This research aimed to evaluate the chemical and microstructure parameters of cement pastes and electrochemical parameters of concretes, both contaminated with different levels of SO₃ (0.0%, 0.5%, 1.0% and 5.0%) due to the presence of pyrite. To evaluate the chemical and microstructural parameters, SEM and XRD tests were carried out in cement pastes, to detect the formation of deleterious products. The electrochemical parameters, such as corrosion potential, current density and electrical resistivity were measured in concrete samples to evaluate the reinforcements immersed in contaminated concretes and the susceptibility of these reinforcement concretes to the corrosion phenomenon. SEM and XRD tests, carried out up to 720 days, confirmed the presence of deleterious products, such as ettringite. The electrochemical analysis, which was performed during 1100 days, indicated significantly lower values of corrosion potential (around −600 mV) and higher values of current density (0.7 µA/cm²) for the reinforcement immersed in concrete with 5.0% of SO₃. Finally, the research concludes the greater susceptibility of pyrite contaminated concretes with 5.0 of SO₃ to the phenomenon of corrosion and the formation of deleterious products, therefore, being a harmful content for use in reinforced concrete elements.

这项研究旨在评估水泥糊的化学和微观结构参数以及混凝土的电化学参数，二者均受不同水平的SO ₃污染。（0.0％，0.5％，1.0％和5.0％）由于黄铁矿的存在。为了评估化学和微观结构参数，对水泥浆进行了SEM和XRD测试，以检测有害产品的形成。在混凝土样品中测量电化学参数，例如腐蚀电位，电流密度和电阻率，以评估浸泡在受污染混凝土中的钢筋以及这些钢筋混凝土对腐蚀现象的敏感性。长达720天的SEM和XRD测试证实存在有害产品，例如钙矾石。进行了1100天的电化学分析表明，腐蚀电位值明显较低（约-600 mV），而电流密度值较高（0.7 µA / cm ^2））用于将浸入有5.0％SO _3的混凝土中的钢筋。最后，研究得出结论：含有5.0 SO ₃的黄铁矿污染的混凝土对腐蚀现象和有害产品形成的敏感性更高，因此，对于钢筋混凝土构件而言，这是有害的。