Analytical Solutions for Taking into Account Composite Action of Reinforcement and Concrete in the Evaluation of Stresses in the Principal Planes of Girder Web Plates with Prestressed Reinforcement

Belutsky, Igor; Ia, Alekseeva

doi:10.1088/1757-899x/753/4/042074

Cited by 2 publications

(2 citation statements)

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“…The fine dispersed systems (nanolevel) appear by hydration of cement binder, as evidenced by the work of many scientists [2,8,17]. It was noted that the structures with a high specific surface area of new growths or containing a highly dispersed filler, as well as having a uniform microporosity of surface, have the greatest advantages in strength [18,19].…”

Section: Theoretical Basis Of the Process Of Strength Gain Of An Arti...mentioning

confidence: 99%

Dynamics of Strength Gain of an Artificial Stone Based on a Cement Binder

Ukrainskiy

Kamenchukov

Voinash

et al. 2021

MSF

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The article discusses the existing theories of physical and chemical processes occurring in artificial stone based on a cement binder, affecting the dynamics of strength gain. A mathematical model of the continuously increasing strength of the cement stone according to the logarithmic law has been investigated. The authors questioned the adequacy of the application of such theories to exclude the factor of hardening time from experiments aimed at identifying the effect of such measures as the use of surfactants, mineral additives, changes in the water-cement ratio, etc., on the strength gain. The authors proposed to study the influence of such factors on the dynamics of changes in the strength of cement stone as a more efficient tool. The main arguments of the theory of abrupt strength gain and destruction of cement systems are presented. The authors planned an experiment to plot the dynamics of the strength gain of an artificial stone based on a cement binder to assess the relevance of the problem. During the experiment, two batches of specimens were tested, six specimens in each at 3-, 7-, 14-, 28-, 56-and 84-day age, respectively. The values obtained during the experiment showed significant differences at an early age of hardening. The theoretical curves of variation of strength in time were obtained based on the experimental data, within the framework of the existing theory of the strength gain of an artificial stone based on a cement binder. The simulation results were compared with the experimental results and with each other. The arguments were put forward for and against existing theories based on the results of the analysis of experimental studies and theoretical calculations.

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Section: Theoretical Basis Of the Process Of Strength Gain Of An Arti...mentioning

confidence: 99%

Dynamics of Strength Gain of an Artificial Stone Based on a Cement Binder

Ukrainskiy

Kamenchukov

Voinash

et al. 2021

MSF

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“…Roads are one of the main factors in the development of the region and the country as a whole. The social and economic development of the Far Eastern Federal District is associated with the development of a vast territory, thousands of kilometers away from large industrial centers of Russia, and is determined by the condition and efficiency of the transport system [1][2][3][4]. The experience of designing and building roads in the south of the Far East has shown that the actual inter-maintenance period of roads is much less than generally accepted in standards.…”

Section: Introductionmentioning

confidence: 99%

Modeling of reflected cracks in asphalt concrete pavement of highways

Kamenchukov¹,

Ukrainskiy²,

Bushuev³

et al. 2021

J Appl Eng Science

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The paper considers the issues of crack resistance of multilayer systems made of asphalt concrete, namely: the causes and features of the occurrence and development of "reflected" cracks are investigated. A study of the operational state of highways was carried out and the prerequisites for the formation of defects on the pavement were determined, including the regional features of the work of the road structure. The authors comprehensively studied the causes of internal and external defects and deformations of asphalt concrete pavements. The most popular technologies for sealing cracks and restoring the pavement are considered, the experience of repairing roads in the western part of Russia, Europe and the USA is also investigated. The results of determining the rate of formation and development of defects in the surface of the exploited roads are presented. In laboratory conditions, work was carried out to simulate cracks in two-layer samples of fine-grained asphalt concrete. Test specimens with a height and diameter of 10 cm were made by molding and compacted in layers, a crack was laid in the lower layer of the specimen. After gaining strength, the samples were tested for compression. Analysis of the results of physical modeling made it possible to put forward an assumption about the existence of a relationship between the presence (absence) of internal defects in the coating and the strength of the structure. To confirm the hypothesis, mathematical modeling of the operation of a two-layer system in the GenIDE32 software package was performed. Evaluation of the stress-strain state by the finite element method showed the presence of characteristic zones of system weakening around the defect area. In a two-layer system, there is an increase in internal stresses and strains around the crack, as well as a decrease in the overall strength (stability) of the system. In conclusion, the influence of internal defects of asphalt concrete coatings on the process of formation of "reflected" cracks were identified.

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Analytical Solutions for Taking into Account Composite Action of Reinforcement and Concrete in the Evaluation of Stresses in the Principal Planes of Girder Web Plates with Prestressed Reinforcement

Cited by 2 publications

References 0 publications

Dynamics of Strength Gain of an Artificial Stone Based on a Cement Binder

Dynamics of Strength Gain of an Artificial Stone Based on a Cement Binder

Modeling of reflected cracks in asphalt concrete pavement of highways

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