Prestressed Precast Concrete

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Types and Durability

Description

Pre-stressed Precast Concrete

 Expected Lifespan

(Years)

 Adjustment Factors
General
Prestressed precast concrete floor slab complying with CP 81:1999 or BS 8110: Parts 1 and 2 or , cement requirement to ASTM C 150 and aggregate to ASTM 256 or BS 7543.

  • solid planks
  • inverted T
  • channel
  • double T
 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:

Within 20m from expressway: -20% years.

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

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

Within 20m from seawater/ prone to salt spray: -15% years
Floor slab not complying with BS 8110: Parts 1 and 2 or CP 81:1999. < 35

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