Physicochemical studies of the structure of energy-saving compositions based on slags

Kostyuk, Tetyana; Vinnichenko, Varvara; Plugin, rii; Borziak, Olga; Iefimenko, Artem

doi:10.1088/1757-899x/1021/1/012016

Cited by 14 publications

(6 citation statements)

References 10 publications

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“…Cement concrete with fine and coarse aggregates based on rubber crumb from used car tires can have good sound-absorbing properties according to published data [17][18][19]. In addition, sound-absorbing cement composites can reduce the cost of walls by eliminating sound-absorbing layers, for example, based on polymer materials, as well as reduce the construction duration.…”

Section: Introductionmentioning

confidence: 92%

Sound-Absorbing Composites with Rubber Crumb from Used Tires

et al. 2021

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Traditional sound-absorbing materials have a number of disadvantages: low water resistance, low compressive and tensile strengths, low weather resistance, etc. Therefore, new sound-absorbing materials need to be developed with improved properties including the involvement of industrial byproducts. The influence of the grain-size composition of the rubber crumb from used car tires on the sound insulation of cement and gypsum composites was studied in the paper. The results of the study contribute to the creation of a structural material for the manufacture of sound-absorbing as well as load-bearing structures. The field of application of the developed materials is very extensive.

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Section: Introductionmentioning

confidence: 92%

Sound-Absorbing Composites with Rubber Crumb from Used Tires

et al. 2021

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“…Known ways to reduce the heat release by regular Portland cement are the use of mineral admixtures and chemical additives, as well as their combinations [14]. Several works show the effectiveness of mineral additives as heat release regulators, for example, blast furnace granulated slag (FGS) [15]. The effectiveness of the flue ash additive is shown in [16] to reduce the heat release by concrete during the construction of a dam.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Comparison of influence of surfactants on thermokinetic characteristics of alkali-activated slag cement

Kryvenko

Rudenko

Konstantynovskyi

2021

EEJET

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Increasing the durability of concrete and reinforced concrete structures according to the criterion of crack resistance is a relevant task of construction materials science. To solve this task, this paper proposes effective solutions for adjusting thermofinite characteristics of alkali-activated slag cement (ASC) by using surfactants of various chemical nature in order to control the thermally-stressed state of concrete based on it (ASC concrete). The method of calorimetry was applied to show that the problematic issue is to adjust the structure formation of ASC by anion-active surface-active substances based on complex polyesters. This is predetermined by the instability of the molecular structure of surfactants in the hydration environment of ASC due to the destruction of complex ester bonds as a result of alkaline hydrolysis. Thermokinetic analysis has demonstrated the effectiveness of using anion-active surfactants, which do not contain ester bonds, as regulators of crack resistance of ASC concrete. Simple polyesters and multi-atom alcohols provide the ability to adjust the duration of the induction period while ensuring the required completeness of ASC hydration within a time frame. The effectiveness of cation-active surface-active substances has been shown, which are characterized by the stability of the molecular structure in the hydration environment of ASC and an increased level of adsorbing capacity. The decrease in the effectiveness of surface-active substances has been shown, in terms of the effect on the heat release of ASC, in the following series: alkaline salt of carboxylic acid>salt of the quaternary ammonium compound>simple polyester> polyalcohol>complex polyester. The reported results are important in view of the possibility of effective adjustment of ASC heat release by influencing the structure formation of surfactant with a certain molecular arrangement in order to predictably reduce crack formation in a thermally-stressed state and a corresponding increase in the durability of structures

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“…So, the finer the grind, the faster the composite Portland cement hardens and gains strength. Therefore, at present, increasing the fineness of cement grinding is a technological technique that is most widely used in the production of cement [1]. However, this technological method causes an increase in the cost of cement.…”

Section: Introductionmentioning

confidence: 99%

Ensuring uniformity of strength of fine-grained concrete based on modified composite cement

Shіshkina,

Domnichev

2024

EEJET

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Insufficient determination of the effect of surface-active substances introduced in extremely low concentrations on the formation of the stability of the properties of fine-grained concrete based on composite Portland cements determined the feasibility of conducting research in this area. The studies investigated the influence of the modification of composite cement with water activated by the use of the hydrophilic hydration mechanism. It has been proven that these factors include the type and amount of applied water nano modifiers. The analysis of the study results confirmed that the introduction of water activated by the mechanism of hydrophilic hydration into concrete in extremely small doses significantly increases the rate of formation of concrete strength and reduces the coefficient of its variation. Owing to this, the strength of the resulting modified fine-grained concrete based on composite cement at the age of 3 days exceeds the strength of the similar concrete without additives by 300 %, and at the age of 27 days – by 25 %. At the same time, the coefficient of variation of strength has a minimum value at the optimal amount of nano additive – water modifier. This allows us to assert the effectiveness of the revealed mechanism of modification of composite cement. Thus, there are reasons to assert the possibility of targeted regulation of the processes of formation of a strong homogeneous structure of fine-grained concrete based on composite cement by using water activated by the mechanism of hydrophilic hydration

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Physicochemical studies of the structure of energy-saving compositions based on slags

Cited by 14 publications

References 10 publications

Sound-Absorbing Composites with Rubber Crumb from Used Tires

Sound-Absorbing Composites with Rubber Crumb from Used Tires

Comparison of influence of surfactants on thermokinetic characteristics of alkali-activated slag cement

Ensuring uniformity of strength of fine-grained concrete based on modified composite cement

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