Development of Alkali-Activated Binders from Recycling Regional Tuff and Marble Wastes

The sustainability goals of the developing world have led many industries to recycle their wastes and reduce emitting greenhouse gases. To contribute to these environmental responsibilities, this study has focused on the development of eco-friendly binder materials from regional ground tuff and marble wastes by the activation of Na2SiO3 and NaOH or slaked lime (Ca(OH)2). The results of the study show that alkali-activated composites tend to the expansion, drying shrinkage cracking, leaching and efflorescence. The compressive strength values of the NaOH and Ca(OH)2-activated pastes have reached up to 15 MPa and 9 MPa, respectively. A reduction in the NaOH molarity has improved the compressive strength, dimensional stability and durability of tuff-based alkali-activated pastes.