Abstract

This Study Investigates the Effect of Thixotropy and Stiffness Evolution on the Extrudability and Buildability of 3D Printing Concrete. Different Types of Supplementary Cementitious Materials and Limestone Filler Were Used to Prepare Mortars with Varying Levels of Thixotropy and Early-Age Stiffness. Mixtures with Yield Stress and Flocculation (Τfloc) of 180–400 and 420–950 Pa, Respectively, Exhibited Adequate Extrudability Without Plastic Collapse. the Printing Was Completed 8–15 Min after Mixing at a Vertical Build-Up Rate of 138 Mm/min. Several Process Parameters, Including Rest Time to Secure a Penetration Resistance of 150 KPa (T150) and Penetration Resistance at Various Rest Times Were Developed to Assess Early-Age Stiffness. Results Indicate that the Penetration Resistance at Rest Time of 10–30 Min and T150 Can Be Correlated with the Buildable Height at Elastic Buckling. a Prediction Model of Buildable Height based on Penetration Resistance Was Proposed. the Early-Age Hydration Was Analyzed to Evaluate the Early-Age Stiffness.

Department(s)

Civil, Architectural and Environmental Engineering

International Standard Serial Number (ISSN)

0008-8846

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2024 Elsevier, All rights reserved.

Publication Date

01 Aug 2024

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