Yes they are designed that way. If you like you can pour without using chair but you have to make absolutely sure that the reo lays at the correct level in the concrete.
The amount of rebar depends on the thickness of what you are making. All three dimensions.
Concrete it self may not but most concrete structures .Has rebar in them and that can .
Depends on stress and loading. adding it is a safe bet
For the same reason rebar is added to cement: structural integrity.
As much as the engineered load calls for to perform the task the cement is required to perform.
Rebar locators are used to find exactly where the reinforcing steel is located under concrete in existing materials. They are most often used for renovation or remodeling projects.
IF I WAS YOU I WOULD DO A PRESSURE TEST TO BE 100% SURE.
Rebar Detailing is a procedure of making shop drawings for the steel reinforcement for the development procedure. The Rebar Detailing procedure incorporates the position, bending shapes, amount, description, laps of the reinforcing steel and measurements. The Rebar Detailing Drawings are made to incorporate the separating, area, rebar size and lap of steel. The Rebar Detailing Services includes: Rebar Detailing Services, Rebar Shop Drawings Services, Rebar fabrication Services, Rebar Framing Plan Design, Rebar Structure Foundation, Rebar Pit Design, Rebar Framing Plan, Rebar Beam Design, Rebar Structure Steel Detailing, Structure Foundation Rebar Detailing.
Rebar Detailing is a procedure of making shop drawings for the steel reinforcement for the development procedure. The Rebar Detailing procedure incorporates the position, bending shapes, amount, description, laps of the reinforcing steel and measurements. The Rebar Detailing Drawings are made to incorporate the separating, area, rebar size and lap of steel. The Rebar Detailing Services includes: Rebar Detailing Services, Rebar Shop Drawings Services, Rebar fabrication Services, Rebar Framing Plan Design, Rebar Structure Foundation, Rebar Pit Design, Rebar Framing Plan, Rebar Beam Design, Rebar Structure Steel Detailing, Structure Foundation Rebar Detailing.
As a guideline, 4 inches thick, but it would depend on what is going to be sitting on top of it. You may need thicker and/or to reinforce it with rebar.
RCC is able to withstand heavy loads - compression from the concrete, tension from the rebar - , it is relatively cheap and easy to fashion into custom shapes even on site.
No. Earth is much weaker than cement and vegetable fibres are much weaker than iron.