Mathematical Problems in Engineering / 2013 / Article / Tab 2

Research Article

Durability Environmental Regionalization for Concrete Structures

Table 2

Environmental character and main reason of durability degradation of every regions.

RegionsEnvironmental character of primary regionsEnvironmental character of secondary regionsMain reason of durability degradation

IIaThis region has a long frigid winter which lasts 6 months or more; the January average temperature is −31~−10°C; and the number of annual snowfall days is 5~100 days with a long freezing period.No acid rain, far from coastlineSerious freeze-thaw damage, concrete carbonation, and reinforcing steel corrosion
Ib , far from coastlineSerious freeze-thaw damage, slightly acid rain corrosion, concrete carbonation, and reinforcing steel corrosion

IIIIaThis region has a long dry-cold winter; the January average temperature and minimum temperature in January are −10~0°C and −20~−30°C, respectively; the number of annual snowfall days is usually less than 50 days.No acid rain, far from coastlineFreeze-thaw damage, concrete carbonation, reinforcing steel corrosion
IIb , far from coastlineFreeze-thaw damage, concrete carbonation, and reinforcing steel corrosion, slightly acid rain corrosion
IIc , closer to the coastChloride ion corrosion, freeze-thaw damage, concrete carbonation, reinforcing steel corrosion, slightly acid rain corrosion

IIIIIIaMost of the parts of this region have a cold and clammy winter; the January average temperature is 0~10°C; the minimum temperature can drop below −10°C; the number of annual rainy days and snowfall days is about 150 days and 0~15 days, respectively. , far from coastlineSlightly acid rain corrosion, concrete carbonation, reinforcing steel corrosion, and slightly freeze-thaw damage
IIIb , far from coastlineSevere acid rain, concrete carbonation, reinforcing steel corrosion, and slightly freeze-thaw damage
IIIc , closer to the coastChloride ion corrosion, severe acid rain, concrete carbonation, reinforcing steel corrosion

IVIVaThis region has a long summer and no winter; the January average temperature is higher than 10°C, and average annual temperature is higher than 20°C; there is no significant difference among the four seasons, the average annual rainfall day is about 120~200 days. , far from coastlineConcrete carbonation, slightly acid rain corrosion, and reinforcing steel corrosion
IVb , far from coastlineSevere acid rain, concrete carbonation, and reinforcing steel corrosion
IVc , closer to the coastChloride ion corrosion, concrete carbonation, slightly acid rain corrosion, and reinforcing steel corrosion

VVThis region has a cold winter and hot dry summer; the January average temperature is −10~−22°C, and minimum temperature is lower than −40°C; the July average relative humidity is lower than 50%; the annual snowfall days is 5~100 days.No acid rain, far from coastlineSerious freeze-thaw damage, concrete carbonation,

VIVIThis region has a dry-cold winter and hot summer; the January average temperature is 0~−10°C; the July average relative humidity is lower than 50%; the annual snowfall days is 5~20 days.No acid rain, far from coastlineFreeze-thaw damage and concrete carbonation

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