滨海侵蚀性环境对混凝土的腐蚀试验研究

Experimental Study on Concrete under Coastal Corrosion Environment

总结了地下水对混凝土的腐蚀作用机理,分析了经过土壤长期腐蚀后混凝土的抗压强度试验数据,分析表明,不同混凝土试件在相同土壤中的强度变化规律不尽相同。对某地铁工程沿线地下水进行取样,分析了其化学成分,并对其腐蚀性进行评价。然后根据地下水中Cl-和SO42-的含量配制4种不同浓度的腐蚀性溶液,进行混凝土试块的腐蚀试验,测定试块的质量变化和抗压强度。试验结果表明:混凝土试块质量有所增加,但各溶液中变化趋势不一致;另外,不同溶液中混凝土试块的抗压强度变化规律也不同。试验结论可为类似研究和工程实践提供参考。

The mechanism of concrete corrosion caused by groundwater is summarized in the present research. The data of compressive tests on concrete subjected to long-term corrosion are analyzed. Results indicate that the strength variation regularities of different concrete specimens were different after long-term corrosion in soil. After field sampling of groundwater along a subway line, the groundwater＇ s chemical composition was analyzed, and its corrosion was evaluated. According to the ratios of C1- and SO42- in the groundwater, four corrosive solutions of different ratios were prepared for concrete corrosion tests. The mass loss and compressive strength of concrete speci- mens were measured after the corrosion. Test data show that the mass of concrete specimens increased. Moreover, the variation trend of mass and compressive strength of specimens in different solutions were different. The test con- clusion could be a reference for similar studies and engineering practices.