For DIY concrete work use a ready-mix crack-resistant cement mix. Create a wood frame around the area you want to place concrete.
- Pour a layer of concrete mix and then add a steel reinforcement balls layer on top.
- Spray paint around the outside of the cement
- Install the rebar securely in place
- Tap the sides of the box using a hammer
- Cover the slab with a plastic sheet
- Remove the wooden frame.