Dynamic Fracture Behavior of Steel Fiber Reinforced Self-Compacting Concretes (SFRSCCs)

Zhang, Xiaoxin; Ruiz, Gonzalo; Tarifa, Manuel; Cendón, David A.; Gálvez, Francisco; Alhazmi, Waleed

doi:10.3390/ma10111270

Cited by 12 publications

(12 citation statements)

References 43 publications

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“…These adjustments provide a correlation coefficient higher than 95%. Though the format of such equations is original for plain and steel fiber-reinforced concretes [46][47][48][49], they are still valid for NHL mortars:…”

Section: Loading Rate Effect On the Fracture Behaviormentioning

confidence: 99%

Mechanical Behavior of Natural Hydraulic Lime Mortars

Garijo¹,

Zhang²,

Ruiz³

et al. 2019

Sustainable Construction and Building Materials

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Natural hydraulic lime (NHL) mortars are widely used for restoration works due to their good compatibility with the substrate material in terms of physical, chemical, and mechanical properties. Regarding their mechanical characterization, there is still a need for further understanding of their fracture behavior and the influence of their dosage methodology on the mechanical properties. Thus, this chapter focuses on the mechanical characterization of NHL mortars, such as flexural, compressive, and splitting tensile strengths, elastic modulus, and fracture energy. Moreover, the influence of the composition and production process on such properties was studied as well. Furthermore, the loading rate effect on the fracture behavior was also presented. The results show that NHL mortars have shape and size effect on the compressive strength. In addition, NHL mortar is rate sensitive, mainly due to the viscous effects caused by the presence of free water in the porous structure.

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Section: Loading Rate Effect On the Fracture Behaviormentioning

confidence: 99%

Mechanical Behavior of Natural Hydraulic Lime Mortars

Garijo¹,

Zhang²,

Ruiz³

et al. 2019

Sustainable Construction and Building Materials

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“…After fracture, a linear decreasing cohesive law governs the opening behavior of the cohesive crack. The flexural strength given in Table 1 , is taken as the material’s tensile strength, whereas the apparent fracture energy measured for the deflection up to 3 mm reported by Zhang et al [ 19 ] is used as the specific fracture energy at each loading rate, in other words, the strain-rate effect is implicitly included in the material parameters. The experimental impact–time history is fed to the numerical model as the load input.…”

Section: Results and Discussionmentioning

confidence: 99%

“…They were named as concrete PA, PB and PC for the fiber volume fractions of 0.51%, 0.77% and 1.23%, respectively. It needs to be pointed out that, the same material characterization and experimental tests, except the utilization of strain gages and DIC, were carried out in the work of Zhang et al [ 19 ], therefore we only briefly recount the material characterization herein. The load and strain rate upon crack initiation, the toughness indices and residual strength factors, the crack propagation velocity measurement are subsequently described.…”

Section: Experimental Programmentioning

confidence: 99%

Propagation Speed of Dynamic Mode-I Cracks in Self-Compacting Steel Fiber-Reinforced Concrete

Pan

Zhang

et al. 2020

Materials

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The objective of this study is to measure the crack propagation speed in three types of self-compacting concrete reinforced with steel fibers loaded under four different loading rates. Central-notched prismatic beams with two types of fibers (13 mm and 30 mm in length), three fiber volume ratios, 0.51%, 0.77% and 1.23%, were fabricated. Four strain gages were glued on one side of the specimen notch to measure the crack propagation velocity, a fifth one at the notch tip to estimate the strain rates upon the initiation of a cohesive crack and the stress-free crack. A servo-hydraulic testing machine and a drop-weight impact device were employed to conduct three-point bending tests at four loading-point displacement rates, the former to perform tests at 2.2 μm/s, 22 mm/s and the latter for those at 1.77 m/s, 2.66 m/s, respectively. With lower fiber contents, smooth mode-I cracks were formed, the crack speed reached the order of 1 mm/s and 20 m/s. However, crack velocities up to 1417 m/s were obtained for the concrete with high content of fibers under impact loading. This value is fairly close to the theoretically predicted terminal crack velocity of 1600–1700 m/s. Numerical simulations based on cohesive theories of fracture and preliminary results based on the technique of Digital Image Correlation are also presented to complement those obtained from the strain gages. In addition, the toughness indices are calculated under all four loading rates. Strain hardening (softening) behavior accounting from the initiation of the first crack is observed for all three types of concrete at low (high) loading rates. Significant enhancement in the energy absorption capacity is observed with increased fiber content.

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“…Steel fibre reinforced concrete (SFRC) is a composite material in which steel fibres are randomly oriented and distributed in a concrete matrix. The benefits of fibre addition in energy absorption and toughness, particularly under dynamic loading conditions, are demonstrated in the scientific bibliography (ACI Committee 544 2002; Soufeiani et al 2016;Yu et al 2016;Zhang et al 2017;Poveda et al 2017;Blason et al 2019;Ruiz et al 2018Ruiz et al , 2019. This makes SFRC a suitable material for civil engineering structures, especially when they are subjected to dynamic conditions such as seismic loads, impact or explosions.…”

Section: Introductionmentioning

confidence: 99%

Rate effect in inclined fibre pull-out for smooth and hooked-end fibres: a numerical study

Poveda

Tarifa

et al. 2019

Int J Fract

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Based on a numerical model to simulate the static behaviour of a smooth fibre extracted from a cementitious matrix, a rate dependent friction law, widely used in earthquake engineering for steady-state slip phenomena, is proposed to capture the rate effect observed in dynamic pull-out tests for both smooth and hooked-end fibres. After calibrating the friction coefficients with the experimental results of smooth fibres, the model is subsequently applied to predict the pullout behaviour of both smooth and hooked-end fibres at different inclination angles (0 • , 30 • and 60 • ) loaded at three different velocities (0.01, 0.1 and 1 mm/s). The global tendency of all the pull-out curves was captured, fibre's cross sectional deformations were also reproduced remarkably well. Moreover, the developed model helps to cast light on the different mechanisms related to the pull-out process.

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Dynamic Fracture Behavior of Steel Fiber Reinforced Self-Compacting Concretes (SFRSCCs)

Cited by 12 publications

References 43 publications

Mechanical Behavior of Natural Hydraulic Lime Mortars

Mechanical Behavior of Natural Hydraulic Lime Mortars

Propagation Speed of Dynamic Mode-I Cracks in Self-Compacting Steel Fiber-Reinforced Concrete

Rate effect in inclined fibre pull-out for smooth and hooked-end fibres: a numerical study

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