Effect of polypropylene fibers on the fracture behavior of heated ultra-high performance concrete

Ríos, José D.; Cifuentes, Héctor; Leiva, Carlos; Ariza, Manuel R. Gómez; Ortiz, Michael

doi:10.1007/s10704-019-00407-4

Cited by 10 publications

(3 citation statements)

References 48 publications

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“…For instance, the values of I 20 for PC beams reached 40 when loaded at 22 mm/s, this indicates, at the deflection of 10.5δ, the beam had absorbed 40 times the energy absorbed at the deflection of δ, when the first crack was formed. Similar toughness indices were reported by Ríos et al [26] for ultra-high performance concrete with polypropylene fibers tested at room temperature. By contrast, the values of I 20 for PA and PB reached 20 and 30, respectively.…”

Section: The Failure Patterns Measured Toughness Indices and Residual Strength Factorssupporting

confidence: 88%

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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Section: The Failure Patterns Measured Toughness Indices and Residual Strength Factorssupporting

confidence: 88%

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

Pan

Zhang

et al. 2020

Materials

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“…Polypropylene fibers range from 20 to 50 µm in diameter and 40 mm in length. They were added to enhance flexural strength (12).…”

Section: Methodsmentioning

confidence: 99%

Experimental study of a noise reducing barrier made of fly ash

et al. 2021

Self Cite

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Although fly ash is commonly used as an additive to cement, large amounts of this material are disposed in landfills. To mitigate, it would be interesting to develop new products in which fly ash can be easily used and required in large quantities. In this work, fly ash is added to manufacture eco-friendly materials with acceptable acoustic and non-acoustic properties and a low cost. We built a barrier composed of fly ash (60 wt.%), type II Portland cement (25 wt.%), vermiculite (14.5 wt.%) and polypropylene fibers (0.5 wt.%). The barrier complied with the mechanical requirements of European standards. The sound absorption coefficient and the airborne sound insulation were determined in a reverberation room, and the barrier was classified as A2 and B3. No leaching problems were observed.

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“…After the high temperature, the best performance was achieved when the PPF length was 9 mm, and the dosage was 0.5 kg/m3. Based on the experimental data, Ríos [52] determined the relationship between the macroscopic behavior (mechanical and fracture behavior) and the microstructure (pore size, number, and distribution). The results showed that incorporating PP fibers significantly increased the maximum pore size and the total porosity slightly.…”

Section: Polypropylene Fiber Concretementioning

confidence: 99%

Research Status and Outlook on High Temperature Performance of Fiber Concrete

Wu,

Miao,

et al. 2024

SJT

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Fiber concrete is a novel composite material that has widespread use in the construction industry. However, high-temperature environments can cause severe damage to concrete structures. Therefore, it is essential to study the refractory properties and microscopic changes of fiber concrete under such conditions. This paper reviews the current research status of steel fiber concrete, polypropylene fiber concrete, and hybrid fiber concrete, which are commonly used in practical engineering, and summarizes their respective roles in concrete by combining theory and practice. The review also looks forward to future research directions and development trends to provide a reference for related research. Studies have demonstrated that adding a suitable amount of fibers can significantly enhance the high-temperature performance of concrete. However, different fiber types have varying effects on concrete. The high-temperature performance of fiber concrete is also influenced by various factors, including concrete mix ratio, fiber type, and admixture. Future research should focus on investigating the mechanism and microscopic changes in the high-temperature performance of fiber concrete, developing new fiber materials, optimizing concrete mixing ratios, and exploring the application of fiber concrete in practical engineering.

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Effect of polypropylene fibers on the fracture behavior of heated ultra-high performance concrete

Cited by 10 publications

References 48 publications

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

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

Experimental study of a noise reducing barrier made of fly ash

Research Status and Outlook on High Temperature Performance of Fiber Concrete

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