Journal
CEMENT AND CONCRETE RESEARCH
Volume 156, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2022.106764
Keywords
3D concrete printing; Digital concrete; Layered extrusion; Fresh concrete rheology; Green strength; Buildability; Rotational rheometry
Funding
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) [387152958, 424057211]
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This paper compares different indirect methods for assessing the buildability of 3D printed cementitious materials, discusses their benefits and disadvantages, and considers their potential for automated in-situ control of materials.
This paper presents a comparison between indirect methods for assessing the buildability of 3D printed cementitious materials, including constant rotational velocity (CRV) or constant shear rate (CSR) test using rotational rheometry, unconfined uniaxial compression test (UUCT), a newly proposed confined uniaxial compression test (CUCT), and fast penetration test. The experimental program was conducted on the extruded samples of six printable mortars and two printable concretes with various rheological behavior achieved by the use of different additives and admixtures. Predictions of the material failure and the stability failure in hollow cylindrical structures are provided and compared with the results of the direct printing test. Benefits and disadvantages of the employed test methods are discussed, also taking into consideration a perspective of their use for automated in-situ control of the materials' buildability.
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