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Discuss Anhydrite adhesive test. in the UK Tiling Forum area at TilersForums.com.
i drive my wife mad with just how much tiling
is under my skin. I just thought i would
through this in the mix, why is it that gypsum
and cement seem to work harmoniously
in the world of plastering?
It will most likely be due to strength gain due to moisture loss. Gypsum loses strength when it is wet or rather gains strength by losing moisture. It has free moisture loss from the underside of the adhesive. If it was stuck on the screed this loss of moisture wold be impeded by the fact that it is trapped between the screed and the tile. It would achieve enough strength to stick as the screed would pull the moisture but but as this would dissipate into the top part of the screed the moisture loss therefore strength gain may be slower. The chemical reaction or crystallisation of gypsum in anhydrite screed accounts for about 65% of its overall strength. The rest of its strength is due to friction between the gypsum crystals which increases with drying. i have to make the assumption that gypsum adhesive is similar. If that makes sense.As another very small test, while using Gypfix with porcelain tiles I spread the back of a tile and put it to one side. 6 days later the adhesive has stuck extremely well to the tile. This tile was not fixed to the screed so this makes me wonder why ?
Ok makes sense! Cheers dave clears that up! I don't claim to know loads about anhydride screeds. Have tiled quite a few. one of the first with builders spec not sanded ardex p51 primer tile fixed with cement based flexi, I was ignorant to the type of screed and didn't question it then. That was few years ago and doing fine! I've returned to it and it's good as new. Unlike the 30 m I had to reset that was fixed with gypsum base. Just leaves me a bit unsure
Reply to Anhydrite adhesive test. in the UK Tiling Forum area at TilersForums.com
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