Scientists Say They've Found a Way to Make Martian Concrete

Before people are ready live on Mars for an extended period of time, we first need to figure out where they’ll live. A group of researchers believe they’ve found a way to make building materials from components readily available on the red planet. 

In a recent paper, Lin Wan, Roman Wendner, and Gianluca Cusatis of Northwestern University reported their novel idea for creating a sort of Martian concrete out of local materials [PDF]. They developed their material from synthetic Martian soil, composed of silicon dioxide, aluminum oxide, iron oxide, and titanium dioxide—all known to be on the planet's surface—and molten sulfur. (Abundant on Mars, sulfur's use as a molten bonding agent goes back to ancient India, Greece, China, and Egypt, the authors noted.) Together, the ingredients form a concrete the team claims could be used to build an entire village.

Unlike traditional concrete, this new type of material doesn’t require water to make. Most of the limited water that’s located on Mars is frozen, so finding ways to build without it will be useful for any future human visitors. The material has the added benefit of being completely reusable, so it can be melted down and molded into a new structure whenever needed. Its composition also holds up against salt, acid, and extreme cold. 

Last year, NASA sent out a call for 3D printable designs of habitats that could be used during extended Mars missions. Most of these concepts also proposed taking advantage of the planet’s soil to create building materials, but this marks the first time such a plan has been presented in detail.  

[h/t: Dezeen

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Futuristic New Street Toilets Are Coming to San Francisco
SmithGroupJJR
SmithGroupJJR

San Francisco’s streets are getting shiny new additions: futuristic-looking public toilets. Co.Design reports that San Francisco’s Department of Public Works has chosen a new design for self-cleaning street toilets by the architectural firm SmithGroupJJR that will eventually replace the city’s current public toilets.

The design is a stark contrast to the current San Francisco toilet aesthetic, a green knockoff of Paris’s Sanisettes. (They’re made by the same company that pioneered the Parisian version, JCDecaux.) The tall, curvy silver pods, called AmeniTREES, are topped with green roof gardens designed to collect rainwater that can then be used to flush the toilets and clean the kiosks themselves. They come in several different variations, including a single or double bathroom unit, one with benches, a street kiosk that can be used for retail or information services, and a design that can be topped by a tree. The pavilions also have room for exterior advertising.

Renderings of the silver pod bathrooms from the side and the top
SmithGroupJJR

“The design blends sculpture with technology in a way that conceptually, and literally, reflects San Francisco’s unique neighborhoods,” the firm’s design principal, Bill Katz, explained in a press statement. “Together, the varied kiosks and public toilets design will also tell a sustainability story through water re-use and native landscapes.”

San Francisco has a major street-poop problem, in part due to its large homeless population. The city has the second biggest homeless population in the country, behind New York City, and data collected in 2017 shows that the city has around 7500 people living on its streets. Though the city started rolling out sidewalk commodes in 1996, it doesn’t have nearly enough public toilets to match demand. There are only 28 public toilets across the city right now, according to the San Francisco Chronicle.

These designs aren’t ready to go straight into construction first—the designers have to work with JCDeaux, which installs the city’s toilets, to adapt them “to the realities of construction and maintenance,” as the Chronicle puts it. Then, those plans will have to be submitted to the city’s arts commission and historic preservation commission before they can be installed.

[h/t Co.Design]

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Dutch City Will Become the World's First to Build Inhabitable 3D-Printed Concrete Houses
Houben and Van Mierlo Architecten
Houben and Van Mierlo Architecten

A new 3D-printed concrete housing development is coming to the Netherlands in 2019, CNN reports. The structures will be the first habitable 3D-printed concrete houses in the world, according to Project Milestone, the organization behind the initiative.

While architects and engineers have been experimenting with 3D-printed buildings for several years, most of those structures have just been prototypes. The Dutch development, located in Eindhoven, is expected to be ready for its first residents by mid-2019.

Project Milestone is a collaboration between the city of Eindhoven, Eindhoven University of Technology, the contractor Van Wijnen, the real estate company Vesteda—which will own and manage the houses—the engineering consultancy Witteveen+Bos, and the construction materials company Weber Beamix.

A rendering of boulder-like homes in the middle of a field
Houben and Van Mierlo Architecten

The five planned homes will be built one by one, giving the architects and engineers time to adjust their process as needed. The development is expected to be completed over the next five years.

The housing development won’t look like your average residential neighborhood: The futuristic houses resemble massive boulders with windows in them. The first house, scheduled for completion in 2019, will be a 1022-square-foot, three-room home. It will be a single-story house, though all the rest of the homes will have multiple stories. The first house will be built using the concrete printer on the Eindhoven University of Technology’s campus, but eventually the researchers hope to move the whole fabrication process on-site.

In the next few years, 3D-printed houses will likely become more commonplace. A 3D-printed home in Tennessee is expected to break ground sometime later in 2018. One nonprofit is currently trying to raise money to build a development of 100 3D-printed houses in El Salvador within the next two years. And there is already a 3D-printed office building open in Dubai.

In Eindhoven, residents appear to be fairly eager for the development to open. Twenty families have already applied to live in the first home.

You can learn more about the construction process in the video below.

[h/t CNN]

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