Use Of Fiber Reinforced Concrete Research Articles

Influence of Polymer Fibre Reinforcement on Concrete Anchor Breakout Failure Capacity.

With the increasing use of fibre-reinforced concrete, e.g., in industrial floor and tunnel construction, the associated fastening technology in this material has increasingly become the focus of scientific attention in recent years. Over 25 years ago, design and assessment guidelines for anchoring systems in reinforced concrete were established, which have since evolved into comprehensive regulatory standards. However, these standards only address plain and rebar-reinforced concrete as anchoring bases, neglecting fibre-reinforced concrete. The design of anchorage systems in fibre-reinforced concrete has not yet been standardised. Recent studies and product certifications accounting for steel fibre reinforcement are now seeing their way to publication, supported by a fair amount of scientific research studies. This paper aims to elucidate the effects of polymer fibre reinforcement in this application through a systematic investigation. Experimental studies were conducted to evaluate the system's load-bearing behaviour failing with concrete breakouts under tensile loading. By incorporating the determined material properties of polymer fibre-reinforced concrete and their mathematical interpretation, alternative model proposals are presented to assess concrete breakout resistance. The addition of polymer fibres significantly improves the load-bearing capacity and ductility of concrete under tensile loads, transforming its quasi-brittle response into a more ductile behaviour. Although the fibres had a minor impact on overall material strength, their influence on the tensile capacity of the anchors reveal a 15-20% increase in load resistance and up to a doubling of the failure displacements.

Strength Indicators of Fiber Reinforced Concrete with Carbon Nanomaterials

Concrete composites with low defects, dense and homogeneous, with a high degree of adhesion between the cement matrix and aggregates, as well as a high ratio between static tensile and compressive strengths and plasticity have the best crack resistance characteristics. This ratio increases in the case of the use of fiber-reinforced concrete. Modern research in nanotechnology focuses on the management of matter at the nanoscale level, which makes it possible to create materials with new properties. Due to the high aspect ratio, flexibility, high strength and rigidity, carbon nanotubes (CNTs) exhibit reinforcing properties. Due to their nanoscale features, CNTs interact with a complex network of calcium-silicate-hydrate binder (C – S – H), contribute to a decrease in porosity and compaction of the cement stone structure, increase the shear forces of matrix adhesion in the contact zone. Thus, there are all prerequisites to assert that fiber concrete with a cement matrix modified with carbon nanotubes will have the required high strength characteristics and crack resistance due to multilevel dispersed reinforcement and the efficient operation of fiber in a nanomodified concrete matrix. This article presents the results of testing samples made of cement stone, concrete and fiber concrete with carbon nanotubes. The presence of carbon nanotubes in cement stone contributes to an increase in compressive strength by 11 %, tensile strength during bending by 20 %. The test results of samples made of reinforced fiber concrete modified with nanocarbon materials have shown an increase in tensile strength during bending up to 109 %, tensile strength during splitting up to 82 %, axial tensile strength up to 78 %.

Study on Structural Behavior of Basalt Fiber Reinforced Concrete

Worldwide, a great deal of research is currently being conducted concerning the use of Fibre Reinforced Concrete, Laminates and Sheets in the strengthening and repairing of reinforced concrete members. There have also been several advances made in the development of fibre reinforced concrete to control cracking and crack propagation in plain concrete, and to increase the overall ductility of the material. Majorly, Synthetic fiber has played a dominant role for a long time in a variety of applications for their high specific strength and modulus. In this project the overall aim is to utilize and evaluate the structural performance of Natural Based Basalt Fiber in the concrete which it has as an properties which it is similar to synthetic fibers. The optimum percentage of Basalt fibre in concrete was found with respect to cube compressive strength at the age of 7 and 28 days. The cube specimen was casted for different percentages such as 0.05%, 0.10%, 0.15%, 0.20%, 0.25%, 0.30%, 0.35%, 0.40%, 0.45% and 0.50%(by volume of fraction) by the mass of concrete. The optimum level of basalt fibre was determined. By keeping the optimum level of dosage of fiber the structural behavior of the concrete was evaluated by casting a Beam. By the Structural Behaviour Test, the Basalt Fiber Reinforced concrete shows effective properties such as it control cracking and increase the properties like Tensile strength, Energy absorption and Stiffness. So, Basalt Fibre Reinforced Concrete has the potential for large scale use in concrete construction.

