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1
Wu, Li-Ming, Zi-Jian Wang, Yong-Zai Chang, Feng Gao, Bin Zhang, Yi Wu e Han-Xiu Fan. "Vibration Performance of Steel Fiber Concrete Tunnel Lining by Adjacent Tunnel Blasting Construction". Applied Sciences 13, n. 7 (26 marzo 2023): 4201. http://dx.doi.org/10.3390/app13074201.
Testo completoAbstract (sommario):
When constructing tunnels in mountainous areas, the drilling and blasting method is the most commonly used because of its economy. Ordinary reinforced concrete itself has defects such as poor crack resistance and brittleness. Therefore, when using the drilling and blasting method for ordinary reinforced concrete double-line tunnels, vibration phenomena will occur and cause cracks in the first-line tunnels, which will have adverse effects on the durability and safety of the tunnel. As a response, scholars have proposed the use of steel fiber-reinforced concrete as tunnel lining. In this paper, the LS-DYNA software is used to establish three models of plain concrete, ordinary concrete, and steel fiber-reinforced concrete, and numerical analysis is conducted with different amounts of explosives. The results show that the steel fiber-reinforced concrete tunnel lining has better performance than the other two concretes in tunnel construction.
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Lin, Yue Zhong. "On the Load of Reinforced Concrete Column by Seawater Corrosion". Advanced Materials Research 368-373 (ottobre 2011): 975–78. http://dx.doi.org/10.4028/www.scientific.net/amr.368-373.975.
Testo completoAbstract (sommario):
The reinforced concrete construction of port, wharf, inshore platform etc, which expose in the bad environment, can suffer influence of the corrosion and lower its safety. Particularly with the seawater corrosion, the reinforced concrete construction will suffer to break easily and result a bigness of loss. Therefore, the construction's safe and dependable increasingly become the important problem that study by people. The paper tested the load about 15 experiment columns of reinforced concrete, which are eroded in the artificial seawater corrosion, studied the load changing of reinforced concrete column which in different times of suffering decay. It afforded the basis for analysis the load of reinforced concrete construction in the corrosion environment.
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Gu, Chun Ping, Wei Sun, Li Ping Guo e Qian Nan Wang. "Ultrahigh Performance Concrete: A Potential Material for Sustainable Marine Construction in View of the Service Life". Applied Mechanics and Materials 438-439 (ottobre 2013): 108–12. http://dx.doi.org/10.4028/www.scientific.net/amm.438-439.108.
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Ultrahigh performance concretes (UHPC) are promising materials for the next generation infrastructures due to their superior mechanical properties and durability. In this paper, comparison studies were conducted to show the potential of UHPC for sustainable constructions in chloride environments in view of service life. For reinforced concrete, the service life was calculated with analytical solution of Ficks second law on diffusion. And for reinforced concrete with nonlinear initial chloride profiles and depth-dependent chloride diffusion coefficient, a numerical method based on the Crank-Nicholson numerical scheme was adopted to predict the service life. The results show that the reinforced concrete structures constructed and repaired with UHPC have much longer service life than that of normal concrete (NC) and high performance concrete (HPC). It hence needs less cost for maintenance and reconstruction, which fulfills the requirements of sustainable construction.
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Deaconu, O., e GC Chiţonu. "Using fibers in construction". IOP Conference Series: Materials Science and Engineering 1242, n. 1 (1 aprile 2022): 012013. http://dx.doi.org/10.1088/1757-899x/1242/1/012013.
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Abstract This article is an overview about alternative solutions for reinforced concrete by using different types of fibers. The use of fiber reinforced concrete when is compared to the conventional reinforced concrete solutions. This study has taken in consideration structural performance and the total cost. The use of fibers or dispersed reinforcement also improves some of the characteristics of concrete, such as those related to: cracking, freezing, durability, erosion of ordinary or marine water, wind erosion, permeability, etc. In order to correct to a large extent, the unfavorable characteristics of the reinforced concrete, in the mass of the fresh concrete various types of fibers can be mixed and incorporated in the use of concrete with dispersed reinforcement. As materials often used as fibers, the most commonly are: hooked-end steel (steel fibers), straight polypropylene and straight polyolefin, glass fiber, carbon fiber, aramid fiber, natural hemp fibers, jute, hair, straw, etc.
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FOTIN, O. V. "Construction of Precast Reinforced Concrete". Stroitel'nye Materialy, n. 4 (2023): 32–34. http://dx.doi.org/10.31659/0585-430x-2023-812-4-32-34.
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Akramov, Khusnitdin, Rakhimbay Yusupov e Jasurbek Ergashov. "Efficient technology of basalt fiber-reinforced concrete for use in monolithic construction". E3S Web of Conferences 452 (2023): 06003. http://dx.doi.org/10.1051/e3sconf/202345206003.
Testo completoAbstract (sommario):
The development and production of basalt fiber-reinforced concrete have been carried out on a large scale recently, driven by the efficiency of using basalt fibers as a micro-reinforcing additive in cement-based concretes. For the successful application of basalt fiber-reinforced concrete in monolithic construction, there must be an accessible and efficient technology for commonly used concrete compositions. This paper presents the results of an analysis of foreign literature sources, which conclude that new experimental research is needed to improve the compositions and technology of basalt fiber-reinforced concrete using local construction materials. The article provides the results of such research and recommendations for an efficient basalt fiber-reinforced concrete technology.The conducted research has shown that introducing basalt fiber into the composition of heavy concrete according to the proposed technology contributes to a 15% increase in compressive strength compared to similar concrete without micro-reinforcement. Additionally, it is possible to save up to 10% or more on cement consumption.
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Kurpińska, Marzena, Beata Grzyl e Adam Kristowski. "A Study on Fibre-Reinforced Concrete Elements Properties Based on the Case of Habitat Modules in the Underwater Sills". Polish Maritime Research 27, n. 1 (1 marzo 2020): 143–51. http://dx.doi.org/10.2478/pomr-2020-0015.
Testo completoAbstract (sommario):
AbstractHydrotechnical constructions are mostly objects functioning in extreme conditions and requiring a custom-made construction project. In the case of using prefabricated elements, it is required to develop production, transport, assembly, conservation and repair technology. Concerning the problem of concrete cracks, modern repair systems allow positive effects to be achieved in many cases of concrete elements repair. In this work an attempt has been made to assess the properties of concrete, situated in the Baltic Sea environment, in which traditional rebar was partly replaced by dispersed fibre-phase. Fibre-reinforced concrete belongs to the group of composite materials. The presence of fibres helps to increase the tensile strength, flexural strength and resilience and also prevents the appearance of cracks. In the given paper we will also discuss basic parameters of steel and polymer fibres and the influence of both types of fibres on the maturing and hardened concrete. In this work special attention has been paid to the advantages of polypropylene and polymer fibres with regard to commonly-known steel fibres. The use of synthetic fibres will be advantageous in constructions where the reduction of shrinkage cracks and high resilience are essential. On top of that, the use of synthetic fibres is highly recommended when constructing objects that will be exposed to the impact of an aggressive environment. Undoubtedly, polymer fibres are resistant to the majority of corrosive environments. Fibre-reinforced concretes are a frequently implemented construction solution. The possibility of concrete modification allows the emergence of new construction materials with improved physical-mechanical properties, under the condition of being applied relevantly.
