耐久性不足可能是混凝土的内在原因,也可能是环境条件的影响,大多数情况下,往往是外因通过内因而起作用。外界因素有物理、化学和机械的原因,例如,由于风化作用、高温的影响、磨损、电解作用,以及自然或工业废水和废气的侵蚀作用等。内在的原因有混凝土的强度、密实度、酸碱度和可渗透性等。它们的好坏,对抵抗外界因素 Insufficient durability may be the intrinsic cause of concrete, or it may be influenced by environmental conditions. In most cases, it is often the case that the external cause passes through the interior. External factors have physical, chemical, and mechanical causes, for example, due to weathering, high temperature effects, wear, electrolysis, and the erosive effects of natural or industrial waste water and exhaust gases. The internal causes include the strength, density, pH, and permeability of the concrete. Their good or bad, against external factors