How best to deal with rubble from tearing-down non-natural building elements?

I'm a newbie and am in the early phases of updating a house that was built with standard (NON-natural-building) materials. I'm trying to strike a balance of updating and replacing some elements with natural materials, BUT without sending too much of what has already been done to a landfill. At minimum though, I'll need tear down a few interior walls that were done with bricks, covered in some kind of plaster, and (most likely petro-based) paint.

So, I'm wondering how I can best reuse the rubble from this demo work. Any recommendations about pros/cons of using it as an aggregate within a lime concrete? Or could any of it be used as infill? In that case, would it be necessary/advisable to remove out the plaster or the bits that were painted? Or is there some method of putting down a protective layer first, to stop any kind of icky leaching? Does this degree of a potential pollutant matter? (We're on sloping land, so infill would be useful to build up some areas, towards creating terraces..) All of this is based on the assumptoin that the other alternative is to send it to a landfill, which seems surely worse.. but, maybe there are also other disposal or reuse options I haven't thought of? I'm in Spain, if that's relevant..

I'm in a similar situation (also in Spain). We have a ruined house that we eventually want to demolish and rebuild, and we have a lot of rubble from redoing our roof (mostly mud, cane and crumbled roof tiles). We are thinking of using the rubble to build "stairs" to go up and down terraces.

Also, recently we thought of converting one of our crumbling water deposits into a natural swimming pool, and we could use a lot of material to fill in.

Another option is to use it to fix access roads, we have a local guy with an excavator and he does wonders with a pile of rocks

In my experience in Spain, especially with old, rural houses (I don't know if it's your case, but it's definitely mine) it's common to find broken pieces of asbestos/uralita, so keep an eye out for that.

Even traditional homes use a lot of items that can be reused.

You mentioned bricks so here are some threads on reusing bricks that you or others might find interesting:

https://permies.com/t/152385/task-avoiding-landfill-reusing-bricks

https://permies.com/t/146045/rocket-ovens/bricks-pizza-oven

I am not quite understanding so of the items that you mentioned.

A lot of homes in the USA have sheetrock so I am including ways to reuse sheetrock:

https://permies.com/t/170294/Recycling-drywall-sheetrock-wallboard-soil

https://permies.com/t/99983/Composting-soil-amending-drywall-scraps

https://permies.com/t/190615/Adding-gypsum-biochar-burn

If there is lumber and nail in your demo these can be reused;

Here, we aren't allowed to send old building material to the landfill,  it has to be taken to a sorting facility to see what can be reclaimed or recycled.  

There's actually a lot of money in reclaiming old building materials,  so it might be worth checking to see if there is something like this in your area.

Depending on the age of the house,  there can be some nasty stuff used in building.  Maybe check the local building traditions to see if anything might leach into the ground.

There isn't much problem with oil-based paints. They become basically inert when they dry.
The problem is with lead containing paint. I would test for that.

Thanks for all the replies! I don't know how I missed them and am so grateful! As we're quite slow moving with the whole of this process, even after so many months, this is actually all still very relevant. (: The idea of using the rubble to improve roads is very interesting. I'm continuing to try to find local reuse and recycling facilities, but it seems it's quite limited, so most likely all of the matter would just be brought to a landfill if we don't find reuse options ourselves. Thanks for the reminder about lead-based paints - good point I'd forgotten. Also about the building materials, Anne, I guess since most of the construction is hollow brick with plaster instead of wood-frame there's isn't sheetrock as such. But, I wonder if some of the info in those threads will also apply for plaster. (I still have some gaps here in my understanding of materials, I think.) Consulting with local permie-oriented eco-builders, I got some pointers and opinions about how best to sort if we want to use some of the material as in-fill on our property. (Which was generally encouraged - as it is "essentially the same as what would happen at a local landfill".) The main point they made was that plaster, including 'natural' lime or chalk plaster, should be separated out and not added to the soil. And a big yes to your warning about asbestos, Mauro - we're very much on the alert as there's plenty of such nasty stuff that was incorporated when the old house was "updated" in the 70s. Still figuring out the processs to avail ourselves of the govt assistance to getting that removed properly and safely. And thanks for the detail on roofing material specifically - that's on the horizon for us, and I imagine the materials will be quite similar to what you describe.

When we lived in the big city there were businesses that sold used building materials.

I really like to explore those kinds of businesses for unusual items. Unique windows and doors mostly those all kinds of unusual items can be had.

I remember my Dad talking about when he was a teenager his Dad paid him to take nail out of wood while they were tearing down a house to build a new house.

I hate those TV shows where house flippers tear out really nice looking kitchen cabinets and send them to the landfill. What a waste,

Agreed! I wish there were more of such places around here, but I am gradually getting connected with the local resources working in that direction. Ditto the frustration with how much gets sent to landfill as standard procedure. (And - love your Stephen Herrod Buhner quotes!)