Scientists have recently developed a method to 3D-print greener buildings using local soil that they say has the potential to revolutionise the construction industry.
Sarbajit Banerjee, a professor of chemistry and materials science and engineering at Texas A&M University, said 3D printing enabled a versatility that allowed them to print entire architectural facades, although getting such structures to meet existing building regulations remained a significant challenge.
Concrete remains the primary material used in many construction projects but it cannot be recycled and requires a lot of energy to mix and transport. The research team's aim is to print structures using the type of soil that can be found in any garden.
"While the widespread use of concrete has widespread access to housing and enabled the growth of cities, this has come at a considerable environmental cost," said Banerjee.
"The move to 3D-print concrete threatens to exacerbate this problem. However, we envision a new example of construction that uses naturally sourced materials. Using such materials will further pave the way for building designs that are specifically adapted to the needs of the local climate.
What's more, the use of local materials would reduce the need to transport concrete long distances, further reducing the environmental impact of the buildings.
The research team's plan to replace concrete with the earth beneath our feet depends on their ability to improve the soil's capability to stand the weight of the whole house, to which Banerjee said they "are making excellent progress".
Once they have a clearer idea of the limits of the technology, Banerjee and his team plan to further investigate how it might allow for building on other planets. For instance, they have worked on addressing the problem of building all-weather roads in the subarctic. They hope the technology could one day be used beyond Earth, to create settlements on the moon or even Mars.
