Intensive Ways of Producing Carbonate Curing Building Materials Based on Lime Secondary Raw Materials

• Main Authors: Nikolai Lyubomirskiy, Aleksandr Bakhtin, Stanisław Fic, Małgorzata Szafraniec, Tamara Bakhtinа
• Format: Article
• Language: English
• Published: MDPI AG 2020-05-01
• Series: Materials
• Subjects: forced carbonate hardening; secondary raw materials; soda production wastes; lime dust; Ca(OH)₂; CaCO₃
• Online Access: https://www.mdpi.com/1996-1944/13/10/2304

The article is dedicated to the research and development of intensive methods for curing products by capturing and binding CO₂. It aims to improve and increase the productivity of technologies for the production of artificially carbonated building materials and products. Soda production wastes, limestone dust and finely dispersed limestone dust were used as the research objects. Secondary raw materials have been investigated using modern methods of phase composition and granulometry test. Intensive methods of production of accelerated carbonation of systems consisting of soda wastes were tested using multi-parameter optimization methods. The effects of recycled lime materials on the strength and hydrophysical properties of the obtained material were determined. The secondary raw materials effect depended on the composition of the raw mixture, molding conditions, CO₂ concentration applied to the carbonate curing chamber, and the duration of exposure to environments with high CO₂ content. It was found that the most effective way of providing accelerated carbonation curing of construction materials and products is a combined carbonation method, combining the principles of dynamic and static methods. It was concluded that the optimal CO₂ concentration in the gas-air mixtures used for carbonate curing is 30%–40%.