If you like the look of slate but find it too expensive, you can transform concrete to look like slate with readily available materials. Slate comes in a variety of colours including red, purple, green, blue-grey and black. Some varieties are mottled, which means they contain a combination of colours. Create the look of slate with concrete on exterior walkways and patios or inside your home on fireplace or wood stove hearths.
Dump the concrete mix into a mixing trough. Add the proper amount of water for the specific mix that you are using. Mix the concrete in the mixing trough using a trowel.
Select a pigment that resembles the colour of slate that you want to reproduce. Add the directed amount of pigment into the concrete mix for the amount of concrete you are mixing. Mix the pigment into the concrete with a trowel.
Fill the natural stone concrete form with concrete using a trowel. Select a concrete form that has the rough texture of slate. Allow the concrete to set up for the directed amount of time.
Remove the concrete from the mould. Allow the concrete to cure completely.
Seal the concrete with a concrete sealer to protect the slate look for your project.
Experiment with the amount of pigment you use to create a variation in the colours of your concrete. Slate is a natural material and has many colour variations from piece to piece.
Wear eye, face and hand protection when working with concrete.