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Table 3 List of groundwater corrosion evaluation

From: Investigation and analysis of groundwater-derived damage to the Shahe ancient bridge site in Xi’an, China

Aquifer Corrosion evaluation Environment type Corrosive medium Content Limit value Corrosion level
Pore diving groundwater depth 5.20–5.80 m Corrosion of water to concrete structure according to environmental type II Sulfate content SO42− (mg/L) 153.6–165.1 < 300 Micro
Magnesium content Mg2+ (mg/L) 23.3–27.7 < 2000 Micro
Ammonium content NH4+ (mg/L) 0.2 < 500 Micro
Caustic content OH(mg/L) 0.0 < 43,000 Micro
Total salinity (mg/L) 557.82–575.6 < 20,000 Micro
Corrosion of concrete structure by permeable water A PH value 7.16–7.19 > 6.5 Micro
Aggressive CO2 (mg/L) 0.0 < 15 Micro
HCO3 (mmol/L) 3.75–3.80 > 1.0 Micro
Corrosion to reinforcement in reinforced concrete structures Long-term immersion Clcontent (mg/L) 20.9 < 10,000 Micro
Wet and dry alternation 100–500 Micro