Final answer:
The correct term for the corrugated steel used when casting concrete floors is a ribbed decking panel. This panel acts like a mold for the concrete, similar to pouring concrete into a wooden frame. Both steel and concrete have similar thermal expansion properties, hence they work well together in construction.
Step-by-step explanation:
When concrete floors are cast onto corrugated steel, the correct term for the steel would be a ribbed-decking panel. This is because the steel has a ribbed surface due to the corrugation which helps improve bonding with the concrete to enhance strength and stability. The steel panel acts as a form for the concrete, giving it its final shape. It's like creating a wooden mold, such as in the example you provided of pouring concrete into a wooden mold built in a certain framework.
In the case of concrete and steel, these materials work great together as they have nearly equal coefficients of linear thermal expansion. This means that both materials will expand and contract at similar rates under heat changes, thus preventing thermal stress within the concrete structure. This is critically important in the construction of buildings and other infrastructures to avoid structural problems in the future.
Learn more about Ribbed-Decking-Panel