Relevant bibliographies by topics / Hybrid fibre concrete

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Academic literature on the topic 'Hybrid fibre concrete'

Author: Grafiati
Published: 4 June 2021
Last updated: 6 February 2022

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Journal articles on the topic "Hybrid fibre concrete"

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Jothi Jayakumar, Vikram, and Sivakumar Anandan. "Composite Strain Hardening Properties of High Performance Hybrid Fibre Reinforced Concrete." Advances in Civil Engineering 2014 (2014): 1–9. http://dx.doi.org/10.1155/2014/363649.

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Hybrid fibres addition in concrete proved to be a promising method to improve the composite mechanical properties of the cementitious system. Fibre combinations involving different fibre lengths and moduli were added in high strength slag based concrete to evaluate the strain hardening properties. Influence of hybrid fibres consisting of steel and polypropylene fibres added in slag based cementitious system (50% CRL) was explored. Effects of hybrid fibre addition at optimum volume fraction of 2% of steel fibres and 0.5% of PP fibres (long and short steel fibre combinations) were observed in improving the postcrack strength properties of concrete. Test results also indicated that the hybrid steel fibre additions in slag based concrete consisting of short steel and polypropylene (PP) fibres exhibited a the highest compressive strength of 48.56 MPa. Comparative analysis on the performance of monofibre concrete consisting of steel and PP fibres had shown lower residual strength compared to hybrid fibre combinations. Hybrid fibres consisting of long steel-PP fibres potentially improved the absolute and residual toughness properties of concrete composite up to a maximum of 94.38% compared to monofibre concrete. In addition, the relative performance levels of different hybrid fibres in improving the matrix strain hardening, postcrack toughness, and residual strength capacity of slag based concretes were evaluated systematically.
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Naraganti, Srinivasa Rao, Rama Mohan Rao Pannem, and Jagadeesh Putta. "Influence of Hybrid Fibres on Bond Strength of Concrete." International Journal of Mathematical, Engineering and Management Sciences 5, no. 2 (April 1, 2020): 353–62. http://dx.doi.org/10.33889/ijmems.2020.5.2.029.

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Bond strength between embedded bar and concrete plays vital role in the design of various reinforced concrete structural elements. Use of metallic and synthetic fibres has been shown to be an effective method to enhance tensile strength, reduce shrinkage and improve durability properties of concrete. However, making of synthetic fibres will not only deplete the natural hydrocarbon resources, but also add greenhouse pollutants to the environment. Hence, sisal fibre was considered as a potential alternative to polypropylene fibre. An experimental study was conducted to evaluate the influence of sisal fibres as mono-fibre and in combination with steel as hybrid fibre on bond strength of concrete. The performance of steel polypropylene fibre reinforced concrete (SPFRC) is compared with that of steel sisal fibre reinforced concrete (SSiFRC). Bond strength was conducted onM30 grade concrete for curing periods of 7, 28 and 90 days. Fibre dosages of 0.50%, 1.00%, 1.25% and 1.50% by volume of concrete were used. Results indicated that increase in steel fibre dosage improved the bond strength slightly. However, increase in fibre dosage of either PP fibres or sisal fibres resulted decrease in bond strength. Furthermore, sisal fibre reinforced concrete (SiFRC) showed inferior performance in bond strength as compared to polypropylene fibre reinforced concrete (PFRC). A detailed statistical analysis revealed that although no strong correlation between the compressive strength and the bond strength was evident from the experimental study, means of bond strength of both the hybrid groups did not differ significantly. In addition, empirical equations were proposed to predict the bond strength of fibre reinforced concrete (FRC) based on compressive strength.
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Singh, Niraj Kumar, and Baboo Rai. "A Review of Fiber Synergy in Hybrid Fiber Reinforced Concrete." Journal of Applied Engineering Sciences 8, no. 2 (December 1, 2018): 41–50. http://dx.doi.org/10.2478/jaes-2018-0017.

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Abstract Fibre reinforced concrete (FRC) presently utilized as a part of special structures subjected to dynamic loads for example airport pavements, expressways overlays, bridge decks and machine foundations. In most cases, FRC contains just a single kind of fibre. The utilization of at least two kinds of fibres in an appropriate mix can possibly improve the mechanical properties of concrete and result in performance synergy. The audit demonstrates that the blend of fibre allows a more powerful control of the dynamic crack development. This review analyses the components for synergistic impacts that gives direction on the fiber and matrix choice.
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Hossain, Muhammad Monowar, Safat Al-Deen, Md Kamrul Hassan, Sukanta Kumer Shill, Md Abdul Kader, and Wayne Hutchison. "Mechanical and Thermal Properties of Hybrid Fibre-Reinforced Concrete Exposed to Recurrent High Temperature and Aviation Oil." Materials 14, no. 11 (May 21, 2021): 2725. http://dx.doi.org/10.3390/ma14112725.

