The study investigates the effect of sludge waste from mining and washing of limestone on the properties of geopolymer binders based on metakaolin and blast furnace slag. The effect of adding two types of limestone sludge on workability, setting time, compressive strengths, durability and pore distribution was investigated. Limestone sludge was dosed in an amount of 0–30 %. Sodium water glass was used as an alkaline activator in the ratio of 5:4. A linear correlation between the flowability and limestone sludge content was observed, and very satisfactory results of compressive strength after 90 days were obtained for samples with sodium water glass (about 55 MPa). The positive effect of CaCO3 on strength was confirmed. The increased content of clay components resulted in a reduction of compressive strength.

The study investigates the properties of alkali-activated binders with waste glass (WG) under hydrothermal treatment. WG was dosed in 0-30 wt.% and was used as a substitute for raw materials. Solid precursors were mixed with sodium water glass. The prepared specimens were cured in ambient conditions (20°C and RH 98%) and hydrothermal conditions (105°C and 150°C). The effect of glass and hydrothermal treatment on physical and mechanical properties after 2, 7, 28, 56, 90 and 180 days was monitored. Prepared hybrid zeolite-geopolymer materials were characterised by X-ray diffraction analysis, SEM, and MIP. It was confirmed that replacing raw materials with glass up to 20 wt.% did not deteriorate long-term properties under ambient conditions. The positive effect of hydrothermal curing was manifested, especially at a temperature of 150°C, when 20 wt.% glass was used.