Mechanical Performance Optimization in Spray-Based Three-Dimensional-Printed Mortar Using Carbon Fiber
Publication: Journal of Materials in Civil Engineering
Volume 35, Issue 2
Abstract
From the perspective of the features of effective vertical and overhanging construction, the spray-based three-dimensional (S-3D) mortar printing technology has promoted the application of 3D printing in construction fields. Carbon fibers were used to optimize the mechanical performance of S-3D printed mortar. The effects of carbon fiber volume (0%, 0.5%, 1.0%, 1.5%, and 2.0%) and length (3 and 5 mm) on the working properties, printing accuracy, mechanical properties, and microstructural properties of the S-3D printed mortar were studied comprehensively. The test results showed that the S-3D printed mortar with the 1.5 vol% and 3 mm length carbon fiber (L3-V1.5 specimen) showed optimal printing accuracy in the single-layer and accumulative thickness tests. The S-3D printed L3-V1.5 mortar had the maximum flexural strength, which increased by 53.06% and 39.96% at 7 and 28 days, respectively, more than those of its cast counterparts. In addition, the S-3D printing process enhanced the interlayer bonding strength, and the ultimate interlayer splitting strength of the S-3D printed L3-V1.5 mortar increased by 2.16% and 3.33% at 7 and 28 days, respectively, more than those of the cast mortar without carbon fibers. The S-3D printing process improved the carbon fiber alignment and compactness and, thus, the mechanical properties of the S-3D printed mortar.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
The authors would like to acknowledge the financial support from the National Natural Science Foundation of China (No. 51908182), Natural Science Foundation of Hebei (No. E2020202043), and National Key Laboratory Foundation of Science and Technology on Materials under Shock and Impact (No. 6142902200304).
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Published In
Journal of Materials in Civil Engineering
Volume 35 • Issue 2 • February 2023
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© 2022 American Society of Civil Engineers.
History
Received: Jan 23, 2022
Accepted: May 18, 2022
Published online: Nov 29, 2022
Published in print: Feb 1, 2023
Discussion open until: Apr 29, 2023
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