Increasing the Speed of Formation of the Structure of Fine-Grained Concrete and its Strength

Shyshkin, Alexander

doi:10.4028/p-itx1lu

Cited by 3 publications

(3 citation statements)

References 5 publications

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“…According to [11], hydrophobic radicals of organic substances change the main properties of cement stone and its structures due to changes in the structure of water. This happens due to the slowing down of the growth of new growth crystal nuclei, and the formation of much more small crystals than during the hardening of cements without an organic additive.…”

Section: Discussion Of Results Of Investigating the Influence Of Modi...mentioning

confidence: 99%

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Formation of the strength of fine-grained concrete based on modified slag Portland cement

Shіshkina,

Piskun

2023

EEJET

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The object of research is fine-grained concrete on slag portland cement. Owing to the significant content of metallurgical industry waste in its composition, slag portland cement belongs to ecologically acceptable products. However, the insufficient rate of formation of its structure and, as a result, the main quality indicator, which is compressive strength, limits the field of use of slag portland cement. Therefore, in the studies, the goal was to increase the speed of formation of the strength of fine-grained concrete made on slag portland cement. The studies of the influence of modification of slag portland cement with water, activated by the use of the hydrophobic hydration mechanism, established the factors affecting the speed of formation and the value of compressive strength of fine-grained concrete made on slag portland cement. It has been proven that these factors include the type and amount of applied water nanomodifiers, as well as the type and amount of fine concrete aggregate. The analysis of the study results confirmed that the introduction of water activated by the mechanism of hydrophobic hydration into concrete in ultra-small doses significantly increases the rate of formation of concrete strength. Given this, the strength of the resulting modified fine-grained concrete based on slag portland cement at the age of 2 days exceeds the strength of the similar concrete without additives by 60 %, and at the age of 210 days – by 25 %. This allows us to assert the effectiveness of the identified mechanism of modification of slag portland cement. Thus, there are reasons to assert the possibility of targeted regulation of the processes of forming a strong structure of fine-grained concrete based on slag portland cement by using water activated by the mechanism of hydrophobic hydration

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Section: Discussion Of Results Of Investigating the Influence Of Modi...mentioning

confidence: 99%

“…Work [11] provides the results of studies of the "Portland cement-water-surfactant" system. It is shown that the rate of formation of certain new formations is determined by the mineralogical composition of Portland cement.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Formation of the strength of fine-grained concrete based on modified slag Portland cement

Shіshkina,

Piskun

2023

EEJET

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“…Such concretes have high strength at an early age but high heterogeneity of properties. Work [10] gives the results of research aimed at increasing the speed of formation of the structure of fine-grained concrete and its strength, but there are no data on the stability of strength. The above-mentioned disadvantages of new-generation concrete prevent their widespread use.…”

Section: Literature Review and Problem Statementmentioning

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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Regulation of Porosity of Fine-Grained Concrete Manufactured on Slag Portland Cement

Shyshkin,

Piskun

2024

Scientific Bulletin of Building

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The aim of the work is the theoretical substantiation of the mechanism of water structuring using the effect of hydrophobic hydration on the example of the use of carbohydrate as a nanomodifier. To achieve the goal, the following tasks were set: to perform experimental and theoretical studies of the mechanism of influence of colloidal hydrophobic surfactants on the structure of water. The paper presents the results of theoretical studies of the influence of colloidal hydrophobic surfactants on the structure of water and the hydration mechanism of slag Portland cement. It is shown that the introduction of these surface-active substances into water in very low concentrations leads to the effect of hydrophobic hydration, that is, changes in the interaction between water molecules. Hydrophobic hydration contributes to the formation of the pore structure. It was established that hydrophobic hydration is characterized by the fact that part of the dissolved substance inhibits the translational movement of water molecules and is due to the fact that part of the solution space, corresponding to the own volume of the particles of the dissolved substance, is inaccessible to water molecules. Hydrophilic and hydrophobic hydration have different mechanisms. Large hydrophobic ions cause ordering of the water structure. Having a more ordered structure than pure water, solutions of these salts require less work for dissolution, as a result of which the solubility of the latter increases. The conducted experiments allow us to draw an unequivocal conclusion that polar groups are unable to prevent hydrophobic hydration. The introduction of hydrophobic surfactant molecules into water in the form of dimers is the structuring of water, that is, the formation of a continuous fractal network of water molecules. Keywords: fine-grained concrete, slag Portland cement, hydration, modification, surfactants, water activation

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Increasing the Speed of Formation of the Structure of Fine-Grained Concrete and its Strength

Cited by 3 publications

References 5 publications

Formation of the strength of fine-grained concrete based on modified slag Portland cement

Formation of the strength of fine-grained concrete based on modified slag Portland cement

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

Regulation of Porosity of Fine-Grained Concrete Manufactured on Slag Portland Cement

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