On increasing the crack resistance of reinforced concrete structures by introducing fiberglass nets into the protective layer of concrete

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Abstract

Under operating conditions, the protective layer of concrete undergoes significant internal and external influences that lead to the formation of cracks. To increase the reliability and durability of reinforced concrete structures, it is proposed to install fiberglass nets in the protective layer of concrete, which is most susceptible to various aggressive influences during the operation of structures. The purpose of this work was to study the effect of fiberglass nets on increasing the crack resistance of the protective layer of concrete. The forces in the stretched concrete and in the rods of the fiberglass mesh located in the protective layer of concrete are calculated theoretically and using the software package «LIRA-CAD 2016» for a strip of concrete reinforced with a fiberglass mesh. The relative movements of the nodes in concrete and in the grid are determined and the obtained values are compared. As a result of the study, it was found that with a short-term effect of the load, fiberglass nets in the protective layer of concrete do not significantly affect the formation of cracks, with a long-term effect of the load, the presence of fiberglass nets reduces the formation of cracks by up to 2%. After the formation of microcracks in concrete, including from shrinkage deformations, fiberglass nets significantly hinder their further development.

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About the authors

A. V. Kurshpel

Ural Federal University named after the first President of Russia, B.N. Yeltsin

Author for correspondence.
Email: a.kurshpel@yandex.ru

Candidate of Sciences (Engineering), Institute of Civil Engineering and Architecture

Russian Federation, 17, Mira Street, 620002, Ekaterinburg

T. E. Lyskova

Ural Federal University named after the first President of Russia, B.N. Yeltsin

Email: tatianalysk@yandex.ru

Master, Institute of Civil Engineering and Architecture

Russian Federation, 17, Mira Street, 620002, Ekaterinburg

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Supplementary files

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2. Fig. 1. The scheme of the occurrence of aggressive factors in the protective layer of concrete, leading to the formation of cracks: C1, C2 – the protective layer of concrete, X – the depth of carbonization; П –a surface area without corrosion of reinforcement; A-B – areas with corrosion of reinforcement (open ether) (Source: SP 349.1325800.2017. Concrete and reinforced concrete structures. Repair and reinforcement rules)

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3. Fig. 2. Diagram of crack formation on the sample surface from concrete shrinkage: 1 – a concrete beam fragment; 2, 3 – longitudinal and transverse shrinkage cracks; 4 – outer (dried) layer; 5 – inner layer; 6 – tensile stresses [15]

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4. Fig. 3. The scheme of the fiberglass mesh arrangement: a fiberglass mesh cell with an interlacing weave, the pitch of the fibers in the mesh, w from 3 to 5 mm (GOST 55225–2012 «Glass fiber meshes for facades, alkali-resistant reinforcement. Technical conditions»)

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5. Fig. 4. Calculated sample of a protective layer of concrete with a fiberglass mesh: 1 – calculated fragment of a sample for determining forces in concrete and mesh; 2 – calculated fragment of a fiberglass mesh

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6. Fig. 5. Diagram of the force action in stretched concrete and fiberglass mesh: qbt – distributed force from stretched concrete; Nbt – force in the selected fragment: Nf and ΔNf – forces in the stretched rod of fiberglass mesh

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