湿热环境下混凝土受酸雨腐蚀的试验研究

为了揭示酸雨环境下混凝土性能的劣化规律,分别配置p H1.5、p H2.5和p H3.5的3种溶液来模拟不同酸度的酸雨,在实验室自动喷淋装置中模拟降雨和加热干燥,采用干湿交替的试验方法对100个C40混凝土试件进行不同程度的加速腐蚀,得出不同腐蚀状态下混凝土外观、质量、中性化、抗压强度的变化规律。试验结果表明：随着腐蚀时间的延长混凝土的外观有不同程度的劣化,中性化深度不断加深。混凝土质量、抗压强度在p H2.5和p H3.5条件下都是先短暂地增大后逐渐减小,而在p H1.5条件下是一直递减。

Experimental Study on Acid Corrosion of Concrete in Moist Heat Environment

In order to analyze the corrosion of concrete exposed to the acid rain environment, 3 kinds of solutions with pH of 1.5, 2.5 and 3.5 were prepared to simulate the acid situation. The tests were carried out in an automatic rainfall device with the wet-heat drying cycle method. One hundred C40 concrete specimens were exposed to the different simulated acid environments for certain periods to investigate the variation of concrete appearance, quality, neutralization and compressive strength. The results show as follows：Appearance of the concrete deteriorated gradually with the extension of corrosion time;Neutralization depth continued to increase along with time, and the lower the pH of the solution was, the greater the depth of neutralization became;Quality, compressive strength of the concrete decreased briefly first, then increased gradually under the condition of pH of 2.5 and 3.5, but constantly decreased under the condition of pH1.5.