钨尾矿粉对水泥基3D打印混凝土流变、水化及力学性能的影响  

Effect of Tungsten Tailing Powder on Rheology,Hydration and Mechanical Properties of Cement-based 3D Printing Concrete

作　　者：唐振中 贾鲁涛 林永权 吴捷 张亚梅[2,3] TANG Zhenzhong;JIA Lutao;LIN Yongquan;WU Jie;ZHANG Yamei(China Resources Cement Technology R&D Co.,Ltd.,Guangzhou 510460,China;Jiangsu Key Laboratory of Construction Materials,School of Materials Science and Engineering,Southeast University,Nanjing 211189,China;Nanjing Institute for Intelligent Additive Manufacturing Co.,Ltd.,Nanjing 210000,China)

机构地区：[1]华润水泥技术研发有限公司,广州510460 [2]东南大学材料科学与工程学院,江苏省土木工程材料重点实验室,南京211189 [3]南京绿色增材智造研究院有限公司,南京210000

出　　处：《材料导报》2024年第21期169-174,共6页Materials Reports

基　　金：国家自然科学基金重点项目(52130210);东南大学、华润水泥技术研发有限公司校企合作项目(C07702022201722)。

摘　　要：采用钨尾矿粉(TTP)部分取代水泥制备3D打印低碳混凝土,研究了钨尾矿粉对复合浆体流变性能及水化特性的影响,在此基础上,通过调整外加剂用量优化打印性能,成功制备了不同钨尾矿粉掺量的3D打印低碳混凝土。结果表明:受颗粒堆积和体系总比表面积的影响,钨尾矿粉的加入会降低复合浆体的初始静态屈服应力、动态屈服应力和塑性黏度;受稀释作用的影响,钨尾矿粉的加入会降低复合浆体最初2 h内的水化放热,从而降低静态屈服应力增长速率;3D打印混凝土试件的抗压强度随钨尾矿粉掺量的增大逐渐降低,在钨尾矿粉掺量相同时,浇筑成型试件抗压强度略高于3D打印试件。当钨尾矿粉掺量在45%以内时,可制备出28 d抗压强度在30~60 MPa范围内的3D打印混凝土试件。在实际工程应用中,可根据不同场景的需求,确定适宜的钨尾矿粉掺量。钨尾矿粉具备作为3D打印低碳混凝土原材料的潜力。Tungsten tailing powder(TTP)was used as a supplementary cementing material to partially replace cement in 3D printing low carbon concrete.The influence of TTP on the rheological properties and hydration heat of blended cement paste was investigated.Meanwhile,3D printing low carbon concrete with varying TTP content were successfully prepared by adjusting the dosage of additives to optimize their printability.The results show that the addition of TTP reduces the initial static yield stress,dynamic yield stress,and plastic viscosity of the blended cement paste due to particle accumulation and the reduction of total specific surface area of the system.According to the hydration heat results,the addition of TTP reduces the hydration heat release of blended cement in the first 2 h due to the dilution effect,reducing the growth rate of static yield stress with time.The compressive strength decreases as the TTP content increases,and the compressive strength of 3D printed specimen is slightly lower than that of cast specimen.3D printed concrete specimen with 28d compressive strength ranging from 30 MPa to 60 MPa can be prepared when the replacement ratio of TTP is less than 45%.The appropriate TTP dosage can be determined based on the various demands in different engineering applications.Overall,TTP has the potential to be used as raw material for preparing 3D printable low carbon concrete.

关 键 词：3D打印低碳混凝土 钨尾矿粉 流变 水化热 力学性能 

分 类 号：TU528.45[建筑科学—建筑技术科学]