Open AccessUpcycling of cementitious wastes in one-part alkaline cement binders
Author(s) -
M.H. Samarakoon,
P.G. Ranjith
Publication year - 2021
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/1196/1/012002
Subject(s) - cementitious , portland cement , materials science , fly ash , cement , sodium silicate , curing (chemistry) , ground granulated blast furnace slag , compressive strength , sodium hydroxide , waste management , metakaolin , calcium silicate hydrate , geopolymer , composite material , chemical engineering , engineering
Cementitious wastes generate at an increasing rate and are generally disposed of in landfills, creating harmful environmental impacts. Therefore, enhancing potential pathways to recycle such wastes is critical. In this study, two ways of introducing cementitious wastes in one-part alkaline cement binders (ACBs) are presented: as solid precursors and as activators. A mixture of fly ash and blast furnace slag as the solid precursors and a blend of thermally treated sodium hydroxide and waste glass as the alkali activator were used to cast ACBs by just adding water similar to ordinary Portland cement. Glass powder-based activator showed 70% of efficiency in creating crystalline sodium silicate which dissolves in the binder phase to enhance the production of hydration products. Reasonable compressive strengths of the hardened paste were reported resulting in a dense microstructure with the curing age. Therefore, in this study, the increasing involvement of cementitious wastes in one-part ACBs is confirmed.