Theoretical Evaluation of Rheological State of Sand Cement Composite Systems with Polyoxyethylene Additive Using Topological Dynamics Concept

Erofeev, Vladimir; Bobryshev, Aleksandr A.; Лахно, Александр Викторович; Shafigullin, L. N.; Khalilov, I. A.; Сибгатуллин, К. Э.; Igtisamov, Rafael

doi:10.4028/www.scientific.net/msf.871.96

Cited by 18 publications

(5 citation statements)

References 24 publications

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“…Для изготовления каркасных композитов используется широкий спектр вяжущих: полимерные, цементные, гипсовые, жидкостекольные, серные, битумные, смешанные и другие. На данный момент упруго-прочностные и структурные характеристики, долговечность, химическая и биологическая стойкость матричных составов и каркасных композитов на их основе достаточно хорошо изучены в работах [11][12][13][14][15][16][17][18][19][20].…”

Section: состояние проблемыunclassified

Creep study of carcass composites reinforced with steel fiber of the Dramix type

Леснов

2019

Russian journal of transport engineering

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The results of a creep study of disperse-reinforced building composites made by carcass technology are presented. In the experiment, steel fiber «Dramix» type fiber was used as dispersed reinforcement, the content of which was 1…3 % by volume of the composite. The impregnation matrix was made on the basis of portlandcement and a superplasticizing additive of the brand Melflux 1641 F. In the creep test, the samples-beams were loaded according to a 4-point scheme. The level of load applied to the samples was 30, 50 and 70 % of the maximum values. An unreinforced carcass composite was taken as a control composition. The tests continued until the moment when the value of the deflection became constant. Based on the data obtained, graphical dependencies «relative deflection – exposure time» were constructed. On the obtained creep curves of carcass composites in the general case, four sections of the kinetics of deflection change can be distinguished: the initial section, in which an intense, almost linear, increase in deflections occurs; the curved section where the attenuation of the process of growth of deflections is observed; a linear section in which the increase in deflections is insignificant and has a quasi-permanent character; the final section, when the stabilization of the deflections occurs, and their values become constant. The minimum deflection values were obtained for an unreinforced carcass composite, and the maximum for composite reinforced with 1 % «Dramix» fiber. When the composition of the carcass composites contains 2–3 % fiber, a significant decrease in the deflections was observed, but their values were higher than that of the control composition. This is explained by the different load applied to the reinforced and unreinforced samples of carcass composites, as well as the positive effect of increasing the content fiber to 2–3 % on their bending strength and stiffness. The studied dispersion-reinforced carcass composites can be used for the manufacture of monolithic industrial floors, foundations and pavements, working under the influence of increased mechanical influences.

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Section: состояние проблемыunclassified

Creep study of carcass composites reinforced with steel fiber of the Dramix type

Леснов

2019

Russian journal of transport engineering

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“…Today's creation of effective cement composites is firmly linked with the introduction of additives into their compositions. Their use ensures the appearance of high-strength, frostresistant and corrosion-resistant cement concretes [1,2,3,4,5,6,7,8,9,10,11,12,13]. Additives are widely used to produce special concretes [14,15,16,17,18].…”

Section: Introductionmentioning

confidence: 99%

Improving the strength and resistance of cement composites to the external environment by utilizing complex additives

Fedortsov

Ashchepkov

et al. 2021

E3S Web Conf.

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The article discusses the influence of complex additives on the strength and resistance of cement composites to environmental impacts. One of the additives - PFM-NLK (concrete modifier)- a factory fabricated mixture of a superplasticizer with the addition of air-retaining and water proofing substances. Another one is a complex additive containing a superplasticizer, sodium tetraborate and boric acid.Common denominator is the content of the superplasticizer. It allows reducing the W / C ratio of the mixture thereby increasing the density and strength of the composite, and, accordingly, its frost and corrosion resistance. PFM-NLK water-proofing and air-retaining substances additionally work toward the formation of a material structure with increased frost resistance. The components of the other additive, boric acid and sodium tetraborate, form a borate buffer system, which leads to the softening of the “chemical impact” and thus further increases the corrosion resistance. The research findings revealed the effectiveness of complex additives and substantiated the regularity that if each factor is separatelyfacilitative forproperty improvement, then, when they are combined, the effect is multiplied. The PFM-NLKcomponents, when combined, contribute to obtaining a material structure with high frost resistance. An additive containing a hyper-plasticizer, boric acid and sodium tetraborate leads to an increase in strength and acid resistance.

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“…Concretes of various types are widely used in the construction of buildings and structures designed for various purposes [1,2,3,4,5,6]. A prospective direction for improving the quality of construction products and structures is the use of concretes with multicomponent modifiers of a wide spectrum of action [7,8].…”

Section: Introductionmentioning

confidence: 99%

“…A prospective direction for improving the quality of construction products and structures is the use of concretes with multicomponent modifiers of a wide spectrum of action [7,8]. As an example of achieving sufficiently high physical and technical properties of composite materials one can refer to powder-activated concretes [9,10,11,12,13,14]. Superplasticizers play a significant role in the process of structure formation of these concretes.…”

Section: Introductionmentioning

confidence: 99%

Effect of Cement Paste Preparation Procedure and Cement Stone Age on its Phase Composition

Maksimova

Makridin

Dergunova

et al. 2021

KEM

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Self-levelling and self-consolidating concrete mixtures formed with the use of superplasticizers are worthwhile for the manufacture of reinforced concrete structures. It is important to evenly distribute not only the mixing water in the system, but also the dissociated plasticizer ions for cement dispersed compositions with plasticizing additives. It is established that the optimal sequence of loading and mixing of the components of a cement composition is not only a promising direction for intensifying the manufacture of concrete building structures, but also a tool for improving the mechanical properties of cement brick and concrete made on its basis, as well as for increasing its durability and reliability. When superplasticizers are introduced into the pre-ground cement paste, the rheological properties of the compositions are improved, as well as the structure of the hardened composites. The given article is devoted to the study of the effect of the procedural factor and the duration of mixing of highly concentrated cement compositions with the addition of a superplasticizer based on naphthalene sulfonic acid (SP C-3) on the phase composition of hardened composites during various periods of hydration. Experimental results were obtained using the X-ray phase analysis method. Tested are 15 series of samples of cement stone with W/C ratio range between 0,18 and 0,27 and SP C-3 between 0 and 1.0 % by cement weight. Comparing the phase composition of cement stone after 28 days of hardening with that of 4,5 years, it was found that at first the C3SH2 phase, particularly enriched with calcium oxide, is formed, which decays over time and disappears in the 4,5-year hardening amples.

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Theoretical Evaluation of Rheological State of Sand Cement Composite Systems with Polyoxyethylene Additive Using Topological Dynamics Concept

Cited by 18 publications

References 24 publications

Creep study of carcass composites reinforced with steel fiber of the Dramix type

Creep study of carcass composites reinforced with steel fiber of the Dramix type

Improving the strength and resistance of cement composites to the external environment by utilizing complex additives

Effect of Cement Paste Preparation Procedure and Cement Stone Age on its Phase Composition

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