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Vogel, Filip. "Production and Use of the Textile Reinforced Concrete". Advanced Materials Research 982 (luglio 2014): 59–62. http://dx.doi.org/10.4028/www.scientific.net/amr.982.59.
Testo completoAbstract (sommario):
This article discusses about the textile reinforced concrete. The textile reinforced concrete is a new material with great possibilities for modern construction. The textile reinforced concrete consists of cement matrix and textile reinforcement of high strength fibers. This combination of cement matrix and textile reinforcement is an innovative combination of materials for use in the construction. The main advantage of the textile reinforced concrete is a high tensile strength and ductile behavior. The textile reinforced concrete is corrosion resistant. With these mechanical properties can be used textile reinforced concrete in modern construction.
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Schmeckpeper, Edwin R., e Charles H. Goodspeed. "Fiber-Reinforced Plastic Grid for Reinforced Concrete Construction". Journal of Composite Materials 28, n. 14 (agosto 1994): 1288–304. http://dx.doi.org/10.1177/002199839402801401.
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Ischenko, Aleksandr, e Anastasia Borisova. "Application of fiber-reinforced concrete in high-rise construction". E3S Web of Conferences 164 (2020): 02005. http://dx.doi.org/10.1051/e3sconf/202016402005.
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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.
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Alawlaqi, Hashed. "COMPARATIVE ANALYSIS BETWEEN RC CONSTRUCTION AND LIGHTWEIGHT STEEL CONSTRUCTION". InterConf, n. 13(109) (20 maggio 2022): 7–13. http://dx.doi.org/10.51582/interconf.19-20.05.2022.001.
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The construction of lightweight steel has been remarkable in multiple applications including residential, commercial and industrial buildings. Many studies focus on the advantages of building lightweight from several aspects. This article highlights a comparative study of the construction of lightweight steel and construction by reinforced concrete in technical and economic aspects such as the weight of the building, construction time and construction conditions. In this article, the construction of lightweight steel appears to be the big difference in the weight of the building compared with the construction of the reinforced concrete and also by construction duration, which the construction needs from start to finish. It is also illustrated that direct and non-direct cost for light-weight steel construction is less than the cost of construction with reinforced concrete.
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Makunza, John. "Application of Mangrove Timber in Reinforcing Concrete". Tanzania Journal of Engineering and Technology 42, n. 3 (30 settembre 2023): 16–24. http://dx.doi.org/10.52339/tjet.v42i3.742.
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Use of mangrove timber beams for supporting floor slabs in historic buildings in Zanzibar Stone Town is still applied although the available structural data on mangrove timber is inadequate. This concern has called for an investigation on the structural properties of mangrove timber, so that the information obtained could help to establish the structural strength of the existing floor slabs in historic buildings. Hence, mangrove timber specimens were sampled from Zanzibar, and tested in the laboratory for their strengths in tension, compression and shear. The test results showed that mangrove is a hardwood timber of strength class D70, the highest rank of timber classification. Also, concrete beam specimens reinforced with mangrove timber rods, and others reinforced with structural steel were studied. The obtained test results showed that beams reinforced with mangrove timber rods with enlarged ends performed better than those reinforced with uniform mangrove rods. The strength of the beams reinforced with mangrove timber was found to be 50% of the beams reinforced with steel bars, implying that mangrove timber can be used to reinforce concrete beams.
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Pasek, Jan, e Ludek Vejvara. "Degradation of the Building Structures due to Carbonation of Concrete". Advanced Materials Research 1020 (ottobre 2014): 37–42. http://dx.doi.org/10.4028/www.scientific.net/amr.1020.37.
Testo completoAbstract (sommario):
Carbonation of the concrete is a process influencing acceleration of the aging of concrete during the time, at reinforced concrete structures it is usually accompanied with corrosion of the reinforcement and disturbances of the covering layer of the concrete. Its consequence is decrease of the static reliability of the reinforced concrete building structures. Carbonation of the construction from common concrete and lightened concrete causes just in the CR damage worth billions of Czech Crowns every year. The paper refers about seriousness of the current technical state of reinforced concrete structures and influence of the most important factors on the course of their degradation caused by carbonation and specifies principles for designing new reinforced concrete constructions.
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Zhao, Dong Qi, Yi Jun Tang, Hui Li, Gui Feng Song e Feng Ling Guan. "The Application Research of Reinforced Concrete Multi-Ribbed Hollow Composite Slab in the Road Slab Culvert". Advanced Materials Research 368-373 (ottobre 2011): 307–11. http://dx.doi.org/10.4028/www.scientific.net/amr.368-373.307.
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Reinforced concrete cover in the road culvert cover design, in order to facilitate the construction, usually using precast reinforced concrete solid slab, but the overall cost is not low. This article researched a reinforced concrete multi-ribbed hollow composite slab, it based on the theory of reinforced concrete multi-ribbed slab structures, using a precast reinforced concrete ribbed slab as the bottom die, then poured reinforced concrete beams and panels rib ,and them constituted a whole stack of reinforced concrete ribbed hollow slab. This kind of cover, compared with the precast reinforced concrete solid cover, is not only good mechanical properties, high integrity, but also saving concrete, steel, and bottom slab appeared smooth and fine, lower construction cost.
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Tran, Vu An, Le Anh Tuan Bui, Duc-Cuong Nguyen e Hoang Anh Nguyen. "Effect of fiber type on performance of fiber reinforced concrete applied for hydraulic construction". CTU Journal of Innovation and Sustainable Development 16, Special issue: ICCEE (9 maggio 2024): 51–57. http://dx.doi.org/10.22144/ctujoisd.2024.281.
Testo completoAbstract (sommario):
This study aims at evaluating effect of fiber types on comprehensive property of a practical fiber reinforced concrete (FRC) applied for hydraulic construction. Three fiber types including polypropylene, glass, and steel fiber were used to replace concrete volume at 0.3 vol.%. Experimental results illustrated that when compared with the reference concrete, the fiber reinforced concretes with steel or glass fiber had comparable or slight changes on the fresh properties. But, addition of polypropylene fiber induced the fresh FRC with decreased slump flow and significantly increased air entrained volume. Although using various types of fibers led to unbeneficial effect on the compressive strengths of the FRCs, presence of fiber induced the FRCs with significant enhancements on the flexural strength, drying shrinkage, and water absorption and slightly increased UPV at 28 days. In this study, steel fiber was considered as the best choice for improving the mechanical properties of the hardened concrete while, as the volume stability and durability performance of the concrete were primarily considered, polypropylene seemed to be a preferable selection. According to standardized requirements, all concrete proportions were in classification of M40(28)-M45(28), being assigned to concretes suitably applied for widespread on-site hydraulic constructions.
