Residual Mechanical Properties and Durability of High-Strength Concrete with Polypropylene Fibers in High Temperatures

Resende, Heron Freitas; Reis, Elvys Dias; Arroyo, Felipe Nascimento; Moraes, Matheus Henrique Morato de; Santos, Herisson Ferreira dos; Silva, Enio Gomes da; Lahr, Francisco Antônio Rocco; Chahud, Eduardo; Panzera, Túlio Hallak; Christofóro, André Luis; Branco, Luiz Antônio Melgaço Nunes

doi:10.3390/ma15134711

Cited by 4 publications

(2 citation statements)

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“…Resende [53] found that adding polypropylene fibers to the cement matrix at 100-200 ℃ (polypropylene fiber dosing of 2 kg/m3 ) increases the tensile strength of HSC, and the increase in tensile strength is more significant at the latter (at 200 ℃ ), above 400 ℃ , doping polypropylene fibers in HSC decreases its tensile strength; below 400℃, doping polypropylene fibers is beneficial to increase the compressive strength of HSC, and above 400℃, the doping of polypropylene fibers decreases the compressive strength of HSC.…”

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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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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“…There are several ways to protect OPC concrete structures. The incorporation of polypropylene fibers led to improved fire resistance of high-strength concretes based on OPC [3]. At 200-250 • C, the fiber helps to release moisture from the concrete, which reduces explosive spalling.…”

Section: Introductionmentioning

confidence: 99%

Alkali-Activated Slag Coatings for Fire Protection of OPC Concrete

Kielė,

Vaičiukynienė,

Bertašius

et al. 2023

Materials

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During a fire, ordinary Portland cement (OPC) systems lose their mechanical properties. For this reason, it is important to find a way to protect it. This study suggested alternative uses of slag and phosphogypsum to produce coatings for fire-resistant applications. Five compositions of 10 mm thick alkali-activated slag coatings were investigated. In these compositions, different amounts of phosphogypsum (1%, 3%, 5%, 7%, and 10%) were used. In the first stage of this study, the residual compressive strength of samples with the coatings based on alkali-activated slag was compared to the results of OPC concrete samples without coatings. The experimental results showed that a higher residual compressive strength of 33.2–47.3 MPa OPC concrete was achieved for the samples with coatings. Meanwhile, the residual compressive strength of the uncoated samples was 32.37 MPa. In the second stage, OPC concrete samples were reinforced with fiberglass polymer (FRP) rods, and they had a similar positive effect on alkali-activated coatings. After exposure to higher temperatures, the pullout tests of the glass FRP bars showed that the adhesion strength was (9.44 MPa) 43.9% higher for the samples with coatings compared to the samples without coatings (6.56 MPa). Therefore, a higher bond strength can be maintained between concrete and FRP bars. Alkali-activated slag with 3% phosphogypsum can be used for the production of fire-resistant coating. These coatings could protect OPC concrete and reinforced concrete with glass FRP bars from fire.

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