Experimental Investigation of the Explosion Effects on Reinforced Concrete Slabs with Fibers

In today’s world, concrete structures are exposed to various influences, including explosive actions. With the increasing use of fiber-reinforced concrete (FRC), it is essential to investigate its response to blast effects. As there are few studies on this topic worldwide, this research is dedicated to the question of how blast effects affect the damage and properties of six different types of reinforced concrete (RC) slabs. These samples differ in concrete classes (C30/37 and C50/60) and in the type of fibers added (steel and polypropylene). Visual inspections and non-destructive measurements are carried out before and after blasting. The damaged area of the concrete surface is determined by visual inspection, while non-destructive measurements evaluate parameters such as the rebound value of the Schmidt hammer, the electrical resistivity of the concrete, the velocity of the ultrasonic wave, and the dynamic modulus of elasticity. Equal amounts of explosives are applied to five of the RC slabs to enable a comparative analysis of the resulting damage. Based on the comparison of the measured data from these five RC slabs, conclusions are drawn regarding the effects of the explosive impacts on conventionally reinforced concrete slabs compared to those with added fibers. In addition, one of the RC slabs with steel fibers is exposed to approximately three times the amount of explosives to assess the extent of increased damage and to evaluate the suitability of military standards in the calculation of explosive charges for blasting RC elements with fibers.

Life Cycle Sustainability Assessment of industrial flooring

The use of fibre-reinforced concrete for industrial floors makes it possible to significantly contain the phenomenon of crack formation and propagation, which is the cause of degradation in traditional concrete floors. In fact, the structural fibres in place of the welded mesh form a homogeneous and omnidirectional reinforcement throughout the screed layer and, as a result, increase the load-bearing capacity of the structure due to a high residual tensile strength after cracking.This study aims to establish a methodological framework useful for comparing the environmental and economic performance of two alternative technological solutions for large span industrial floors: on the one hand, the traditional concrete solution; on the other hand, the innovative fiber-reinforced concrete solution, specifically tensofloor with post-tensioned reinforcement. To this end, an evaluation approach based on the integrated use of Life Cycle Costing (LCC) and Life Cycle Assessment (LCA) is proposed. The methodology makes it possible to assess (i) the financial sustainability of technological solutions by considering the costs related to the entire life cycle, from implementation to disposal; (ii) the environmental impacts generated by design alternatives in a cradle-to-grave perspective.

Experimental investigation on the seismic performance of prefabricated fiber‐reinforced concrete beam‐column joints using grouted sleeve connections

AbstractTo improve the seismic performance of prefabricated reinforced conventional concrete (PRC) beam‐column joints, fiber‐reinforced concrete (FRC) was used instead of concrete in the core zone of the joint in this article. The optimum volume contents of polyvinyl alcohol (PVA) fibers and steel fibers were first determined to be 0.3% and 1%, respectively, through the material properties tests. Then, four PRC beam‐column joint specimens using grouted sleeve connections and one cast‐in‐place reinforced concrete beam‐column joint specimen were designed considering the factors of PVA fibers, steel fibers, with or without stirrups. The test phenomena and failure mode of the five specimens under low‐cycle cyclic loads were obtained. Finally, the effects of PVA fibers, steel fibers, with or without stirrups on the seismic performance of specimens were analyzed and discussed. The test phenomena indicated that the failure mode of specimens was anchorage damage of steel bars. The prefabricated FRC specimens showed relatively little damage in the core zone of the joint. FRC had a significant improvement on the seismic performance of prefabricated beam‐column joints. The use of FRC in the core zone of the joint can reduce or even eliminate the use of stirrups.

Experimental study on the thermal properties of fiber reinforced concrete (TPFRC)

Fiber-reinforced concrete (FRC) has recently sparked interest in the scientific community because of its superior qualities over regular concrete. Traditional concrete must be strengthened and updated to bear enormous loads and overcome concrete faults such as cracking, swelling, and shrinking. The use of FRC is advantageous in industrial, commercial, and strategically significant buildings that are prone to fires. The experimental results of the study and comparison of thermal characteristics and temperature-dependent mechanical properties of Polypropylene, Steel and Hybrid (steel + Polypropylene) fiber-reinforced concrete are presented in this project. The effect of employing Polypropylene, Steel and Hybrid fibers (steel + polypropylene) in the proportions given and fluctuation in strength parameters, and qualities shown owing to heating at different temperatures were investigated in this study. The thermal properties of the non-metallic and metallic fibers were studied through experimentation and results were concluded. It can be recommended from the experimental investigation that the usage of fiber-reinforced concrete is advantageous for ensuring the safety of important industrial buildings which are often exposed to high temperatures. Polypropylene can be employed in cases which are subjected to unfavorable environmental conditions, impact damages, and surface abrasion.

