Method of forming a waffle slab with concrete surfaces that do not require polishing

A method of forming a waffle slab with concrete surfaces that do not require polishing, comprising:

• providing steel molds connected to each other, wherein a space is formed in the steel molds and at least one of the steel molds has a hole;
• disposing a plurality of inner molds in the space formed by the steel molds;
• disposing predetermined steel bar cages between the plurality of inner molds, and between the plurality of inner molds and the steel molds;
• disposing a steel plate on top surfaces of the steel molds, wherein the steel plate comprises separately distributed air holes;
• filling the space from the hole of the at least one of the steel molds with a Self-Compacting Concrete (SCC);
• cleaning the steel molds after the step of providing steel molds connected to each other;
• and
• providing a connecting tube connected to the hole, such that the SCC fills in the space through the connecting tube and the hole, and a position of the hole is at the bottom portion of at least one of the steel molds.