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再生复合微粉活性评价及其对胶砂强度影响因素分析
作者：王辉1，谢祥兵2，王凯威2，李军3，王鹏涛4
（1.郑州路桥建设投资集团有限公司，河南 郑州 450007；2.郑州航空工业管理学院，河南 郑州 450046；
3.河南省乾坤商品混凝土有限公司，河南 郑州 450047；4.郑州航空港汇港发展有限公司，河南 郑州 451162）
摘要：以建筑固废砖粉和混凝土粉、工业固废粉煤灰为原料采用球磨法制成再生复合微粉，以再生复合微粉掺量、水胶比、养护龄期为变量进行胶砂强度试验，采用火山灰比强度法对其活性进行评价，并通过DSC-TG对其水化产物进行分析。结果表明，随着水胶比增大，胶砂强度降低；随着龄期延长，强度降幅逐渐减小，随其掺量逐渐增大，强度先升高后降低，再生复合微粉掺量≤25%时，活性指数均值为0.745，90 d龄期时，其活性指数大于1。DSC-TG分析表明，掺入再生复合微粉并未改变水泥水化产物种类，再生复合微粉火山灰效应显著降低CH含量，降幅为15.52%。
关键词：再生复合微粉；胶凝材料；活性评价；力学性能；比强度法
中图分类号：TU528.09 文献标识码：A 文章编号：1001-702X（2022）08-0133-05
Activity evaluation of recycled composite micro-powder and analysis of influencing factors on mortar strength
WANG Hui1，XIE Xiangbing2，WANG Kaiwei2，LI Jun3，WANG Pengtao4
（1.Zhengzhou Road & Bridge Construction Investment Group Co. Ltd.，Zhengzhou 450007，China；
2.Zhengzhou University of Aeronautics，Zhengzhou 450046，China；
3.Henan Qiankun Commercial Concrete Co. Ltd.，Zhengzhou 450047，China；
4.Zhengzhou Airport Huigang Development Co. Ltd.，Zhengzhou 451162，China）
3.Henan Qiankun Commercial Concrete Co. Ltd.，Zhengzhou 450047，China；
4.Zhengzhou Airport Huigang Development Co. Ltd.，Zhengzhou 451162，China）
Abstract：Clay brick powder，concrete powder，and fly ash are used as raw materials to form recycled composite powder by ball milling. The mortar strength test was carried out with the replacement amount of composite micro-powder，micro-powder，water-cement ratio，or curing age as variables，and the activity was evaluated by the method of pozzolan specific strength method. DSC-TG was analyzed for hydration products. The results show that with the increase of the water-cement ratio，the strength of mortar decreases. With the extension of age，the strength decreases gradually. With the addition of dosage，the strength first increases and then drops. When the dosage of recycled composite micro-powder is less than or equal to 25%，the average activity index is 0.745. When the age is 90 d，the activity index is greater than 1. DSC-TG shows that the type of cement hydration products is not changed after adding recycled composite micro powder. The pozzolanic effect of recycled composite micro powder significantly reduces the content of CH by 15.52%.
Key words：recycled composite micro-powder，cementitious material，activity evaluation，mechanical properties，specific strength method