摘要
为了改善3D打印水泥基材料(3D-printed cement-based materials,3DPC)可打印状态,本文通过研究流变性能的相关参数,建立了静态屈服应力时变速率模型,得到了3D打印(3D-printed,3DP)的最大可操作时间点(maximal operating time,MOT).再结合水泥水化动力学过程,通过非接触式电阻率仪测试得到水泥水化诱导期的开始时间,拟合得到诱导期与MOT之间的关系,试验结果表明,MOT出现在诱导期开始前的某一时刻.且随着纳米粘土(Nc)掺量的增加,掺聚羧酸减水剂的水泥基材料诱导期开始时间提前,进而3DP可操作时间减短.本研究为延长3DPC可打印时间提供了理论基础.
In order to improve the printability state of 3D printed cement-base materials(3DPC)by studiyng the relevant parameters of rheological properties,a time-varying rate model of static yield stress is established,and the maximum operable time point(maximum operating time,MOT)of three-dimensional printing(3DP)is obtained.Combined with the dynamic process of cement hydration,the start time of cement hydration induction period is obtained through non-contact resistivity test,and the relationship between induction period and Mott is fitted.The test results show that Mott appears at a certain time before the beginning of induction period.With the increase of the content of nano clay(Nc),the induction period of cement-based materials mixed with polycarboxylate superplasticizer is advanced,and the 3DP operable time is shortened.The study provides a theoretical basis for prolonging the printable time of 3DPC.
作者
龚春燕
蒋亚清
王玉
潘亭宏
Gong Chunyan;Jiang Yaqing;Wang Yu;Pan Tinghong(School of Mechanics and Materials,Hohai University,Nanjing 211100,China)
出处
《南京师大学报（自然科学版）》
CAS
CSCD
北大核心
2022年第1期17-21,共5页
Journal of Nanjing Normal University(Natural Science Edition)
基金
国家自然科学基金重点项目(51738003).
关键词
水泥基材料
结构化速率
流变性能
电阻率
静态屈服应力
聚羧酸减水剂
cement-base material
structuring rate
rheological properties
resistivity
static yield stress
polycarboxylate superplasticizer
