The Moon offers significant advantages as a forward base for space exploration due to its abundant in-situ resources, low gravity, and close proximity to Earth. In recent years, various countries have initiated extensive research not only on lunar science but also on the development of technologies for constructing lunar bases. Multiple materials such as sulfur concrete, geopolymers, polymers, and cement-based concrete have been proposed for lunar construction, each with its own strengths and limitations that have been reported in the literature.

In this study, we aim to develop a novel type of lunar concrete that differs from previously proposed materials by using calcium oxide (CaO)—a substance expected to be readily available in the lunar environment—as an activator. This approach focuses on enabling the solidification of lunar concrete under ambient conditions without the need for external heating. Furthermore, recognizing the extreme and hazardous nature of the lunar environment, where human involvement in on-site construction is highly limited, this research also explores the application of 3D printing construction (3DPC) technology as a means of automated building. To improve the buildability and structural integrity of the 3D printable lunar concrete, we are concurrently investigating the incorporation of blast fibers, which are known to be present in lunar regolith, as a reinforcement material. Through this approach, we aim to advance the development of practical and sustainable lunar construction technologies based on local resource utilization.