Experimental and analytical investigation of precast fiber-reinforced concrete (FRC) tunnel lining segments reinforced with glass-FRP bars

A hybrid use of glass fiber-reinforced polymer (GFRP) reinforcement and fiber-reinforced concrete (FRC) could be a viable option for producing durable precast concrete tunnel lining (PCTL) segments. There is, however, a gap in the literature regarding the behavior of GFRP-reinforced FRC PCTL segments with typical amounts of reinforcement. This paper presents results obtained from both experimental and analytical studies on the behavior of GFRP-reinforced FRC PCTL segments under bending load (flexure). Four full-scale tunnel segment specimens were constructed and tested monotonically under three-point bending load. The influence of concrete type, reinforcement ratio, and tie configurations on the cracking behavior, deflection behavior, failure mechanism, load-carrying capacity, strain behavior, and deformability was evaluated. There is a limited analytical procedure available to predict the shear and flexural capacities of GFRP-reinforced FRC PCTL segments. Therefore, an analytical investigation was carried out in order to propose and evaluate different methods for predicting the flexural and shear capacities of such elements. The results indicate that the use of FRC significantly improved the cracking behavior and failure mechanism while also increasing the load-carrying capacity and deformability by 12% and 71%, respectively. Increasing the reinforcement ratio by 86% enhanced the post-cracking stiffness and peak load by 92% and 31%, respectively, while reducing the service-load crack width by 57%. According to the analytical investigation, the introduced direct method based on the stress–strain behavior of the FRC and the proposed simplified method based on ACI 440.1R-15 could predict the flexural capacity of GFRP-reinforced FRC PCTL segments with high accuracy. Furthermore, the method proposed to modify CAN/CSA S806-12, R2017 to consider the contribution of fibers in shear transferring mechanism yielded rational conservative values for the shear capacity of GFRP-reinforced FRC PCTL segments.

ПОРІВНЯЛЬНА ХАРАКТЕРИСТИКА ЗАСТОСУВАННЯ ПОЛІПРОПІЛЕНОВОЇ ФІБРИ ТА БАЗАЛЬТОВОЇ ФІБРИ У ДОРОЖНІХ БЕТОНАХ

The widespread use of fiber-reinforced concrete in construction is due to a number of their advantages. However, despite many years of research in this direction, scientists from different countries describe data obtained experimentally, the results of which differ. In some cases, the results obtained differ not only numerically, but also fundamentally. Basically, these are fibers of artificial origin, which are used for the manufacture of fiber-reinforced concrete. The most commonly used metal, polymer, basalt, glass fibers. To a lesser extent, carbon and polyamide fibers are used. It should be noted that the effectiveness of polyamide fiber is very doubtful, primarily because of the tendency of this type of fiber to swell. At present, the cost of carbon fiber is quite high, which is the main obstacle to its widespread use in concrete. Metal and glass fibers are subject to corrosion, and this adversely affects the properties of concrete. Since road and airfield concretes are used in aggressive conditions, these shortcomings do not allow the use of metal, glass, carbon and polyamide fibers in them. However, it follows from the analysis of the literature that the greatest controversy concerns the use of basalt and polypropylene fibers. The greatest controversy concerns the use of basalt and polypropylene fibers. There is no consensus which of these types of fiber is more effective for use in concrete. What amount of fiber should be introduced into the concrete mixture to achieve the maximum result is also unknown. This has led to the fact that basalt and polypropylene fibers are used very rarely in road and airfield concrete. The article presents an analysis of the results of the use of polypropylene and basalt fibers in concrete, obtained by researchers in different countries. The experimental data obtained by the authors are shown. The main attention is paid to the comparative efficiency of the use of these types of fibers. Strength, frost resistance and abrasion of road concrete are taken as criteria for evaluating the effectiveness. Quantitative intervals for the use of each type of fiber are established.

