Eurocode Concrete Durability Calculator
The SkyCiv Eurocode Concrete Durability Calculator enables engineers to determine the nominal cover and the minimum concrete strength class required to meet durability standards as specified in Eurocode 2 (EN 1992-1-1). This tool is part of the SkyCiv Quick Design Module.
About the Eurocode 2 Concrete Durability Calculator
What is Concrete Durability?
Concrete durability is the ability of a structure to maintain its serviceability, strength, and stability throughout its intended design life (typically 50 or 100 years) without excessive maintenance. Eurocode 2 (EN 1992) ensures durability by specifying minimum concrete cover and material quality based on the severity of the environment.
How Concrete Durability is Determined?
Durability is not calculated with a single formula but is ensured through a prescriptive approach where designers must satisfy several interlocking requirements:
- Identify Exposure Class: Determine the environmental conditions (e.g., XC1 for dry interiors).
- Determine Minimum Concrete Class: Each exposure class requires a minimum strength class (e.g., C30/37) to ensure low permeability.
- Calculate Nominal Cover (cnom). This is the distance from the surface to the reinforcement.
cnom = cmin + Δcdev
Where cmin is the larger of the minimum cover for bond (cmin,b) and the minimum cover for durability (cmin). Δcdev is an allowance for construction deviations (typically 10mm).
4. Control Crack Width: Maximum allowable crack widths are limited (e.g., 0.3mm) to prevent aggressive agents from reaching the steel.
Eurocode Exposure Classes
Environmental conditions are categorized into two groups. The first one relates to the exposure class for durability and resistance to corrosion, and the second one is the exposure class for chemical and physical attack. Both are based on the type of deterioration:
Eurocode Concrete Exposure Classes Table 1
Eurocode Concrete Exposure Classes Table 2
Concrete Strength Classes
Eurocode 2 uses strength as a proxy for durability. Higher classes are less permeable and more resistant to chemical ingress:
- Common Grades: C20/25, C25/30, C30/37, C35/45.
- Designation: The first number is the characteristic cylinder strength (fck); the second is the cube strength.
- High Strength: Designations go up to C90/105, which require modified design formulae due to different material behavior.
Eurocode Concrete Durability Calculator
The Eurocode concrete durability software automates the selection of cover and strength requirements based on EN 1992-1-1.
- Functionality: Users input parameters such as the exposure class, design working life (50 vs. 100 years), bar diameter, and quality control measures.
- Outcome: The calculator outputs the nominal cover (cnom) and the minimum concrete strength class required to meet durability standards.
Related SkyCiv Software
SkyCiv offers a wide range of Cloud Structural Analysis and Engineering Design Software, including:
- SkyCiv Quick Design
- Eurocode 3 Steel Design Software
- Eurocode 2 Concerete Column Design Software
- Eurocode 3 Timber Design Software
- Eurocode 2 Lap Length Software
- Eurocode 9 Aluminium Member Design Software
- Eurocode 3 Weld Group Design Software
- Eurocode 3 Bolt Group Design Software
- Eurocode Pad Footing Design Software
- Strip Footing Design Software
- Lateral Pile Stability Software
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