橡胶粉对再生混凝土围护结构氯离子渗透性的影响研究

Study on the effect of chloride permeability of recycled aggregate concrete mixed with rubber powder

以再生混凝土的氯离子非稳态迁移系数的为标准,对掺入不同量橡胶粉;掺入不同粒径橡胶粉的C10、C15、C20三个强度等级的再生混凝土的氯离子渗透性能进行研究,并用扫描电子显微镜对试件的微观结构进行观察研究。结果表明:掺入橡胶粉可以改善再生混凝土的抗氯离子渗透性能;加大掺量,减小掺加橡胶粉的粒径均可以降低再生混凝土的氯离子渗透性。相对而言,减小橡胶粉的粒径较加大橡胶粉的掺量对于改善再生混凝土抗氯离子渗透能力作用更明显。

Taking the non - steady - state migration coefficient of recycled aggregate concrete as standard,it studied the effect on the chloride permeability of three intensity levels of the recycled aggregate concrete when mixed with different content and particle size of rubber powder and observe the microstructure of the specimens by SEM.It finally draw a conclusion that the mixture of rubber powder would improve the chloride permeability of recycled aggregate concrete;the increase of content and the reduction of particle size of the rubber powder could both decrease the chloride permeability of recycled aggregate concrete.As compared to the increase of content,the reduction of particle size of rubber powder had more obvious effect on improving the chloride permeability of recycled aggregate con-crete.