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Over the years, leaked fluids from aircraft have caused severe deterioration of airfield pavement. The combined effect of hot exhaust from the auxiliary power unit of military aircraft and spilt aviation oils have caused rapid pavement spalling. If the disintegrated concreted pieces caused by spalling are sucked into the jet engine, they may cause catastrophic damage to the aircraft engine or physical injury to maintenance crews. This study investigates the effectiveness of incorporating hybrid fibres into ordinary concrete to improve the residual mechanical and thermal properties to prevent spalling damage of pavement. Three fibre-reinforced concrete samples were made with micro steel fibre and polyvinyl alcohol fibre with a fibre content of zero, 0.3%, 0.5% and 0.7% by volume fraction. These samples were exposed to recurring high temperatures and aviation oils. Tests were conducted to measure the effects of repeated exposure on the concrete’s mechanical, thermal and chemical characteristics. The results showed that polyvinyl alcohol fibre-, steel fibre- and hybrid fibre-reinforced concrete suffered a 52%, 40% and 26.23% of loss of initial the compressive strength after 60 cycles of exposure to the conditions. Moreover, due to the hybridisation of concrete, flexural strength and thermal conductivity was increased by 47% and 22%. Thus, hybrid fibre-reinforced concrete performed better in retaining higher residual properties and exhibited no spalling of concrete.
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Liu, Yanzhu, Liang Wang, Ke Cao, and Lei Sun. "Review on the Durability of Polypropylene Fibre-Reinforced Concrete." Advances in Civil Engineering 2021 (June 4, 2021): 1–13. http://dx.doi.org/10.1155/2021/6652077.

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Polypropylene fibre (PPF) is a kind of polymer material with light weight, high strength, and corrosion resistance. The crack resistance of concrete can be improved by adding PPFs. PPF can optimize the pore size distribution of concrete. As a result, the durability of concrete is significantly enhanced since PPF can block the penetration of water or harmful ions in concrete. This paper summarizes the influence of polypropylene fibre on the durability of concrete, including drying shrinkage, creep, water absorption, permeability resistance, chloride ion penetration resistance, sulfate corrosion resistance, freeze-thaw cycle resistance, carbonation resistance, and fire resistance. The authors analysed the effects of fibre content, fibre diameter, and fibre hybrid ratio on these durability indexes. The durability property of concrete can be further improved by combining PPFs and steel fibres. The drawbacks of PPF in application in concrete are the imperfect dispersion in concrete and weak bonding with cement matrix. The methods to overcome these drawbacks are to use fibre modified with nanoactive powder or chemical treatment. At last, the authors give the future research prospects of concrete made with PPFs.
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Ahmed, Abubaker A. M., and Yanmin Jia. "Effect of Using Hybrid Polypropylene and Glass Fibre on the Mechanical Properties and Permeability of Concrete." Materials 12, no. 22 (November 18, 2019): 3786. http://dx.doi.org/10.3390/ma12223786.

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A comprehensive program of experiments consisting of compression, uniaxial compression, direct shear, flexural as well as splitting tensile and air permeability tests were performed to analyse the effect of the level of fibre dosage and the water–cement ratio on the physical properties of hybrid fibre-reinforced concrete (HFRC). Two types of fibres were studied in terms of their effect on the properties of HFRC. The results indicated that the mechanical properties of concrete were significantly improved by increasing the fibre content. However, increasing the percentage fibre content past a certain peak performance limit (0.9% glass fibre (GF) and 0.45% polypropylene fibre (PPF)) led to a decrease in strength compared to reference mixes. Additionally, the incorporation of hybrid fibres yielded an increase in air permeability in the tested specimens. The results showed that the strength-related properties of HFRC were superior to the properties of single fibre-reinforced concrete.
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Ding, Yi Ning, Yue Hua Wang, and Yu Lin Zhang. "Investigation on Toughness of Fibre Cocktail Reinforced Self Consolidating Concrete after High Temperature." Materials Science Forum 650 (May 2010): 67–77. http://dx.doi.org/10.4028/www.scientific.net/msf.650.67.

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The effect of different fibres on the residual load-bearing capacity and the failure pattern of high-performance self consolidating concrete (HPSCC) after exposure to high temperature hass been studied in this work. The polypropylene fibers mitigate the spalling of HPSCC element clearly, but did not show clear effect on the mechanic properties of concrete. The macro steel fiber reinforced HPSCC showed higher flexural toughness and ultimate load before and after high temperatures. The mechanical properties of hybrid fibre reinforced HPSCC (HFHPSCC) after heating were better than that of mono-fibre reinforced HPSCC. The failure mode changed from pull-out of steel fibers at lower temperature to broken down of steel fibers at higher temperature. The use of hybrid fibre can be effective in providing the residual strength and failure pattern, and improving the toughness of HPSCC after high temperature.
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Bošnjak, Josipa, Akanshu Sharma, and Kevin Grauf. "Mechanical Properties of Concrete with Steel and Polypropylene Fibres at Elevated Temperatures." Fibers 7, no. 2 (January 24, 2019): 9. http://dx.doi.org/10.3390/fib7020009.

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Addition of steel fibres to concrete is known to have a significant positive influence on the mechanical properties of concrete. Micro polypropylene (PP) fibres are added to concrete to improve its performance under thermal loads such as in case of fire by preventing the phenomena of explosive spalling. An optimum mixture of steel and micro PP fibres added to concrete may be utilized to enhance both the mechanical and thermal behaviour of concrete. In this work, systematic investigations were carried out to study the influence of elevated temperature on the mechanical properties and physical properties of high strength concrete without and with fibres. Three different mixtures for high strength concrete were used, namely normal concrete without fibres, Steel fibre reinforced concrete and Hybrid fibre reinforced concrete having a blend of hooked end steel fibres and micro PP fibres. The specimens were tested in ambient conditions as well as after exposure to a pre-defined elevated temperature and cooling down to room temperature. For all investigated concrete mixtures the thermal degradation of following properties were investigated: compressive strength, tensile splitting strength, bending strength, fracture energy and static modulus of elasticity. This paper summarizes the findings of the tests performed.
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Frydrych, Iwona, G. Elangovan, and K. Mohan Das. "Flexural Behaviour of Fibre Reinforced Concrete Beams with Different Aspect Ratios." Fibres and Textiles in Eastern Europe 26, no. 1(127) (February 28, 2018): 59–66. http://dx.doi.org/10.5604/01.3001.0010.7798.

