Title: Taguchi Design of 3D Printable Concrete Mixtures and Investigation into the Interlayer Properties

Author(s): Wi

Publication: Web Session

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Date: 3/28/2022

Abstract:
The objectives of this study are to design printable cement-based mixtures using Taguchi method and exam interlayer microstructure and strength of printed samples. Taguchi method is a statistical mix design method, and it can reduce mix proportions to be tested into a minimized number using an orthogonal array. In this study, a commercially available, highly flowable, and rapid set cementitious grout is used as a cement replacement to achieve desired 3D printable paste mixtures promptly. Water-to-binder ratio (w/b), grout content, and viscosity modifying agent (VMA) are considered as primary variables in the paste mix proportioning. River sand and fibers are then added to the optimal paste mixture to obtain a plain mortar and a fiber-reinforced mortar. Extrudability and printability of all the mixtures are evaluated. The interlayer microstructure and strength of printable mixtures are examined for hardened samples using scanning electron microscope (SEM) and nano-indentation. The effects of the mix design variables, sand, and fiber additions on the microstructure and strength of the 3D printed hardened concrete are explicated.