Three Indian Institute of Technology (IIT-Guwahati) researchers have created third-dimensional (3D) printed urban furniture from of construction materials derived from local industrial trash.

Dhrutiman Dey, Dodda Srinivas, and Bhavesh Chaudhari from the institute’s Sustainable Resources for Additive Manufacturing (SReAM) group created new cementitious mix compositions suitable for 3-D printing.

This concrete printer, developed in collaboration with IIT-G and Deltasys E Forming, consists of – industrial wastes as binders to build 3D printed furniture with a seating height of 0.4 m, a width of 0.4 m, and arch-shaped support that was modelled and sliced using SolidWorks and Simplify 3D, respectively.

According to a news release from the institute, the improved designs are printed with 75% less concrete and without the use of a mould. This entire unit was printed layer by layer at a pace of 80 mm/s, with each layer having a height of 10 mm. After printing, the unit was covered in damp gunny bags for 7 days to cure before being used.

“We showcased how material-efficient structures can be produced in our lab-scale 3D printer. Our goal is to design high-performance concrete mixes made from industrial wastes for the printing such complex structures,” – asserted Dr. Biranchi Panda, Department of Mechanical Engineering, IIT Guwahati.

This three-person team is now investigating underwater concrete printing as well as the prospect of printing functional reinforced concrete using low-carbon ingredients.

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