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The performance of conventional concrete is enhanced by the addition of fibres in concrete. Consequently the brittleness in concrete is reduced, and its acceptable ductility is also ensured by this addition. In this paper the strength of concrete cubes, cylinders and beams cast using M25 grade concrete and reinforced with steel and polypropylene fibres is presented. Also hybrid fibres with crimped steel and polypropylene were used in a concrete matrix to study improvements in the strength properties of steel, polypropylene and hybrid polypropylene as well as steel (crimped) fibres of various proportion i.e., 0.25%, 0.5%, 0.75%, 1% and 0.5% (0.25% of steel and 0.25% of polypropylene), 0.75% (0.5% of steel and 0.25% of polypropylene, 0.25% of steel and 0.5% of polypropylene) and 1% of various combinations of hybrid fibres for 7,14 and 28 days. The main reason for synthetic fibres in the concrete matrix is to improve the post cracking response of the concrete to improve the energy absorption capacity and ductility as well as to provide crack resistance and control. The introduction of this type of concrete was brought in as a solution to develop concrete with enhanced flexural and tensile strength. In this paper we analysed and present a comparison between conventional concrete and fibre reinforced concrete, leading to a crack free structure.
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Guades, Ernesto, Henrik Stang, Gregor Fisher, and Jacob Schmidt. "Hybrid fibre-reinforced geopolymer (HFRG) composites as an emerging material in retrofitting aging and seismically-deficient concrete and masonry structures." MATEC Web of Conferences 289 (2019): 04003. http://dx.doi.org/10.1051/matecconf/201928904003.

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Fibre-reinforced polymer (FRP) systems have recently become popular in repairing concrete or masonry structures because of their inherent advantages. In spite of these benefits, FRPs have drawbacks having low fire resistance, poor environmental sustainability and incompatibilty with the substrate concrete. The effort to address these issues has led to the development of an emerging strain hardening cementitious (SHC) material using an inorganic polymer known as hybrid fibre-reinforced geopolymer (HFRG) composites. Compared with cement-based SHC composites, HFRG has better bond performance to concrete substrates, higher fire resistance, greater corrosion durability and helps to reduce CO2 emissions. This paper reviews the recent development of HFRG composites as an emerging repair material. Literature reveals that flowability of a fresh HFRG mixture decreases with increasing fibre content though still workable up to 2% fibre volume. Fibre synergy could result in 10–181% higher flexural toughness of geopolymer composites than when just using mono fibres. The application of HFRG composites to RC beams increased displacement ductility by to 263%. To date, there has been no reported field application of HFRG as a repair material though mono-fibre FRG has been field-applied as a strengthening material in large-diameter sewer RC pipes, RC culverts, RC sewerage manholes and dam surface improvement.
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Dissertations / Theses on the topic "Hybrid fibre concrete"

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Stähli, Patrick. "Ultra-fluid, oriented hybrid-fibre-concrete /." Zürich : ETH / Institute for Building Materials, 2008. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=17996.

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Almahmood, Hanady, Ashraf F. Ashour, and Therese Sheehan. "Flexural behaviour of hybrid steel-GFRP reinforced concrete continuous T-beams." Elsevier, 2020. http://hdl.handle.net/10454/17994.

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Yes
This paper presents test results of six full scale reinforced concrete continuous T beams. One beam was reinforced with glass fibre reinforced polymer (GFRP) bars while the other five beams were reinforced with a different combination of GFRP and steel bars. The ratio of GFRP to steel reinforcement at both mid-span and middle-support sections was the main parameter investigated. The results showed that adding steel reinforcement to GFRP reinforced concrete T-beams improves the flexural stiffness, ductility and serviceability in terms of crack width and deflection control. However, the moment redistribution at failure was limited because of the early yielding of steel reinforcement at a beam section that does not reach its moment capacity and could still carry more loads due to the presence of FRP reinforcement. The experimental results were compared with the ultimate moment prediction of ACI 440.2R-17, and with the existing theoretical equations for deflection prediction. It was found that the ACI 440.2R-17 reasonably estimated the moment capacity of both mid-span and middle support sections. Conversely, the available theoretical deflection models underestimated the deflection of hybrid reinforced concrete T-beams at all load stages.
The full-text of this article will be released for public view after the publisher embargo on 10 Aug 2021.
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Hinzen, Marcus, and Wolfgang Brameshuber. "Improvement of Serviceability and Strength of Textile Reinforced Concrete by using Short Fibres." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2009. http://nbn-resolving.de/urn:nbn:de:bsz:14-ds-1244046356375-03273.

