Utilization of calcite and waste glass for preparing construction materials with a low environmental load

In this study, porous calcite materials are hydrothermally treated at 200 °C using powder compacts consisting of calcite and glasses composed of silica-rich soda-lime. After treatment, the glasses are converted into calcium aluminosilicate hydrates, such as zeolite phases, which increase their strength. The porosity and morphology of new deposits of hydrothermally solidified materials depend up on the chemical composition of glass. The use of calcite and glass in the hydrothermal treatment plays an important role in the solidification of calcite without thermal decomposition.

► Calcite solidification by a hydrothermal treatment using calcite and silica glasses. ► Transformation of the glass into calcium aluminosilicate hydrates. ► Chemical composition of the glass influence on the morphology of the deposits. ► Method for the solidification of calcite without CO2 gas emissions.