aggressive chemical environment


— slightly aggressive chemical environment (gas, liquid or solid)

— aggressive industrial atmosphere


moderately aggressive chemical environment (gas, liquid or solid)


highly aggressive chemical environment (gas, liquid or solid)

a This exposure class is valid only as long as during construction the structure or some of its components is not exposed to more severe conditions over a prolonged period of time b Chemically aggressive environments are classified in ISO/DP 9690. The following equivalent exposure conditions may be assumed:

Exposure class 5 a: ISO classification A1G, A1L, A1S Exposure class 5 b: ISO classification A2G, A2L, A2S Exposure class 5 c: ISO classification A3G, A3L, A3S

Table 4.2 — Minimum cover requirements for normal weight concrete^

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