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碳化是混凝土中性化的一种常见形式,系指大气中的CO_2不断向混凝土内部扩散并与其中水泥的碱性水化产物、主要是Ca(OH)_2发生反应的物理化学过程.碳化将使混凝土的碱度强度和收缩等性能发生变化.国内外一般认为,除了氯离子的侵蚀以外,混凝土碳化所导致的碱度降低通常是钢筋锈蚀的重要前提,混凝土本身的抗碳化能力是反映它对钢筋保护性能的指标之一,也是影响钢筋混凝土耐久
Carbonization is a common form of neutralization of concrete. It refers to the physical chemical process in which CO2 in the atmosphere continuously diffuses into the concrete and reacts with the alkaline hydration products of the cement, mainly Ca(OH)2. The properties of concrete such as alkalinity and shrinkage are changed. It is generally believed that in addition to the erosion of chloride ions, the decrease in alkalinity caused by carbonization of concrete is usually an important prerequisite for the corrosion of steel bars. The carbonation resistance of concrete itself is a reflection of its One of the indicators of the protective performance of steel is also affecting the durability of reinforced concrete.