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Antonio Aguado - One of the best experts on this subject based on the ideXlab platform.
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design of macro synthetic fibre reinforced Concrete pipes
Construction and Building Materials, 2013Co-Authors: Albert De La Fuente, Renata Campos Escariz, Antonio Domingues De Figueiredo, Antonio AguadoAbstract:Abstract This paper presents an experimental campaign in which Concrete pipes were manufactured using plastic fibres as the sole reinforcement material. In this regard, it has been demonstrated that the use of plastic fibres is compatible with pipe production systems, and that, when subjected to the crushing test (CT), plastic fibre reinforced pipes yield strength classes that are attractive in terms of the growth of this material in the Concrete pipe industry. Moreover, the results obtained from both the characterisation of the material and the mechanical behaviour of the pipes have been used to verify that the Model for the Analysis of Pipes (MAPs) is an appropriate tool for the design of such pipes. Finally, this paper presents a direct design methodology which was used to establish the firsts design tables for fibre reinforced Concrete pipes presented in the scientific literature. This methodology can be used to estimate the strength requirements of the fibre reinforced Concrete needed to reach the strength classes set out in EN 1916:2002, without having to resort to the CT as an indirect design method.
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a new design method for steel fibre reinforced Concrete pipes
Construction and Building Materials, 2012Co-Authors: Albert De La Fuente, Renata Campos Escariz, Antonio Domingues De Figueiredo, Climent Molins, Antonio AguadoAbstract:Abstract The use of structural fibres as the main reinforcement of Concrete pipes is known by both the industrial and scientific community as an attractive alternative to the traditional steel bars in a specific range of diameters. However, in spite of the evidence of its viability and even of the existence of standard regulations oriented to these elements, for several reasons their use has not been consolidated yet. In this sense, the lack of design methodologies or tables with a suggested values for the minimum amount of fibres for each internal diameter, thickness and strength class slows down the step forward of the use of FRC in this field. For this reason, a new comprehensive methodology for the design of fibre reinforced Concrete pipes is presented in this paper. This design procedure is based on the use of a numerical model which simulates the mechanical response of fibre reinforced Concrete pipes subjected to crushing test. This model has been previously contrasted with results obtained in different experimental campaigns carried out with pipes with diameter lower than 600 mm. However, for this work, a new experimental campaign which involves the manufacture and testing of fibre reinforced Concrete pipes with diameter of 1000 mm has been carried out so as to validate the MAP and to extend this methodology to larger diameters, for which the use of FRC is a competitive solution.
Joaquim A O Barros - One of the best experts on this subject based on the ideXlab platform.
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recycled steel fibre reinforced Concrete failing in bending and in shear
Construction and Building Materials, 2015Co-Authors: Ziaaddin Zamanzadeh, Lucio Lourenco, Joaquim A O BarrosAbstract:Abstract Recent research is showing that the addition of Recycled Steel Fibres (RSF) from wasted tyres can decrease significantly the brittle behaviour of cement based materials, by improving its toughness and post-cracking resistance. In this sense, Recycled Steel Fibre Reinforced Concrete (RSFRC) seems to have the potential to constitute a sustainable material for structural and non-structural applications. To assess this potential, experimental and numerical research was performed on the use of RSFRC in elements failing in bending and in beams failing in shear. The values of the fracture mode I parameters of the developed RSFRC were determined by performing inverse analysis with test results obtained in three point notched beam bending tests. To assess the possibility of using RSF as shear reinforcement in Reinforced Concrete (RC) beams, three point bending tests were executed with three series of RSFRC beams flexurally reinforced with a relatively high reinforcement ratio of longitudinal steel bars in order to assure shear failure for all the tested beams. By performing material nonlinear simulations with a computer program based on the finite element method (FEM), the applicability of the fracture mode I crack constitutive law derived from the inverse analysis is assessed for the prediction of the behaviour of these beams. The performance of the formulation proposed by RILEM TC 162 TDF and CEB–FIP 2010 for the prediction of the shear resistance of Fibre Reinforced Concrete elements was also evaluated.
