Subject: How decomposed is a human body buried in concrete for 40 years?

I am writing a novel where a character discovers a body buried in concrete for 
the last 40 years.  I wondered if there would be just bones left or if the 
body would still be intact and mummified (this takes place in the middle of 
the desert)or if there would be a shell of the person like the victims of Mt 
Vesuvius.  I'd appreciate any input you can give.  Thanks so much.

Re: How decomposed is a human body buried in concrete for 40 years?