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Sagaidak, A. I. "Technologies for acoustic emission monitoring of concrete and reinforced concrete structures". Bulletin of Science and Research Center of Construction 38, n. 3 (29 settembre 2023): 62–81. http://dx.doi.org/10.37538/2224-9494-2023-3(38)-62-81.
Testo completoAbstract (sommario):
Introduction. The acoustic emission (AE) method is successfully used for diagnostics and monitoring in various industries including oil and gas, nuclear, aerospace as well as in welding processes and structural corrosion. However, inspection of reinforced concrete structures seldom involves the AE method. The main reason behind is the lack of regulatory documents and specific control procedures.State Standard R 59938-2021 “Concretes. Acoustic emission testing method” was issued in 2021. Over the past few years, new data on effective application of the acoustic emission method for non-destructive testing and technical diagnostics of the building structures have been obtained. The studies were carried out on specimens and fragments of structures (reinforced concrete beams, concrete samples in the form of slabs, wall panels, etc.) in NIIZHB named after A.A. Gvozdev. The studies were conducted on the structures under construction at Kursk NPP-2.Aim. To present the results of the recently developed methods of technical diagnostics and non-destructive AE testing of concrete and reinforced concrete structures.Materials and methods. The investigations were carried out on concrete and reinforced concrete specimens made of both normal (B15–B40) and high-strength (B60–B100) concrete. A number of beams were made of fiber concrete. Structures were tested in the power unit. AE monitoring of concrete hardening involved concrete mixtures made of heavy, fine-grained, cement concrete with mineral and chemical additives. Concrete hardening was investigated remotely, with online data transmission.Results. Based on the results of the conducted study, the technologies for acoustic emission monitoring and technical diagnostics of the structures under construction and in operation have been developed.Conclusions. The given acoustic emission technologies can be used for monitoring and technical diagnostics of structures under construction and in operation. The implementation of technologies in construction will lead to the increase in safety and reliability of building structures due to the introduction of acoustic emission monitoring.
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Frolov, Kirill E. "Experimental studies of reinforced concrete structures of hydraulic structures strengthened with composite materials". Structural Mechanics of Engineering Constructions and Buildings 15, n. 3 (15 dicembre 2019): 237–42. http://dx.doi.org/10.22363/1815-5235-2019-15-3-237-242.
Testo completoAbstract (sommario):
Relevance. During the operation process (first of all, long-term operation) of hydraulic structures, it becomes necessary to strengthen their reinforced concrete structures. In recent years, reinforcement of reinforced concrete structures has been used in industrial and civil construction by external reinforcement systems made of composite materials (for example, carbon materials). In this case, in hydraulic engineering construction there are only isolated examples of such amplification. Aims of research. Experimental studies of reinforced concrete structures of hydraulic structures strengthened with external reinforcement from carbon materials presented in the article were carried out in order to substantiate the use of external reinforcement based on carbon materials (tapes and lamellae) to reinforce reinforced concrete structures of hydraulic structures. Methods. In order to carry out an experimental study of the strengthening of hydraulic structures with external reinforcement, reinforced concrete models of hydraulic structures of a beam type were made of carbon materials. At the same time, reinforced concrete structures with characteristic features of hydraulic structures, such as low concrete classes and reinforcement percentages (less than 1%), were adopted for modeling. Reinforced concrete models were strengthened with carbon ribbons and lamellae. Experimental studies were carried out under the action of a bending moment using standard methods. The increase in the strength of reinforced concrete structures due to their reinforcement with carbon ribbons and lamellae was determined. Results. The results of experimental studies of the strength of reinforced concrete structures of hydraulic structures without reinforcement and reinforced with carbon ribbons and lamellae under the action of a bending moment are presented. On the basis of the comparison carried out, the increase in the strength of reinforced concrete structures is determined by their reinforcement with carbon ribbons and lamellae.
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Li, Zhong Long, Hong Lin Wu, Zhen Yu Liu, De Jian Xu, Hong Jiang Gu e Xiao Di Zhu. "Ultimate Flexural Bearing Capacity Research Based on Carbon Fiber Sheet to Reinforce Rough Sleeper Beam". Applied Mechanics and Materials 226-228 (novembre 2012): 1766–70. http://dx.doi.org/10.4028/www.scientific.net/amm.226-228.1766.
Testo completoAbstract (sommario):
In this paper, it makes a preliminary study on the material of carbon fiber sheet to reinforce rough sleeper beam in order to enhance the magnitude of ultimate flexural bearing capacity. Considering the actual construction technology and environment, four reinforced concrete sleeper beams are used to experiment simulation to study the influence of carbon fiber sheet to ultimate flexural bearing capacity of reinforced concrete structures. Experiment results show that pasting two layers of carbon fiber sheet under reinforced concrete beam can have about a 25% increase in flexural bearing capacity.
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Chyzhov, Sergey, Yekaterina Shestakova, Elbek Yakhshiyev e Anatoliy Antonyuk. "Design principles of prestressed concrete span coponents in the process of despersed reinforcement". Proceedings of Petersburg Transport University, n. 2 (20 giugno 2017): 343–53. http://dx.doi.org/10.20295/1815-588x-2017-2-343-353.
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Objective: To determine the calculating justification methods of fibre-reinforced spans and scientific evidence of the structural method of dispersed reinforced concrete constructions in drily-hot climate for high-speed mainline railroads, to reveal advantages connected with fibre application in the process of construction, to determine the ways of total costs reduction while providing qualitative reliability characteristics of spans under construction. Methods: Comparative analysis, mathematical modeling. Results: Calculating principles of fibre-reinforced elements of spans were specified. The study was aimed at application solving, with regard to climate in Uzbekistan, and determined the parameters of Lр = 66 m fibre-reinforced concrete span, specified by the objective of scientific study concerning the bridgework for high-speed mainline railroad. Practical importance: Methodological foundation for fibre-reinforced concrete spans calculation was developed.
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Khechinov, Yu E. "Disperse-reinforced concrete in hydrotechnical construction". Hydrotechnical Construction 25, n. 9 (settembre 1991): 575–81. http://dx.doi.org/10.1007/bf01836484.
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Grima López, Rosa, Antonio Aguado de Cea e Josep Gómez Serrano. "Gaudí and Reinforced Concrete in Construction". International Journal of Architectural Heritage 7, n. 4 (gennaio 2013): 375–402. http://dx.doi.org/10.1080/15583058.2011.632470.
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Alrshoudi, Fahed. "Behaviour of Textile-Reinforced Concrete Beams versus Steel-Reinforced Concrete Beams". Advances in Civil Engineering 2021 (19 febbraio 2021): 1–8. http://dx.doi.org/10.1155/2021/6696945.
