Sep 2019 HOW TO ENHANCE OR CHANGE THE COLOUR OF CONCRETE
Correcting the colour of concrete may sound like a complicated process but see how Sephaku Cement simplifies this task with easy to follow solutions. Indoor, outdoor, decorative, or simply a faded pathway that needs a bit of a lift, changing the colour of concrete is fairly simple process depending on how elaborate the desired outcome is.
Changing or enhancing the colour of stamped concrete can be effectively produced by using different shades of staining, tinting or applying a dye. Where only a minor adjustment or enhancement is needed to existing pigments, applying a diluted acid stain works extremely well in accentuating the stamped etchings of decorative concrete, colouring a deeper shade between the grooves and a lighter hue on higher surfaces.
To see a more apparent change to the colour of stamped concrete apply a full-strength acid stain for an intense colour kick. Dyes and tinted stains are also a great option to use when looking for a more noticeable enhancement to original colouring of concrete installations.
For bold contrasts to what concrete was previously coloured with, acrylic or solid colour staining is the best option to use to mask previous colours and will result in a vast difference to what the concrete was once coloured before. When choosing a solid colour option to enhance concrete applications, be sure of the colour you select and your desired end result because once an acrylic solution is applied it can be both a tricky and costly exercise to remove if poorly matched.
Using a dye to colour concrete offers a variety of colours to select from and is a fairly simple way to pigment concrete installations. Where a stain results from a chemical reaction to the cement, when using a dye to colour concrete the process is non-reactive where the pigment in the dye simply absorbs or penetrates into the pores of the cement. Available as a water or solvent based solution, dyes can be used to create a translucent or marbled finish or can alternatively be applied as an intense colour resulting in a solid monotone effect.
Colour correcting efflorescence from concrete can be an ongoing struggle for darker coloured cement. An unsightly chalk like colour that seems to seep out of blackened concrete after getting wet. Efflorescence takes place as moisture evaporates from the pore like chambers of cured cement bonds. As the moisture evaporates it leaves behind calcium salts present in cement which causes the chalk-like crystals to appear on the surface of darker coloured cement. This effect actually occurs on all cement applications but is more visibly noticeable on contrasting darker pigmented concrete and is one of the leading reasons why many contractors will deter from using dark cement colouring on their projects. The only way to prevent this naturally occurring process is to incorporate a coloured curing compound to the concrete mix or alternatively (and potentially the more effective means to preventing efflorescence) is to use a concrete sealant matched to the colour of the concrete which will inhibit the process altogether.