Change Trend of Phreatic Groundwater Quality and Corrosiveness in a City in North China from 2018 to 2022
In this paper,based on the analysis results of water quality test of an Phreatic Groundwater Observation Project in a city in North China from 2018 to 2022,a statistical analysis of PH value,chlo-ride,sulfate,total hardness,Zn,Cu plasma is conducted.The results show that the pollution degree of phreatic groundwater in the central city is deteriorating year by year.According to the water quality grade evaluation,it is mainly devided into two main grades:poor(Class Ⅲ)and extremely poor(Class Ⅴ),among which extremely poor(Class Ⅴ)reached nearly 76%.Phreatic groundwater in the central city causes weak corrosion and micro-corrosion on concrete structure in the absence of dry-wet alternate envi-ronment.It causes medium corrosion and weak corrosion in the dry-wet alternate environment,and strong corrosion is not distributed.The steel bars in the concrete are mainly subject to medium corrosion and weak corrosion in the dry-wet alternate environment.Under long-term immersion conditions,none of mi-cro corrosion,weak corrosion,medium corrosion and strong corrosion appears.This paper draws the cor-rosion zoning range of phreatic groundwater quality in the central urban area in 2022,which can provide a reference for anti-corrosion design in engineering construction in the city.
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