Reuse of excavated soil in 3D printing of sustainable earth-based mixtures for low energy buildings

Projektinformationen

RePrintCLAY

ID Finanzhilfevereinbarung: 101068760

DOI

10.3030/101068760

Projekt abgeschlossen

EK-Unterschriftsdatum 18 Juli 2022

Startdatum 1 September 2022

Enddatum 30 September 2024

Finanziert unter

• Marie Skłodowska-Curie Actions (MSCA)

Gesamtkosten

Keine Daten

EU-Beitrag

€ 211 754,88

Koordiniert durch

UNIVERSITE DE BRETAGNE SUD
France

Periodic Reporting for period 1 - RePrintCLAY (Reuse of excavated soil in 3D printing of sustainable earth-based mixtures for low energy buildings)

Berichtszeitraum: 2022-09-01 bis 2024-09-30

Zusammenfassung vom Kontext und den Gesamtzielen des Projekts

The project focuses on developing sustainable 3D-printable earth mixes by utilizing excavation waste, paving the way for environmentally responsible construction practices. The construction industry faces significant challenges, including resource depletion, high carbon emissions and excessive construction waste generation. Additionally, the industry inherently suffers from a shortage of skilled labour, making automation an imminent necessity. This project addresses these challenges by revalorizing excavation waste into a viable, printable construction material, contributing to the circular economy and promoting sustainable building solutions with automation potential.
The primary objective of the project was to develop and optimize low-carbon earth-based mixes utilizing waste streams and byproduct resources, making them suitable for additive manufacturing. Through a series of experimental investigations and sustainability assessments, the project aimed to achieve a balance between printability, mechanical performance and environmental impact. Key challenges addressed included optimizing mix compositions, enhancing mechanical properties and validating printability using industrial robotic systems.

Arbeit, die ab Beginn des Projekts bis zum Ende des durch den Bericht erfassten Berichtszeitraums geleistet wurde, und die wichtigsten bis dahin erzielten Ergebnisse

The project's approach was structured into five work packages, covering material characterization, mix optimization, mechanical performance evaluation, environmental sustainability and real-world application through full-scale 3D printing trials. The research led to the identification of an optimal activator system consisting of Sodium Silicate and Sodium Carbonate, in combination with Ground Granulated Blast Furnace Slag (GGBS) as a binder which satisfied the required properties for both fresh and hardened states. The developed mixes exhibited promising mechanical strength, durability and printability, making them suitable for practical applications in construction. Another significant aspect of the project was the evaluation of the environmental performance of the developed materials through a comprehensive Life Cycle Assessment (LCA). This assessment provided valuable insights into the carbon footprint and resource efficiency of the developed materials, ensuring that they meet sustainability benchmarks. Additionally, the potential of these mixes to regulate indoor climate conditions was explored by measuring their Moisture Buffering Values (MBV), which assess their ability to contribute to occupant comfort in buildings.

Key Achievements and Expected Impact
The project has resulted in several key outcomes that contribute to the advancement of sustainable construction technologies:
1. Development of optimized low-carbon earth-based mixes with enhanced printability and mechanical performance.
2. Successful 3D printing trials demonstrating scalability and feasibility for real-world applications.
3. Sustainability validation through LCA studies ensuring alignment with environmental goals.
4. Knowledge dissemination and capacity building achieved through conference presentations, teaching engagements and scientific publications.
5. Potential societal impact as the developed materials offer a sustainable alternative for housing and infrastructure with the possibility of enhancing indoor climate through moisture regulation.

Fortschritte, die über den aktuellen Stand der Technik hinausgehen und voraussichtliche potenzielle Auswirkungen (einschließlich der bis dato erzielten sozioökonomischen Auswirkungen und weiter gefassten gesellschaftlichen Auswirkungen des Projekts)

The project’s results have been widely shared with the scientific community and industry stakeholders through participation in international conferences, seminars and anticipated publications in leading scientific journals. The ongoing collaboration with academic institutions and industry practitioners ensures that the findings will continue to contribute to future research and practical implementation in sustainable construction.