Is it possible to mix sodium chloride NaCl (sel in alimentation) with water, in the laboratory, to assimilate the degree of salinity in sea water, for experiemtal reasons.
I agree with Russell on this. There is a difference in behaviour between exposure to pure NaCl and exposure to seawater. For example, the presence of sulphates will encourage ettringite formation, while the solubility of ettringite and gypsum are also lowered in the presence of chlorides. The presence of magnesium will also be a factor, with magnesium salts potentially attacking the C-S-H.
This is reflected in exposure classes, with seawater (XS) being recognised as being more aggressive than non-marine chlorides (XD).
A.S.T.M. has a synthetic seawater standard: ASTM D1141-75). The most important ingredients in g/l are NaCl (24.53), MgCl2 (5.20), Na2SO4 (4.09), CaCl2 (1.16). Then there are smaller amounts of KCl, KBr, NaHCO3, H3BO3. SrCl2, and NaF. SEE THE ASTM STANDARD. And the attached report.
If the intention is to simulate seawater, then the more extensive 'recipe' given in my previous answer is better than just mixing salt and water. The A.S.T.M. standards are accepted worldwide. Note also that the amount of salt specified by the standard is 24.53 g. This is much less than the 35 g given in a previous answer.
I agree with Russell on this. There is a difference in behaviour between exposure to pure NaCl and exposure to seawater. For example, the presence of sulphates will encourage ettringite formation, while the solubility of ettringite and gypsum are also lowered in the presence of chlorides. The presence of magnesium will also be a factor, with magnesium salts potentially attacking the C-S-H.
This is reflected in exposure classes, with seawater (XS) being recognised as being more aggressive than non-marine chlorides (XD).
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