不同胶凝组成对3D打印水泥基材料干燥收缩性能的影响

郑杰; 罗素蓉; 欧翔; 王世杰

doi:10.13204/j.gyjzG23021512

不同胶凝组成对3D打印水泥基材料干燥收缩性能的影响

doi: 10.13204/j.gyjzG23021512

郑杰¹,
罗素蓉^1, ,,
欧翔¹,
王世杰²

1. 福州大学土木工程学院, 福州 350116;
2. 福建省建筑设计研究院有限公司, 福州 350001

基金项目:

国家自然科学基金面上项目（52078139）。

详细信息

作者简介:
郑杰,男,1995年出生,硕士。

通讯作者:
罗素蓉,女,1963年出生,教授,lsr@fzu.edu.cn。

计量
- 文章访问数: 75
- HTML全文浏览量: 13
- PDF下载量: 1
- 被引次数: 0
出版历程
- 收稿日期: 2023-02-15
- 网络出版日期: 2023-12-18

Effects of Different Gelling Compositions on Drying Shrinkage Properties of 3D Printed Cement-Based Materials

1. College of Civil Engineering, Fuzhou University, Fuzhou 350116, China;
2. Fujian Provincial Institute of Architectural Design and Research Corporation, Fuzhou 350001, China

摘要

摘要: 为改善3D打印水泥基材料干燥收缩性能，将粉煤灰（FA）和矿粉（S）两种矿物掺和料以单掺和复掺的形式加入机制砂制备的3D打印水泥基材料中，研究不同胶凝组成对3D打印水泥基材料力学性能和干燥收缩性能的影响，并通过扫描电镜试验和压泵法测孔技术，分析其微观形貌和孔结构。试验结果表明：在单掺的情况下，粉煤灰和矿粉较低的活性抑制了材料强度的发展，其中粉煤灰在X方向的抑制效果最强，分别使28d抗压强度和抗折强度下降41%和23%。但矿物掺和料的骨架填充效应与火山灰效应可改善材料的孔隙结构，降低孔隙间的连通，减少水分消耗，抑制3D打印水泥基材料的干燥收缩；相同掺量下，粉煤灰与矿粉使总孔隙率降低了15.2%、9.8%，最可几孔径降低了43.2%、16.5%；掺量为30%粉煤灰和掺量为20%矿粉的试验组分别使材料28d干燥收缩值降低了41%和22%。复掺粉煤灰和矿粉使材料抗压强度和抗折强度分别降低27.5%和13.9%，对干燥收缩的抑制效果介于二者单掺之间，使28 d干燥收缩降低了23%~25%。
- 3D打印混凝土 /
- 不同胶凝组成 /
- 机制砂 /
- 收缩性能
Abstract: In order to improve the drying shrinkage performance of 3D printed cement-based materials, two mineral admixtures of fly ash (FA) and mineral powder (S) were added to the 3D printed cement-based materials prepared by machine-made sand in the form of single admixture and compound admixture. Scanning electron microscope and mercury intrusion porosimetry were used to research the microstructure and pore structure of 3D printed cement-based materials. The test results showed that:in the case of single addition, lower activity of fly ash and mineral powder inhibited the development of strength, and the inhibition effect of fly ash in the X, direction was the strongest, which reduced the 28 d compressive strength and flexural strength by 41% and 23%, respectively. However, the skeleton filling effect and pozzolanic effect of mineral admixtures could improve the pore structure, reduce the connectivity between pores, reduce water consumption, and inhibit the drying shrinkage of 3D printed cement-based materials. With the same content of fly ash and mineral powder, the total porosity was reduced by 15.2% and 9.8%, and the most probable pore size was reduced by 43.2% and 16.5%. Test group with 30% fly ash and 20% mineral powder reduced the 28d drying shrinkage by 41% and 22%, respectively. When fly ash and mineral powder were paired together, compressive strength and flexural strength decreased by 27.5% and 13.9%, respectively, and the inhibition effect on drying shrinkage was between that of single admixture, reduced the 28 d drying shrinkage by 23%-25%.
- 3D printed cement-based materials /
- different gelling compositions /
- machine-made sand /
- shrinkage performance

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参考文献(25)

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