Article Concrete bridge deck stresses induced by stay-in-place forms