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3D concrete printing is an emerging technology for the next generation of construction industry. Being an additive manufacturing technology with computer modeling and layer-based structures, it enables the creation of complex architectural designs efficiently and cost-effectively. To reduce carbon emissions and achieve the carbon neutrality goals in 2050, Nano and Advanced Materials Institute (NAMI) has developed a 3D concrete printing technology using a high-strength and low-carbon concrete with the support from the Government and industry partners. This advancement marks a significant step toward sustainable construction and offers numerous benefits.
 

NAMI’s 3D printing technology using high-strength low-carbon concrete supports sustainable construction development.

Reduced Waste and Carbon Emission - NAMI’s 3D concrete printing materials minimise carbon footprint by incorporating fly ash, GGBS and recycled aggregates. The precise control over material usage further reduces waste.

High Strength - With NAMI’s proprietary surface treatment applied to locally recycled aggregates, excessive water absorption is prevented, which enhances quality consistency. The treatment also improves bonding between aggregates and cementitious materials, achieving a strengthened structure with a compressive strength exceeding 40 MPa. 

Streamlined Production - The introduction of a specified thixotropic agent reduces viscosity under stress, significantly enhancing printability. These printable materials are integrated with advanced robotic systems and digital tools to achieve streamlined production.
 

NAMI’s printable materials are integrated with robotic systems and digital tools for streamlined production.

Design Flexibility - The efficient transition from design to 3D printing process allows for greater flexibility in creating intricate architectural forms and innovative construction solutions with precision and speed.

Various large-scale landscape architecture and garden furniture produced by this 3D printing technology have been successfully deployed in several locations in Hong Kong, including:
 

Various large-scale landscape architecture and garden furniture produced by this 3D printing technology have been successfully deployed.
 

NAMI’s low-carbon and high-strength concrete for 3D printing is durable, lightweight and low-cost, endowing its potential for indoor and outdoor furniture and architecture, as well as eco-shoreline. By leveraging local waste resources and advanced 3D concrete printing technology, NAMI is propelling the construction sector towards carbon neutrality, aligning with the Government’s commitment to reducing carbon emissions and fostering sustainable innovation.