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Nowadays, thin-walled load bearing structures can be realised using textile reinforced concrete (BRAMESHUBER and RILEM TC 201-TRC [1]). The required tensile strength is achieved by embedding several layers of textile. By means of the laminating technique the number of textile layers that can be included into the concrete could be increased. To further increase the first crack stress and the ductility as well as to optimize the crack development, fine grained concrete mixes with short fibres can be used. By a schematic stress-strain curve the demands on short fibres are defined. Within the scope of this study, short fibres made of glass, carbon, aramid and polyvinyl alcohol are investigated in terms of their ability to fit these requirements. On the basis of these results, the development of hybrid fibre mixes to achieve the best mechanical properties is described. Additionally, a conventional FRC with one fibre type is introduced. Finally, the fresh and hardened concrete properties as well as the influence of short fibres on the load bearing behaviour of textile reinforced concrete are discussed.
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Tsang, Terry Kin Chung. "Behaviour of concrete beams reinforced with hybrid FRP composite rebars /." View abstract or full-text, 2006. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202006%20TSANGT.

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Yurtseven, Alp Eren. "Determination Of Mechanical Properties Of Hybrid Fiber Reinforced Concrete." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12605268/index.pdf.

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ABSTRACT DETERMINATION OF MECHANICAL PROPERTIES OF HYBRID FIBER REINFORCED CONCRETE Yurtseven, Alp Eren M.Sc. Department of Civil Engineering Supervisor: Prof. Dr. Mustafa Tokyay Co-Supervisor: Asst. Prof. Dr. . Ö
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r Yaman August 2004, 82 pages Fiber reinforcement is commonly used to provide toughness and ductility to brittle cementitious matrices. Reinforcement of concrete with a single type of fiber may improve the desired properties to a limited level. A composite is termed as hybrid, if two or more types of fibers are rationally combined to produce a composite that derives benefits from each of the individual fibers and exhibits a synergetic response. This study aims to characterize and quantify the mechanical properties of hybrid fiber reinforced concrete. For this purpose nine mixes, one plain control mix and eight fiber reinforced mixes were prepared. Six of the mixes were reinforced in a hybrid form. Four different types of fibers were used in combination, two of which were macro steel fibers, and the other two were micro fibers. Volume percentage of fiber inclusion was kept constant at 1.5%. In hybrid reinforced mixes volume percentage of macro fibers was 1.0% whereas the remaining fiber inclusion was v composed of micro fibers. Slump test was carried out for each mix in the fresh state. 28-day compressive strength, flexural tensile strength, flexural toughness, and impact resistance tests were performed in the hardened state. Various numerical analyses were carried out to quantify the determined mechanical properties and to describe the effects of fiber inclusion on these mechanical properties. Keywords: Fiber Reinforcement, Hybrid Composite, Toughness, Impact Resistance
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Christ, Roberto. "Desenvolvimento de compósitos cimentícios avançados à base de pós-reativos com misturas híbridas de fibras e reduzido impacto ambiental." Universidade do Vale do Rio dos Sinos, 2014. http://www.repositorio.jesuita.org.br/handle/UNISINOS/3207.

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Submitted by Vanessa Nunes (vnunes) on 2015-03-31T13:19:31Z No. of bitstreams: 1 RobertoChrist.pdf: 9317574 bytes, checksum: 23b19b5dd98381b184ffb8f3c20b2951 (MD5)
Made available in DSpace on 2015-03-31T13:19:31Z (GMT). No. of bitstreams: 1 RobertoChrist.pdf: 9317574 bytes, checksum: 23b19b5dd98381b184ffb8f3c20b2951 (MD5) Previous issue date: 2014-02-20
itt Performance - Instituto Tecnológico em Desempenho da Construção Civil
O desenvolvimento de novos concretos vem sendo ampliado ao longo dos anos, o que ocorre paralelamente ao aprimoramento dos cálculos estruturais e ao maior conhecimento sobre as propriedades dos materiais, o que conduz os projetistas ao desenvolvimento de estruturas que necessitam ter características específicas. Com isso surge a necessidade de se desenvolver concretos especiais, que apresentam elevada resistência mecânica e durabilidade. O concreto de pós reativos, também chamado de CPR, é um exemplo destes materiais. Trata-se de um concreto de ultra alto desempenho, com elevada resistência mecânica, extremamente dúctil e de baixa porosidade. Este tipo de concreto apresenta propriedades mecânicas superiores em comparação aos concretos de alta resistência, chegando a resistências à compressão de 200 MPa, à tração de 45MPa e módulo de elasticidade superior a 50 GPa. O consumo de cimento neste tipo de concreto pode atingir 800 kg/m3, além de incorporar elevado volume de sílica ativa. A otimização granular dos constituintes, realizada através de métodos de empacotamento de partículas, faz com que seja possível obter um material com o mínimo de vazios e elevada densidade. As fibras introduzidas no composto proporcionam elevada ductilidade. Neste trabalho, parte do cimento Portland foi substituído por cinza volante, para desenvolver um CPR com baixo consumo de aglomerantes. Também foi estudada a incorporação de dois tipos de fibras, ou hibridização, para uma matriz de CPR com menor consumo de cimento. A introdução de dois tipos distintos de fibras proporciona ao material maior sinergia, diminuindo a formação e a propagação de fissuras durante o carregamento. Os resultados obtidos nesta pesquisa mostram que a substituição parcial do cimento por cinza volante apresentou melhor desempenho mecânico, atingindo resistência à compressão de aproximadamente 190 MPa com 30% de adição. A incorporação de dois tipos distintos de fibras, aço e polipropileno em teores de 80% e 20% respectivamente, proporcionou ao material elevada resistência à tração na flexão e tenacidade. Portanto, é possível dosar CPR com menores consumos de cimento e uso de dois tipos de fibras, melhorando as propriedades da mistura e obtendo um compósito com reduzido impacto ambiental.
The development of new concretes is being expanded over the years, withal the improvements in structural design, along the increased knowledge of materials properties, which leads the designers to develop structures with specific requirements. It arises the need of the development of special concretes, with have enhanced mechanical strength and durability. Reactive powder concrete, also called RPC, is an example of these materials. This is an ultra-high-performance concrete with high mechanical strength, extremely ductile and low porosity. This type of concrete has superior mechanical properties compared to high strength concrete, reaching compressive strengths of 200 MPa, tensile strengths of 45 MPa and modulus higher than 50 GPa. The cement consumption in this type of concrete may reach 800 kg/m3, while incorporating high volumes of silica fume. The optimization of granular constituents accomplished by particle packing methods provides a material with a minimum of voids and also high density. The fiber introduced into the material compound provides high ductility. On this report, fly ash was used to replace some part of the cement, aiming the development of a RPC with low agglomerate consumption. It was also studied the use of two types of fiber, or hybridization, to a RPC matrix array of CPR with less consumption of cement. The introduction of two distinct types of fibers gives the material improved synergy, decreasing the formation and propagation of cracks during the charging. The results obtained in this study show that the partial replacement of cement by fly ash gives better mechanical performance, reaching the compressive strength of approximately 190 MPa with 30% addition. The incorporation of two different types of fibers, steel and polypropylene at levels of 80% and 20% respectively, provided the materials high tensile strength and toughness. Therefore, it is possible to compose an RPC with lower cement consumption and use of two types of fibers, improving the properties of the mixture and obtaining a composite with reduced environmental impact.
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Shi, Yilei. "Seismic Performance of Hybrid Fiber Reinforced Polymer-Concrete Pier Columns." FIU Digital Commons, 2009. http://digitalcommons.fiu.edu/etd/101.

