Professor Jishen Chu is from the Civil and Environmental Engineering Department at the Hong Kong University of Science and Technology.

Basically, the idea is simple.

We're going to make a concrete.

99% of the concrete is made of sand, stones that you can get from the site.

That's not actually a very new idea.

So what is new is about the glue, or we call it the binder.

So the binder we are using or we're developing is made of two things.

How do you then create this? How do you mix this together so it can actually be 3D printed into a structure?