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Linking fresh paste microstructure, rheology and extrusion characteristics of cementitious binders for 3D printing
Author(s) -
Nair Sooraj A. O.,
Alghamdi Hussam,
Arora Aashay,
Mehdipour Iman,
Sant Gaurav,
Neithalath Narayanan
Publication year - 2019
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.16305
Subject(s) - extrusion , materials science , rheology , microstructure , cementitious , composite material , 3d printing , metakaolin , extrusion moulding , silica fume , compressive strength , cement
Abstract Cementitious binders amenable to extrusion‐based 3D printing are formulated by tailoring the fresh microstructure through the use of fine limestone powder or a combination of limestone powder and microsilica or metakaolin. Mixtures are proportioned with and without a superplasticizer to enable different particle packings at similar printability levels. A simple microstructural parameter, which implicitly accounts for the solid volume and inverse square dependence of particle size on yield stress can be used to select preliminary material combinations for printable binders. The influence of composition/microstructure on the response of pastes to extension or squeezing are also brought out. Extrusion rheology is used in conjunction with a phenomenological model to better understand the properties of significance in extrusion‐based printing of cementitious materials. The extrusion yield stress and die wall slip shear stress extracted from the model enables an understanding of their relationships with the fresh paste microstructure, which are crucial in selecting binders, extrusion geometry, and processing parameters for 3D printing.