Experimental investigation of single and hybrid-fiber reinforced concrete under drop weight test

The use of fiber-reinforced concrete in various industries is developing due to the desired mechanical properties, light weight of the structure, good energy absorption capacity, and high initial strength under impact loads. In this study, the energy absorption and initial strength of reinforced concrete with Forta, Basalt, and Barchip fibers under penetration impact loading were investigated. To investigate the effect of fiber percentage on impact properties, 16 specimens were subjected to experimental tests in single and hybrid groups. Also, the fracture surface and the adhesion of fibers to fiber-reinforced concrete with degradation modes were evaluated. The results showed that the initial strength and energy absorption in hybrid-fiber reinforced concrete increased by 45.3 and 49.7%, respectively, compared to single fiber reinforced concrete. Also, by examining the fracture surface of the specimens, it was found that the adhesion between the two Basalt and Forta fibers to the base concrete is very desirable. However, the separation between Barchip fibers and concrete is high and reduces the efficiency of these fibers in reinforcing concrete.

Statistical analysis of an experimental database on residual flexural strengths of fiber reinforced concretes: Performance‐based equations

AbstractThe postcracking capacity of fiber reinforced concrete (FRC) mainly depends on the content, material, and geometry of the fibers considered. Even though the general influence of these factors on FRC behavior has been extensively addressed, the uncertainty of the FRC performance prediction along with the variability of the results still poses a challenging issue that needs to be solved to encourage the use of FRC for design and construction purposes. In this line, a database including the results of the flexural residual strength obtained from different experimental programs combined with the results of previous studies has been gathered and analyzed herein to obtain general correlations and trends providing additional information about the influence of the fibers in FRC behavior, these meant to serve for initial design stages (e.g., make decisions on the type and amount of fibers based on technical and economical requirements). The results are analyzed distinguishing between the fiber material, the fiber shape, the aspect ratio and tensile strength. The results presented herein may provide valuable information on the initial prediction of the residual strength of FRC to fully take advantage of the mechanical properties of the material.

Effect of steel fibers on the ultimate flexural behavior of dapped-end connections

Dapped-end connections in reinforced concrete structures work with high shear stresses and require dense reinforcement to ensure sufficient load-bearing capacity. In addition, under service loads, such connections typically develop inclined cracks that propagate from the re-entrant corner of the connection. In order to reduce the amount of reinforcement while enhancing the crack control, researchers have studied the use of fiber-reinforced concrete (FRC). However, while lab tests have shown that steel fibers can be very effective, there is a lack of rational mechanical models for FRC dapped-end connections. This paper proposes such a model based on kinematics, constitutive relationships, and equilibrium. The model accounts for two effects associated with the fibers: tension across the critical re-entrant corner cracks and enhanced ductility of the compression zones. FRC dapped-end tests from the literature are used to establish key modelling assumptions regarding the kinematics of the connections and to validate the proposed model. For 26 specimens, the average experimental-to-predicted strength ratio of the proposed model is 1.09 and the coefficient of variation is 10.6%. Using the kinematics-based model the effects of the fiber volumetric ratio and the shape of fibers on the ultimate flexural capacity of FRC dapped-end connections is investigated. For the studied cases, it was demonstrated that the effect of the end hooks can be significant, with the strength contribution of fibers more than doubled due to the hooks for a fiber volumetric ratio of 1.25%. The model is also used to investigate how the fibers can be used to reduce the amount of conventional reinforcement required against flexural failures.

Cost-oriented analysis of fibre reinforced concrete column-supported flat slabs construction

Fibre reinforced concrete (FRC) is increasingly being used in elements with high structural responsibility, the constructed FRC column-supported flat slabs (CSFSs, hereinafter) with partial or even total substitution of reinforcing steel bars being a supporting evidence for that statement. These pioneer experiences provide encouraging results with respect to resource optimization and construction time reduction without jeopardising the structural reliability. Despite such promising achievements, the use of FRC in CSFSs is still limited in the building sector. To provide an additional impulse for the use of FRC, a comprehensive comparison between FRC and traditional reinforced concrete (RC) technologies for CSFSs in terms of execution procedure and overall costs is needed. With this in mind, an industrial-oriented study was carried out with the main objective of elaborating a simplified method for the preliminary comparison of RC and FRC solutions. This method permits to assess the major amount of the required reinforcement (flexural reinforcement) followed by an evaluation of the time saving effect due to the partial or total substitution of reinforcing steel bars by fibres. For this purpose and for the sake of generalization, several databases were examined and 33 interviews with experts on in situ construction were conducted so that a wide range of productivity rates and other particularities could be identified. Based on the proposed method, a case study was analysed in order to indicate the potential direct costs (materials + labour) for a number of RC and FRC solutions using data from the examined databases and conducted interviews. The results reflect an increment of direct costs for both fibre and hybrid (fibre + reinforcing steel bars, HFRC) solutions; however, these increment can be compensated by the reduction of the construction period and, as a consequence, time-dependent costs (i.e., preliminaries, equipment costs, overheads, and finance costs). The outcomes of this research are meant to provide support to designers and construction planners with regard to the suitability of using FRC for CSFSs.