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As part of a multi-university research program funded by NSF, a comprehensive experimental and analytical study of seismic behavior of hybrid fiber reinforced polymer (FRP)-concrete column is presented in this dissertation. Experimental investigation includes cyclic tests of six large-scale concrete-filled FRP tube (CFFT) and RC columns followed by monotonic flexural tests, a nondestructive evaluation of damage using ultrasonic pulse velocity in between the two test sets and tension tests of sixty-five FRP coupons. Two analytical models using ANSYS and OpenSees were developed and favorably verified against both cyclic and monotonic flexural tests. The results of the two methods were compared. A parametric study was also carried out to investigate the effect of three main parameters on primary seismic response measures. The responses of typical CFFT columns to three representative earthquake records were also investigated. The study shows that only specimens with carbon FRP cracked, whereas specimens with glass or hybrid FRP did not show any visible cracks throughout cyclic tests. Further monotonic flexural tests showed that carbon specimens both experienced flexural cracks in tension and crumpling in compression. Glass or hybrid specimens, on the other hand, all showed local buckling of FRP tubes. Compared with conventional RC columns, CFFT column possesses higher flexural strength and energy dissipation with an extended plastic hinge region. Among all CFFT columns, the hybrid lay-up demonstrated the highest flexural strength and initial stiffness, mainly because of its high reinforcement index and FRP/concrete stiffness ratio, respectively. Moreover, at the same drift ratio, the hybrid lay-up was also considered as the best in term of energy dissipation. Specimens with glassfiber tubes, on the other hand, exhibited the highest ductility due to better flexibility of glass FRP composites. Furthermore, ductility of CFFTs showed a strong correlation with the rupture strain of FRP. Parametric study further showed that different FRP architecture and rebar types may lead to different failure modes for CFFT columns. Transient analysis of strong ground motions showed that the column with off-axis nonlinear filament-wound glass FRP tube exhibited a superior seismic performance to all other CFFTs. Moreover, higher FRP reinforcement ratios may lead to a brittle system failure, while a well-engineered FRP reinforcement configuration may significantly enhance the seismic performance of CFFT columns.
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Trono, William Dean. "Earthquake Resilient Bridge Columns Utilizing Damage Resistant Hybrid Fiber Reinforced Concrete." Thesis, University of California, Berkeley, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=3640671.

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Modern reinforced concrete bridges are designed to avoid collapse and to prevent loss of life during earthquakes. To meet these objectives, bridge columns are typically detailed to form ductile plastic hinges when large displacements occur. California seismic design criteria acknowledges that damage such as concrete cover spalling and reinforcing bar yielding may occur in columns during a design-level earthquake.

The seismic resilience of bridge columns can be improved through the use of a damage resistant hybrid fiber reinforced concrete (HyFRC). Fibers delay crack propagation and prevent spalling under extreme loading conditions, and the material resists many typical concrete deterioration mechanisms through multi-scale crack control.

Little is known about the response of the material when combined with conventional reinforcing bars. Therefore, experimental testing was conducted to evaluate such behaviors. One area of focus was the compression response of HyFRC when confined by steel spirals. A second focus was the tensile response of rebar embedded in HyFRC. Bridge columns built with HyFRC would be expected to experience both of these loading conditions during earthquakes.

The third focus of this dissertation was the design, modeling, and testing of an innovative damage resistant HyFRC bridge column. The column was designed to rock about its foundation during earthquakes and to return to its original position thereafter. In addition to HyFRC, it was designed with unbonded post-tensioning, unbonded rebar, and headed rebar which terminated at the rocking plane. Because of these novel details, the column was not expected to incur damage or residual displacements under earthquake demands exceeding the design level for ordinary California bridges. A sequence of scaled, three dimensional ground motion records was applied to the damage resistant column on a shaking table. An equal scale reinforced concrete reference column with conventional design details was subjected to the same motions for direct comparison.

