The Effect of Forced Carbonation on the Change in the Structure of Lime-Containing Systems over Time

Abstract

The paper presents the results of experimental research on establishing the possibility of using furnace gasses and sodium manufacturing waste as low-activity lime dust in the solid building materials manufacturing technology. Research on the changes of physical and mechanical properties and structure of the material based on lime-calcareous compositions that solidify in the environment with increased carbon dioxide concentration after being stored in the natural environment for 24 months were conducted. Material samples constitute semidry-pressed cylinders (compacting pressure – 30 MPa), made of a mixture of low-activity lime dust and a filler, which is waste material from extraction of limestone of Crimean deposit. Conducted research of physical and mechanical properties, of structure and characteristics of material’s porosity had shown that an increase of samples’ strength could be observed both as a result of portlandite changing into calcite upon forced carbonation, as well as a result of repeated crystallization of scalenohedral calcite into rhombohedral shape after storing samples in the natural environment.