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(一) 引言空气中的二氧化碳渗透到混凝土内,与碱性物质起化学反应生成碳酸盐和水,使混凝土原始碱度降低的过程称为混凝土碳化。碳化对混凝土性能有重要影响。其最严重的后果是使混凝土碱度降低,使钢筋表面的钝化膜遭受破坏,从而导致钢筋锈蚀,最终会造成建筑物的破坏。我国混凝土试验方法标准(草案)规定:混凝土碳化试验应在二氧化碳浓度为20±3
(I) Introduction The carbon dioxide in the air penetrates into the concrete and reacts with alkaline substances to form carbonates and water. The process of reducing the initial alkalinity of the concrete is called concrete carbonization. Carbonization has an important influence on the performance of concrete. The most serious consequence is to reduce the alkalinity of the concrete and damage the passivation film on the surface of the steel bar, resulting in corrosion of the steel bar and eventually damage to the building. China’s Concrete Testing Method Standard (Draft) stipulates that: Concrete carbonation test should have a carbon dioxide concentration of 20±3