Solublesalt content

The soluble-salt content of bricks is defined by three categories: low (S2), normal (S1) and no limits (S0) (Table 1.3). Both the S2 and S1 categories have defined maximum limits for sodium/potassium and magnesium salt contents. The soluble salts derive from the original clay or from the products of combustion during the firing process. Soluble salts can cause efflorescence and soluble sulfates may migrate from the bricks into the mortar or any rendering, causing it to expand and deteriorate by sulfate attack. If used in an exposed situation S1 and S0 category bricks should be bonded with sulfate-resisting cement mortar.

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