湖南省中部地区酸雨对混凝土耐久性的影响

近年来我国大气污染造成的酸雨危害日益严重，对环境造成了不可忽视的影响。本项目分析湖南省中部地区酸雨酸度、成分、降雨量的变化趋势，基于酸雨对混凝土的腐蚀机理，通过模拟酸雨腐蚀的实验方法，研究酸雨对湖南省中部地区混凝土耐久性的危害程度并提出有效的防护措施。试验研究表明：酸雨对混凝土的影响是不容忽视的。混凝土在酸雨的影响下主要发生一般的酸类腐蚀、硫酸盐腐蚀、软水腐蚀和混凝土的碳化作用等，使得混凝土表面生成薄膜，出现损伤，力学性能劣化和中性化，很大程度上影响了混凝土的耐久性。经过试验得出混凝土的抗压性能明显降低。为了减轻和避免工程实际中由于酸雨的危害产生的不良影响，防治混凝土受酸雨侵蚀显得尤为重要。

Effects of Acid Rain in the Central Area of Hunan Provinceon the Durability of Concrete

In recent years,acid rain caused by air pollution in China is worsening,and the impact caused by it can not be ignored for our living environment. The project based on the concrete corrosion mechanism studies the degree of acid rain harm to concrete durability in central region of Hunan Province and presents effective protective measures by analyzing trends of acidity,composition,rainfall and simulating the acid rain corrosion of concrete. The studies show that the impact of acid rain on the concrete can not be ignored. Concrete acid corrosion occurs mainly in general under the influence of acid rain,sulfate attack,car_bonation of soft water corrosion and concrete,etc. ,so that the film is formed on the surface of concrete,damage occurs,the deterioration of mechanical properties and neutral,largely influences durability of concrete and makes the concrete compressive reduce significantly. In order to reduce and avoid adverse impacts of acid rain,erosion prevention and treatment of concrete are very significant.