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Posted 20 hours ago

Bostik Colours for Cement, For Concrete, Mortar, Render and Screeds, Available in 5 Intermixable Colours, For Interior and Exterior Use, Colour: Buff, Size: 1kg

£9.9£99Clearance
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In some cases it is possible to take a sample of the original mortar, break it down and separate out the sand. With a sample of the original sand to hand you can then use it to compare against sand from different sources until you find an exact or very close match. Step 1 – Get Samples If you are working with lime then you will also need to do the same, but with lime you will only be working with ratios between 3:1 (3 sand to 1 lime) and 5:1 (5 sand to 1 lime). Now, pour your sand solution gently over the top. The tights will act as a sieve, allowing the remaining water/acid solution to drain off, leaving you with just your sand. You now need to drain off your sand solution. Using a container with a fairly large mouth that can again be sealed, stretch an old pair of tights over the mouth and secure it with a strong elastic band.

Now that we have established the probable types of sand and cement or lime that was used for the original mortar mix, all that remains is to match the correct cement content. Get in touch with any local historians or custodians of local monuments or historic buildings as it is likely that they will know exactly where the majority of original materials used were sourced from. The next part is a waiting game! You will need to leave the solution for 2-3 days for the Muratic Acid to get to work on the on the cement and dissolve it (and also any lime that may also be present). If you have read through the above you should now know exactly why mortar can vary in colour and how a fresh mortar mix can be a totally different colour to existing mortar, it’s now time to look at the methods that can be used to actually colour match cement and mortar. Experiment With Different Mortar Mixes and Raw Materials Essentially, there is no science involved in matching a sand and cement mix to that of your existing wall or property, it’s really just a question of trial and error and also possibly a little research.

So as you can see, not only does the colour and type of the sand that used in a mortar mix affect its colour but so does the cement and the presence of lime if it has been used. How do I Know What Colour Sand was Used in the Original Mortar? From concrete plastisicers and mortar water proofers to cement accelerators, retarders, dyes and everything in between, we’ve got it at Selco.

On having a close look at the sand, pay attention to the size of the particles. If they are fairly small and of a uniform size, then it most cases this will be a standard building sand. However if small visible stone chips of varying sizes are evident this may indicate the possible use of sharp sand. Step 8 – Dispose of Acid Solution Some mortars are artificially coloured with a cement dye or mortar tone. This makes the permutations endless as you not only have to think about the sand and cement that was used but also what dye was used! Concrete mix coloured grey due to colour of the cement used What Other Factors Affect Mortar Colour?As we have mentioned above, the real key to matching mortar colour is to work out exactly what type of sand was originally used. Once dried, simply hold your sample board up to the existing mortar and look along the line until you spot a close or identical colour match and this will indicate the mix ratio to go for. As we have established, the colour and tone of the sand that is used in your mortar mix has pretty much the greatest bearing on the overall colour of new mortar. Aside from the techniques we have run through above for extracting sand from the original mortar, which is very effective by the way, you can also undertake some local research. While waiting for your test mixes to dry you can still do some preliminary tests by giving a section of your existing mortar a good soaking with some water. This should then reflect the damp drying state of your test mixes

It’s no coincidence that both the colour of most standard mortars and cement is a grey’ish colour. This is due to the fact that the grey colour-tones of the cement go a fair way into the overall colour of the mortar. Once your new mortar has dried it will change colour very slightly. This may be even more evident over a large area Ask if you can have a small sample of each so that you can run some colour matching experiments (more on this later). Its boring and time consuming, but if you do not want your repairs to stand out a mile off, it has to be done!If you know the age of your property and its pre-1900’ish then the chances are it may feature a lime-based mortar, especially if it is light in colour. Or if you’re looking for versatile, multi-purpose additives that can do it all, we’ve got some great products including the Sealorend Waterproofer, Retarder and Plasticiser that is especially handy when working with larger areas, as well as the SBR Admixture which serves as a bonding agent, sealer, primer and waterproofer in one. Final specifications?If further advice is required, one of our Mortar Specialists can visit with our Mortar Colour Selector to assist in finding an appropriate match. Call our Mortar Helpline on 0800 667 827 for more details. Matching mortar colours is often required with older, period properties where repairs that are carried out need to be made invisible.

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