Durability Environmental Regionalization for Concrete Structures

Table 1

Regionalization standard.

Regions		Primary regionalization criteria	Secondary regionalization criteria
I	Ia	𝑇1 ≤ −10°C; 𝑇: −4.8~8°C; RH7 ≥ 50%	pH𝑤>5.6
	Ib		4.5<pH𝑤≤5.6
II	IIa	𝑇1: −10~0°C; 𝑇: 8~14°C; RH7 ≥ 50%	pH𝑤>5.6 and 𝑆>3 km
	IIb		4.5<pH𝑤≤5.6 and 𝑆>3 km
	IIc		4.5<pH𝑤≤5.6 and 𝑆≤3 km
III	IIIa	𝑇1: 0~10°C; 𝑇: 14~20°C; RH7 ≥ 50%	4.5<pH𝑤≤5.6 and 𝑆>3 km
	IIIb		pH𝑤≤4.5 and 𝑆>3 km
	IIIc		pH𝑤≤4.5 and 𝑆≤3 km
IV	IVa	𝑇1 > 10°C; 𝑇: 20~25°C; RH7≈ 80%	4.5<pH𝑤≤5.6 and 𝑆≥3 km
	IVb		pH𝑤≤4.5 and 𝑆≥3 km
	IVc		4.5<pH𝑤≤5.6 and 𝑆≤3 km
V	V	𝑇1 ≤ −10°C; 𝑇: 2~9°C; RH7 ≤ 50%	pH𝑤>5.6
VI	VI	𝑇1: −10~0°C; 𝑇: 10~14°C; RH7 ≤ 50%	pH𝑤>5.6