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Additional info for Durability Design of Concrete Structures (Rilem Report)

Sample text

Failure’ of Rd being smaller than Sd does not mean a collapse or other mechanical failure, but running under the safety level requirement. Safety in terms of not falling below the safety level is called the durability safety, and is distinct from the mechanical safety. Respectively the term ‘durability failure’ is used distinct from the mechanical failure. The structural durability design is very similar to normal structural design. Here the load-bearing capacity is, however, a time-dependent quantity because of the time-related material losses in concrete and steel.

Thus Rds is decisive in the present study. 4, showing an almost linear reduction tendency. 2 PROPOSED PROCEDURES FOR STRUCTURAL DURABILITY DESIGN The proposed design procedure includes the following phases: 1. ordinary mechanical design 2. durability design 3. final design. Two methods are proposed for phase 3 (final design): 1. separated design method comprising a simple integration of the results of phases 1 and 2; 2. combined design method where the mechanical design is newly performed as Rd(td)>Sd(td), applying the results of phase 2.

Abrasion Abrasion Erosion Cavitation Cracking, scaling Rutting, wearing, tearing Surface damage Caves with a relationship to strength parameters are used instead. This leads to a risk of contradictory requirements of design parameters. For this reason, the water-cement ratio of concrete, which is often used as a design parameter of concrete proportioning, is not considered suitable for structural design. Another reason for rejecting it as a parameter of structural design is that cement replacements such as blast furnace slag, fly ash and silica fume have been increasingly incorporated into concrete mixes, obscuring the whole concept of the water-cement ratio.

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