Cement used in concrete production is a huge source of carbon dioxide emissions, so the more people recycle existing concrete, the better, foreign media reported.That's where a new study comes in, showing that when waste wood is added to waste concrete, it's even stronger than before.

It is understood that concrete is made of aggregates such as gravel mixed with water and cement.Once the water dries out in the mixture, the cement hardens and combines with the aggregate to form a solid mass.

Now, a team led by Yuya Sakai, an assistant professor at the university of Tokyo in Japan, ground the concrete into a powder and added water and lignin from waste wood.Lignin is a highly cross-linked organic polymer that is a key component of the supporting tissue of vascularized plants -- it gives wood its rigidity.

They then heated the mixture simultaneously and placed it under high pressure.It was found that by precisely adjusting the variables of concrete/lignin ratio, water content, temperature, and the amount and duration of pressure, lignin can form an effective adhesive to bond the concrete powder together.

In subsequent tests, the recycled concrete was found to have higher flexural strength than the original concrete.As an added advantage, thanks to its lignin content, the material may be biodegradable after being discarded.

What's more, scientists believe that lignin can be obtained from other plants, such as agricultural waste, and that it may even eventually be possible to create new "raw" concrete - lignin instead of cement.

"These findings could lead to a greener, more economical construction industry that not only reduces waste concrete and wood storage, but also helps address climate change," Sakai said.

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