It seems as though alkali-activated cements are suddenly all the rage. Last week, we shared an article on a company in Pennsylvania pushing an alkali-activated cement using slag and soda ash. The latest article that we have looked at relating to new cement material relates to the use of lime with two waste streams to form a geopolymer.
The article shares news from a recent paper published between researchers from an Australian university and Alcoa. The researchers focused on flyash found primarily in ash ponds, as well as the Bayer-liquor waste streams from alumina refineries. By combining the two streams, the mixture creates a geopolymer that can either be cured at high temperature in an oven, or at ambient conditions in combination with lime.