Home>BS standards>BS EN 12370:2020 pdf free

BS EN 12370:2020 pdf free

BS EN 12370:2020 pdf free.Natural stone test methods一Determination of resistance to salt crystallisation.
This document specifies 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 crystallization 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 — Denomination criteria
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://wwwelectropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp/ui
4 Symbols
For the purposes of this document, the following symbols apply.
Md is the mass of the dried specimen, in grams
Mdl is the mass of the dried specimen with label before first cycle, in grams
M is the mass of the dried specimen with label, after 15 cycles, in grams
tiM is the relative difference of masses before and after testing (mass loss or mass gain), 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 A ventilated oven capable of maintaining a temperature of (105+5) °C
6.2 A weighing instrument capable of weighing the specimens to+0,001 g
6.3 A room or water bath capable of maintaining the temperature of the specimens and solution to (20+0,5)°C
7 Preparation of specimens
7.1 Sampling
The sampling is not the responsibility of the test laboratory except where specially requested. At least six test specimens, which are considered representative of the body of stone being tested, shall be selected.
7.2 Dimensions of test specimens
Cubes of (40 ± 1) mm sides shall be prepared. Specimens shall be wet diamond sawn and any surface irregularities removed by grinding.
7.3 Washing
All loose material shall be washed from the surface of the specimen using potable water.BS EN 12370 pdf free download.

Related PowerPoint Templates

Template Categories