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Frost resistance
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Bricks are classified into one of the three categories, F2, F1 and F0 according to their frost resistance within a standardized freezing test (Table 3.2).
Table 3.2 Designation of freeze/thaw resistance and active soluble salts content for clay bricks
| Durability designation | Freeze/thaw resistance |
| F2 | masonry subjected to severe exposure |
| F1 | masonry subjected to moderate exposure |
| F0 | masonry subjected to passive exposure |
| Active soluble salts content | |
| S2 | sodium/potassium 0.06%, magnesium 0.03 |
| S1 | sodium/potassium 0.17%, magnesium 0.08 |
| S0 | no requirement |
Only category F2 bricks are totally resistant to repeated freezing and thawing when in a saturated condition. Category F1bricks are durable, except when subjected to repeated freezing and thawing under saturated conditions. Therefore, category F1 bricks should not be used in highly exposed situations such as below damp-proof courses, for parapets or brick-on-edge copings, but they are suitable for external walls which are protected from saturation by appropriate detailing. Category F0 bricks must only be used where they are subject to passive exposure, as when protected by cladding or used internally.
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Дата публикования: 2014-11-02; Прочитано: 556 | Нарушение авторского права страницы | Мы поможем в написании вашей работы!
