BS EN 12370:2020 pdf free.Natural stone test methods – Determination of resistance to salt crystallisation.
BS EN 12370 1 Scope This document specifles a test method to assess the relative resistance of natural stones with an open porosity of greater than 5 %，measured in accordance with EN 1936, to damage caused by the rysalizaton of salts. The test is not necessary for low porosity stones. 2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 12407. Natural stone test methods Petrographic examination EN 12440, Natural stone一Denomination criterla 3 Terms and defnitions No terms and definitions are listed in this document. IS0 and IEC maintain terminological databases for use in standardization at the fllowing addresses: IEC Electropedia: availabl at ht//w..cwpe.awo. IS0 Online browsing platform: allable at htps:/:/wwww/6p/u4 Symbols For the purposes of this document the fllowing symbols apply. Ma is the mass of the dried specimen, in grams Ma1 is the mass of the dried specimen with label before first cyde, in grams Me is the mass of the dried specimen with label. after 15 cycles, in grams AM is the relative diference of masses before and ater testing (mass loss or mass galn), in percent. 5 Principle After drying to constant mass, the specimen is immersed in a solution of sodium sulphate, dried and allowed to cool to room temperature. This cycle is carried out 15 times and the percentage mass change measured. 6 Apparatus 6.1 Aventilated oven capable of maintaining a temperature of (105+ 5)°C 6.2 A weighing instrument capable of weighing the specimens to土0,001 g 6.3 A room or water bath capable of maintaining the temperature of the specdmens and solution to (2010.5)”C 6.4 A 14 % solution of sodium suphate decahydrate (Le. 14 g of NazSO4″ 10 H2O for every 86 g deionized water). The density of this solution at 20 C is 1 055 kg/m3.BS EN 12370 pdf download.