Testo completoAbstract (sommario):
There has been a rising interest in utilising textile reinforcement such as carbon tows in constructing concrete components to enhance the performance of conventional reinforced concrete. Textile-reinforced concrete (TRC) has been used as a construction material mostly as primary reinforcement. However, the structural performance of TRC members has not been investigated in depth. Therefore, to better understand TRC beams’ behaviour under bending load, a widespread experimental investigation was conducted. The results of tensile stress-strain, load-deflection, moment-curvature, and tension stiffening behaviours of TRC beams were associated with conventional steel-reinforced concrete (SRC) beams. In this study, the four-point bending and tensile strength tests were performed. The results revealed that, unlike the stress-strain behaviour observed in steel, textile reinforcement does not exhibit yielding strain. The flexural behaviour of TRC beams shows no similarity to that of SRC beams at postcracking formation. Besides, the moment capacity and tension stiffening of TRC beams were found 56% and 7 times higher than those of SRC beams, respectively. Therefore, in light of these results, it can be said that TRC beams behaviour differs from that of SRC beams.
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Hou, Xin Ning, e Yong Sheng Zhang. "Talking about the Importance of the Construction of the Reinforced Protective Layer Control". Applied Mechanics and Materials 256-259 (dicembre 2012): 859–62. http://dx.doi.org/10.4028/www.scientific.net/amm.256-259.859.
Testo completoAbstract (sommario):
Reinforced protective layer to ensure the durability of reinforced concrete structures important tectonic structures plays a vital role. Reinforced concrete reinforced the lack of a protective layer will affect the durability of the components, in serious cases, the member failure early. Meticulous construction, requires not only the structure of acceptable quality, also require durability is better. This paper tries to force mechanism of reinforced concrete together, combined with years of construction practice, to talk about the importance of control in the construction of reinforced protective layer.
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Buhaievskyi, Serhii, e Iryna Nazarenko. "Application of self-compacting concrete for the construction and restoration of reinforced con-crete bridges". Bulletin of Kharkov National Automobile and Highway University 1, n. 103 (28 dicembre 2023): 183. http://dx.doi.org/10.30977/bul.2219-5548.2023.103.1.183.
Testo completoAbstract (sommario):
Problem. Nowadays, the cast reinforced concrete spans are widely used in the construction and rehabilitation of bridges. These structures are also proposed for small and medium spans by the DerzhDorNDI named after M.P. Shulgin. One of the disadvantages of the cast reinforced concrete slab spans is its heavy weight. Using polystyrene void foams allows to reduce the consumption of concrete and the own weight of the span structure to 30-45%. Self-compacting concrete belongs to the new generation of concrete and can be used in modern innovative construction including bridge designing. The manufacturing of the cast reinforced concrete slab spans using self-compacting concrete allows to significantly speed up the concreting process due to its placing in one stage. Goal. The purpose of these research is to reflect on the light-weight constructions and concreting process of the cast reinforced concrete slab spans using self-compacting concrete. Methodology. Research is performed using the analysis of the scientific literature and European regulations, systematization and unification of the requirements to the self-compacting concrete components. Results. A method of manufacturing the cast reinforced concrete slab spans using self-compacting concrete and polystyrene void foams allows to significantly speed up the concreting process, reduce the time spent on forming the upper surface of the span structure, reduce the consumption of concrete and the own weight of the span structure to 30-45%. Originality. He article presents the method of manufacturing the light-weight constructions using not only self-compacting concrete, but also polystyrene void foams. Practical value. The presented type of slab spans has a lot of the advantages: ease of manufacture using widespread formwork, overall integrity of the structure, significant torsion stiffness, provision of spatial work, lack of joints, small area of open parts of concrete, etc. We are striving to familiarize a wide circle of bridge engineers with distinctive features and advantages of the light-weight constructions using self-compacting concrete and polystyrene void foams and getting developments into actual practical use.
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Setyowati, Martha. "PERKEMBANGAN PENGGUNAAN BETON BERTULANG DI INDONESIA PADA MASA KOLONIAL (1901-1942)". Berkala Arkeologi 39, n. 2 (5 novembre 2019): 201–20. http://dx.doi.org/10.30883/jba.v39i2.468.
Testo completoAbstract (sommario):
The discovery of reinforced concrete became a major breakthrough in modern construction technology in the early 20th century. In five decades reinforced concrete has developed rapidly and was used in almost all parts of the world. Reinforced concrete was first introduced in Indonesia during the colonial period. The used of reinforced concrete increased along with the construction growth in the Dutch East Indies. The used of reinforced concrete between 1901 and 1942 can be seen from the buildings and infrastructure that still exist today. However the development of reinforced concrete in Indonesia during colonial period not widely explored yet. Because of that this study aims to provide an overview of the development of reinforced concrete used during the colonial period using archaeological data and supported by historical data. This research uses secondary data sources obtained through literature study. Based on this research it can be concluded that the development of the reinforced concrete used in the colonial period showed the progress of construction technology as well as economic and social conditions at that time.
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Synkovska, Olena, e Andrii Ihnatenko. "PLANNING OF EXPEREMENTAL RESEARCH СYLINDRICAL LOAD-BEARING SUPPORT OF BUILDINGS". Modern technology, materials and design in construction 32, n. 1 (28 giugno 2022): 49–54. http://dx.doi.org/10.31649/2311-1429-2022-1-49-54.
Testo completoAbstract (sommario):
A new construction of cylindrical load-bearings support of buildings is offered, that has an alternative reinforced concrete and with using of several different ways of indirect use. Shell is introduced for the view of the new construction sieved sheet, that is created from non-exit technology using imbibitions and extrusion of the steel sheet itself..
For gaining the maximum amount of advantages and disadvantages from the introduced us reinforced concrete elements with mesh shell. The most efficient is method is a comprehensive research of introduced construction, as well as an already known researches of reinforced concrete with mesh shell. That's why, when we are calculating labor, material intensity and cost of these experimental researches. Keep in mind that this is promtly and relevant researches. In this work while planning the experiment some things were taken to consideration: best way for the construction to give the weight to reinforced concrete part and how to define the level of influence of factors like this: cyclicity, eccentricity, type of shell, thickness and diameter of shell, durability of concrete and deformation of reinforced concrete constructions.
So, to get the most reliable information from these researches with minimal waste, we need to optimize parameter of load-bearing capacity and deformation and parameter of restriction-destruction. A calculation was made for optimizing the experiment about minimal amount of researches and conditions where they are done, and that is enough to salve the problem precisely.
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SOPILNIAK, А. М., V. V. KOLOKHOV, V. V. SHLIAKHOV, A. A. TYTIUK e А. S. SMYRNOV. "IMPROVEMENT OF REINFORCED CONCRETE ENVELOPES FOR LOW-RISE BUILDINGS". Ukrainian Journal of Civil Engineering and Architecture, n. 2 (9 luglio 2022): 92–101. http://dx.doi.org/10.30838/j.bpsacea.2312.260422.92.856.
