层间水膜对3D打印混凝土界面性能的影响

硅酸盐通报 ›› 2023, Vol. 42 ›› Issue (7): 2281-2289.

所属专题：水泥混凝土

• 水泥混凝土 • 下一篇

层间水膜对3D打印混凝土界面性能的影响

芮遨宇, 王里, 马国伟

河北工业大学土木与交通学院,天津 300401

收稿日期:2023-04-06 修订日期:2023-05-06 出版日期:2023-07-15 发布日期:2023-07-25
通信作者: 王里,博士,教授。E-mail:wangl1@hebut.edu.cn
作者简介:芮遨宇(1999—),男,硕士研究生。主要从事3D打印混凝土耐久性能的研究。E-mail:ray19990520@163.com
基金资助:
国家自然科学基金(U20A20313);河北省自然科学基金(E2022202041);河北省研究生创新资助项目(CXZZSS2022047)

Effect of Interlayer Water Film on Interfacial Characteristics of 3D Printed Concrete

RUI Aoyu, WANG Li, MA Guowei

School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, China

Received:2023-04-06 Revised:2023-05-06 Online:2023-07-15 Published:2023-07-25

摘要/Abstract

摘要： 混凝土材料的制备与性能优化是建筑3D打印结构化发展与应用的基础。3D打印混凝土材料的宏观力学性能、长期耐久性能均与界面细观结构直接相关。本文明确了3D打印混凝土层间界面水分状态(水膜)的形成机制,测试了不同打印层厚条带的水膜随时间的演化规律,通过CT扫描技术研究了层间间隔时间、打印层厚、环境状态对层间界面孔隙特征的影响,揭示了层间界面水分状态、层间界面孔隙特征及层间黏结性能三者之间的相互影响机制。结果表明:层间界面孔隙率随单位面积上层间界面水分质量的增长而降低,层间界面水分质量是较打印参数而言更直接的层间界面状态影响因素;层间水分状态和界面细观孔隙特征直接影响着3D打印混凝土材料的宏观力学强度。

关键词: 3D打印混凝土, 层间界面, 水分状态, 孔隙特征, 黏结强度

Abstract: The preparation and performance optimization of concrete materials are the basis for the structural development and application of 3D printed building. The macroscopic mechanical properties and long-term durability of 3D printed concrete materials are directly related to the microstructure of interface. The formation mechanism of interlayer interface moisture state (water film) of 3D printed concrete was clarified, the evolution law of water film with time for different printing layer thickness strips was tested, the effects of time interval, printing layer height and environmental state on the pore characteristics of interlayer interface were studied by using CT scanning technology, and the interaction mechanism among interlayer interface moisture state, pore characteristics and binding performance was revealed. The results show that the interlayer interface porosity decreases with the increase of interlayer interface water mass per unit area, and the interlayer interface moisture quality is a more direct factor affecting interlayer interface state than the printing parameters. The interlayer interface moisture state and pore characteristics directly affect macroscopic mechanical properties of 3D printed concrete materials.

Key words: 3D printed concrete, interlayer interface, moisture state, pore characteristic, binding strength

中图分类号:

TU502

芮遨宇, 王里, 马国伟. 层间水膜对3D打印混凝土界面性能的影响[J]. 硅酸盐通报, 2023, 42(7): 2281-2289.

RUI Aoyu, WANG Li, MA Guowei. Effect of Interlayer Water Film on Interfacial Characteristics of 3D Printed Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(7): 2281-2289.

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层间水膜对3D打印混凝土界面性能的影响

Effect of Interlayer Water Film on Interfacial Characteristics of 3D Printed Concrete

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