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post cracking behaviour of steel fibre reinforced Concrete
Materials and Structures, 2005Co-Authors: Joaquim A O Barros, Vitor M C F Cunha, Alberto F Ribeiro, J A B AntunesAbstract:Recently, RILEM TC 162-TDF has proposed equivalent,f eq , and residual,f R , flexural tensile strength parameters to characterize and simulate the post-cracking behaviour of steel fibre reinforced Concrete (SFRC) structures. In the current work, more than two hundred flexural tests are carried out according to the RILEM TC 162-TDF recommendations and the corresponding values off eq andf R parameters are evaluated. In series of specimens reinforced with fibres of a distinct length/diameter ratio, similar values off eq andf R parameters were obtained in these series. Although a strong correlation betweenf eq andf R was determined, a larger scatter off R values was observed thereby revealingf eq to be more appropriate for design purposes. A numerical strategy involving a cross sectional layered model and an inverse analysis was developed to evaluate the post-cracking stress-strain and the stress-crack opening diagrams for the tested SFRC. This strategy was also used to determine a relation between the post-cracking strain, ɛ pcr , and the crack opening displacement,w, (ɛ pcr =w/L p ) which is useful for evaluating the crack opening when numerical strategies based on a stress-strain approach are used. The obtainedL p values range from half the specimen cross section height to half the distance between the tip of the notch and the top of the cross section.
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experimental characterization of the flexural behaviour of steel fibre reinforced Concrete according to rilem tc 162 tdf recommendations
International RILEM Workshop on Test and Design Methods for Steelfibre Reinforced Concrete, 2003Co-Authors: Joaquim A O Barros, J A B AntunesAbstract:Fundacao para a Ciencia e a Tecnologia (FCT) - POCTI/34793/99. "Cost competitive steel fibre reinforced Concrete for industrial pavements“
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model for the analysis of steel fibre reinforced Concrete slabs on grade
Computers & Structures, 2001Co-Authors: Joaquim A O Barros, Joaquim FigueirasAbstract:Abstract A constitutive model is developed for material non-linear analysis of steel fibre reinforced Concrete slabs supported on soil. The energy absorption capacity provided by fibre reinforcement is taken into account in the material constitutive relationship. The theory of plasticity is used to deal with the elasto-plastic behaviour of Concrete. A smeared-crack model is used for reproducing the Concrete cracking behaviour. The soil non-linear behaviour is simulated by springs on orthogonal direction to the slab. The loss of contact between the slab and the soil is accounted for. The model performance is assessed using results of experimental research.
Albert De La Fuente - One of the best experts on this subject based on the ideXlab platform.
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design of macro synthetic fibre reinforced Concrete pipes
Construction and Building Materials, 2013Co-Authors: Albert De La Fuente, Renata Campos Escariz, Antonio Domingues De Figueiredo, Antonio AguadoAbstract:Abstract This paper presents an experimental campaign in which Concrete pipes were manufactured using plastic fibres as the sole reinforcement material. In this regard, it has been demonstrated that the use of plastic fibres is compatible with pipe production systems, and that, when subjected to the crushing test (CT), plastic fibre reinforced pipes yield strength classes that are attractive in terms of the growth of this material in the Concrete pipe industry. Moreover, the results obtained from both the characterisation of the material and the mechanical behaviour of the pipes have been used to verify that the Model for the Analysis of Pipes (MAPs) is an appropriate tool for the design of such pipes. Finally, this paper presents a direct design methodology which was used to establish the firsts design tables for fibre reinforced Concrete pipes presented in the scientific literature. This methodology can be used to estimate the strength requirements of the fibre reinforced Concrete needed to reach the strength classes set out in EN 1916:2002, without having to resort to the CT as an indirect design method.
