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混凝土结构的劣化通常是在自然环境及使用环境的作用下,混凝土结构由表及里的侵蚀破坏。其中,混凝土碳化是混凝土结构物劣化的重要诱因,而混凝土所处的大气环境是影响混凝土碳化的关键因素。通过试验研究大气环境因素包括CO_2浓度、温度和相对湿度对混凝土碳化程度的影响规律。结果表明CO_2浓度和温度越大,混凝土碳化深度越大;经过45 d加速碳化龄期、相对湿度为70%时混凝土碳化深度达到最大,超过20 mm。混凝土的碳化过程是一个由表及里的过程,碳化造成表层混凝土的碱度降低,进而逐渐导致混凝土结构的劣化。
The deterioration of concrete structure is usually under the influence of the natural environment and the use environment, the concrete structure is damaged by the erosion of the surface and the interior. Among them, carbonation of concrete is an important inducement for the deterioration of concrete structure, and the atmospheric environment in which concrete is located is the key factor that affects the carbonation of concrete. The influence of atmospheric environment factors including carbon dioxide concentration, temperature and relative humidity on the carbonation degree of concrete was studied through experiments. The results show that the greater the carbon dioxide concentration and temperature, the greater the carbonation depth of concrete. After 45 days of accelerated carbonation, the depth of carbonation reaches the maximum at 20% relative humidity of 70%. The process of carbonation of concrete is a process by the table, carbonation caused by the surface of the concrete alkalinity decreased, and then gradually lead to the deterioration of concrete structures.