Video: UC Berkeley team unveils “Bloom” 3D-printed cement structure

A UC Berkeley research team led by Ronald Rael, associate professor of architecture, has unveiled the first and largest powder-based 3-D-printed cement structure built to date.

The debut of this groundbreaking project is a demonstration of the architectural potential of 3-D printing.

The freestanding pavilion, “Bloom,” is 9 feet high and has a footprint that measures about 12 feet by 12 feet. It is composed of 840 customized blocks that were 3-D-printed using a new type of iron oxide-free Portland cement polymer formulation developed by Rael.

Bloom is a precise 3-D-printed cement polymer structure that overcomes many of the previous limitations to 3-D-printed architecture. Such limitations include the speed and cost of production as well as aesthetics and practical applications.

Rael designed and led the year-long research project with funding and collaborative support from the Siam Research and Innovation, the research and development division of Siam Cement Group.

Siam Cement Group provided the Portland cement. Additional support and materials were provided by Emerging Objects, a startup company co-founded by Rael and Virginia San Fratello, and Entropy Resins.

Rael’s team consists of four CED graduate students: Kent Wilson, Alex Schofield, Sofia Anastassiou and Yina Dong.

Fabricated using 11 3D Systems printers located in the CED printFARM (print Facility for Architecture, Research and Materials, and at Emerging Objects, each enumerated brick is unique, with a variegated pattern that allows for varying amounts of light to pass through. Assembled, the bricks create an overall decorative pattern reminiscent of traditional Thai floral motifs along the structure’s undulating wall.

“While there are a handful of people currently experimenting with printing 3-D architecture, only a few are looking at 3-D printing with cement-based materials, and all are extruding wet cement through a nozzle to produce rough panels,” Rael said. “We are mixing polymers with cement and fibers to produce very strong, lightweight, high-resolution parts on readily available equipment; it’s a very precise, yet frugal technique. This project is the genesis of a realistic, marketable process with the potential to transform the way we think about building a structure.”

After its debut last week, the architecture will be disassembled and shipped to Siam Cement Group in Thailand, where it will be exhibited and remain on display for several months before traveling to various locations around the world.

“Our goal at SRI has always been to help advance cement-technology innovation,” said Siam Cement Group managing director Sanit Kessuwan, top management of SCG. “Our collaboration with Ronald Rael and the College of Environmental Design at UC Berkeley has allowed us the rare opportunity to work with one of the premier environmental design centers in the world to help them innovate our materials to create a new paradigm in building.”

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