3.2
Durability
Designer
- Specification of Exposure class(es) for elements (EN 206)
- For further guidance on aggressive chemicals and complex site conditions – refer to BRE Special Digest 1
- Alignment of strength class and exposure class limiting values - EN 206 NA (most onerous)
- Specific cement types permitted / required
- Aggregate type / size limitations
- Design life
- Type of concrete (i.e. reinforced, prestressed, plain etc.)
- Chloride class
- Curing class
- Thermal limitations
- Potential operational (or construction) conditions
- Reinforcement cover versus concrete mix trade-off for 50 & 100 year design lives(I.S. EN 206 National Annex – Annex NC)
- Approval of finish
Builder
- Timing of exposure to environmental conditions
- Curing regime
- Placing limitations (temperature)
Producer
- Identify most onerous limiting values (from exposure class(es) /strength)
- Mix design to satisfy these limiting values & other mix limits (e.g. alkalis)
- Selection of suitable materials (in accordance with EN 206)
- Cement / addition / aggregates /admixture
Further Guidance
Main Standards – Reference
I.S. EN 1990
I.S. EN 1992-1-1
Section 4 +NA
I.S EN 206
See NC annex in NA
