Qatar’s first concrete 3D sculpture printed in few minutes

Tribune News Network Doha Qatar’s first 3D printed concrete structure is a local favourite – the Flag of Glory sculpture, a representation of diverse hands...

Tribune News NetworkDohaQatar’s first 3D printed concrete structure is a local favourite – the Flag of Glory sculpture, a representation of diverse hands united in holding up the flag of Qatar. It was printed in Qatar’s only facility for concrete 3D printing, established as a result of a partnership between Texas A&M University at Qatar (Tamuq), a Qatar Foundation partner university, Al-Jaber Trading and Contracting (JTC), and Cybe Construction. 3D printing has received increasing attention in the past decade, some industries found success in it early on, others like the construction industry struggled to catch up until very recently. Several 3D printed concrete structures are now popping up around the world. Qatar has recently joined this international movement with its first 3D printed concrete structure. “We choose to print this particular sculpture because of its significance to the country and the diversity it symbolises,” said Dr Eyad Masad, professor in the Mechanical Engineering Programme at Texas A&M University at Qatar (Tamuq), who was critical in bringing concrete 3D printing technology to Qatar. “From a technical aspect, this sculpture offers us the opportunity to showcase one of the biggest advantages of 3D printing which is flexibility in geometry. With a structure like this, conventional construction practices would require designing and making a mold first, 3D printing allows us to skip that step completely allowing considerable cost savings.”Engineer Mohammed Al Hamayda, JTC’s general manager, said: “Tamuq and JTC operators are now fully trained to 3D print any complex object using concrete locally. Our ultimate mutual goal is to participate effectively in developing green construction practices in line with Qatar National Vision 2030. “The possibilities with 3D printing are endless and we look forward to partnering with the public and private construction sector as well as academic institutions to deliver rapid and sustainable construction in Qatar.”3D concrete printing is an alternative construction method that has the potential to revolutionise the construction industry globally, with significant benefits such as reduced manpower; greater geometric freedom; reduced material consumption and wastage; improved safety on-site.The ultimate goal of the group is to use demolished waste from construction and recycle it back into the construction sector through 3D printing. This work is currently being conducted with funding support from QF’s Qatar National Research Fund (QNRF) and in partnership with QF’s Hamad Bin Khalifa University (HBKU), Al-Jaber Trading and Contracting, Ashgal, Seero Engineering and Hecettepe University in Turkey.On the research side of the technology, experts from Tamuq are looking into developing local materials for printing. “If you want to print structures in Qatar, you need to produce the printing material in Qatar. Shipping it is not a sustainable optional, neither economically nor environmentally,” said Dr Masad. A major material property to focus on for construction in a country like Qatar is thermal conductivity. The group is currently exploring printing with a light material that has low thermal conductivity so it can provide insulation and essentially create smart structures.As of now, no regulations exist in Qatar to get 3D printed buildings approved for residential or commercial use. Dr Masad noted that Tamuq and JTC have worked very hard for the past year and a half to adopt this technology in Qatar. The learning curve leading up to the deployment was a steep one, the team had to learn the design process, familiarise themselves with the printing material and its properties, understand how the printer operates and train personnel. He said, “We are pleased to say, we have successfully managed to integrate all this knowledge and are now confident in our ability to deliver 3D printed concrete structures for Qatar.”Standing at a height of almost three metres, the structure took only 30 minutes to print and required two personnel to monitor the printing and add the printing material. The same structure, if constructed using conventional methods, would have taken 12 to 18 hours and at least five people.Commenting on what the biggest challenge in concrete 3D printing is, Dr Masad said, “I would say it is figuring out how to get the printing concrete mixture through the machine as a fluid but also set quickly after it’s been deposited. If it sets too quickly, it will set in the machine and disrupt the printing process and if it doesn’t set quickly after deposition, it will continue flowing and won’t set in the shape we want it to. So, the biggest technical challenge is optimising the material to harden quickly while maintaining its structural properties.”The team has yet to reach a decision on where to place the printed sculpture. Dr Masad said, “All I can say for now is, it will be in a public space to ensure the entire community can view it and it will come soon so keep an eye out for it!”