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%.

The results of experimental studies to determine the possibility of organizing the carbonate hardening of the dolomitic binder resulting from calcination of dolomite are presented. The optimum temperature of calcination of this type of raw material for obtaining a dolomitic binder with a high reactivity is established. The physicomechanical characteristics of the test samples that have been hardening in the medium ofhigh carbon dioxide concentration are determined. A forecast regarding the possibility of applying the results obtained in the production of building materials and carbonization hardening productsis made.

Alternative binders activated by forced carbonisation are regarded as one of the potential solutions to reducing greenhouse gas emissions, water, and energy consumption. Such binders, in particular those based on nepheline sludge (a by-product of alumina production), cured in carbon dioxide with subsequent hydration, are clinkerless building materials. The development of such binders contributes to the involvement of multi-tonnage solid industrial waste in the production cycle. This type of waste is capable of binding man-made CO₂ and transforming it into stable insoluble compounds, having binder properties. The optimum technological parameters of the forced carbonisation of the nepheline slime binder was determined by the mathematical planning of the experiment. The novelty of the research is the expansion of the secondary raw material base that can bind the man-made CO₂ with obtaining the construction products of appropriate quality. It was revealed that the process of active CO₂ absorption by the minerals of nepheline slime is observed in the first 120 min of the forced carbonization. Immediately after carbonisation, the resulting material develops compressive strength up to 57.64 MPa, and at the subsequent hydration within 28 days this figure increases to 68.71 MPa. Calcium carbonate is the main binder that determines the high mechanical properties of the samples. During the subsequent hydration of the uncoated belite, gel-like products are formed, which additionally harden the carbonised matrix. Thus, after the forced carbonisation and the following 28 days of hardening, the material with compressive strength in the range 4.38–68.71 MPa and flexural strength of 3.1–8.9 MPa was obtained. This material was characterised by water absorption by mass in the range of 13.9–23.3% and the average density of 1640–1886 kg/m³. The softening coefficient of the material was 0.51–0.99. The results obtained enables one to consider further prospects for research in this area, in terms of the introduction of additional technological parameters to study the process of forced carbonisation of nepheline slime.

The results of theoretical and experimental studies to determine the possibility of sequestration of carbon dioxide in building materials based on nepheline slime are presented. The main principles of the technology for the utilization of CO 2 in the building materials and products industry are presented, in particular, on the basis of nepheline slimes produced during the production of alumina from nepheline ores. Using the method of thermal analysis, the efficiency of carbonization of prototypes in a medium of increased concentration of carbon dioxide was proved. Optimization of technological parameters for the production of carbonized samples based on nepheline slime was carried out using the methods of optimal experiment planning. The equations of regression of strength, density, water resistance and water absorption of prototypes are obtained depending on the main technological factors. Optimal technological parameters for the production of a carbonized material with the necessary properties were established. The physicomechanical characteristics of the prototypes hardened in a medium with a high concentration of carbon dioxide are determined. A forecast is made regarding the possibility of applying the results obtained in the production of building materials and carbonization hardening products based on nepheline slime.

This article explores the possibility of using metallurgical waste slags formed during the smelting of cast iron and steel as cementless binders that harden due to forced carbonization and the subsequent hydration processes of some minerals that form the basis of these slags. This study presents the results of multi-objective optimization using statistical methods of mathematical experimental design, with the purpose of obtaining a carbonized material with good mechanical and physical properties. As a result of the research, carbonized stone with compressive strength up to 116.5 MPa was obtained. Water absorption by weight is within the range of 6.0–17.0%, and quantitative CO₂ binding was 6–11.9%, depending on the type of slag. A pilot batch of wall product samples (hollow bricks and paving elements of various territories) was manufactured under production conditions. During the tests, we found that the compressive strengths of products based on BOF and EAF slags were 96.3 and 81.1 MPa, respectively, and that of bricks based on BS slag was 37.1 MPa. A comprehensive analysis of the performance properties of products from the pilot batch showed that these samples meet the requirements of national standards.