Abstract
Binder jetting 3D printing (BJ3DP) is used to create geometrical and topology-optimized building structures via architectural geometric design owing to its high degree of freedom in geometry implementation. However, building structures require high mechanical and durability performance. Because of the recent trend of using 3D printing concrete as a structural component in reinforcing bars, its durability with respect to chloride penetration needs to be reviewed. Therefore, in this study, the compressive strength and durability of the chloride diffusion of cement-based 3D-printed output were evaluated. In addition, to confirm the performance difference based on the build orientation, the compressive strength and chloride diffusion were evaluated with respect to the build direction and transverse direction. The experimental results show that the compressive strength was approximately 22.1–26.5% lower in the transverse direction than in the build direction and that the chloride diffusion coefficient was approximately 186.1–407.1% higher in the transverse direction. Consequently, when a structure that requires long-term durability is produced using BJ3DP, it is necessary to examine the design and manufacturing methods in relation to the build orientation in advance.
Highlights
1.1. 3D Printing Technology for ConstructionAdditive manufacturing (AM), which is referred to as three-dimensional (3D)printing, is a concept that contrasts with subtractive manufacturing (SM), where material production is realized by cutting or trimming [1]
6athe shows the compressive strength of the activated materials (AAMs)
This shows that the influence of the output direction on the long-term durability performance is greater than that on the short-term mechanical performance
Summary
1.1. 3D Printing Technology for ConstructionAdditive manufacturing (AM), which is referred to as three-dimensional (3D)printing, is a concept that contrasts with subtractive manufacturing (SM), where material production is realized by cutting or trimming [1]. The application range of 3D printing technology and materials has been extended to daily necessities, machinery, electronics, and medicine. Experts in these fields have collaborated closely with construction technology engineers to create high-value- construction applications using 3D printing for geometries that are difficult to implement with existing methods, such as atypical members and geometry optimization [5,6]. ME3DP is a method of extruding construction materials, such as mortar and concrete, from a nozzle using pressure It is mainly used on-site for the construction of large members such as columns and walls owing to its advantages of easy on-site 3D printing and enlargement [7].
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