Scientists at the Kaunas University of Technology (KTU) in Lithuania are developing ways to produce concrete using industrial waste instead of cement, thereby reducing the amount of carbon dioxide released into the atmosphere during the production of cement. According to a report by the university, it is as strong as traditional concrete, but is more resilient when it comes to the damaging effects of acid, and more stable when exposed to extreme heat and cold.
“At first, the idea that concrete can be produced without using cement seemed radical,” said Vytautas Bocullo, researcher at KTU Faculty of Civil Engineering and Architecture, according to the university. “Now, after several years of intensive work, we succeeded to develop alkali-activated concrete, which compressive strength is 55 MPa (the same as in usual concrete). Instead of Portland cement, we are using alkali activated industrial waste products — fly ash, biofuel bottom ash, AlF3 production waste — silicagel etc.”