Concrete Deck

I'm in the process of building a new home.  A 12'x50' deck will run across  the back of the house.  Rather than use pressure-treated lumber (with all the maintenance it requires), I'd like to use a light weight concrete for  the floor.

Can this be done?

Are there any special requirements for the deck support system if a concrete floor is installed?

How thick should the floor be?  Should it contain any joints? Specifically, what kind of concrete should I use? Can I "score" the surface of the product you're recommending to produce a colored surface?  Though the deck will be covered (second floor roof overhang), it will still be exposed to the elements - can I make the concrete floor non-slip?

Austin, TX, USA
B.,

I am assuming you are talking about a raised deck - not supported by the ground.  Is that correct?
Yes, it will be a raised deck.  It has not yet been built and likely will not be until after the house is closed in (builder is about 2/3 of the way through rough carpentry).
I am afraid it is not very doable.

If you are asking about building a structural slab with lightweight concrete, it does not make sense for this application.  Most ready-mixed concrete plants do not know how to make 3000-4000 psi lightweight concrete, and you will need a structural engineer to design it for you.

If you are asking about a "topping" application where the concrete is placed over a supporting floor and only serves as a "walking surface" - again it does not make sense for a deck.  The lightweight material they usually use for such decks is not strong enough to take the traffic.  Usually they cover those with tiles or carpets.

 If you decide to go with a lightweight topping deck on plywood you will have to provide reinforcement and joints since the flexibility of the wood supports will cause the concrete to crack.

A simpler solution may be to use tiles on the plywood base.  These are rather lightweight, easy to install, come in all shapes and colors and may not be more expensive.