不同激发方式对再生微粉活性的影响研究

Study on the Effect of Different Excitation Methods on the Activity of Regenerated Micronized Powder

为提高建筑垃圾再生微粉的利用率,通过不同种类的激发剂以及机械研磨处理来激发再生微粉的活性,制备水泥胶砂试体,以抗压强度、28 d活性指数以及微观结构为评价依据,研究不同种类、不同掺量激发剂对再生微粉活性的激发效果。结果表明:化学激发剂及机械球磨处理均可提高再生微粉的活性,在28 d龄期时,化学激发剂中4%Na_(2)SO_(4)激发效果最好,4%CaCl_(2)的激发效果最差,机械球磨处理中,90 min为最佳处理时间。从微观角度观察到再生微粉经过激发剂和机械球磨处理之后,其制成的胶砂试体结构变得更加平整和密实。

In order to improve the utilization rate of recycled construction waste micronized powder,the activity of recycled micronized powder was stimulated by different kinds of excitants and mechanical grinding treatment,and cementitious sand specimens were prepared to study the stimulation effect of different kinds and dosing of excitants on the activity of recycled micronized powder based on compressive strength,28 d activity index and microstructure.The results showed that both chemical exciter and mechanical ball milling treatment could improve the activity of regenerated micronized powder,and at the age of 28 d,4%Na_(2)SO_(4)in chemical exciter had the best excitation effect and 4%CaCl_(2)had the worst excitation effect,and 90 minutes in mechanical ball milling treatment was the best treatment time.From the microscopic point of view,it was observed that the structure of the colloidal specimens made of recycled micronized powder became more flat and dense after the treatment of exciter and mechanical ball milling.