Compression tests showed that the ductility of HyFRC is superior to concrete in the post-peak softening branch of the response. HyFRC achieved a stable softening response and had significant residual load capacity even without spiral confinement. Concrete required the highest tested levels of confinement to achieved comparable post-peak ductility. Tension tests showed that HyFRC provides a substantial strength enhancement to rebar well beyond their yield point. Interesting crack localization behavior was observed in HyFRC specimens and appeared to be dependent on the volumetric ratio of rebar.

The damage resistant HyFRC bridge column attained its design objectives during experimental testing. It exhibited pronounced reentering behavior with only light damage under earthquake demands 1.5 to 2.0 times the design level. It accumulated only 0.4% residual drift ratio after seven successive ground motions which caused a peak drift ratio of 8.0%. The conventional reinforced concrete column experienced flexural plastic hinging with extensive spalling during the same seven motions. It accumulated 6.8% residual drift ratio after enduring a peak drift ratio of 10.8%.

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Li, Bin. "Seismic Performance of Hybrid Fiber Reinforced Polymer-Concrete Pier Frame Systems." FIU Digital Commons, 2008. http://digitalcommons.fiu.edu/etd/195.

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As an alternative to transverse spiral or hoop steel reinforcement, fiber reinforced polymers (FRPs) were introduced to the construction industry in the 1980's. The concept of concrete-filled FRP tube (CFFT) has raised great interest amongst researchers in the last decade. FRP tube can act as a pour form, protective jacket, and shear and flexural reinforcement for concrete. However, seismic performance of CFFT bridge substructure has not yet been fully investigated. Experimental work in this study included four two-column bent tests, several component tests and coupon tests. Four 1/6-scale bridge pier frames, consisting of a control reinforced concrete frame (RCF), glass FRP-concrete frame (GFF), carbon FRP-concrete frame (CFF), and hybrid glass/carbon FRP-concrete frame (HFF) were tested under reverse cyclic lateral loading with constant axial loads. Specimen GFF did not show any sign of cracking at a drift ratio as high as 15% with considerable loading capacity, whereas Specimen CFF showed that lowest ductility with similar load capacity as in Specimen GFF. FRP-concrete columns and pier cap beams were then cut from the pier frame specimens, and were tested again in three point flexure under monotonic loading with no axial load. The tests indicated that bonding between FRP and concrete and yielding of steel both affect the flexural strength and ductility of the components. The coupon tests were carried out to establish the tensile strength and elastic modulus of each FRP tube and the FRP mold for the pier cap beam in the two principle directions of loading. A nonlinear analytical model was developed to predict the load-deflection responses of the pier frames. The model was validated against test results. Subsequently, a parametric study was conducted with variables such as frame height to span ratio, steel reinforcement ratio, FRP tube thickness, axial force, and compressive strength of concrete. A typical bridge was also simulated under three different ground acceleration records and damping ratios. Based on the analytical damage index, the RCF bridge was most severely damaged, whereas the GFF bridge only suffered minor repairable damages. Damping ratio was shown to have a pronounced effect on FRP-concrete bridges, just the same as in conventional bridges. This research was part of a multi-university project, which is founded by the National Science Foundation (NSF) Network for Earthquake Engineering Simulation Research (NEESR) program.
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Hampton, Francis Patrick. "Cyclic behavior, development, and characteristics of a ductile hybrid fiber reinforced polymer (DHFRP) for reinforced concrete members /." Philadelphia, Pa. : Drexel University, 2004. http://dspace.library.drexel.edu/handle/1860/285.

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Books on the topic "Hybrid fibre concrete"

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Choong, Kok Keong, Jayaprakash Jaganathan, Sharifah Salwa Mohd Zuki, Shahiron Shahidan, and Nurul Izzati Raihan Ramzi Hannan. Concrete-Filled Double Skin Steel Tubular Column with Hybrid Fibre Reinforced Polymer. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-2715-6.

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Keller, Thomas. Use of fibre reinforced polymers in bridge construction. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2003. http://dx.doi.org/10.2749/sed007.

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<p>The aim of the present Structural Engineering Document, a state-of-the-art report, is to review the progress made worldwide in the use of fibre rein­forced polymers as structural components in bridges until the end of the year 2000.<p> Due to their advantageous material properties such as high specific strength, a large tolerance for frost and de-icing salts and, furthermore, short installation times with minimum traffic interference, fibre reinforced polymers have matured to become valuable alternative building materials for bridge structures. Today, fibre reinforced polymers are manufactured industrially to semi-finished products and ccimplete structural components, which can be easily and quickly installed or erected on site.<p> Examples of semi-finished products and structural components available are flexible tension elements, profiles stiff in bending and sandwich panels. As tension elements, especially for the purpose of strengthening, strips and sheets are available, as weil as reinforcing bars for concrete reinforcement and prestressing members for internal prestressing or external use. Profiles are available for beams and columns, and sandwich constructions especially for bridge decks. During the manufacture of the structural components fibre-optic sensors for continuous monitoring can be integrated in the materials. Adhesives are being used more and more for joining com­ponents.<p> Fibre reinforced polymers have been used in bridge construction since the mid-1980s, mostly for the strengthening of existing structures, and increas­ingly since the mid-1990s as pilot projects for new structures. In the case of new structures, three basic types of applications can be distinguished: concrete reinforcement, new hybrid structures in combination with traditional construction materials, and all-composite applications, in which the new materials are used exclusively.<p> This Structural Engineering Document also includes application and research recommendations with particular reference to Switzerland.<p> This book is aimed at both students and practising engineers, working in the field of fibre reinforced polymers, bridge design, construction, repair and strengthening.
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Markovic, Ivan. High-Performance Hybrid-Fibre Concrete: Development and Utilisation. Delft Univ Pr, 2006.

