NOTE I Suppliers of some indicator solutions also provide a fixing solution that permanently fixes the colour change.Ī magnifier and a gauge with a precision of 0,5 mm.Ī storage chamber with a carbon dioxide concentration within the storage chamber in percent by volumeĪs indicated in Clause 4, temperature at (20 ± 2) ☌ and a relative humidity at (57 ± 3) %, see Annex A Where needed, a fixing solution to permanently fix the colour change in the concrete specimen, see Clause 7. Phenolphthalein powder should be handled with the greatest care using safety gloves in a fume cupboard fitted with an extractor. WARNING - Phenolphthalein is listed In REACH appendix 2 and Its lists of substances of very high concern. ![]() ![]() BS EN 120 pdf free download.Testing hardened concrete Part 12: Determination of the carbonation resistance of concrete – Accelerated carbonation method.Ī solution of 0,8 g of phenolphthalein powder dissolved in a solution of 70 ml ethanol and 30 ml of deionised water or a suitable alternative indicator giving a colour change in the range pH 8 to 11 that gives a sufficiently clear colour change in concrete to differentiate the neutralized zone, e.g.
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