影响混凝土耐久性的原因有外界和内在的因素。属于外界的因素是混凝土所处的环境，有物理、化学、力学的因素，如经常遭受干湿、冷热、冻融交替等风化破坏作用以及磨损、冲刷、气蚀等作用；属于内在的因素有混凝土碳化、疲劳、钢筋锈蚀膨胀，碱与活性骨料反应以及由骨料和水泥 There are external and internal factors that affect the durability of concrete. The factors that belong to the outside world are the environment in which the concrete is located, and there are physical, chemical, and mechanical factors, such as the weathering damage that often suffers from dry-wet, cold-hot, and freeze-thaw cycles, as well as the effects of wear, erosion, cavitation, etc.; these are intrinsic factors. Carbonized concrete, fatigue, corrosion and expansion of reinforcing steel, reaction of alkali with active aggregate, aggregate and cement