Valorization of ash from landfill in blended cements and hybrid alkaline cements

The use of fly ash from coal-fired power plants as SCMs is widely known. The fight against climate change requires the closure of many coal-fired power plants, which may mean that this material may become scarce in the near future. However, ash landfills may be an important source of SCMs in the future. This work analyzes the use of landfill ash treated mechanically and chemically to increase its reactivity (AVR) in the production of blended cements (70% cement/30% AVR) and hybrid alkaline cements (30% cement + 70% AVR). The mortar mechanical strength and hydration kinetics were determined by isothermal conduction calorimetry. The hydration products were characterized by XRD.