Table 5 ASTM C1202 classification of chloride permeability.

From: Prediction of rapid chloride permeability using silica fume, fly ash, GGBS and micro fibers based geopolymer concrete

RCPT range (C)

Permeability class

Indicative chloride ion penetrability

 > 4000

High

Very high risk of chloride ingress

2000–4000

Moderate

Moderate permeability and less durability

1000–2000

Low

Good resistance to chloride penetration

100–1000

Very low

Highly durable against chloride ingress

 < 100

Negligible

Excellent durability and dense microstructure

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