Utilisation of heat-treated ornamental stone processing waste as an addition to concretes to improve compressive strength and reduce chloride ion penetration

In the present study, the ornamental stone processing waste was heat treated at 1200 °C, with the goal of converting it into a pozzolan. At first, the treated waste characterisation was performed in order to assess its physical and chemical characteristics along with its pozzolanic activity. Then, concretes with 5% and 10% waste content were produced, and their compressive strength and chloride penetration resistance were evaluated. The heat-treated waste presented pozzolanic activity, and its addition into concrete mixtures provided an increase in compressive strength and reduction in chloride ion penetration; mainly in the mixtures with 10% addition.