Abstract
The ever-growing number of demolition materials that are landfilled has initiated several global incentives for reusing these wastes in industrial applications. Chemical stabilization is widely practiced for improving the mechanical properties of recycled aggregates. Although sodium silicate is the most popular alkali cation that has been extensively studied for stabilization and concrete production, the relatively high viscosity of the solution can be an obstacle to its usage in industrial applications. The second efficient alternative cation dissolution inducer that has been investigated for activation of low-calcium alkali activated systems is potassium. This research has evaluated the impacts of the higher enthalpy of potassium hydroxide and the overall lower viscosity of potassium dissolution for activation of low-calcium fly ash in order to stabilize demolition aggregates. Additionally, the impact of ground-granulated blast-furnace slag (GGBFS) on short-term strength improvement was also demonstrated. The resilient behavior of the stabilized demolition waste samples under repeated loading further indicates the viability of using stabilized demolition wastes for road base and subbase construction.
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