Geopolymers Based on Aluminosilicate Raw Materials

The vision of a sustainable world economy is currently aimed at achieving carbon neutrality and linked to global warming. According to statistics, simply burning one ton of Portland cement clinker causes at least a half a ton of carbon dioxide to be emitted. Therefore, one of the options to solve the problems identified is to revise existing technologies and develop low-carbon, low-carbon binders using industrial waste and unconditioned raw materials. Modification of the system «aluminosilicate raw material - alkaline activator» with sodium tetrabydrate and a fine-dispersed additive of volcanic nature, improves the properties of the cement clay, compacts the structure, reduces the porosity of the stone, which in the end positively affects the activity of the binder. The samples prepared were subjected to electron diffraction studies, as well as X-ray phase analysis of the zone (RFA) on the ARLX'TRA diffractometer. The properties of the binder and cement test have been investigated in accordance with the regulatory documents GOST 310.3-76 Cements. Methods for determining normal density, latch times and uniformity of volume change; GOST 310.4-81 Cements. Methods to determine the strength of bending and compression.. The studies revealed a dependence of influence of chemical modifier on structure and properties of cement stone. When modifying the dehydrated system with tetrabran sodium in dosages of 0.35 - 0.45% of the alkali activator mass, the structure is compacted, the porosity of the stone is reduced, which positively affects the activity of the binding material. The positive concept of filling a binder with a more dispersed volcanic additive in a quantity of 10% containing an aluminosilicate phase has been established. The properties of the cement dough improved, the need for alkali solution decreased by 8-10%, the adhesion times did not increase significantly but increased by 10-40 minutes depending on the active component, water absorption in mass decreased by 5% and strength increased by 10- 12%. Study of microstructure of samples showed that the main mass of heterogeneous systems are volumetric aggregates and lattices, small clusters on their surfaces with pronounced spiciness; features of microstructure indicate mineralization processes.. Therefore, the development of low-carbon construction models will contribute to and open an effective path for climate policy implementation through the rational use of natural resources, the inclusion in the production of industrial wastes and environmental-like technologies.

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