Fibre-Reinforced Concrete Is Sustainable and Cost-Effective for Water-Retaining Structures

Although fibre-reinforced-concrete (FRC) is increasingly used, it has been occasionally applied to water-retaining structures (WRSs), and no comprehensive design guidelines are currently available for the design of WRSs with FRC. A design methodology for such applications based on available recommendations and research has been applied to three reference scenarios representing a wide range of WRSs: a flood defence wall, a weir wall, and a swimming pool wall. For each of these scenarios, alternative designs using different FRC mix designs have been compared through the statistical analysis of several relevant parameters. This study confirms that the use of FRC significantly reduces reinforcement requirements when compared to conventional reinforced concrete solutions. Clear trends have been identified between the structural performance of the resulting WRS designs, the FRC mix characteristics and the fibre type and dimensions. This study has considered not only structural performance but also the total cost and environmental footprint per unit length of WRSs, and these considerations further the case for adoption of FRC in such applications. Overall, fibre dosages below 0.75% and 2% in volume for steel and synthetic fibres, respectively, can lead to WRS designs with lower cost and carbon footprint than their reinforced concrete counterparts.

Reliability-based assessment of the partial factor for shear design of fibre reinforced concrete members without shear reinforcement

Fibre reinforced concrete (FRC) is increasingly used for structural purposes owing to its many benefits, especially in terms of improved overall sustainability of FRC structures relative to traditional reinforced concrete (RC). Such increased structural use of FRC requires safe and reliable models for its design in ultimate limit states (ULS). Particularly important are models for shear strength of FRC members without shear resistance due to the potential of brittle failure. The fib Model Code 2010 contains a model for the shear strength of FRC members without shear reinforcement and the same partial factor accepted for RC structures is accepted for FRC elements. This approach, however, is potentially on the unsafe side since the uncertainties of some design-determining mechanical properties of FRC (i.e., residual flexural strength) are larger than those for RC. Therefore, in this study, a comprehensive reliability-based calibration of the partial factor γc for the shear design of FRC members without shear reinforcement according to the fib Model Code 2010 model is performed. As a first step, the model error δ is assessed on 332 experimental results. Then, a parametric analysis of 700 cases is performed and a relationship between the target failure probability βR and γc is established. The results demonstrate that the current model together with the prescribed value of γc = 1.50 does not comply with the failure probabilities accepted for the different consequences of failure of FRC members over a 50-year service life. Therefore, changes to the shear resistance model are proposed in order to achieve the target failure probabilities.

Structural response of a fibre reinforced concrete pile-supported flat slab: full-scale test

The total substitution of traditional reinforcement in the form of steel bars by fibres can be mainly found in elements with favourable boundary conditions and subjected to low-moderate load levels. However, the rigorous study of fibre reinforced concrete (FRC) and its potential fields of application over the last decades permitted this material to face structural application with greater responsibility in terms of structural integrity and mechanical capacity – construction of FRC flat slabs. This promising technology was used in a dozen buildings with recognition of positive outcomes with respect to the optimization of resources, reduction of execution time, and environmental impacts. Despite these achievements, the application of FRC in flat slabs is still limited in the building sector because of certain concerns of the material capacities, and existence of some aspects related both to service and ultimate limit states, which are still unclear. With this in mind, an extensive experimental programme was carried out and focused on the construction of a full-scale FRC flat slab and its loading protocol in order to analyse both crack and deflection patterns. Likewise, the structure was led to failure, which also allowed assessing both the bearing and deformability capacities as well as the fibre distribution and orientation. The results derived from this experimental program are expected to increase the confidence of designers and practitioners on the use of FRC as structural material for column-supported flat slabs.

Effect of Fibers on Durability of Concrete: A Practical Review.

