Crack Resistance RC Columns Strengthened by CFRP System

Selejdak, Jacek; Blikharskyy, Yaroslav; Khmil, Roman; Blikharskyy, Zinoviy

doi:10.4028/www.scientific.net/kem.878.127

Cited by 8 publications

(3 citation statements)

References 23 publications

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“…There are many proposals for high-strength, lightweight, and easy-to-mount materials used on the market recently (most often for RC structures strengthening). One such method of strengthening is reinforcement using composite materials (Pham et al, 2013;Selejdak et al, 2021;Torabian and Mostofinejad, 2017). This method describes the arrangement of composite reinforcement (in the strip form) on the outer stretched face of the slab, beam, or column using high-strength paste and anchoring devices if necessary.…”

Section: Introductionmentioning

confidence: 99%

Crack Resistance of RC Columns Strengthened By CFRP Under 30% of Uls Loading

Blikharskyy,

Khmil,

Selejdak

et al. 2023

System Safety: Human - Technical Facility - Environment

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Nowadays, among many existing reinforced concrete (RC) columns, it is impossible to find samples that work only as centrally compressed members – their vast majority work as eccentrically compressed members. On the other hand, the significant volumes of reconstruction in Ukraine will require studies of the work of various RC structures strengthened under different load levels. In addition to choosing the method of strengthening itself, the relevant tasks will be studies of bearing capacity, crack resistance, reliability (including residual resource) of structures, etc. This article presents the method of crack resistance experimental study of eccentrically compressed RC members. The proposed method was tested on unstrengthened (ordinary) and strengthened (in a stretched zone) RC columns; the results of experimental studies for ordinary and strengthened samples were also obtained. The columns were strengthened with a composite material (from many carbon-fiber-reinforced polymers) – the Sika Carbodur S512 strip. The feature of the crack resistance study of columns was that they were strengthened under the initial load level of 30 %. As a result of experimental research on the samples strengthened under load, we stated that the width of the crack decreased on average by about 36 % (at the comparable values of the active load). In turn, the average maximum length of cracks decreased to about 50 % of the height of the cross-section (for unstrengthened samples, this value was approximately 80 %), and the eccentric compressive ultimate load was increased by about 33 %.

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Section: Introductionmentioning

confidence: 99%

Crack Resistance of RC Columns Strengthened By CFRP Under 30% of Uls Loading

Blikharskyy,

Khmil,

Selejdak

et al. 2023

System Safety: Human - Technical Facility - Environment

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“…Also, the main parameters for the second limit state are the width of the crack opening and deflection (Blikharskyy et al, 2018;Malíková et al, 2020;Jończyk, 2020).). The study of knowledge about the patterns of crack propagation, the nature of their development, and the possibility of determining the residual bearing capacity based on the crack opening width for reinforced structures are described in the study (Selejdak et al, 2021;. However, it should be noted that when pre-stressed elements strengthen structures, the nature of crack propagation changes since, in this case, pre-stressing leads to the closing of cracks (Kovalchuk et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Bearing capacity of reinforced concrete beams with and without damages of rebar

Khmil,

Blikharskyy,

Vegera

et al. 2023

Production Engineering Archives

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The article presents the results of the bearing capacity of reinforced concrete beams with and without damages of internal reinforcement. One of the main elements of the production of the reinforced concrete industry is beams. The analysis of the experimental tests showed that the bearing capacity of reinforced concrete beams with damaged tensile main reinforcement decreases according to control undamaged samples due to the reduction of the reinforcement cross-section. However, the bearing capacity of reinforced concrete beams with tensile main reinforcement Ø20А500C, damaged to the cross-section area equal the rebar Ø16mm is more on 3.7… 24.0% than the bearing capacity of reinforced concrete beams with undamaged Ø16mm rebar. This is due to the non-uniform material properties of used thermally strengthened reinforcement A500C. When during testing the tensile main reinforcement is damaged by drilling a hole, the most damages occur in the core with lower physical and mechanical characteristics. In contrast, the outer thermally strengthened layer with bigger physical and mechanical characteristics is damaged to a lesser extent. The analysis of the obtained results shows that during design of reinforced concrete beams with damaged, it is necessary to consider using thermally strengthened non-uniform steel A500C as tensile main reinforcement.

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“…In order to avoid this, necessary measures should be taken to protect concrete from corrosion [ 6 , 7 ]. Therefore, during the further operation, there a need for strengthening and restoration of such structures [ 8 , 9 , 10 ]. This is especially true for industrial buildings, where the medium (liquid and gaseous), which contacts with the surface of building structures, could be contaminated with aggressive products or industrial waste [ 11 , 12 , 13 ].…”

Section: Introduction and Literature Reviewmentioning

confidence: 99%

Study of Concrete under Combined Action of Aggressive Environment and Long-Term Loading

et al. 2021

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A significant part of reinforced concrete structures is subjected to intensive environmental impact during operation. This can cause local destruction and failure of buildings if obligatory measures are not taken to protect them from corrosion. This is especially true for industrial buildings, where the environment could be contaminated with aggressive products or waste. An important issue is the development of methods for calculating the load-bearing capacity and serviceability of reinforced concrete structures with corrosion damage. The main reason for this is the necessity to determine the durability and reliability of buildings and structures and the estimation of their safe operation time. As corrosion damages of concrete are a critical issue, more detailed experimental studies are needed. This paper presents experimental studies of concrete prisms under the simultaneous action of an aggressive environment and a constant level of compressive force. In total, 32 prisms under different loading conditions and in different aggressive medium were tested. Samples were divided in series, for which different load levels were chosen (0.25fck, 0.35fck, 0.45fck). Additionally, control samples in the air and immersed in water were tested. During the experiment, different parameters were monitored and recorded: decrease of cross-sectional size, the temperature and environmental humidity. Results of the study showed that destruction occurred due to the presence of corrosion damages of concrete and a reduction of the cross-sectional area. The stresses in the concrete at the destruction stage were less than the value of the prism strength by 10–12%. It was established that along the contour of the section, there is a partially degraded layer of concrete of 1.5–3.7 mm thickness, with corrosion microcracks and corrosion products. Additionally, experimental and theoretical diagrams of concrete with corrosion damages were obtained and compared. The ultimate deformations of concrete with corrosion damage, which correspond to the prismatic strength of concrete, in comparison with undamaged concrete were lower by 11–18%. Therefore, the concrete strength is decreased during exploitation under loading in an aggressive environment, which needs to be taken into account during calculations.

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Crack Resistance RC Columns Strengthened by CFRP System

Cited by 8 publications

References 23 publications

Crack Resistance of RC Columns Strengthened By CFRP Under 30% of Uls Loading

Crack Resistance of RC Columns Strengthened By CFRP Under 30% of Uls Loading

Bearing capacity of reinforced concrete beams with and without damages of rebar

Study of Concrete under Combined Action of Aggressive Environment and Long-Term Loading

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