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a new design method for steel fibre reinforced Concrete pipes
Construction and Building Materials, 2012Co-Authors: Albert De La Fuente, Renata Campos Escariz, Antonio Domingues De Figueiredo, Climent Molins, Antonio AguadoAbstract:Abstract The use of structural fibres as the main reinforcement of Concrete pipes is known by both the industrial and scientific community as an attractive alternative to the traditional steel bars in a specific range of diameters. However, in spite of the evidence of its viability and even of the existence of standard regulations oriented to these elements, for several reasons their use has not been consolidated yet. In this sense, the lack of design methodologies or tables with a suggested values for the minimum amount of fibres for each internal diameter, thickness and strength class slows down the step forward of the use of FRC in this field. For this reason, a new comprehensive methodology for the design of fibre reinforced Concrete pipes is presented in this paper. This design procedure is based on the use of a numerical model which simulates the mechanical response of fibre reinforced Concrete pipes subjected to crushing test. This model has been previously contrasted with results obtained in different experimental campaigns carried out with pipes with diameter lower than 600 mm. However, for this work, a new experimental campaign which involves the manufacture and testing of fibre reinforced Concrete pipes with diameter of 1000 mm has been carried out so as to validate the MAP and to extend this methodology to larger diameters, for which the use of FRC is a competitive solution.
Spyridon A Paschalis - One of the best experts on this subject based on the ideXlab platform.
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combined non destructive testing ndt method for the evaluation of the mechanical characteristics of ultra high performance fibre reinforced Concrete uhpfrc
Construction and Building Materials, 2017Co-Authors: Ourania Tsioulou, Andreas Lampropoulos, Spyridon A PaschalisAbstract:Abstract Ultra-High Performance Fibre Reinforced Concrete is a material which is becoming increasingly popular in structural applications, mainly due to its superior mechanical characteristics. The mechanical properties of this material are of high importance and the development of non-destructive techniques is vital for the evaluation of the mechanical characteristics of existing structures. In the current study, Ultra-High Performance Fibre Reinforced Concrete with different amounts of steel fibres has been examined. Compressive and tensile tests have been conducted alongside with Ultrasonic Pulse Velocity and Rebound Hammer measurements and the development of appropriate empirical non-destructive models has been examined.
Qiang Fu - One of the best experts on this subject based on the ideXlab platform.
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fractal characteristics of pore structure of hybrid basalt polypropylene fibre reinforced Concrete
Cement & Concrete Composites, 2020Co-Authors: Dan Li, Qiang FuAbstract:Abstract The pore characteristics of hybrid basalt–polypropylene Fibre-Reinforced Concrete (HBPRC) are investigated using mercury intrusion porosimetry. The research results indicate that the cumulative pore volume of Concrete increases with fibre addition. The pore surface fractal dimension (DS) of HBPRC in gel, capillary, and large pore regions decreases sequentially although it has no physical characteristics in a transition pore region. The incorporation of fibres has an insignificant effect on DS in gel and capillary pore regions; however, it has a reducing effect on DS in the large pore region. Furthermore, the greater the Concrete strength, the larger DS becomes and the greater the reducing effect of fibres on DS in the large pore region. Through microscopic and mesoscopic analyses, it has been suggested that bubbles introduced by fibres and the weak dispersion of such fibres are the main reasons for the deterioration of the large pore structure of HBPRC.
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dynamic compressive mechanical behaviour and modelling of basalt polypropylene fibre reinforced Concrete
Archives of Civil and Mechanical Engineering, 2018Co-Authors: Qiang Fu, Jian Zhang, Daguan Huang, Yan Wang, Mengshu Hong, Lu ZhangAbstract:Abstract Dynamic compressive behaviour of basalt–polypropylene Fibre-Reinforced Concrete (BPFRC) was experimentally investigated using a 75-mm-diameter split-Hopkinson pressure bar. The results showed that the addition of basalt fibre (BF) and polypropylene fibre (PF) is effective at improving the impact-resistance behaviour of Concrete. The dynamic compressive strength, critical strain, and energy absorption capacity of BPFRC increased with increasing strain rate. At strain rates of 20–140 s−1, the addition of BF and PF significantly increased the dynamic compressive strength, critical strain, and energy absorption capacity of Concrete. The dynamic increase factor of BPFRC increased linearly with the decimal logarithm of strain rate. The hybrid addition of BF and PF significantly improved the strain rate effect of the dynamic compressive strength. The strengthening and toughening mechanisms of BF and PF are discussed in detail. The proposed dynamic damage constitutive model can be used to accurately describe the dynamic stress–strain relationship of BPFRC.