Improvement of competitive edge of precast reinforced concrete by increasing the reliability level and quality control

Belentsov, Yu. A.; Smirnova, Olga; Kazanskaya, Liliya

doi:10.1088/1757-899x/666/1/012037

Cited by 4 publications

(3 citation statements)

References 25 publications

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“…Moreover, the number of accidents in concrete and reinforced concrete building structures in some years accounts for more than half of all accidents. The graph shows an analysis of building accidents in the Russian Federation by building type in 1999-2003 [4][5].…”

Section: Introductionmentioning

confidence: 99%

Implications of the compressive strength control accuracy on the probability of accepting defective concrete elements

Leykin,

Belentsov,

Kazanskaya

2023

E3S Web Conf.

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The contribution of control method inaccuracy to the accuracy and performance of building structures while adhering to the metrological requirements for the strength determination process in reference materials is analysed. The metrological fundamentals for improving the testing and quality control methods of modern concretes and their impact on the reliability of erected structures are developed. The measurement accuracy dependence on the quality control of concrete materials and products by destructive methods is established, the number of rejected products is determined. The accuracy of concrete quality control is assessed in relation to the likelihood of defective products. A Bayesian model is proposed for the probability of missing a defective product with known control confidence and the probability of error due to measurement and testing error in the control process. The additional probability of missing concrete defects in strength when testing in standard specimens by the destructive method due to imperfect test methods is calculated. The 'non-zero probability' of missing a defect in the concrete strength control process affecting the level of reliability is assessed, provided the metrological requirements for the test are met.

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Section: Introductionmentioning

confidence: 99%

Implications of the compressive strength control accuracy on the probability of accepting defective concrete elements

Leykin,

Belentsov,

Kazanskaya

2023

E3S Web Conf.

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“…The interrelation of concrete and reinforcement destruction is considered on numerous examples. Paper [11] is listed as a good illustration of this type of investigation.…”

Section: Introductionmentioning

confidence: 99%

“…In the overwhelming majority of cases, the fabricating yards produce products by autoclaving, during which the concrete setting occurs under an elevated temperature (191 • C) and pressure, exceeding the atmosphere's pressure by 10% [9]. However, the assembly occurs outdoors, whereby a strict quality control of joint sealing between the mating structures, or cement grout or concrete drying temperature is impossible [10,11]. These determine the comparatively inferior quality of concrete quality in joints.…”

Section: Introductionmentioning

confidence: 99%

The Study of Metal Corrosion Resistance near Weld Joints When Erecting Building and Structures Composed of Precast Structures

2022

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Corrosion processes of the most common steel grades in various environments are the subject of numerous studies. At the same time, the corrosion of welded joints hidden in concrete thickness has not yet been studied. The authors set themselves the task of investigating this process. For this purpose, the corrosion resistance of several metals (grade St.3, U7 and their weld joints) was studied in standard test solutions, simulating a concrete pore liquid, containing sodium carbonates and hydrocarbonates, and sodium chlorides. Data on comparative corrosion resistance in saline media for specified materials were obtained. It was shown that the corrosion rate depends on the ease of CO2 ingress into the solution, and, to a lesser degree, on the metal microstructure. The surface character of the metal samples and the composition of corrosion products were investigated by scanning electron microscopy and an X-ray diffraction analysis. Chemical forms of surface compounds were determined. For the first time, it is clearly shown that the electrode coating flowing during welding does not always protect the weld from corrosion, as was previously believed. The corrosion rate, in this case, is just the same as at the surface of the metal plate of a similar composition. In the conclusion of this work, it is emphasized that in the case of alkaline and chloride-containing media, the protective coating falling from the electrode to the weld does not protect it sufficiently from corrosion.

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Development of quality control methods for measurements and testing concrete structures

Belentsov,

Rybalko

2024

E3S Web of Conf.

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The development of building materials, structures, calculation and design methods, technologies leads to a significant lag in quality control methods, in particular, concrete. Modern control methods cannot guarantee the level of reliability of buildings and structures under construction. The standards for designing and controlling the compressive strength class of concrete, which are controlled according to various schemes, cannot meet the requirements for reliability during construction and operation. Goal. Give recommendations on the use of various concrete classes to ensure the required level of reliability and reliability of critical structures. Methods and materials. Standard concrete samples of classes B 30,50,100 in the form of 150 mm cubes were used as materials. Methods for estimating random variables for the load-bearing capacity and the load effect on the structure are used. Results. Different classes of concrete in terms of compressive strength provide different safety margins. With an increase in the concrete class, the safety factor increases, which ensures more efficient use of high-strength concretes in construction practice in terms of reliability. The probability of failure increases as the concrete class increases, which is due to different safety factors as the class increases. Practical significance. The development of control methods contributes to the level of development of engineering and technology of design and construction. The conducted research will improve the accuracy and quality of measurements and tests in the control of building materials and structures, even when using destructive methods.

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Improvement of competitive edge of precast reinforced concrete by increasing the reliability level and quality control

Cited by 4 publications

References 25 publications

Implications of the compressive strength control accuracy on the probability of accepting defective concrete elements

Implications of the compressive strength control accuracy on the probability of accepting defective concrete elements

The Study of Metal Corrosion Resistance near Weld Joints When Erecting Building and Structures Composed of Precast Structures

Development of quality control methods for measurements and testing concrete structures

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