Optimization of Internal Patterns in 3D-Printed Walls to Control Heat Transfer and Embodied Impact

Year 2026, Volume: 9 Issue: 1, 65 - 77, 15.01.2026

Anıl Kul

https://doi.org/10.34248/bsengineering.1792446

https://izlik.org/JA34EU45HJ

Abstract

This study presents the development and evaluation of a 3D-printable alkali-activated mortar formulated with brick masonry waste, utilized as both binder and aggregate to mitigate the environmental burden of Portland cement and reduce reliance on scarce industrial by-products. Mixtures with 50–80% recycled brick content were tested for fresh rheology, mechanical strength, thermal conductivity, and 3D-printability. Using the measured properties, finite-element thermal analyses were performed on five wall geometries with varying void configurations. The results indicate that increased void ratios substantially lower thermal transmittance, while the geometry and distribution of contact points critically influence heat transfer. The best-performing design achieved a U-value of ~4.1 W/m²K, corresponding to a 75% reduction compared to a solid wall of equal thickness. Complementary cradle-to-gate life-cycle assessment (LCA), confirmed reductions of 70–80% in embodied environmental impacts following geometric optimization. Collectively, these findings highlight the potential of integrating waste-derived geopolymer binders with optimized 3D-printed wall patterns to produce thermally efficient building envelopes. The outcomes support sustainable construction pathways and underscore the relevance of extending future research to explore multi-functional optimization (e.g., acoustic and structural performance), and the integration of passive insulation strategies to further enhance these 3D-printed systems.

Keywords

Additive manufacturing , Robotic 3D concrete printing , Thermal performance , Life-cycle assessment , Waste management

Ethical Statement

Ethics committee approval was not required for this study because of there was no study on animals or humans.

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