Alkali-activated materials: cementing a sustainable future

Abstract

This paper presents an overview examining the microstructural and macrostructural properties of alkali-activated binders based on granulated blast furnace slags, metakaolin and their blends, developed by the Composite Materials Group  of  Universidad  del  Valle  over  the  past  decade.  Durability  results  of  activated  binders  when  exposed  to  aggressive agents such as chlorides, and carbon dioxide are reported. The results of this research have elucidated the  great  feasibility  of  adopting  alkali-activation  technology  in  Colombia  for  producing  high  strength  concretes  based on industrial by-products, with a wide range of properties that can be suitable for different civil infrastructure applications,  and  contribute  to  the  valorization  of  low-cost  industrial  by  products  through  production  of  more  environmentally  friendly  building  materials.  Our  research  highlights  the  fact  that  a  deep  understanding  of  the  chemistry of these systems allows the manipulation of the microstructure and therefore the performance of the final products, toward the production of sustainable and versatile materials.