Theoretical foundations of the structure formation of cement stone and concrete

Khasanov, Bakhridin; Irmuhamedova, Lyudmila; Firlina, G.; Mirzaev, Temur

doi:10.1088/1757-899x/869/3/032032

Cited by 20 publications

(13 citation statements)

References 3 publications

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“…The established pattern of structural adaptability is common [5], [16][17][18][19][20][21][22][23][24][25][26] for the frictional interaction of materials with cotton and can be analytically described by an exponential relationship:…”

Section: Resultsmentioning

confidence: 99%

Features of structural adaptability of polymer composite coatings

et al. 2021

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Coatings based on thermosetting and thermoplastic polymer binders using mechanically activated silicate fillers from local natural raw materials (from Koytash deposit), activated on a mechano-activator of wollastonite of different dispersion were investigated. The studies conducted made it possible to establish the effect of the surface roughness of the material on the cotton fiber damageability under their frictional interaction and the phenomena occurring in the polymer-cotton tribosystem, where, after the end of non-stationary friction, i.e. during the running-in period with a stable frictional interaction, the processes of formation of dynamic tribostructures continuously occur. These tribostructures provide a certain stable and minimum value of the friction force, and their destruction is compensated by their restoration, owing to information feedback.

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Section: Resultsmentioning

confidence: 99%

Features of structural adaptability of polymer composite coatings

et al. 2021

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“…Numerous studies [24][25][26][27][28][29] have established that the degree of squeezing out excess mixing water during vibration-impact pressing depends on its initial content in concrete, on cement consumption, the initial volume of voids in the mixture, and the intensity of compaction, fig. 1, and the highest compression ratio corresponds to a pressure of 3 to 7 MPa.…”

Section: Resultsmentioning

confidence: 99%

“…To acquire the ability to deform under the action of normal forces, it is necessary that the cement paste covers all the aggregate grains and occupies the voids between them. Consumption of cement and components for studying the effect of the composition of the mixture on the efficiency of its compaction was determined following the instructions and the manual [27][28][29][30][31]]. From the calculated compositions, two series of concrete samples with a diameter and height of 150 mm were prepared: the first series of concrete samples was compacted by vibration for 5 minutes with an amplitude of 0.4 ... 0.6 mm, a frequency of 50 Hz, with vibration compaction, water filtration is insignificant; the second -after a 2-minute vibration, it was compacted by vibro-impact pressing for 8 minutes.…”

Section: Methodsmentioning

confidence: 99%

“…The production of high-strength concrete by vibration-impact pressing is achieved by densely filling the intergranular space with cement paste and mortar with a simultaneous displacement of air bubbles, squeezing out part of the free water behind the portions of the compacted mixture [13][14][15][16][17][18][19]. In case of an unsuccessful selection of the composition of the concrete mixture, a rigid, practically incompressible frame of aggregate grains can form [20][21][22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

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Compressive strength properties of hyper-compacted concrete

2021

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The most important property of a concrete mix is concrete workability, i.e., the ability of the mixture to spread and take a given form while maintaining solidity and uniformity. The main influence on the workability of the concrete mixture is exerted by water consumption and, in part, cement consumption. Workability is determined by the mobility of the concrete mixture at the time of filling the mold and plasticity, i.e., the ability to deform without breaking the continuity. In the process of vibrating and pressing the concrete mixture placed in the mold, the total volume of the mixture changes until the pressure is balanced by the resistance forces. Deformation of concrete mix or, more precisely, freshly laid concrete with any compaction methods, including vibration compaction, is divided into elastic (reversible) and residual (irreversible). Residual deformations during vibration compaction occur as a result of water squeezing out and redistribution of aggregate fractions. Permanent deformation is part of the total. Its value at the same composition of the concrete mixture depends on the shape and size of the pressed sample. At the same time, it is noteworthy that after reaching a certain pressure, only elastic deformations will be characteristic of the freshly laid concrete mixture. So, A.D. Nikitin, in the course of the experiments, found that at a pressure of 2.2 MPa, the elastic moduli of the components of the concrete mixture have the following values: for cement paste - 0.16 · 104 MPa, aggregate - 4.5 · 104 MPa and air - 3 MPa ... After reaching a static pressure of 2.2 MPa, the compressible mixture showed only elastic deformation. This indicates that by the time the specified pressure was reached, the relative movement of the aggregates had ended, i.e., they are located most compactly.

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“…Over the past decade, the automobile fleet of Uzbekistan has grown several times. According to road specialists and designers, the traffic intensity on some roads is 1.5 -3 times higher than allowed for this road category [1][2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%