레올로지 정수를 활용한 3D Printing 공법 적용이 가능한 모르타르의 적층 성능 평가

초록

This investigation systematically evaluates the buildability characteristics of cementitious mortars designed for additive manufacturing applications through the establishment of quantitative correlations between rheological parameters and buildability performance metrics. A comprehensive rheological characterization protocol was implemented, encompassing flow curve analyses, oscillatory amplitude sweep measurements, and time-dependent thixotropic behavior assessments to elucidate the material’s complex rheological response. While extant literature has predominantly relied on Bingham model parameters—specifically yield stress and plastic viscosity—for material characterization, this research demonstrates the inherent limitations of these metrics in evaluating low-fluidity mixtures that exhibit satisfactory extrudability and buildability characteristics. The experimental findings reveal the inadequacy of conventional rheological parameters when applied in isolation, particularly in the context of additive manufacturing applications. Notably, oscillatory amplitude sweep measurements emerged as a superior analytical technique for characterizing the viscoelastic behavior of printable mortars, demonstrating that optimal layer-stacking performance correlates with specific viscoelastic regimes characterized by well-defined storage and loss moduli ratios. These empirical observations underscore the imperative for developing a more sophisticated rheological assessment framework that integrates multiple characterization techniques to accurately predict and optimize the performance of 3D-printable cementitious materials in construction-scale additive manufacturing applications.

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