Flowability prediction of recycled α-hemihydrate gypsum for 3D powder printing under combined effects of different glidants using response surface methodology

Shuangxi Zhou; Yuanjing Lu; Yuan Pan; Jianxin Li; Fulin Qu; Zhiyu Luo; Wengui Li

Developments in the Built Environment (Dec 2023)

Flowability prediction of recycled α-hemihydrate gypsum for 3D powder printing under combined effects of different glidants using response surface methodology

Shuangxi Zhou,
Yuanjing Lu,
Yuan Pan,
Jianxin Li,
Fulin Qu,
Zhiyu Luo,
Wengui Li

Affiliations

Shuangxi Zhou: School of Civil and Engineering Management, Guangzhou Maritime University, Guangzhou, 510725, China; Key Laboratory for Green Construction and Intelligent Operation of Offshore Infrastructure, Guangzhou, 510725, China
Yuanjing Lu: School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang, 330013, China
Yuan Pan: School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang, 330013, China
Jianxin Li: School of Civil and Engineering Management, Guangzhou Maritime University, Guangzhou, 510725, China; Key Laboratory for Green Construction and Intelligent Operation of Offshore Infrastructure, Guangzhou, 510725, China
Fulin Qu: Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China; Corresponding author.
Zhiyu Luo: Department of Civil and Environmental Engineering, National University of Singapore, 117576, Singapore
Wengui Li: School of Civil and Environmental Engineering, University of Technology Sydney, NSW, 2007, Australia

Journal volume & issue: Vol. 16
p. 100265

Abstract

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In this study, a high-value-added recycled α-hemihydrate gypsum (α-RHG) generated from WGP using the atmospheric pressure hydrothermal method (APHM) was utilized to manufacture a 3D printed material. The univariate and combined effects of affordable and high-performance glidants, including hydrophobic nano-silica (HNS) and soluble starch (SS), on the flowability of α-RHG were evaluated experimentally and modelled. The results revealed that the flowability of α-RHG can be enhanced by the proper univariate addition of HNS (e.g., <1.0 wt%) or SS (e.g., <3.0 wt%). In addition, the experimental and modelling results based on central composite design (CCD) using response surface methodology have consistently demonstrated that the optimal flowability of α-RHG can be achieved by incorporating an optimum combined addition of 1.0 wt% HNS and 3.0 wt% SS. Finally, a 3D printed sample with a flow rate of 3.16 g/s using the modified α-RHG powder with optimum addition of HNS and SS was successfully produced.

Published in Developments in the Built Environment

ISSN: 2666-1659 (Online)
Publisher: Elsevier
Country of publisher: United Kingdom
LCC subjects: Technology: Engineering (General). Civil engineering (General); Technology: Building construction
Website: https://www.journals.elsevier.com/developments-in-the-built-environment/

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