硫酸根对混凝土的影响

Effect of Sulfate on Concrete

以强度C40的混凝土为对象,选用常温状态下自然干燥的方式,选择800mg/L、6000mg/L、50000mg/L的硫酸钠侵蚀溶液浓度,在侵蚀期处于30d、90d、180d、270d、360d、580d的时候,通过钻芯、分层切片、研磨等方式进行水泥石粉末提取并做化学分析,以此检测硫酸根在混凝土中的含量及影响。结果表明:干湿循环作用下,硫酸盐对混凝土的侵蚀速度会加快,既会导致混凝土中硫酸根离子增加,还会造成混凝土备受侵蚀。而且随着侵蚀溶液浓度逐渐增大,硫酸根离子沉淀到混凝土的表层,混凝土则会按照从表层向内层的趋势下逐层剥离破损。

Taking the concrete with strength C40 as the object,the content and influence of sulfuric acid in concrete were detected by drilling core,slicing and grinding,and the content and influence of sulfuric acid in concrete were detected by natural drying at room temperature,800 mg/L、6000 mg/L and 50000 mg/L,sodium sulfate erosion solution concentration.When the corrosion period was30 d、90 d、180 d、270 d、360 d、580 d,the content and influence of sulfuric acid in concrete were detected by drilling core,slicing and grinding.The results show that the corrosion rate of sulfate on concrete will be accelerated under the action of dry and wet cycle,which will not only lead to the increase of sulfate ion in concrete,but also cause the corrosion of concrete.With the increase of the concentration of erosive solution,sulfate ion precipitates to the surface layer of concrete,and the concrete will be peeled off and damaged layer by layer according to the trend from the surface to the inner layer.