Testo completoAbstract (sommario):
Problem statement. A perspective direction to ensure modern requirements for thermal protection of buildings without a significant increase in material and labor resources and, most importantly, cost is the application of multilayer reinforced concrete panels, using efficient thermal insulation. In 2012−2013, some experience in the use of modern prefabricated three-layer reinforced concrete panels in cottage construction is obtained. This experience has revealed some shortcomings of such panels using on the building site and the need to modernize their production technology. In addition, improvements in joint construction and the use of aggregate concrete from recycled concrete scrap are relevant. The purpose of the article is to develop constructive solutions for low-rise buildings using multilayer reinforced concrete panels with effective insulation and to determine directions for further modernization of the developed structures. Conclusions. The developed constructive solutions for low-rise construction of houses using multilayer reinforced concrete panels with effective insulation are modern and exceed the standards for heat saving and are relevant today given the cost of energy. The developed constructive solutions of wall panels together with interpanel seams construction from the point of view of thermal homogeneity are the most homogeneous today in comparison with analogs. The panel joints construction is considered taking into account the conditions of durability and thermal conductivity. The directions of the developed constructions further modernization for wall panels and floor slabs are defined. The developed constructive solutions for panel house-building and factory production of wall panels and floor slabs reduce the time and cost of construction.
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Zuo, Yong Zhi, Jing Bo Sun, Qiao Zhi Lu, Hai Wen Teng, Tao Zhang e Huan Liu. "Case Fuzzy Retrieval of Reinforced Concrete Structures Accidents Based on CBR". Applied Mechanics and Materials 501-504 (gennaio 2014): 568–73. http://dx.doi.org/10.4028/www.scientific.net/amm.501-504.568.
Testo completoAbstract (sommario):
In order to help engineers to better learn from accidents of reinforced concrete structures, accident identification and processing method, this article introduced the ideas of CBR to the accident case retrieval methods of reinforced concrete structures. At the same time, the fuzzy retrieval and knowledge index model of reinforced concrete structure accidents are presented. According to the approximate extent of construction conditions, the approximation of construction are determined, and similar cases with the current engineering cases then retrieved through the case of reinforced concrete structures, which the designer or construction workers can learn from.
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Kieslich, Hubertus, e Klaus Holschemacher. "Composite Constructions of Timber and High-Performance Concrete". Advanced Materials Research 133-134 (ottobre 2010): 1171–76. http://dx.doi.org/10.4028/www.scientific.net/amr.133-134.1171.
Testo completoAbstract (sommario):
Currently Timber-Concrete Composite (TCC) Constructions are often applied for strengthening existing timber beam slabs. The load bearing capacity of the composite construction is primarily affected by the material properties of the timber beam and the concrete slab. But the type of bond between both parts is also of high importance. The concrete slab has to perform several tasks, not only in load carrying direction of the ceiling but also perpendicular to the direction of span or for stiffening the whole building. These tasks will be pointed out in this paper. Furthermore the working process (easy workable mixture and exchange of conventional reinforcement) and the dead load of the construction are of particular interest in the field of redevelopment. Several innovative concretes have been verified for the use in TCC constructions. Regarding their fresh and hardened concrete properties, they all can be described as High Performance Concretes (HPC). In this paper Self Compacting Concrete (SCC), Fiber Reinforced Concrete (FRC), Structural Lightweight Concrete (SLWC), High Strength Concrete (HSC) or combinations of them will be focused. Especially the advantages but also the disadvantages of innovative concretes for the use in TCC will be presented as well as the results of some experimental investigations.
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Purba, Burt K., e Aftab A. Mufti. "Investigation of the behavior of circular concrete columns reinforced with carbon fiber reinforced polymer (CFRP) jackets". Canadian Journal of Civil Engineering 26, n. 5 (1 ottobre 1999): 590–96. http://dx.doi.org/10.1139/l99-022.
Testo completoAbstract (sommario):
Recent advancements in the fields of fiber reinforced polymers (FRPs) have resulted in the development of new materials with great potential for applications in civil engineering structures, and due to extensive research over recent years, FRPs are now being considered for the design of new structures. This study describes how carbon fiber reinforced polymer jackets can be used to reinforce circular concrete columns. Fibers aligned in the circumferential direction provide axial and shear strength to the concrete, while fibers aligned in the longitudinal direction provide flexural reinforcement. Prefabricated FRP jackets or tubes would also provide the formwork for the columns, resulting in a decrease in labor and materials required for construction. Also, the enhanced behavior of FRP jacketed concrete columns could allow the use of smaller sections than would be required for conventionally reinforced concrete columns. Furthermore, FRP jacket reinforced concrete columns would be more durable than conventionally reinforced concrete columns and therefore would require less maintenance and have longer service life.Key words: bridge, carbon, column, concrete, confinement, fiber reinforced polymer, jacket, retrofitting, seismic, strengthening.
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Davidyuk, Artem, e Igor Rumyantsev. "Quality control of high-performance concrete in high-rise construction during operation". MATEC Web of Conferences 170 (2018): 01035. http://dx.doi.org/10.1051/matecconf/201817001035.
Testo completoAbstract (sommario):
With onset of the XXI century, the demand for construction of high-rise buildings with the load-bearing framework made of high-performance cast-in-situ concrete has increased many-fold in the construction sector. Specific features of the high-performance concrete of bearing structures in the situation of real operation of high-rise buildings are continuously studied by scientists and specialists all over the world, and regulatory and methodological documents are being complemented and adjusted. High-performance concretes and structures made of them possess some specific features that should be taken into account in quality control. The methods of concrete inspection and concrete strength evaluation described in GOST 18105 “Concretes. Guidelines on Testing and Evaluation of Strength” and GOST 22690 “Concretes. Evaluation of Strength by Mechanic Non-Destructive Test Methods” were written when precast reinforced concrete was predominantly used in the construction sector and were limited to the functions of intra-factory quality control of reinforced concrete products. At present, instruments for non-destructive testing using indirect methods are usually calibrated with the help of local destructions, as a rule, a pull out or rib shear test. The said methods are in fact indirect since they indicate the force of destruction of the surface layer of a structure.
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Zhao, Jun, e Wei Wei Jia. "Random Analysis of RC Structures during Construction". Applied Mechanics and Materials 105-107 (settembre 2011): 981–85. http://dx.doi.org/10.4028/www.scientific.net/amm.105-107.981.
Testo completoAbstract (sommario):
Since accidents of reinforced concrete structure occur frequently, it is a key issue to ensure the safety and stability of structures during construction. In this paper, each construction cycle was divided into four stages using discrete time method of freezing to establish the computational model. According to random theory, with the characteristics of reinforced concrete structures during construction, a series of recurrence equation is built by stochastic finite element method during construction. Based on a random analysis of practical engineering, the random response time-varying rule of reinforced concrete structure is obtained during construction. The results show that the construction process of reinforced concrete structure could be simulated well based on perturbation stochastic finite element method .Both the mean and standard deviation of deflection of mid-span could be obtained precisely.
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Y M, Dr Vijaya Kumar, e Dr Meena Y R. "Bamboo Reinforced Concrete". International Journal for Research in Applied Science and Engineering Technology 10, n. 9 (30 settembre 2022): 943–47. http://dx.doi.org/10.22214/ijraset.2022.46771.