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Investigation on Hybrid Concrete Using Steel and Polypropylene Fibre. Tiruchengode, India: ASDF International, 2017.

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Shear Behaviour of Hybrid Fibre Reinforced Geo Polymer Concrete Beams. ASDF International, 2017.

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Book chapters on the topic "Hybrid fibre concrete"

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Sabu, Ann, and Lathi Karthi. "Experimental Study on Hybrid Fibre Reinforced Geopolymer Concrete." In Lecture Notes in Civil Engineering, 213–20. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-26365-2_21.

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Choong, Kok Keong, Jayaprakash Jaganathan, Sharifah Salwa Mohd Zuki, Shahiron Shahidan, and Nurul Izzati Raihan Ramzi Hannan. "Repair of Fire-Damaged Concrete-Filled Double Skin Steel Tubular Columns with Fiber Reinforced Polymer (FRP)." In Concrete-Filled Double Skin Steel Tubular Column with Hybrid Fibre Reinforced Polymer, 55–77. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-2715-6_5.

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Choong, Kok Keong, Jayaprakash Jaganathan, Sharifah Salwa Mohd Zuki, Shahiron Shahidan, and Nurul Izzati Raihan Ramzi Hannan. "Post-fire Behavior of Concrete-Filled Double Skin Steel Tubular Columns." In Concrete-Filled Double Skin Steel Tubular Column with Hybrid Fibre Reinforced Polymer, 19–36. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-2715-6_3.

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Aswin, Muhammad, Ehsan Nikbakht, Nazihah Shahirah Bt Nazir, Noor Syamimi Bt Tajuddin, and Nor Amirah Bt Ahmad. "Experimental Study on Structural Behaviour of Corbels with Hybrid Fibre Reinforced Concrete (HyFRC)." In Lecture Notes in Civil Engineering, 413–20. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-6311-3_47.

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Choong, Kok Keong, Jayaprakash Jaganathan, Sharifah Salwa Mohd Zuki, Shahiron Shahidan, and Nurul Izzati Raihan Ramzi Hannan. "Temperature Distribution and Post-fire Behavior of Concrete-Filled Double Skin Steel Tubular Columns." In Concrete-Filled Double Skin Steel Tubular Column with Hybrid Fibre Reinforced Polymer, 37–54. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-2715-6_4.

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Choong, Kok Keong, Jayaprakash Jaganathan, Sharifah Salwa Mohd Zuki, Shahiron Shahidan, and Nurul Izzati Raihan Ramzi Hannan. "Literature Review." In Concrete-Filled Double Skin Steel Tubular Column with Hybrid Fibre Reinforced Polymer, 5–18. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-2715-6_2.

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Choong, Kok Keong, Jayaprakash Jaganathan, Sharifah Salwa Mohd Zuki, Shahiron Shahidan, and Nurul Izzati Raihan Ramzi Hannan. "Conclusion and Recommendation." In Concrete-Filled Double Skin Steel Tubular Column with Hybrid Fibre Reinforced Polymer, 79–81. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-2715-6_6.

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Choong, Kok Keong, Jayaprakash Jaganathan, Sharifah Salwa Mohd Zuki, Shahiron Shahidan, and Nurul Izzati Raihan Ramzi Hannan. "Introduction." In Concrete-Filled Double Skin Steel Tubular Column with Hybrid Fibre Reinforced Polymer, 1–3. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-2715-6_1.

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Joseph, Ashly, and S. Sreerath. "Experimental Investigation on Fresh and Hardened Properties of Hybrid Fibre-Reinforced Self-Compacting Concrete." In Lecture Notes in Civil Engineering, 831–40. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-26365-2_76.

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Aidarov, Stanislav, Luca Sutera, Manuela Valerio, and Albert de la Fuente. "Elevated Steel Fibre Reinforced Concrete Slabs and the Hybrid Alternative: Design Approach and Parametric Study at Ultimate Limit State." In RILEM Bookseries, 504–13. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-83719-8_44.

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Conference papers on the topic "Hybrid fibre concrete"

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Karmazínová, M., and J. Melcher. "Resistance of Steel-Concrete Composite Beams with Glass-Fibre-Reinforced Concrete Slab." In 10th International Conference on Advances in Steel Concrete Composite and Hybrid Structures. Singapore: Research Publishing Services, 2012. http://dx.doi.org/10.3850/978-981-07-2615-7_233.

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"An Assessment of Flexural Improvement of Light Weight Concrete via Hybrid Fibres along with Sisal Fibres in Addition to Banana Fibres." In Recent Advancements in Geotechnical Engineering. Materials Research Forum LLC, 2021. http://dx.doi.org/10.21741/9781644901618-10.

