WASTE BLAST-FURNACE SLAG AS A RESOURCE FOR THE PRODUCTION OF SLAG-ALKALINE BINDERS
DOI:
https://doi.org/10.15421/jchemtech.v31i3.279211Keywords:
waste blast-furnace slags;, slag fractions;, slag-alkaline binders;, mineralogical composition;, hardening;, strength.Abstract
The relevance of the work is related to the solution of environmental problems while reducing the use of natural resources, CO2 emissions in the production of cement and the search for ways to create alternative binders with specific properties, one of which is slag-alkali binders (SAB). The aim of the work was to solve the problem of resource saving by identifying the useful technical properties of waste blast-furnace slags and justifying their disposal as SAB. Waste blast-furnace slags of Public Joint-Stock Company (PJSC) Dneprovskiy Metallurgical Plant, the PJSC Zaporizhstal, the Private Joint-Stock Company Mariupol Metallurgical Plant, the PJSC Alchevsk Iron and Steel Works and waste and granulated blast-furnace slag of PJSC ArcelorMittal Kryvyi Rig were studied. The slags were dispersed to a specific surface area of 2700–4950 cm2/g. For mixing, water and 20 % NaOH solution were used. The determination of the consistency of the binding paste was carried out by the method of spreading a standard cone on a vibrating table. The strength of the SAB samples was determined on a P-5 press. The mineralogical composition of the SAB was determined by X-ray phase analysis performed on a Siemens D500 powder diffractometer. Slag fractions were selected that meet the criteria for practical utilization: the ratio of oxides of the main elements, compliance with the requirements of the modular classification and the values of the quality and saturation coefficients. The interaction of slag minerals with mixing agents is confirmed by a change in the mineralogical composition of the SAB compared to the initial composition of slags. New formations are represented by Ca and Mg aluminosilicates, carbonate compounds and sodium-containing phases, which are the products of hydration hardening. The different nature of the SAB hardening products indicates the simultaneous implementation of the contact-condensation and hydration mechanisms of the process. In terms of mineralogical composition, SABs based on waste blast-furnace slags occupy an intermediate position between clinker cements and SABs based on granulated blast-furnace slags. Special properties of SAB are predicted: the duration of strength increase in time; compaction and strengthening of the structure as a result of the formation of carbonate phases; resistance to sulfate corrosion; heat resistance, which opens up the prospect of obtaining targeted concretes based on SAB using various slags.
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