The Study of Various Superplasticizers' Influence on the Rheology of Clinker Minerals Water Suspensions

The article presents the direction of development of the scientific and practical foundations of the technology of cement concretes associated with the use of organic mineral additives. It allows to improve the physical and mechanical characteristics of products and structures. The purpose of research is determination of the mechanism of act organic-mineral additives including reductants of the various physical and chemical nature and an experimental estimation of their effect on a mineral phase structure and properties of cement system. Organic mineral additives are applied in studies for which new options of components of the various physical and chemical nature are observed and received. The study of possible mechanisms of effect organic mineral additives conducted on a water-cement paste and on concreting cement system with roent-gen-phase analysis application are made. The effect of organic mineral additives on properties watering out and concreting cement systems is established. The effect of organic mineral additives including reduct-ants of the various physical and chemical nature, on a modification of a mineral phase structure of growths in the course of a hydration solidification and set strength is determined. The data obtained allow to broaden the understanding of organic-mineral additives effect on a structure and properties of cement sys-tem and to suggest accessible raw reductants in new effective organic mineral additives for obtaining of cement concretes with improved physical-mechanical performances.

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Mechanisms of Act of Various Kinds of Organic Mineral Additives in Cement System

Ledenev

Козодаев

Percev

et al. 2021

Bulletin of Belgorod State Technological University Named After. V. G. Shukhov

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The Role of Surface Phenomena in Modified Cement Dispersions at Studying Poly-Functional Modifiers' Mechanism of Action

Kosukhin

2020

SSP

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The research findings of colloid and chemical properties of poly-functional modifiers (PFM) with various chemical compositions and qualitative and quantitative proportions of polar organic substances with various molecular weights have been presented. The possibility of regulating the properties of PFM and concrete mixes, modified by them by means of not only changing the chemical composition of modifiers, but combining the types and quantity of active admixtures of polar organic substances with various molecular weights has been shown. It has been demonstrated that the modifiers under study possess the surface activity at solid-solution phase boundary, reducing the surface tension σsolid-liquid (σs-l) At the same time the surface tension at the solution-air phase boundary can remain the same or reduce to a certain extent depending on the modifier’s chemical composition. PFM and superplasticizer (SP) SB-3, which have, unlike SP S-3, the certain surface activity at solid-solution boundary, increase the air entrainment into concrete mix by 0.5÷1.5%, additionally increasing the freeze-thaw resistance of concretes of both fluid and equal-workable compositions without affecting their strength. The adsorption of modifiers on the disperse phase of suspension is conditioned by dispersion forces and, independently of its kind, is of monomolecular nature. For the localization of PFM molecules on the surface of a particle, its molecule should have a system of bonded aromatic rings or conjugated double bonds. The adsorbed modifier’s molecules should make the disperse phase surface hydrophilic and for this purpose they should contain hydrophilic groups along the full length. All this predetermines the role of adsorption-solvation factor in modifiers’ mechanism of action.

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The Study of Various Superplasticizers' Influence on the Rheology of Clinker Minerals Water Suspensions

Cited by 2 publications

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Mechanisms of Act of Various Kinds of Organic Mineral Additives in Cement System

Mechanisms of Act of Various Kinds of Organic Mineral Additives in Cement System

The Role of Surface Phenomena in Modified Cement Dispersions at Studying Poly-Functional Modifiers' Mechanism of Action

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