Singapore’s transportation officials are set to debut the use of 3D-printed concrete in the form of a new pedestrian bridge that will stretch 30 feet across a waterway.
Brought onboard a larger project to improve transit options in the Jurong River and Temah areas of the city state, it’s the country’s first use of 3D printing for this kind of infrastructure.
The project, managed by the Land Transit Authority (LTA) has just completed a testing phase where segments of printed concrete, made up of cement, sand, and water, were subjected to stress tests under the weight of large water tanks weighing 1 metric ton each.
The first printed segments formed a scale model of what will be the eventual bridge. 10 segments in total took about 40 hours to finish compared to two weeks that might have been expected with manual concrete laying.
It cost a mere $1.4 million to develop and supply the specialized 3D-printing mixture, and the whole project was carried out by Singapore Center for 3D Printing at Nanyang Technological University, with help from the engineering consultancy Witteveen+Bos and 3D concrete printing construction firm CES_Innovfab.
The real thing is slated for completion in 2028, when each of the 10 segments will be threaded together on robust steel cables until it measures 30 feet long and 15 feet wide.
3D-printed bridges have also been installed in China and the Netherlands. The longest in the world is in the Dutch city of Nijmegen, where it stretches 95 feet (29 meters) across a canal.
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The bridge is striking to look at, with sculpted conical feet that gives it a shape a little like that of a caterpillar.
In Singapore, it’s very much early days for the technology, and the load-bearing tests carried out on the scale model will inform any future applications of the technology. It’s hoped they will be successful, as labor shortages are affecting LTA’s ability to conduct similar projects at scale.
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3D-printed homes present as a much easier engineering challenge since the structure is built from the ground up. Printing each bridge segment—set for a life of foundationless suspension, required a precise mixture of ingredients, printing flow rate, and printing speed to ensure each layer fell, filled, and dried in a perfectly even pattern to ensure no cracks would develop as the mixture hardened.
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