不同取水时间地下水对混凝土结构的腐蚀性

Effects of the Groundwater Corrosion on the Concrete from the Different Sampling Time

研究了唐廊高速宝芦立交收费站(BL)、岳龙服务区(YL)、丰津路联络线收费站(FJ)三个场地不同取水时间段地下水对混凝土结构、钢筋混凝土结构中钢筋腐蚀性的影响,研究了时间效应对地下水腐蚀性的影响。得出同一场地内地下水中SO42-、Mg2+、总矿化度对混凝土结构腐蚀性级别均随着时间的增长保持在同一级别,时间效应对腐蚀性的影响较小;同一场地内地下水中Cl-对钢筋混凝土结构中钢筋的腐蚀性级别均随着时间的增长保持在同一级别,时间效应对腐蚀性的影响较小。勘察期间应进行干钻取水进行地下水腐蚀性的测试,以保证地下水水分析结果的准确性。

This paper presents the groundwater corrosion to the foundation element test results.The water samples are collected from three toll collection locations in Tang-Lang Expressway：BL,YL and FJ.The groundwater at various sampling time were tested for its corrosion to the concrete and steel reinforcement bars.The sampling collection time effect on the water corrosion is also studied.The results indicate that,within the same site,the impact of sulfate contents,magnesium contents and total salinity on the concrete and steel corrosion do not change with time.The same conclusion can be extended to the chloride content on the corrosion of the concrete and the steel.It is also recommended and the drilling only with clean water should be used in order to have an accurate groundwater sampling.