湿度变化对交替3D打印试件微结构及力学性能的影响研究

硅酸盐通报 ›› 2021, Vol. 40 ›› Issue (6): 1879-1888.

• 3D 打印水泥基材料 • 上一篇下一篇

湿度变化对交替3D打印试件微结构及力学性能的影响研究

曹乾菲¹, 崔冬¹, 史晓晗¹, 万逸^1,2, 左晓宝¹, 赖建中³

1.南京理工大学理学院,南京 210094;
2.北京大学物理学院,北京 100871;
3.南京理工大学材料科学与工程学院,南京 210094

收稿日期:2021-04-02 修回日期:2021-05-09 出版日期:2021-06-15 发布日期:2021-07-08
通讯作者: 崔冬,博士,讲师。E-mail:cuidong@njust.edu.cn
作者简介:曹乾菲(1997—),女,硕士研究生。主要从事3D打印混凝土的研究。E-mail:525526023@qq.com
基金资助:
国家自然科学基金(52008210,12004182);江苏省高性能土木工程材料重点实验室开放基金(1193171134959);南京理工大学自主科研专项基金(30920021146);江苏省自然科学基金青年项目(BK20200481)

Effect of Humidity Evolution on Microstructure and Mechanical Properties of Alternate 3D Printing Specimens

CAO Qianfei¹, CUI Dong¹, SHI Xiaohan¹, WAN Yi^1,2, ZUO Xiaobao¹, LAI Jianzhong³

1. School of Science, Nanjing University of Science and Technology, Nanjing 210094, China;
2. Department of Physics, Peking University, Beijing 100871, China;
3. Department of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China

Received:2021-04-02 Revised:2021-05-09 Online:2021-06-15 Published:2021-07-08

摘要/Abstract

摘要： 本文提出一种全新的硅酸盐水泥(PC)与碱激发矿渣(AAS)交替3D打印工艺,并基于该工艺打印了硅酸盐水泥-碱激发矿渣复合试件。在试件干燥前后,分别采用X射线断层扫描成像技术(CT)分析了各复合试件以及碱激发矿渣打印试件的微观结构,并测试了各试件干燥前后的抗折与抗压强度。结果表明,碱激发矿渣与硅酸盐水泥的抗干缩性能不同,在内部湿度下降时,两种材料的打印界面容易因干缩不一致而开裂,引起打印成品微结构劣化以及力学性能下降。尽管如此,采用交替3D打印工艺,硅酸盐水泥有效弥补了碱激发矿渣强度的不足,打印成品的抗折与抗压强度均高于碱激发矿渣打印试件。对比逐层交替与逐列交替两种3D打印方法,逐层打印试件的抗折强度更高,而逐列打印试件的抗压强度更高。上述研究成果对3D打印混凝土技术的推广运用有一定指导意义。

关键词: 3D打印, 交替打印, 微结构, 碱激发矿渣, 硅酸盐水泥, 增材制造

Abstract: This paper offers a novel alternate 3D printing technique using alkali-activated slag (AAS) and Portland cement (PC), based on which AAS-PC composite specimens were prepared. The microstructures of specimens before and after drying were analyzed separately using X-ray computed tomography (CT), and flexural and compressive strengths for all specimens before and after drying were tested respectively. The experimental results show that the interface between AAS and PC is inclined to crack during humidity reduction, as the shrinkage resistance for both materials varied, and that leads to deterioration of microstructure and decrease of mechanical properties for the printout. Despite that, PC effectively remedies the strength insufficiency of AAS, and the flexural and compressive strengths for AAS-PC composite specimens are thus better as compared to printed specimens using AAS. Comparing between layer-by-layer and line-by-line printing method, the former one produces specimens with better flexural strength, while the latter one produces specimens with better compressive strength. The above results offer guidances for promotion and application of 3D printing technique.

Key words: 3D printing, alternate printing, microstructure, alkali-activated slag, Portland cement, additive manufacturing

中图分类号:

TU528

曹乾菲, 崔冬, 史晓晗, 万逸, 左晓宝, 赖建中. 湿度变化对交替3D打印试件微结构及力学性能的影响研究[J]. 硅酸盐通报, 2021, 40(6): 1879-1888.

CAO Qianfei, CUI Dong, SHI Xiaohan, WAN Yi, ZUO Xiaobao, LAI Jianzhong. Effect of Humidity Evolution on Microstructure and Mechanical Properties of Alternate 3D Printing Specimens[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(6): 1879-1888.

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湿度变化对交替3D打印试件微结构及力学性能的影响研究

Effect of Humidity Evolution on Microstructure and Mechanical Properties of Alternate 3D Printing Specimens

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