高黏性水泥3D打印堵塞机理分析

硅酸盐通报 ›› 2023, Vol. 42 ›› Issue (6): 1931-1937.

所属专题：水泥混凝土

高黏性水泥3D打印堵塞机理分析

王益博^1,2, 任常在³, 闫明¹, 敖晨阳⁴

1.沈阳工业大学机械工程学院,沈阳 110870;
2.辽宁工业大学机械工程与自动化学院,锦州 121000;
3.齐鲁工业大学能源与动力工程学院,济南 250353;
4.中国人民解放军92942部队,北京 100161

收稿日期:2023-04-13 修订日期:2023-04-13 出版日期:2023-06-15 发布日期:2023-06-25
通信作者: 闫明,博士,教授。E-mail:lntu163@163.com
作者简介:王益博(1987—),男,博士研究生。主要从事混凝土3D打印方面的研究。E-mail:wyb_0316@126.com
基金资助:
国家自然科学基金青年基金(62203198,62203201);山东省重点研发计划(重大科技创新工程)(2022CXGC010701)

Blockage Mechanism Analysis of 3D Printing of High Viscosity Cement

WANG Yibo^1,2, REN Changzai³, YAN Ming¹, AO Chenyang⁴

1. School of Mechanical Engineering, Shenyang University of Technology, Shenyang 110870, China;
2. College of Mechanical Engineering and Automation, Liaoning University of Technology, Jinzhou 121000, China;
3. School of Energy and Power Engineering, Qilu University of Technology, Jinan 250353, China;
4. Unit 92942, Chinese People’s Liberation Army, Beijing 100161, China

Received:2023-04-13 Revised:2023-04-13 Online:2023-06-15 Published:2023-06-25

摘要/Abstract

摘要： 为解决高黏性水泥3D打印堵塞问题,通过构建3D打印平台开展了物理模拟试验,采用X射线衍射仪(XRD)和扫描电子显微镜(SEM)对硬化产物进行检测,并利用有限元软件Polyflow分析打印喷头内部流场,最后结合试验和数值仿真结果确认堵塞问题原因。结果表明:高黏性水泥的凝结时间在10~23 min,与普通硅酸盐水泥相比,其会更快地硬化形成棱形晶体;打印喷头内部的压力梯度在挤出口变径处达到峰值113.9 kPa,并且螺槽内的浆料以塞流形式输运;在3D打印过程中,部分浆料黏附在螺杆表面,并快速硬化形成的产物嵌入到螺杆微观凹凸表面中,而未黏附的浆料在筒内高压差作用下以塞流形式输送,在筒内变径处发生液相迁移,最终导致打印堵塞。研究结果可为高黏性水泥3D打印喷头设计提供理论支撑。

关键词: 高黏性水泥, 堵塞, 塞流, 压力梯度, 液相迁移, Polyflow

Abstract: In order to solve the blockage problem of 3D printing of high viscosity cement, physical simulation experiments were carried out by building up a 3D printing platform. The hardened products were detected by X-ray diffraction (XRD) and scanning electron microscope (SEM), and the internal flow field of printhead was analyzed by finite element software Polyflow. Combining with tests results and numerical simulation results, the reasons for the blockage problem were confirmed. The results show that the setting time of high viscosity cement is 10~23 min, which is faster than that of ordinary Portland cement to form prismatic crystals. The internal pressure gradient of printhead reaches a peak value 113.9 kPa at extrusion outlet, and the slurry in the channel is transported in the form of plug flow. During the process of 3D printing, part of the slurry adheres to the surface of the screw, and the product formed by rapid hardening is embedded in the micro-convex surface of the screw. The unadsorbed slurry in the channel is transported in the form of plug flow under the action of high pressure difference in the cylinder, and the liquid phase migration occurs at the variable diameter in the cylinder, which eventually causes the printing blockage problem. The research results can provide theoretical support for the design of 3D printing printhead used for high viscosity cement.

Key words: high viscosity cement, blockage, plug flow, pressure gradient, liquid phase migration, Polyflow

中图分类号:

TQ172
TU646

王益博, 任常在, 闫明, 敖晨阳. 高黏性水泥3D打印堵塞机理分析[J]. 硅酸盐通报, 2023, 42(6): 1931-1937.

WANG Yibo, REN Changzai, YAN Ming, AO Chenyang. Blockage Mechanism Analysis of 3D Printing of High Viscosity Cement[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(6): 1931-1937.

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高黏性水泥3D打印堵塞机理分析

Blockage Mechanism Analysis of 3D Printing of High Viscosity Cement

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