University of Hong Kong researchers develop 3D-printable material for Mars construction

Researchers at the University of Hong Kong have developed a new method for 3D printing structures on Mars using In-Situ Resource Utilization (ISRU). The approach involves combining sand or regolith-like materials with gelatin and genetically engineered yeast to create a building material that can harden under Martian conditions.

This method aims to solve the logistical challenge of transporting heavy construction materials from Earth, which is prohibitively expensive and difficult. Unlike sulfur-based concrete, which requires heating sulfur to approximately 115–120 degrees Celsius, this yeast-based binder could potentially be produced with significantly lower energy requirements.

In laboratory tests simulating Martian environments—including temperatures around -30 degrees Celsius and a pressure of 0.01 atmospheres—the material achieved an average compressive strength of approximately 12 megapascals and a flexural strength of 6 megapascals. The researchers also noted that the material maintained its mechanical performance even after being recycled four times.

While promising, the study notes that further research is required to address critical challenges such as radiation shielding, thermal insulation, airtightness for internal pressure, and the transition from small-scale models to full-scale autonomous construction.