Testo completoAbstract (sommario):
Abstract: This study presents the evaluation of the feasibility of the use of Bamboo as reinforcement material. Here Bamboo was used as a reinforcing material. Now a day’s concrete is used as the basic materials for construction works. Concrete is good in compression but weak in tensile strength. So, steel is used as reinforcement in the concrete to achieve the tensile strength. Problems encountered with the use of steel are high in cost, corrosion, etc. The main obstacle for the application of Bamboo as a reinforcement is the lack of sufficient information about its interaction with concrete strength and durability.
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Tanveer Majid, Muhammad. "The effect of twisted polymer fibers on the physical and mechanical properties of C35 concrete". Journal of Research in Science, Engineering and Technology 7, n. 4 (29 settembre 2020): 11–15. http://dx.doi.org/10.24200/jrset.vol7iss4pp11-15.
Testo completoAbstract (sommario):
Concrete as the most used material, is known as an integral part of construction. So far, many studies have been done in the field of improving the quality of concrete that most of them have examined change in concrete mix design; however, the use of additives and also replacing commonly used materials in concrete with new materials always has been considered. Today, different fibers, especially Forta fibers, are used. In this study, experiments on Forta fiber- reinforced concrete are described. The concrete mixing design and Forta fiber properties are also briefly described. The comparison between the results of the tests showed that Forta fiber- reinforced concretes have more bending strength and modulus of elasticity than normal and ordinary concretes.
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Deineko, Andrei V., Valentina A. Kurochkina, Irina Yu Yakovleva e Aleksandr N. Starostin. "Design of reinforced concrete slabs subject to the construction joints". Vestnik MGSU, n. 9 (settembre 2019): 1106–20. http://dx.doi.org/10.22227/1997-0935.2019.9.1106-1120.
Testo completoAbstract (sommario):
Introduction. When erecting monolithic reinforced concrete floor slabs, a necessity of construction joints arises. The construction joints are the areas of structural weakening. The construction practice shows that the compliance with the correct technology of the construction joint arrangement is not a sufficient condition to ensure the strength balance of reinforced concrete floor slabs. As a result, the stress-deformation state calculated on the assumption of the concrete slab solidity deviates from the actual state. The relevance of the task is determined by the fact that the conformity of design and actual characteristics of the in-situ reinforced concrete structures as a whole depends on the correct calculations of construction joints.
Materials and methods. The problem of implementing the construction joints in the monolithic floor slabs was considered by way of example of a residential building under construction. In the course of construction, pre-construction land surveys were carried out at the areas of the construction joint arrangement. Calculations of reinforced concrete structures using finite element method (FEM) were also performed.
Results. As a result of the study, the actual deflections of the floor slabs were measured at the areas of the construction joints and FEM calculations were made on the same floor slabs, both those erected at once and those erected in stages subject to the construction joints. The difference between the calculated and actual deflections is conditioned upon the inaccurate conformity between the mathematical model and the real reinforced concrete structure, its erection and maintenance conditions. It should be noted that the deflection of horizontal reinforced concrete structures is only one of the stress-deformation state parameters that can be measured better than the others. It is shown that if the deflection of a real reinforced concrete structure does not correspond with the design estimation, the other stress-deformation state parameters will differ from the design estimation as well.
Conclusions. The influence of joints can be taken into account in the scope of FEM computer-aided calculations with the explicit reproduction of the structure erection by pouring concrete, using engineering approach to the consideration of nonlinearity on the basis of the introducing reduction coefficients to the reinforced concrete effective modulus of elasticity. Solid composition modeling of reinforced concrete provides the best possibilities on taking all sorts of nonlinearity manifestations into consideration.
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Rubin, Oleg D., Sergey E. Lisichkin e Oksana V. Zyuzina. "Experimental studies of the stress-strain state of reinforced concrete structures strengthened by prestressed basalt-composite rebar". Structural Mechanics of Engineering Constructions and Buildings 17, n. 3 (24 ottobre 2021): 288–98. http://dx.doi.org/10.22363/1815-5235-2021-17-3-288-298.
Testo completoAbstract (sommario):
Relevance. In recent years, composite materials have become widespread in the construction of reinforced concrete structures for industrial, civil and transport structures. It is proposed to strengthen the reinforced concrete structures of hydraulic structures with prestressed basalt composite rebar. It took an experimental and theoretical substantiation of technical solutions to strengthen the reinforced concrete structures of hydraulic structures with prestressed basalt composite reinforcement. The aim of the work was to carry out a set of experimental and theoretical studies of the stress-strain state and internal forces in low-reinforced concrete structures of hydraulic structures reinforced with prestressed basalt composite rebar. Methods. Experimental studies of the stress-strain state and internal forces were carried out on the basis of low-reinforced concrete beam-type models with interblock construction joints, harden with prestressed basalt composite reinforcement in the stretched (compressed) zones of the models. Theoretical studies of the stress-strain state and internal forces were carried out on the basis of the theory of reinforced concrete and structural mechanics. Results. As a result of the research carried out on typical low-reinforced concrete structures of hydraulic structures with interblock construction joints, the main stages of the stress-strain state of hydraulic reinforced concrete structures were formulated. Based on the data of experimental and theoretical studies, taking into account the reinforcement with prestressed basalt composite rebar, as well as with prestressed clamps in the shear zone, a method was developed for calculating the strength of low-reinforced hydrotechnical reinforced concrete structures with interblock construction joints.
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Bobalo, Taras, Yaroslav Blikharskyy, Rostyslav Vashkevich e Myhailo Volynets. "Bearing capacity of RC beams reinforced with high strength rebars and steel plate". MATEC Web of Conferences 230 (2018): 02003. http://dx.doi.org/10.1051/matecconf/201823002003.
Testo completoAbstract (sommario):
Nowadays, reducing the material content of not only buildings and structures in general, but also individual constructions is a topical task that can be realized through the use of high-strength concrete and reinforcement, as well as with the use of external reinforcement. The concentrated location of sheet reinforcement on the external the most tense facets of steel and concrete structures increases the operating height of the cross-section, makes it possible to more effectively use the strength properties of steel in comparison with conventional reinforced concrete, and with the same bearing capacity to economize on expenses. Composite and monolithic reinforced concrete structures with external reinforcement are used in various construction sectors around the world. This contributed to the expansion of the use of reinforced concrete for special buildings of power-engineering and hydrotechnical construction. The technical nd econom efficiency, as well as the possibility of using external rebar as formwork for monolithic concrete construction, have been proved. Therefore, there is a need for the study of structures with combined reinforcement, in which high rigidity of steel and concrete structures is combined with an effective use of high-strength reinforcing bars (rebar) without prior tension
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Warkade, Mr Shubham. "Study and Analysis of Steel, RCC, and Composite Structure Comparison". INTERANTIONAL JOURNAL OF SCIENTIFIC RESEARCH IN ENGINEERING AND MANAGEMENT 08, n. 05 (29 maggio 2024): 1–5. http://dx.doi.org/10.55041/ijsrem35057.
