Nominal Concrete Cover to Meet Durability Requirements (Clause 26.4.2)

Vocabulary flashcards covering nominal concrete cover requirements and reduction criteria based on exposure conditions under Table 16 (Clause 26.4.2).

Table 16 (Clause 26.4.2)

The standard specification table governing the minimum nominal concrete cover (in mm) required to meet durability criteria across various exposure conditions.

Mild exposure nominal cover

A nominal concrete cover not less than $20\,\text{mm}$.

Moderate exposure nominal cover

A nominal concrete cover not less than $30\,\text{mm}$.

Severe exposure nominal cover

A nominal concrete cover not less than $45\,\text{mm}$.

Very severe exposure nominal cover

A nominal concrete cover not less than $50\,\text{mm}$.

Extreme exposure nominal cover

A nominal concrete cover not less than $75\,\text{mm}$.

Cover reduction for mild exposure

A reduction of $5\,\text{mm}$ in nominal cover permitted for main reinforcement bars up to $12\,\text{mm}$ in diameter.

Cover reduction for 'severe' and 'very severe' exposure

A reduction of $5\,\text{mm}$ in nominal cover that may be made when higher-grade concrete is used.