how to pour and finish concrete?
1 Use a sawing motion to pull and push the 2x4 across the concrete as you move it down the length of the forms. This sawing motion helps prevent tearing as you level the surface.  Tilt the leading edge slightly away from the direction of travel to create a thin cutting edge where the screed board meets the concrete.
Use the 2x4 to level the concrete. Using the technique described below, move the 2x4 down the forms to remove excess concrete. Use a sawing motion to pull and push the 2x4 across the concrete as you move it down the length of the forms. This sawing motion helps prevent tearing as you level the surface.