Modeling of curing process of early-age concrete to assess buildability of 3D printed concrete structures

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2023-1-20

Author

Hashemzadeh , Amirali

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This work presents a possible mathematical framework for capturing the buildability phenomenon in 3D printed concrete structures. Mathematical frameworks are proposed to describe the curing and hydration kinetics of 3D printed concrete structures in their fresh state. This scheme is subsequently incorporated into three concrete plasticity damage models. In the first model, a microplane-based Drucker-Prager (DP) plasticity damage model is studied and the mathematical formulations of the remaining two models are adopted from published sources. The performance and parameter calibration of age-dependent elasto-plastic-damage schemes are evaluated using experimental stress-strain data gathered from uni-axial unconfined compression tests, performed on concrete specimens of varying ages. In performing numerical simulations, the last optimized early-age scheme is utilized along with a framework, quantitatively incorporating the printing process and its associated components. On the basis of simulation results of 3D printed structures, the self-weight-induced deformations in the principal directions and the impacts of various printing parameters are assessed. Lastly, as a real-life application of the proposed scheme, numerical simulations are repeated on a 3D printed column geometry, performed in the İston Inc. facility in Istanbul.

Subject Keywords

Early-age concrete, 3D printed concrete, Buildability, Curing, Hydration, Microplane framework, Drucker-Prager plasticity, Damage

URI

https://hdl.handle.net/11511/102052

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

A. Hashemzadeh, “Modeling of curing process of early-age concrete to assess buildability of 3D printed concrete structures,” M.S. - Master of Science, Middle East Technical University, 2023.