Extrusion-based 3D printing concrete with coarse aggregate: Printability and direction-dependent mechanical performance

doi:10.1016/j.conbuildmat.2021.123624

CORC > 兰州理工大学 > 兰州理工大学

	Extrusion-based 3D printing concrete with coarse aggregate: Printability and direction-dependent mechanical performance
	Chen, Yidong 1; Zhang, Yunsheng 1,2; Pang, Bo 1; Liu, Zhiyong 1; Liu, Guojian 3
刊名	CONSTRUCTION AND BUILDING MATERIALS
	2021-08-16
卷号	296
关键词	3DCP Extrusion-based Coarse aggregate Printability Direction-dependent strength Voids Interlayer area X-CT SEM
ISSN号	0950-0618
DOI	10.1016/j.conbuildmat.2021.123624
英文摘要	Concrete with coarse aggregate in the 3D concrete printing (3DCP) has broad prospects for high strength, low cost and shrinkage. In this study, an extrusion-based 3D printer was designed and utilized to print concrete with the largest aggregate size of 20 mm. Printable concrete with coarse aggregate was designed by different volume ratios of cement to aggregate (C/A). Then the effect of C/A on the printability and direction-dependent mechanical performance was investigated. X-ray micro-computed tomography (X-CT) was used to detect and analyze the voids distribution characteristics of printed specimens. Scanning electron microscope (SEM) investigations of microstructure at the interlayer area were conducted. Results indicated that the initial flowability of printable concrete should be within 178- 200 mm, and the recommended printable C/A was within 0.35-0.60. The decrease of C/A improved the maximum printing height and mechanical performance but weakened the shape-stability of the multi layer structure. X-CT results indicated that reducing excess slurry content caused by the decline of C/A decreased the compactness of the printed structure. The compressive strength and flexural strength of 3D printed specimens showed a direction-dependent characteristic, mainly related to the non-uniform distribution of voids revealed by X-CT. SEM images revealed the micro-bridging morphology in the interlayer area and proved that there were carbonation and structural weakening problems at the surface and surrounding of this area. (c) 2021 Elsevier Ltd. All rights reserved.
WOS研究方向	Construction & Building Technology ; Engineering ; Materials Science
语种	英语
出版者	ELSEVIER SCI LTD
WOS记录号	WOS:000663684300013
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/148989]
专题	兰州理工大学
作者单位	1.Southeast Univ, Sch Mat Sci & Engn, Nanjing 211189, Peoples R China; 2.Lanzhou Univ Technol, Sch Civil Engn, Lanzhou 730050, Peoples R China; 3.Suzhou Univ Sci & Technol, Sch Civil Engn, Suzhou 215011, Peoples R China
推荐引用方式 GB/T 7714	Chen, Yidong,Zhang, Yunsheng,Pang, Bo,et al. Extrusion-based 3D printing concrete with coarse aggregate: Printability and direction-dependent mechanical performance[J]. CONSTRUCTION AND BUILDING MATERIALS,2021,296.
APA	Chen, Yidong,Zhang, Yunsheng,Pang, Bo,Liu, Zhiyong,&Liu, Guojian.(2021).Extrusion-based 3D printing concrete with coarse aggregate: Printability and direction-dependent mechanical performance.CONSTRUCTION AND BUILDING MATERIALS,296.
MLA	Chen, Yidong,et al."Extrusion-based 3D printing concrete with coarse aggregate: Printability and direction-dependent mechanical performance".CONSTRUCTION AND BUILDING MATERIALS 296(2021).