The concrete revolution continues – printing the World’s largest real concrete 3D printed building

Muscat, Oman

German University of Technology in Oman (GUtech) is the result of a collaborative agreement between RWTH Aachen University and OES Company (Oman Educational Services) which was agreed in December 2006. The main goal behind GUtech is to become a leading university in the region, achieving internationally recognized standards in education, research, and innovation. GUtech mission is to provide a diverse student body with the education required to become highly qualified and socially responsible graduates, guided by German excellence in science and technology and with a firm grounding in Oman’s culture and heritage. The University fosters creative and critical thinking to advance research and innovation and, through this, aims at serving society as a whole.

GUtech on December 14, 2021, celebrated the finishing of the 3D printing of the walls of the so far largest 3D printed building in the world made with a real concrete. The house consists of 190 m2 (2,100 SF) and is typical for a social housing unit in Oman. It has 3 bedrooms, three bathrooms, a living room, kitchen, and guest reception area. The house was printed in two stages. While the materials recipe was adjusted and training of the Omani crew took place during the printing of the first part of the house, the second part of the house was done by the Omani crew on their own and it only took five days to complete. A sign of fast learning and productivity improvements occurring in 3D printed projects.

The World’s largest 3D printed real concrete building was printed with the low cost D.fab concrete solution developed in cooperation between CEMEX and COBOD. In the case of Oman, more than 99.5% of the materials used were local, with less than 0.5% coming from Europe in the form of the D.fab additives. In Oman the cost of materials for 3D printing of the walls of the 190 m2 (2.100 SF) house was less than 1,600 Euro. According to COBOD, if a printable dry mix mortar had been used the cost of the materials would be more than 20,000 Euro, and it was such significant cost reductions which COBOD and CEMEX was aiming for with their cooperation.