Abstract
This paper deals with the composition and properties of solid solution of calcium sulfoferrite. It was studied an influence of calcium s sulfoferrite on structure and properties cement phases. Study of the hydration processes of the calcium sulfoferrite mineral are observed only short prismatic crystals. Prismatic crystals of ferruginous ettringite are always formed from sulfoferrite mineral of any fraction. it was found that the smaller the initial hydrating grains of minerals, the faster they are hydrated. Analyse polyfractional compound hydration showed that fine fractions provide formation of crystallization centres, and particles less than 45 microns, with constant interaction with the liquid phase, cause a gradual growth of crystals. Expansion of hydrated minerals of certain fractions was analysed to check the dependence of the expansion on the morphology of ettringite crystal hydrates. During the hardening of the samples, expansion was observed along with a drop in strength.
Highlights
Hydration and hardening of Portland cement are accompanied by generating of crystalline and gel-like products, which, together with non-hydrated grains, participate in formation of the three-dimensional framework of the cement stone[1,2,3].Depending on activity of the original mineral, the crystalline hydrates are formed sequentially or simultaneously, while they filling the free space in the cement stone
Supersaturation of the liquid phase depends on dispersion of the hydrating component, and the dispersion, in turn, affects morphology and amount of formed hydrates and is the driving force behind formation and growth of crystals formed from the solution
The results of the research of the sulfoferrite mineral proved that the smaller the initial hydrating grains of minerals, the faster they are hydrated
Summary
Hydration and hardening of Portland cement are accompanied by generating of crystalline and gel-like products, which, together with non-hydrated grains, participate in formation of the three-dimensional framework of the cement stone[1,2,3].Depending on activity of the original mineral, the crystalline hydrates are formed sequentially or simultaneously, while they filling the free space in the cement stone. Hydration and hardening of Portland cement are accompanied by generating of crystalline and gel-like products, which, together with non-hydrated grains, participate in formation of the three-dimensional framework of the cement stone[1,2,3]. The crystalline hydrates bind to the cement stone framework by accretion, and gel-like hydration products compact it. Various studies have shown that concentration of the liquid phase reaches a certain limiting value, at which the primary nuclei of new phases appear resulted from dissolution of minerals. Supersaturation of the liquid phase depends on dispersion of the hydrating component, and the dispersion, in turn, affects morphology and amount of formed hydrates and is the driving force behind formation and growth of crystals formed from the solution Probability of nucleation from supersaturated solutions and rate of formation of crystallization centres proportional to it in solution volume unit per time unit are directly proportional to the degree of supersaturation of the solution with respect to the new phase.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
