Ensuring the Safety of Construction Works During the Erection of Buildings and Structures

Goldobina, L. A.; Demenkov, Peter; Trushko, Olga

doi:10.31897/pmi.2019.5.583

Cited by 11 publications

(3 citation statements)

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“…Demolding the samples was carried out after 2 days. Samples with modified technical sulphur were subjected to additional volumetric thermocatalytic treatment at 180 • C for 60 min, and then gradually cooled to room temperature for 2 h [4,5,42]. All samples were stored in wet conditions for 28 days and then, after 28 days, the samples were loaded into the aggressive hydrosulphate medium.…”

Section: Sample Preparationmentioning

confidence: 99%

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Influence of Sulphate Attack on Properties of Modified Cement Composites

et al. 2021

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Monitoring the condition of building structures based on composite materials in aggressive environments shows that the deterioration of basic properties occurs under the influence of various factors such as temperature and humidity changes,in addition to changes in the chemical composition of air environment. In addition, the composite materials during the operation must retain not only the mechanical properties laid down at the design stage, but also the electro-physical characteristics, regardless of the type of destructive effects. In the current study, the quantitative assessment of the result of the interaction of an aggressive sulphate-containing medium with composites modified with conductive and dielectric additives was carried out. The effect of sulphateattack on the specific electrical conductivity of cement composites was studied. The nature of the interaction was evaluated by changing the properties of the samples of the developed compositions under the influence of a single-normal solution of sodium sulphate. The analysis was carried out by means of potentiometric titration using the exchange interaction method by fixing the degree of absorption of sulphate ions and determining the concentration of calcium ions in the solution. The measurement of the solution potential allowed determination of the quantitative indicators of the rate of calcium hydroxide leaching from the sample structure,which is necessary to assess the intensity of the destruction process and determine the nature of the change in strength properties.Measurements of the electrical resistivity of samples under the constant influence of sulphate aggression were taken during 28 days of observation. A method for quantifying the effect of a sulphate medium on a cement matrix was proposed that enables the material durability to be predicted. The features of changes in the morphology of structural components after exposure to aggressive solution were determined by physical and chemical methods.

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Section: Sample Preparationmentioning

confidence: 99%

“…2021, 11, 8509 2 of 13 protect against aggressive influences. Waterproofing via surface penetration of the compositions or bulk thermocatalytic impregnations can be distinguished as the main methods of waterproofing building capillary-porous materials [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Influence of Sulphate Attack on Properties of Modified Cement Composites

et al. 2021

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“…There is also a large number of works related to the development of digital models [26,41], taking into account the analysis of the electric drive system, which makes it possible to form the basis for the development of integrated methods of the monitoring and evaluation of energy efficiency. This approach allows for the use of digital models for the detection of pre-emergency situations by determining the stress-strain state [42] of individual mill units.…”

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confidence: 99%

Development MPC for the Grinding Process in SAG Mills Using DEM Investigations on Liner Wear

Beloglazov,

Plaschinsky

2024

Materials

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The rapidly developing mining industry poses the urgent problem of increasing the energy efficiency of the operation of basic equipment, such as semi-autogenous grinding (SAG) mills. For this purpose, a large number of studies have been carried out on the establishment of optimal operating parameters of the mill, the development of the design of lifters, the rational selection of their materials, etc. However, the dependence of operating parameters on the properties of the ore, the design of the linings and the wear of lifters has not been sufficiently studied. This work analyzes the process of grinding rock in SAG mill and the wear of lifters. The discrete element method (DEM) was used to simulate the grinding of apatite-nepheline ore in a mill using different types of linings and determining the process parameters. It was found that the liners operating in cascade mode were subjected to impact-abrasive wear, while the liners with the cascade mode of operation were subjected predominantly to abrasive wear. At the same time, the results showed an average 40–50% reduction in linear wear. On the basis of modelling results, the service life of lifters was calculated. It is concluded that the Archard model makes it possible to reproduce with sufficient accuracy the wear processes occurring in the mills, taking into account the physical and mechanical properties of the specified materials. The control system design for the grinding process for SAG mills with the use of modern variable frequency drives (VFD) was developed. With the use of the proposed approach, the model predictive control (MPC) was developed to provide recommendations for controlling the optimum speed of the mill drum rotation.

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