Indeed, thanks to the natural pigments, the smoothing and patina effects, the inclusion in the mass of pebbles, wood ... your concrete can take on any appearance imaginable.
The step by step
Before you start Try it out, try it out and do some more, because a concrete floor is a bit like cooking, there is theory and practice! As you go, you will discover that such a finish is simpler to implement, more practical and more beautiful.
First prepare the surface that will receive your concrete.
Mark off the surface to be concreted with planks.
For surfaces greater than 3 m, provide expansion joints by partitioning the surface with thin planks 10 to 20 mm thick.
Depending on your project, especially if pebbles or wood are included, the thickness of the screed will be more or less important, but never less than 5 cm or more than 10 cm.
You can rent an electric concrete mixer, or make your concrete by hand ... if there aren't too many! You will need: - 50 kg of cement, - 120 liters of aggregates, - 30 to 35 liters of water, - 120 liters of dry sand; if it is wet, add 10 to 15% more sand… and a little less water.
If you want to tint your concrete, mix your powder pigments in a little water and add this colored water during preparation.
Then pour your concrete. For neophytes, the ideal is to proceed by small surfaces and therefore to have planned a mesh with thin boards which will thus serve as expansion joints.
For an effect with random coloring, sprinkle with powdered pigments, smooth with a plasterer, or with a float, in large circular movements if you want a smooth surface; integrate stones and wood for original patterns ... And let dry well.
Fill all the small "boxes" of your soil before removing the planks of joints. 5 Then fill these hollows with an elastomeric seal which will allow the surfaces to "live".
Good to know
Depending on the choice of cement and its dosage in relation to the aggregates or sands used, you will obtain concretes with a very different appearance. For a decorative screed, especially if you want to tint it, choose white concrete, that is to say made with white cement or white hydraulic lime and fine sand, with the clearest shade possible. On the other hand, if you want a smooth concrete with a more rustic appearance, opt for larger aggregates.
The Pro Council
A slight crazing of the surface remains completely normal and rather decorative ... especially when you have passed two crossed layers of satin or mat anti-wear varnish, which will further darken the design of these tiny cracks.
Know-how - home decor © La maison rustique - éditions Flammarion, 2006