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Title: Influence of fibre aspect ratio on rheological performance for 3D printable materials
Authors: Angellee, Raymond Rafael
Keywords: Engineering::Civil engineering::Construction technology
Issue Date: 2019
Abstract: The concept of 3D printed materials has been widely used in the industries of present era. In particular, the construction sector is not unfamiliar with the term 3D printed concrete (3DPC). Improvements on the pumpability of concrete mix during printing have been continuously researched. However, fibre, a material widely researched in the mixture of common concrete mix, has not yet to be discussed upon regarding its influence towards 3D printed concrete. The process of 3D printing concrete involves several parameters, that include static and dynamic yield stresses, plastic viscosity, and thixotropy. These features are called the rheological properties. These critical parameters affect the process of how concrete mix flows out and settles upon printed. The experiment finds that higher fibre content contributes to higher value of static and dynamic yield stress and demonstrating decreasing trend for plastic viscosity. On the other hand, longer fibre unit contributes to decreasing trend of both yield stress while showing an upward trend for plastic viscosity. Both of these cases appear to show low thixotropy as the mass and length increase. Further research to implement the aspect of strength is needed, whereby a balanced result can be obtained by optimising the best out of both rheological properties and compressive strength of resulting concrete. In addition to that, a thorough procedure with exact timing for experiments should be taken note to avoid risk of cement settling before any test is carried out.
Schools: School of Civil and Environmental Engineering 
Rights: Nanyang Technological University
Fulltext Permission: restricted
Fulltext Availability: With Fulltext
Appears in Collections:CEE Student Reports (FYP/IA/PA/PI)

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