SCIENCE - Seeding a new kind of concrete

Sunflower seed husks, a huge waste product of the vegetable oil and food industry, could be used as an environmentally friendly filler, or aggregate, for concrete according to Turkish researchers. The team demonstrated that the use of husks reduces the density of concrete as well as boosting the material's resistance to cracking after exposure to icy then thawing conditions.

http://www.sciencedaily.com/releases/2013/04/130425132528.ht