Download Durability of concrete structures : investigation, repair, by Geoffrey Mays PDF

By Geoffrey Mays

ISBN-10: 0203239997

ISBN-13: 9780203239995

ISBN-10: 0203473477

ISBN-13: 9780203473474

ISBN-10: 0203781716

ISBN-13: 9780203781715

ISBN-10: 0419156208

ISBN-13: 9780419156208

ISBN-10: 0442314272

ISBN-13: 9780442314279

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Extra info for Durability of concrete structures : investigation, repair, protection

Sample text

Reactive particles on or near the surface of concrete do not expand and crack because any gel produced is easily accommodated by exudation to and away from the surface. 3 Concrete deterioration caused by external agents As discussed earlier, concrete is inherently porous although with ‘good’ concrete the permeability to gases and liquids is very low. However, the outer 24 Deterioration mechanisms Fig. 8 Unrestrained map cracking on parapet wall due to alkali-silica reaction. ‘skin’ of concrete cast against shuttering or trowelled in some way is cement and water rich and is more porous than the body of concrete.

This is because normal air contains carbon dioxide which reacts with the hydroxides in the cement paste and converts them to carbonates which have a much reduced alkalinity and no longer form the passive film on steel. The passive film can also be destroyed by reaction with chlorides. These may be incorporated in the concrete at the time of manufacture or may enter the concrete from an external source at a later age. 03% carbon dioxide gas (CO2) and this reacts with hydroxides to form carbonates.

Reactive particles on or near the surface of concrete do not expand and crack because any gel produced is easily accommodated by exudation to and away from the surface. 3 Concrete deterioration caused by external agents As discussed earlier, concrete is inherently porous although with ‘good’ concrete the permeability to gases and liquids is very low. However, the outer 24 Deterioration mechanisms Fig. 8 Unrestrained map cracking on parapet wall due to alkali-silica reaction. ‘skin’ of concrete cast against shuttering or trowelled in some way is cement and water rich and is more porous than the body of concrete.

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Durability of concrete structures : investigation, repair, protection by Geoffrey Mays


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