Studying of influence of fiber reinforcing at fine-grained concrete applying in transport construction

Begunov, Oleg; Alexandrova, Olga V.; Solovyov, V.G.

doi:10.1088/1755-1315/90/1/012016

“…The world accepted producing technology suppose to store products in molds for 24 hours, and then to conduct a steam curing for 48 hours under temperature 80…90 ˚C. In the previous work it was defined that oven chamber heat treatment under temperature 150…250 ˚C allows gaining increase of compression strength of UHPC specimens [16][17][18], including those, which were steam cured before. In the present study it was decided to find the possibility to use this method for accelerating production of UHPC elements.…”

Section: Experiments Programmentioning

confidence: 99%

Combined Heat Treatment Method for Producing of Ultra-High Performance Concrete

Soloviev

¹

,

Efishov

²

,

Matyushin

³

2022

SSP

0

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Decreasing an overall time of curing for UHPC products is a perspective task that can be solved by combining different heat treatment technologies. The paper presents the results of studying the UHPC microstructure after combined steam and non-steam heat treatment. Concrete specimens after demolding were steam cured for 16 hours, than – in oven camber. Heat treatment in oven chamber for 8 hours under temperature 250 ̊С leads to micro-defects self-healing, due to the new crystalline phase formation. The combined heat treatment allows unleashing of additional potential of UHPC mixes, which could take years in normal conditions The considered curing method with further treatment in oven can not only accelerate the process, but also unleash the additional part of UHPC pozzolanic potential for different mix compositions.

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“…A classic example of a shell of variable thickness is, for example, a cooling tower shell [4]. Variable cross-section panels are used in frameworks of bridges, retaining walls, overpasses, prefabricated large-size slabs for industrial and civil buildings of types "T", "2T" and other structures [5][6][7][8][9][10]. In particular, when designing reinforced concrete floor slabs or roof slabs, a method of stress reduction is often used both in the marginal and in the main part of the slab due to its gradual thickening towards the contour line.…”

Section: Introductionmentioning

confidence: 99%

The family of multilayered finite elements for the analysis of plates and shells of variable thickness

Агапов¹,

Markovich²

2021

S. F. J. of Dev.

3

0

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Urban development requires careful attitude to environment on the one hand and protection of the population from the natural phenomena on the other. To solve these problems, various building structures are used, in which slabs and shells of variable thickness find the wide application. In this work, the family of multilayered finite elements for the analysis of plates and shells of variable thickness is described. The family is based on the simplest flat triangular element of the Kirchhoff type. The lateral displacements in this element are approximated by an incomplete cubic polynomial. Such an element is unsuitable for practical use, but on its basis, improved elements of triangular and quadrilateral shape are built. Particular attention is paid to taking into account the variability of the cross-section. The results of the developed elements testing are presented, and the advantages of their use in the practice of designing and calculating the structures are shown. El desarrollo urbano requiere una actitud cuidadosa con el medio ambiente, por un lado, y la protección de la población frente a los fenómenos naturales, por otro. Para resolver estos problemas, se utilizan diversas estructuras de edificios, en las que las placas y cáscaras de espesor variable encuentran una amplia aplicación. En este trabajo se describe la familia de elementos finitos multicapa para el análisis de placas y cáscaras de espesor variable. La familia se basa en el elemento triangular plano más simple del tipo Kirchhoff. Los desplazamientos laterales en este elemento se aproximan mediante un polinomio cúbico incompleto. Este elemento es inadecuado para su uso práctico, pero sobre su base se construyen elementos mejorados de forma triangular y cuadrilátera. Se presta especial atención a tener en cuenta la variabilidad de la sección transversal. Se presentan los resultados de las pruebas de los elementos desarrollados y se muestran las ventajas de su uso en la práctica del diseño y el cálculo de las estructuras.

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“…A classic example of a shell of variable thickness is, for example, a cooling tower shell [4]. Variable crosssection panels are used in frameworks of bridges, retaining walls, overpasses, prefabricated large-size slabs for industrial and civil buildings of types "T", "2T" and other structures [5][6][7][8][9][10]. In particular, when designing reinforced concrete floor slabs or roof slabs, a method of stress reduction is often used both in the marginal and in the main part of the slab due to its gradual thickening towards the contour line.…”

Section: Introductionmentioning

confidence: 99%

The family of multilayered finite elements for the analysis of plates and shells of variable thickness

Агапов

¹

2019

E3S Web Conf.

1

0

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Urban development requires careful attitude to environment on the one hand and protection of the population from the natural phenomena on the other. To solve these problems, various building structures are used, in which slabs and shells of variable thickness find the wide application. In this work, the family of multilayered finite elements for the analysis of plates and shells of variable thickness is described. The family is based on the simplest flat triangular element of the Kirchhoff type. The lateral displacements in this element are approximated by an incomplete cubic polynomial. Such an element is unsuitable for practical use, but on its basis, improved elements of triangular and quadrilateral shape are built. Particular attention is paid to taking into account the variability of the cross-section. The results of the developed elements testing are presented, and the advantages of their use in the practice of designing and calculating the structures are shown.

show abstract

Studying of influence of fiber reinforcing at fine-grained concrete applying in transport construction

Cited by 3 publications

References 9 publications

Combined Heat Treatment Method for Producing of Ultra-High Performance Concrete

Combined Heat Treatment Method for Producing of Ultra-High Performance Concrete

The family of multilayered finite elements for the analysis of plates and shells of variable thickness

The family of multilayered finite elements for the analysis of plates and shells of variable thickness

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