Testo completoAbstract (sommario):
In India, plain concrete is a common building material, especially for medium- and low-rise buildings. Even while steel is still widely used in high-rise structures and composite construction is less frequent, it's possible that composite construction could prove more beneficial in these projects. Reinforced concrete is often used in construction projects. Steel beams are put into concrete to make reinforced concrete, an efficient composite material. The distinguishing feature of composite construction is the secure joining and bending of two load-bearing structural elements into a single piece. When compared to RCC most steel frames, composite constructions are considered to be some of the least expensive and transient building materials. The main component of a composite construction is an I-section column embedded or encased in building materials, or a tube of steel filled with steel and concrete. Composed of cold steel plates plus mortar, Part I consists of a beam plus a plate for the deck. The beams are connected to the top slab using fire-resistant and robust shear connections. Keywords— Steel Concrete Composite Building, RCC building, Seismic Analysis etc.
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Wang, Xian Dong, Chang Zhang, Zhen Huang e Guo Wei Chen. "Impact Experimental Research on Hybrid Bamboo Fiber and Steel Fiber Reinforced Concrete". Applied Mechanics and Materials 357-360 (agosto 2013): 1049–52. http://dx.doi.org/10.4028/www.scientific.net/amm.357-360.1049.
Testo completoAbstract (sommario):
This paper studied experimentally the impact mechanical properties of bamboo fiber and hybrid steel fiber reinforced concrete. Steel fiber is already used in construction widely, but it is expensive in cost. As a kind of green building material, bamboo fiber can be used in the infrastructures together with concrete to improve the concretes mechanical properties. In order to investigate the impact mechanical properties of concrete reinforced with bamboo fiber and steel fiber, a series of concrete specimens reinforced with bamboo fiber, steel fiber or both steel fiber and bamboo fiber are investigated with self-designed impact device. The impact resistance abilities are tested and compared.
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Cui, Wen, e Qin Luo. "Application Study on the Steel Fiber Reinforced Concrete". Applied Mechanics and Materials 204-208 (ottobre 2012): 3740–43. http://dx.doi.org/10.4028/www.scientific.net/amm.204-208.3740.
Testo completoAbstract (sommario):
Mix design of the steel fiber reinforced concrete was analyzed based on the engineering conditions. It was indicated by comparing with the strength values of steel fiber reinforced concrete (CF40) and ordinary concrete (C40) that the tensile strength of the steel fiber reinforced concrete increased about 70%, the compressive strength increased about 10%, the initial cracking strength increased about 150%.The reasonable construction technologies were used in mixing, transportation, pouring, vibrating and curing of the steel fiber reinforced concrete in order to ensure quality of the construction.
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Mohammed, Ilham Ibrahim. "Effects of Steel Springs on the Flexural Strength of Normal Concrete Beams: A Numerical and Experimental Study". Journal of Studies in Science and Engineering 3, n. 2 (25 dicembre 2023): 73–84. http://dx.doi.org/10.53898/josse2023326.
Testo completoAbstract (sommario):
In this research study, the possibility of deployment of steel spring utilization to reinforce a concrete beam is investigated and compared with steel bars; this is done to enhance the flexural strength of the structural concrete beam. For this purpose, three specimens are prepared: a plain concrete beam, a reinforced concrete beam, and a spring-reinforced concrete beam. A point bending test is dedicated to calculating the failure strength of each specimen. ABAQUS program is being used to simulate the three test specimens with the same properties as the experimental test samples to verify the results. The results of the numerical simulations for the flexural stress and the plastic strain of each model are collected and compared with the experimental tests. The results manifested a particularly good verification for the experimental tests, and the spring-reinforced concrete beam displayed an excellent flexural strength that exceeded the flexural strength of the reinforced concrete beam. This indicates that the spring-reinforced concrete beam, according to the properties of the spring, is a promising endeavor for use in the construction industry.
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Zhao, Jun. "Reliability Analysis of Reinforced Concrete Structural during Construction". Applied Mechanics and Materials 71-78 (luglio 2011): 310–14. http://dx.doi.org/10.4028/www.scientific.net/amm.71-78.310.
Testo completoAbstract (sommario):
According to random field theory, combined with the construction of the characteristics of reinforced concrete structures, based on the geometric significance of the reliability index, the optimization algorithm of the reliability was established, and the reliability calculation algorithm of reinforced concrete structural during construction is proposed based on stochastic finite element method. Based on a stochastic analysis of the practical engineering, the time-varying laws of the reinforced concrete structural reliability index during construction are concluded.
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Pei, Weichang, Daiyu Wang, Xuan Wang e Zhenyu Wang. "Axial monotonic and cyclic compressive behavior of square GFRP tube–confined steel-reinforced concrete composite columns". Advances in Structural Engineering 24, n. 1 (20 luglio 2020): 25–41. http://dx.doi.org/10.1177/1369433220934557.
Testo completoAbstract (sommario):
Fiber-reinforced polymer tube–confined steel fiber–reinforced concrete column is a novel composite column proposed recently, which consists of a traditional steel-reinforced concrete column and an external glass fiber–reinforced plastic tube for lateral confinement. In order to investigate the axial compression behavior of steel fiber–reinforced concrete columns, a total of 16 square specimens were fabricated and tested under axial monotonic and cyclic compressive loading. Three different configurations of inner shaped steels, including cross-shaped, box-shaped with wielding, and box-shaped without wielding were considered. Two thicknesses of glass fiber–reinforced concrete tubes were also considered as the main experimental parameters. On the basis of test results, a thorough analysis of the failure process based on strain analysis was discussed. The test results showed that steel fiber–reinforced concrete columns exhibited higher ductility and load capacity compared with fiber-reinforced plastic–confined plain concrete columns. Two quantitative indexes were proposed to measure the confinement of steel fiber–reinforced concretes. The axial cyclic mechanical behaviors were discussed through comparative analysis with monotonic behaviors. The remnant strains and modulus of the cyclic behaviors were also discussed.
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Zhang, Shao Jun. "The Construction Quality Control Measures of Reinforced Concrete Cover Research". Applied Mechanics and Materials 599-601 (agosto 2014): 1094–97. http://dx.doi.org/10.4028/www.scientific.net/amm.599-601.1094.
Testo completoAbstract (sommario):
reinforced concrete structures reinforced protective layer deviation will directly affect the mechanical properties and durability of the reinforced concrete member, in relation to the structure of the use of safety and service life. The control to the protective layer of reinforced concrete structures include the following aspects: to do a good job of double sample, reinforced the blue prints.the design, production and installation of template engineering, reinforcing steel bar colligation molding process, placed, binding of fixed steel protective layer block and the requirements on the installation of the steel skeleton.
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Kadhim, N. J., e M. A. Al-Ramahee. "Review of retrofitting techniques of deteriorated reinforced concrete columns". IOP Conference Series: Earth and Environmental Science 1232, n. 1 (1 settembre 2023): 012034. http://dx.doi.org/10.1088/1755-1315/1232/1/012034.