This article reviews the literature related to the performance of fiber reinforced concrete (FRC) in the context of the durability of concrete infrastructures. The durability of a concrete infrastructure is defined by its ability to sustain reliable levels of serviceability and structural integrity in environmental exposure which may be harsh without any major need for repair intervention throughout the design service life. Conventional concrete has relatively low tensile capacity and ductility, and thus is susceptible to cracking. Cracks are considered to be pathways for gases, liquids, and deleterious solutes entering the concrete, which lead to the early onset of deterioration processes in the concrete or reinforcing steel. Chloride aqueous solution may reach the embedded steel quickly after cracked regions are exposed to de-icing salt or spray in coastal regions, which de-passivates the protective film, whereby corrosion initiation occurs decades earlier than when chlorides would have to gradually ingress uncracked concrete covering the steel in the absence of cracks. Appropriate inclusion of steel or non-metallic fibers has been proven to increase both the tensile capacity and ductility of FRC. Many researchers have investigated durability enhancement by use of FRC. This paper reviews substantial evidence that the improved tensile characteristics of FRC used to construct infrastructure, improve its durability through mainly the fiber bridging and control of cracks. The evidence is based on both reported laboratory investigations under controlled conditions and the monitored performance of actual infrastructure constructed of FRC. The paper aims to help design engineers towards considering the use of FRC in real-life concrete infrastructures appropriately and more confidently.

Utilizing concrete pillars as an environmental mining practice in underground mines

Ground control is an integral element of mine design and worker safety. The use of concrete pillars for underground mines is of paramount importance to maintaining the economic and operational security of structures. This paper deals with the use of fiber-reinforced concrete (FRC) as pillars via laboratory and field tests. The strength performance of prepared concrete reinforced with glass, polypropylene and polyacrylonitrile fibers was researched by a mechanical press and a computed tomography (CT) tool. Samples were tested for fiber volume fractions of 0, 0.4, 0.8 and 1.2 wt%, respectively. Results have indicated that, with the addition of fibers, the strength was improved first due to a bridging effect and then decreased due to a pull-out effect. Compared to the reference sample, the absorbed energy prevents FRC from deterioration by mechanisms of matrix cracking, fiber-matrix interface debonding and fiber rupture. The peak strains of FRC linearly rise with increasing fiber. The gray value distribution curves have also good correspondence with 2D CT pore and crack distributions, which reveal that gray value processing could depict the structural behavior of concretes reinforced with or without fiber. Theoretical analyses show that the pillar remains stable for sustainable mining. Besides, the location and size of FRC pillars are suitable for numerical calculations of the trial stope. The findings of this study can offer a key reference for the orebody pillar recovery in underground mines.

New Methodological Approach towards a Complete Characterization of Structural Fiber Reinforced Concrete by Means of Mechanical Testing Procedures

This work proposes a novel methodology for the complete characterization of fiber reinforced concrete (FRC). The method includes bending tests of prismatic notched specimens, based on the Standards for FRC, tensile and pure shear tests. The values adopted by the standards for designing FRC are the obtained from bending tests, typically fR3, even for shear and pure tension loading. This paper shows that the remaining strength of FRC, supplied by the fibers, depends on the type of loading. In the case of shear and tensile loading the prescriptions of the standards may be unsafe. In this work, the remaining halves of specimens subjected to bending test are prepared and used for shear and tension tests. This means significant savings in specimen preparation and a greater amount of information for structural use of FRC. The results provide relevant information for the design of structural elements of FRC compared with the only use of data supplied by bending tests. In the case of tensile tests, fLOP values are 42% of the strength of the equivalent bending results, being 31% the average reduction in remaining resistance in comparison with the bending test. Pure shear tests showed, for 0.5 mm shear displacement, that the shear resistance is greater than 160% of that expressed according to bending tests. In addition, a video-extensometry system was used to analyze the crack generation and cracking patterns. The video-extensometry applied to shear tests allowed the assessment of the sliding values and crack opening values at the crack discontinuity. These values may be quite relevant for the study of the FRC behavior when subjected to shear according to the shear-friction model theories.

Application of fiber-reinforced concrete in high-rise construction

In this research, we study the use of fiber-reinforced concrete, including steel fiber-reinforced concrete in the construction of outrigger floors of a high-rise building. The definition and classification of fiber-reinforced concrete as a construction material, the methodology for calculating high-rise buildings using fiber-reinforced concrete, the advantages and disadvantages of this composite material, and the specifics of its use are formulated. The domestic and foreign experience in use of fiber-reinforced concrete is analyzed. The rationale for its use on the experience of construction of residential building in seismically active regions is given. A comparative analysis of concrete and fiber concrete use in the outrigger floors’ construction is carried out.