干旱区生态环境知识资源中心(Arid): 3D printing eco-friendly concrete containing under-utilised and waste solids as aggregates

Arid

DOI	10.1016/j.cemconcomp.2021.104037
	3D printing eco-friendly concrete containing under-utilised and waste solids as aggregates
	Bai, Gang; Wang, Li; Ma, Guowei; Sanjayan, Jay; Bai, Mingke
通讯作者	Wang, L (corresponding author), Hebei Univ Technol, Sch Civil & Transportat Engn, 5340 Xiping Rd, Tianjin 300401, Peoples R China.
来源期刊	CEMENT & CONCRETE COMPOSITES
ISSN	0958-9465
EISSN	1873-393X
出版年	2021
卷号	120
英文摘要	3D concrete printing is an emerging construction technology, and presents an opportunity for utilising materials that are otherwise considered unsuitable for concrete construction. Incorporating underutilised solids and/or waste solids as aggregates is a way of gaining the maximum environmental and economic benefits from the emerging 3D concrete printing technology. In this study, desert sand (small size), river-sediment ceramsite sand (medium size), and recycled concrete (large size) were experimentally investigated for use as aggregates in the 3D printing of concrete. Three mixtures were designed with continuous, open, and interrupted gradations of solids, respectively, based on the theory of particle interference, and aiming to meet the requirements of extrusion-based 3D printing. The influences of the particle grading characteristics on the printability-related early-age behaviours, mechanical properties, and shrinkage resistance have been measured and analysed. The test results demonstrate that the self-supporting skeletal effect formed by the gradated particles reduces the flowability of the mixtures, but the structural build-up/buildability performance is improved (under the premise of the desired printability). The interlayer distribution and skeleton of the gradated aggregate contribute to improving the interfacial interlocking effect and contact bonding between layers; this is visually validated through computed tomography (CT) scanning. Further, the addition of aggregates reduces the proportion of cementitious composites, and therefore effectively mitigates the shrinkage of the cement matrix. The grading characteristics of the underutilised particle resources are crucial for regulating the early-age 3D printability. This article provides feasible solutions based on experimental data for promoting the eco-utilisation of underutilised and waste solids in 3D printing, and these solutions satisfy the minimum strength and durability requirements.
英文关键词	3D printing concrete Re-utilisation of solid resource Particle grading Printability Interlayer bonding Shrinkage
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000663256300006
WOS关键词	AGE AUTOGENOUS SHRINKAGE ; CEMENTITIOUS MATERIAL ; EXTRUSION ; CERAMSITE ; DESIGN ; FIBER ; PERFORMANCE ; WALL
WOS类目	Construction & Building Technology ; Materials Science, Composites
WOS研究方向	Construction & Building Technology ; Materials Science
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/349822
作者单位	[Bai, Gang; Wang, Li; Ma, Guowei] Hebei Univ Technol, Sch Civil & Transportat Engn, 5340 Xiping Rd, Tianjin 300401, Peoples R China; [Ma, Guowei] Hebei Univ Technol, Tianjin Key Lab Prefabricated Bldg & Intelligent, 5340 Xiping Rd, Tianjin 300401, Peoples R China; [Sanjayan, Jay] Swinburne Univ Technol, Fac Sci Engn & Technol, Hawthorn, Vic 3122, Australia; [Bai, Mingke] Yaobai Special Cement Technol R & Co Ltd, 336 Shenzhou 4th Rd, Xian 710100, Peoples R China
推荐引用方式 GB/T 7714	Bai, Gang,Wang, Li,Ma, Guowei,et al. 3D printing eco-friendly concrete containing under-utilised and waste solids as aggregates[J],2021,120.
APA	Bai, Gang,Wang, Li,Ma, Guowei,Sanjayan, Jay,&Bai, Mingke.(2021).3D printing eco-friendly concrete containing under-utilised and waste solids as aggregates.CEMENT & CONCRETE COMPOSITES,120.
MLA	Bai, Gang,et al."3D printing eco-friendly concrete containing under-utilised and waste solids as aggregates".CEMENT & CONCRETE COMPOSITES 120(2021).