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Additional info for Concrete Society - Assessment, design and repair of fire-damaged concrete structures(Final Draft)

Example text

As mentioned earlier, the assessment of fire damaged structures can follow two methodologies, which can be combined: 1. Testing of fire damaged concrete to directly assess the concrete quality 2. Estimation of fire severity to deduce temperature-profiles and hence calculate the residual strength of the concrete or the reinforcement. 2 Testing It is sensible to define a procedure to test the structure. The aim is to establish zones in ceiling areas or damage classes of individual structural members.

But, in a concrete member, only the temperature of the outside layers is drastically increased and the temperature of the internal concrete may be comparatively low. 20: 300mm diameter circular columns. It is important to note that the development of temperature in a real fire differs from the standard temperature time curve. Hence it is difficult to deduce the effects of a real fire from standard tests. A more straight forward way is to estimate realistic time:temperature distributions within the compartment and conduct heat transfer analysis.

However, the thermal expansion is considerably larger than that of concrete, which may be a point to be considered where the temperature range is large. For further information the designer should refer to Concrete Society Technical Report 26, Repair of concrete damaged by reinforcement corrosion(38). 4 amended The materials are applied by hand and the full details of the methods of preparation and application should be supplied by the manufacturer. The work will closely follow other repair methods and the details given in Concrete Society Technical Report 26, will be applicable to fire damage repairs.

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