Water resource saving in irrigation networks through improving the efficiency of reinforced concrete coatings

Kattakulov, Farrukh; Muslimov, T.; Khusainov, A.; Sharopov, Sh; Vokhidov, Oybek; Sultanov, S.H.

doi:10.1088/1757-899x/883/1/012053

Cited by 36 publications

(15 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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“…Noise and vibration levels are general indicators of pump reliability and quality. Modern pump research is a complex task of significant technical complexity, requiring a large number of experiments [9,10].…”

Section: Resultsmentioning

confidence: 99%

Experimental and theoretical studies of pumps of irrigation pumping stations

et al. 2021

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The article presents the results of a study of the wear of individual pump elements, a decrease in their efficiency and significant losses. The nonidentical operation of the extreme and middle pumps was established. The uneven approach of water to the extreme units created reverse flows of water in the suction pipes, work with vibrations of modes close to cavitation. The modernization of the pumps improved the cavitation characteristics due to the elimination of the cavitation center at the impeller inlet in the area of the driven disk, which increased the reliability and durability of the pump. Diagnostics of irrigation pumps made it possible to substantiate proposals for the modernization of their main units and operating modes. The distribution of pumps according to the general level of vibration is shown, indicating the direction at which the maximum value of vibration displacement was recorded and the results of a comparative measurement of the vibration of the units of the pumping station-1 of the Karshi Main Channel (KMC).Studies of the pumps of large irrigation pumping stations have shown a reduction in vibration and an improvement in basic operating parameters. With the participation of the authors, new complex methods of operation are being developed, which allow increasing its reliability by predicting the technical condition.

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“…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%

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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Water resource saving in irrigation networks through improving the efficiency of reinforced concrete coatings

Cited by 36 publications

References 3 publications

Features of structural adaptability of polymer composite coatings

Features of structural adaptability of polymer composite coatings

Experimental and theoretical studies of pumps of irrigation pumping stations

Compressive strength properties of hyper-compacted concrete

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