Prestressed Precast Walls

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Types and Durability

Description

Precast Concrete

Expected Lifespan

( Years )

Adjustment Factors
Internal
Precast wall complying with BS 8110: Parts land 2 or CP 81:1999, with cover to steel complying with Table 3.3 and specified to match the appropriate exposure category selected from Table 3.2. Minimum nominal cover to all reinforcement of 20mm. Minimum cement content 275kg/m³.
35+
1st stage adjustment factor:

In industrial areas (heavy polluted): -15% years

In urban areas: -10% years

In suburban areas: -0% years

2nd stage adjustment factor:

Structural members subjected to ‘very severe’ exposure conditions to Table 3.2 of BS 8110: Part 1, without additional surface protection: -30% years.

Within 20m from express way: -20% years

Within 20m from major arterial road: -10% years

Within 20m from light traffic road: – 5% years

Within 20m from sea water/ prone to salt spray: -15% years

Test certificate from approved local testing authority : +15% years

Unclassified, ie precast wall not complying with BS 8110: Parts 1 and 2 or CP 81:1999 .

< 35

Combination of adjustment factors (1st stage and 2nd stage) should be added to obtain the durability values. Refer to durability calculator