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Abstract: Innate fibres, these days have become the topic of argument in the research field between different scientists to inculcate it in the formation of lightweight concrete mixture. This is due to a variety of rewards connected with natural fibres like recyclable, economical, availability in large quantity and its bio-degradability. Plenty of projects have been carried out in the production of natural fibre reinforced lightweight concrete. In this project, we would like to take the naturally existing fibre named sisal fibre and banana fibre as partial replacement material. The adding of natural fibre to the lightweight concrete will enhance the diverse strength parameters like flexural strength, compressive strength, and increase the ductile behaviour. In the current work, it is intended to explore the mechanical properties of lightweight concrete with substitution of sisal fibre and banana fibre for cement in different percentages. The compressive strength, flexural strength, deflection of the beam is calculated with the reflection of M30 concrete specimens. Totally 45 number of 500 x 100 x 100mm flexural member, 45 numbers of cubes and 45 numbers of cylinders are cast and tested. It is suggested that up to 1.5% substitution of sisal fibres and banana fibre with cement provide at M30 grade of concrete giveing the most beneficial increases of strength values. The assessment outcome indicated that the sisal fibres and banana fibre were efficient in improving the performance of lightweight concrete
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Bradford, M. A., F. M. Abas, R. I. Gilbert, and S. J. Foster. "Strength of Continuous Composite Slabs Containing Fibre Reinforced Concrete." In 10th International Conference on Advances in Steel Concrete Composite and Hybrid Structures. Singapore: Research Publishing Services, 2012. http://dx.doi.org/10.3850/978-981-07-2615-7_095.

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Ellobody, Ehab, and Mariam F. Ghazy. "Tests and Design of Stainless Steel Tubular Columns Filled with Polypropylene Fibre Reinforced Concrete." In 10th International Conference on Advances in Steel Concrete Composite and Hybrid Structures. Singapore: Research Publishing Services, 2012. http://dx.doi.org/10.3850/978-981-07-2615-7_157.

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VIKRAM, J., and S. K. SEKAR. "Comparative assessment of impact toughness behavior of hybrid fibre reinforced concrete." In Third International Conference on Advances in Civil, Structural and Mechanical Engineering- CSM 2015. Institute of Research Engineers and Doctors, 2015. http://dx.doi.org/10.15224/978-1-63248-062-0-73.

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Alam, Md Ashraful, Khalid AlRiyami, and Mohd Zamin Zummat. "Development of Kenaf Fibre Hybrid Composite Plate for Strengthening of Reinforced Concrete Beam." In Proceedings of the International Engineering Conference. Singapore: Research Publishing Services, 2014. http://dx.doi.org/10.3850/978-981-09-4587-9_p42.

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Sheikh, Shamim Ahmed, and Zahra Kharal. "Corrosion-resistant Reinforced Concrete Columns." In IABSE Conference, Kuala Lumpur 2018: Engineering the Developing World. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2018. http://dx.doi.org/10.2749/kualalumpur.2018.0946.

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<p>To address this issue of corrosion of steel in reinforced concrete, large scale columns reinforced with glass fibre reinforced polymer (GFRP) bars were tested under simulated earthquake loads. In addition to the moment - curvature and shear - deflection responses, ductility factors, and work and energy dissipation parameters were used to evaluate column performance. Twenty-five columns with circular and square sections can be compared to investigate variables such as axial load level, amount and type of reinforcement, i.e. GFRP vs steel. GFRP-reinforced columns were found to behave with stable post-peak response and achieved high levels of deformability and energy dissipation. The optimum solution with respect to column strength, stiffness, ductility and energy dissipation, and corrosion resistance appears to be a hybrid column with steel longitudinal bars and GFRP transverse reinforcement.</p>
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Tian, Jingbo, and Wenjun Qu. "Judgement methods of fire resistance time of hybrid reinforced concrete beams." In IABSE Symposium, Guimarães 2019: Towards a Resilient Built Environment Risk and Asset Management. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2019. http://dx.doi.org/10.2749/guimaraes.2019.0955.

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<p>Hybrid reinforced concrete beams have been designed by replacing the steel bars in areas with weak durability with fiber-reinforced plastic bars. This paper suggests the judgement methods of fire resistance time of hybrid reinforced concrete beams by considering about the judgement methods of fire resistance time of steel reinforced concrete beams and FRP reinforced concrete beams that were proposed by scholars and standards of various countries. Six hybrid reinforced concrete beams were subjected to a fire test. The deflection and the temperature of hybrid reinforced concrete beams in the fire test were recorded. These judgement methods suggested by these scholars and standards are applied in judging the fire resistance time of these six hybrid reinforced concrete beams respectively. The results are compared to suggest that almost all the main factors having a great influence on fire resistance time of hybrid reinforced concrete beams are considered by the deformation limitation method, and this method can be taken as the main determinant in the judgement methods. The heat insulation of beams and the average temperatures of the surface of beams cannot be used directly to judge the fire resistance time. The judgement methods are improved by combination of these methods so that the judgement methods can be used for the design.</p>
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Nguyen, Wilson, Gabriel Jen, Jacob F. Duncan, and Claudia P. Ostertag. "Effect of hybrid fiber reinforcement on corrosion-induced damage of reinforced concrete." In 9th International Conference on Fracture Mechanics of Concrete and Concrete Structures. IA-FraMCoS, 2016. http://dx.doi.org/10.21012/fc9.181.

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Min, Jeong-Ki, Peter J. Moss, Anthony K. Abu, Rajesh P. Dhakal, and Andrew H. Buchanan. "Fire Behaviour of Multi-Bay Hollowcore Floors." In 10th International Conference on Advances in Steel Concrete Composite and Hybrid Structures. Singapore: Research Publishing Services, 2012. http://dx.doi.org/10.3850/978-981-07-2615-7_243.

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