物理激发再生微粉对再生混凝土力学性能的影响  

Effect of Physical Excitation on Mechanical Properties of Recycled Concrete

作　　者：贺炳楠 闫龙 李玉博 HE Bingnan;YAN Long;LI Yubo(School of Civil Engineering and Architecture,Wuhan Institute ofTechnology,Wuhan 430073,China;School of Civil Engineering,Architecture&the Environment,HubeiUniversity of Technology,Wuhan 430073,China)

机构地区：[1]武汉工程大学土木工程与建筑学院,武汉430073 [2]湖北工业大学土木建筑与环境学院,武汉430073

出　　处：《材料导报》2023年第S01期162-166,共5页Materials Reports

摘　　要：为了响应碳中和的号召,利用辅助胶凝材料取代水泥来减少水泥生产所带来的碳排放。采用物理活化再生微粉(Recycled concrete powder,RCP)作为辅助胶凝材料制备再生骨料混凝土(Recycled aggregate concrete,RAC),分别以10%、20%、30%取代率取代水泥制备再生混凝土和胶砂试块并测试其3 d、7 d和8 d抗压强度。通过控制研磨时间对RCP进行物理激发再根据其组成、粒径、火山灰活性来探讨再生微粉对抗压强度的影响。实验表明,随着水泥中再生微粉替代率的增加,再生混凝土和水泥胶砂抗压强度有降低趋势。物理激发可以增加RCP细度、优化其粒度分布进而提升RCP的火山灰活性,增加砂浆密实度,进而提高砂浆强度,但并不是研磨时间越长其活性越高,其中研磨30 min提升效果最佳。In response to the call of carbon neutrality,the use of auxiliary cementing materials instead of cement to reduce carbon emissions from cement production.Using physically activated recycled concrete powder(RCP)as an auxiliary cementitious material,the recycled aggregate concrete(RAC)was prepared.Recycled concrete and mortar test blocks were prepared by replacing cement with 10%,20%and 30%replacement rate,respectively,and their compressive strength at 3 d,7 d and 28 d were tested.According to the composition,particle size and pozzolanic activity of RCP,the influence of the regenerated powders on compressive strength was discussed.The experimental results show that the compressive strength of recycled concrete and cement mortar decreases with the increase of replacement rate of recycled micro powder in cement.Physical excitation can increase the fineness of RCP and optimize its particle size distribution to improve the pozzolash activity of RCP,increase the density of mortar,and improve the strength of mortar.However,the longer the grinding time,the higher the activity,among which grinding for 30 min has the best improvement effect.

关 键 词：再生微粉 力学性能 微观结构 物理激发 火山灰活性 

分 类 号：TV54[水利工程—水利水电工程]