I stopped by my job site today to have a peek at the formwork for the curved concrete steps and landing at the back of the house. I was impressed by how quickly the pros got it done.
I noticed that they contained the fill at the center of the pour with a metal mesh box. This way they could use much less concrete than if the landing and stairs had been solid.
Here are the steps today after they pulled the forms and finished the concrete:
I learned that the concrete cost around $900, the integral color (slate green) cost $1600, and the labor to form and finish was about $2000.