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Development of a 3D Printer for Concrete Structures: Laboratory Testing of Cementitious Materials

Title
Development of a 3D Printer for Concrete Structures: Laboratory Testing of Cementitious Materials
Author
조병완
Keywords
3D printing; cementitious materials; concrete structure; mortar; slump-flow test
Issue Date
2020-03
Publisher
SPRINGEROPEN
Citation
INTERNATIONAL JOURNAL OF CONCRETE STRUCTURES AND MATERIALS, v. 14, no. 1, article no. 13
Abstract
This study deals with (a) the development of a prototype 3D printer for concrete structures having a bed size of 1 x 1 x 1 m for a laboratory testing and (b) laboratory testing of cementitious materials with different design mixes to find their suitability and efficacy for the developed 3D printer. In this printer, a program with the concept of computer numerical controlled milling was adopted to control the nozzle motion using an easy graphic user interface program. The experiment was carried out to test mechanical control and proper material properties of the printer. Thus, the optimum values of water-cement ratio of cementitious materials for the 3D concrete printer were determined by experimental trials. Also, the adequate viscosity of the material for layering and dispensing is determined by a slump-flow test. The suitable size of sands for the dispensing system was found through the trials. However, shrinkage cracks occurred during the hardening process for the paste and mortar that polyvinyl alcohol fibers are added to prevent the cracking and build an improved quality 3D printed structure. After suitable and efficient mix ratio is found, compressive strength is measured for the mechanical property. The experiments demonstrated possibility of printing concrete structure using the 3D printer.
URI
https://link.springer.com/article/10.1186%2Fs40069-019-0388-2https://repository.hanyang.ac.kr/handle/20.500.11754/162809
ISSN
1976-0485; 2234-1315
DOI
10.1186/s40069-019-0388-2
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > CIVIL AND ENVIRONMENTAL ENGINEERING(건설환경공학과) > Articles
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