Colloid-Chemical Bases on Creation of Multifunctional Modifiers of Concrete Mix and Concrete

Kosukhin, Mikhail; Shapovalov, N. A.; Kosukhin, Andrey

doi:10.4028/www.scientific.net/ssp.265.331

Cited by 7 publications

(7 citation statements)

References 6 publications

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“…It follows thence, that the reduction of the yield value to the minimum at optimal admixture dosages is conditioned with the decrease of individual contact strength to values, comparable with thermal motion energy [17,18].…”

Section: The Main Partmentioning

confidence: 98%

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A Mechanism of Action of a Polyfunctional Modifier Made of Hydrocarbons Production Waste in Mineral Suspensions Based on Fine-Ground Cements

Kosukhin

2018

SSP

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The findings of the research of colloid and chemical properties of mineral suspensions, based on fine-ground cements and modified with the new polyfunctional modifier, obtained from hydrocarbons production waste, have been presented. It has been demonstrated that the introduction of modifier allows influencing the adsorption processes, electrokinetic potential, rheological parameters, aggregative and sedimentation stability of minerals suspensions, as well as purposefully regulating their properties and considerably cutting the consumption of Portland cement clinker by replacing it with mineral admixtures. The comparative analysis of the obtained modifier with the known analogues has been carried out. On the basis of the carried-out experimental research and the literature data the key points concerning the required properties of modifiers have been formulated. This allows determining their mechanism of action and demonstrates that it is conditioned by the combined action of adsorption-solvation and electrostatic factors. The exclusion of one of these factors results in the loss of the modifier’s activity.

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Section: The Main Partmentioning

confidence: 98%

“…The equilibrium of coagulation and peptization processes is determined with the ratio of coagulation contact energy U к and the particles heat motion energy. The adsorption of admixture on the particles surface changes the U к value and shifts the coagulation↔peptization equilibrium to this or that direction [19].…”

Section: The Main Partmentioning

confidence: 99%

A Mechanism of Action of a Polyfunctional Modifier Made of Hydrocarbons Production Waste in Mineral Suspensions Based on Fine-Ground Cements

Kosukhin

2018

SSP

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“…The development of technology and practical application of the up-to-date concrete is based, in the first place, on using various types of additives -modifiers, the application of which is one of the most universal, available and flexible means of controlling the concrete technology and regulating its properties. The plasticizers and superplasticizers [5,6] are of special interest in this sphere. Added at small amounts (0,1…2% of the cement weight), they allow regulating the concrete mixes properties and obtaining concretes with the predictable properties for the specified operating conditions.…”

Section: The Main Partmentioning

confidence: 99%

Reclamation of chemical wastes for the production of efficient concrete modifiers

Kosukhin¹,

Старостина²,

Kosukhin³

2018

IJET

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The research concerning the obtaining of highly-efficient polyfunctional superplasticizers for concretes on the basis of chemical production waste with the purpose of their reclamation and improving the environmental situation in the populated areas has been carried out. The highly-efficient concrete admixtures on the basis of various wastes have been synthesized and patented. A new efficient modifier based on pyrocatechin production waste has been suggested. The colloid and chemical properties of the obtained modifier and its influence on physical, mechanical and maintenance-engineering characteristics of concrete have been researched. Its comparative evaluation with the known plasticizing admixtures has been presented. It has been demonstrated that the superplasticizer under study is the most efficient in terms of plasticizing activity and improving the physical and mechanical properties of concretes and concrete mixes and has a polyfunctional effect. Its application allows increasing the concrete mixes flowability and concrete strength, reducing the concrete consumption, providing the concrete with fungicidal properties, cutting the production costs and solving ecological problems of the chemical production waste recycling.

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“…At present the technological progress in the sphere of concrete technology consists mostly in its chemicalization and is conditioned by the designing and application of highly-efficient admixtures for concretes and building mortars -the polyfunctional modifiers [1]. In this regard, the more detailed study and the enhancing of opportunities of using both the existing PFM and especially the newly developed ones are of great academic and practical interest.…”

Section: Introductionmentioning

confidence: 99%

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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Colloid-Chemical Bases on Creation of Multifunctional Modifiers of Concrete Mix and Concrete

Cited by 7 publications

References 6 publications

A Mechanism of Action of a Polyfunctional Modifier Made of Hydrocarbons Production Waste in Mineral Suspensions Based on Fine-Ground Cements

A Mechanism of Action of a Polyfunctional Modifier Made of Hydrocarbons Production Waste in Mineral Suspensions Based on Fine-Ground Cements

Reclamation of chemical wastes for the production of efficient concrete modifiers

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

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