Testo completoAbstract (sommario):
Abstract To ensure sustainability, all types of building structures should be kept in accepted condition throughout their life of service. Rehabilitation has been the subject of extensive research recently because of rising spending on construction and maintenance of constructed infrastructure. The most recent methods to reinforce current reinforced concrete columns, including both conventional and cutting-edge strengthening procedures, are presented in this study. Frequently, general materials used in repairing on-service reinforced concrete columns are concrete, steel, and different kind of Fiber Reinforced Polymer (FRP) composites. Conventional methods and procedures for different mode of failures strengthening, including all types of FRP procedures Near Surface Mounting (NSM) reinforcement, Externally Bonded (EB) FRP, and textile reinforced concrete will all be included in the discussion, and FRP pre-stressing methods for modifying existing structures.
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Luchko, Y. Y., A. Ya Pentsak e R. Ya Pelekh. "Design and calculation of the connection reinforcing bars crimping sleeves". Science and Transport Progress, n. 21 (25 aprile 2008): 139–49. http://dx.doi.org/10.15802/stp2008/16300.
Testo completoAbstract (sommario):
The problem of connection of high-strength carbon and thermomechanically strengthened reinforcements is considered in the paper. The analysis of results of previous investigations from world practice is conducted. The construction of connection is offered and the research of the beam reinforced concrete elements reinforced by the combined reinforcement on durability, crack-durability and deformations is conducted. This research showed the expedience of such a connection and reliable working capacity of the reinforced concrete constructions reinforced by the combined reinforcement.
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RUBIN, O. D., S. E. LISICHKIN e O. V. ZYUZINA. "THE INFLUENCE OF BASALT-COMPOSITE PRESTRESSED REINFORCEMENT ON THE OPERATION OF LOW-REINFORCED CONCRETE STRUCTURES WITH INTERBLOCK CONSTRUCTION JOINTS". Prirodoobustrojstvo, n. 5 (2020): 50–59. http://dx.doi.org/10.26897/1997-6011-2020-5-50-59.
Testo completoAbstract (sommario):
It is proposed to use prestressed basalt composite reinforcement to strengthen reinforced concrete structures of hydraulic structures. In order to substantiate technical reinforcement of reinforced concrete structures of hydraulic structures with prestressed basalt composite inforcement, experimental studies were carried out. For experimental studies, reinforced concrete beam-type structures with vertical interblock construction joints were adopted.The results of experimental studies of reinforced concrete models of beam type with interblock joints reinforced with prestressed basalt composite reinforcement by the method of tension “on concrete”are presented. The models are tested for bending moment and transverse force. A special character of cracking is noted; full restoration of the bearing capacity of reinforced concrete structures, weakened by interblock construction joints, was recorded due to the reinforcement of prestressed basalt composite reinforcement.
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Sokolov, B. S., V. A. Titaev e M. V. Glushkova. "Renewal of interstate standard “Concrete and reinforced concrete board stones”". Concrete and Reinforced Concrete 618, n. 4 (18 ottobre 2023): 12–17. http://dx.doi.org/10.37538/0005-9889-2023-4(618)-12-17.
Testo completoAbstract (sommario):
Introduction. For 35 years since the introduction of State Standard 6665-91, the regulatory framework for the design and production of reinforced concrete products has been significantly changed and supplemented. In this regard, an updated interstate standard for concrete and reinforced concrete side stones has been developed, taking into account changes in the regulatory literature.Aim. Familiarization of specialists in the design and production of concrete and reinforced concrete side stones with the updated State Standard 6665-91 in connection with the updating of the regulatory framework.Materials and methods. The information about the updated interstate standard State Standard 6665 "Concrete and reinforced concrete side stones. Technical conditions", which provides rules and requirements for the design, testing and manufacturing technology of concrete and reinforced concrete side stones.Results. As a result of the revision of the standard, stricter requirements for concrete have been established, the choice of reinforcement classes for reinforcing side stones has been expanded, which can significantly increase their durability.Conclusions. Updating the requirements for acceptance rules and control methods allows to improve the quality of factory production of precast concrete and reinforced concrete side stones.
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Sobczak-Piąstka, Justyna, Oksana Lytvyniak, Andrii Kramarchuk, Borys Ilnytskyy e Yuriy Famulyak. "A Study of Sandwich Reinforced Concrete – Foamed Concrete Floor Slabs". IOP Conference Series: Materials Science and Engineering 1203, n. 3 (1 novembre 2021): 032038. http://dx.doi.org/10.1088/1757-899x/1203/3/032038.
Testo completoAbstract (sommario):
Abstract The development of housing construction demands an application of building materials which ensure necessary functional performance of structures, have high heat-insulating properties, are environmentally friendly and their use is economically appropriate. Simultaneous ensuring of mentioned indices is possible because of complex combined joining of building materials with different physical-mechanical properties. This article presents experimental determination of useful load for sandwich reinforced concrete – foamed concrete floor slabs. Sandwich reinforced concrete – foamed concrete floor slabs are the floor slabs which are composed of normal concrete, non-autoclaved foamed concrete and spatial reinforcement frame. Experimental determination of useful load was carried out on series that compose of four sandwich reinforced concrete – foamed concrete floor slabs. Experimental test of sandwich reinforced concrete – foamed concrete floor slabs was carried out under condition of pure bending that was achieved by applying to floor slab in one third of its span two concentrated forces equal in magnitude. Useful load for sandwich reinforced concrete – foamed concrete floor slabs was 33.23÷77.87 kN/m2. Sandwich reinforced concrete – foamed concrete floor slabs are proposed to be used in construction of housing and social structures.
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Alsadey, Salahaldein, Miftah Abdallateef, Muftah Mohamed e Abdalrhman Milad. "Investigating Behaviour of Reinforced Concrete with Glass Fibre". Jurnal Kejuruteraan 33, n. 3 (30 agosto 2021): 551–57. http://dx.doi.org/10.17576/jkukm-2021-33(3)-16.
Testo completoAbstract (sommario):
Concrete is the most commonly used building material. Nowadays, the world has seen the construction of engineering applications that has become difficult and complicated. Therefore, it is important to have high strength and adequate workability. Besides that, the glass fibre is highly beneficial as a construction material for reinforced concrete as it can be identified as one of the numerous compelling topics related to its benefits. This study contributes to the specification and classification of glass fibre reinforced concrete (GFRC). However, ordinary concrete has limited ductility, slight resistance to cracking, and insufficient tensile strength. Internal micro-cracks in the concrete are visible, and the proliferation of such micro-cracks caused its weak tensile strength. When a certain percentage of fibre is added to the concrete, it improves the properties of the strain, namely, resistance to cracking, ductility, toughness, and flexure strength. The current paper outlines the experimental study conducted on the usage of glass fibre with structural concrete. The parameters were used in percentages, which varied from 0.5% to 2% by weight of cement in concrete, and the properties of the FRC (fibre reinforced concrete), such as ultrasonic pulse velocity test, flexure strength, and compressive strength were examined. However, it refers to an increase in deformation before failure of the structural concrete, reinforced with a high ratio of GFR. The results show good performance of concretes containing glass fibre and increasing glass fibre content, increasing the compressive strength.