Analysis of the resistance to fire of solid concrete boards with polypropylene microfibers and long curing time

Manica, Gustavo; Bolina, Fabrício Longhi; Tutikian, Bernardo Fonseca; Valadares, Matheus

doi:10.7764/rdlc.18.3.595

Cited by 4 publications

(4 citation statements)

References 4 publications

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“…Los componentes de hormigón armado con un tiempo de curado prolongado tienden a no despegarse a altas temperaturas, porque la transferencia de calor en el hormigón se ve afectada principalmente por los materiales que componen sus componentes. Cuando se expone al fuego, la presencia de microfibras de polipropileno es beneficiosa para el hormigón (Manica et al, 2019;Lubloy, 2020).…”

Section: Propiedades Térmicas Del Hormigónunclassified

Efectos Del Fuego Sobre La Resistencia De Elementos Estructurales De Hormigón Armado: Una Revision De Literatura

et al. 2021

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El fuego en la estructura hace que aumente la temperatura de la superficie del hormigón, reduciendo así su resistencia a la compresión, flexión y el módulo elástico. Aunque el hormigón tiene un conductor más pobre que el acero, la alta temperatura constante en la superficie provoca el calentamiento gradual en su capa interior. Como material de construcción, el hormigón se usa ampliamente debido a su alta resistencia al fuego, es esencial para resistir uno de los desastres más severos que una estructura puede soportar en su vida. El presente documento tiene como objetivo realizar una revisión sistemática de los efectos que tiene el fuego en las propiedades mecánicas y térmicas de las estructuras de hormigón armado. Se revisaron 50 artículos publicados en base de datos indexadas entre los años 2011 y 2021, distribuidos de la siguiente manera: 28 en Scopus, nueve en Web of Science, ocho en Scielo, tres en ScienceDirect y dos en EBSCO, referentes al hormigón resistente al fuego, temperaturas altas, propiedades mecánicas y conductividad térmica. Para poder comprender el impacto que tiene el fuego en la resistencia de elementos estructurales de hormigón armado se presentaron los resultados de estudios elaborados en el ámbito. Se concluye que los principales efectos del fuego sobre el hormigón armado fueron: 1) disminución en la adherencia entre el hormigón y el acero 2) rotura del hormigón y 3) reducción de la resistencia del hormigón y el acero. Palabras claves: conductividad térmica – efecto del fuego en el hormigón armado – propiedades mecánicas del hormigón armado

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Section: Propiedades Térmicas Del Hormigónunclassified

Efectos Del Fuego Sobre La Resistencia De Elementos Estructurales De Hormigón Armado: Una Revision De Literatura

et al. 2021

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“…Fiber addition reduces the compressive strength of roller compacted concrete but significantly improves the post-peak bending behavior (Neocleous, Angelakopoulos, Pilakoutas, & Guadagnin, 2011). Although polypropylene fiber reduces the compressive strength of concrete, it is beneficial for fire resistance by providing higher thermal insulation, controlling internal pressure and hindering heat transfer with increased amount of voids in the structure (Manica, Bolina, Tutikian, & Valadares, 2019). Karahan et al stated that mortars containing PP fiber exhibit better performance at elevated temperatures up to 400°C in terms of relative residual strengths (Karahan, Durak, Ilkentapar, Atabey, & Atis, 2019).…”

Section: Introductionmentioning

confidence: 99%

Strength and durability of roller compacted concrete with different types and addition rates of polypropylene fibers

Kiliç

Gök

2021

rdlc

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Roller compacted concrete (RCC) is a relatively new alternative construction material that can be used in road and dam constructions by allowing rapid use after production and the use of conventional building materials in production. RCC, which can be produced with low water/cement ratio, is one of the rigid road pavement types and shows similarity to flexible road pavements with the production technique. Different types of fibers such as steel and polypropylene (PP) are used in concrete roads with the aim of preventing cracks, reducing the pavement thickness and increasing the permissible joint gap. In this study, flexural strength, compressive strength, unit weight, water absorption, ultrasonic pulse velocity, modulus of elasticity and freeze-thaw resistance were determined in roller compacted concretes produced by using two different polypropylene-based fibers. In RCC design, fiber addition was insufficient to improve concrete properties in terms of strength and durability. It has been observed that there was a 14.4% reduction in compressive strength with 0.20% fiber inclusion, and a 46.8% reduction in compressive strength with 0.50% fiber inclusion. Polypropylene fiber inclusion increased the water absorption percentages and decreased the specific weights of fiber reinforced roller compacted concretes. However, roller compacted concretes produced with PP-fiber exhibited a good performance under freeze-thaw attack.

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“…Whenever there is a crack in concrete, the randomly oriented fibers arrest the crack propagation, therefore, enhancing the strength of concrete (Asare, Peter, & Francis, 2016). The inclusion of fibre in concrete have been reported to cause significant reduction of concrete pore pressure, thus preventing spalling in such concrete (Manica, Bolina, Tutikian, & Valad, 2019). Fibres are the friendliest environmental construction material which offers stability and flexibility in designing all building structures.…”

Section: Introductionmentioning

confidence: 99%

“…The integrity of concrete is often called to question since after such outbreak the strength of such concrete reduces substantially. Fire has considerable effect on concrete by reducing its mechanical strength and compromising user safety (Manica et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Thermal resistance of raffia palm reinforced concrete

Odeyemi

Giwa

2021

rdlc

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There are increasing interests in the usage of natural fibres as reinforcing component for concrete production due to their enormous properties such as low cost, its abundance and availability. This research examined the thermal resistance of Raffia palm fibre reinforced concrete. In this study, 0% to 1% fibre content by weight of cement were incorporated in concrete and their compressive strength were tested after heating. A total number of 36 cubes were prepared, cured and tested at 28 days. Concrete cubes with 0% fibre was used as control specimen. The cubes’ compressive strengths were determined at 0 0C, 556 0C and 659 0C at 0 minutes, 5 minutes and 10 minutes respectively. The result revealed that workability of the concrete declined with a rise in the percentage of raffia palm. There is also a substantial surge in the compressive strength of raffia palm fibre reinforced concrete cubes (RPFRC) compared to the control concrete samples. The compressive strength of the concrete cubes decreased with the rise in temperature for the entire samples tested. It was concluded that a rise in the proportion of fibre in the concrete enhanced their compressive strengths when subjected to heat.

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Analysis of the resistance to fire of solid concrete boards with polypropylene microfibers and long curing time

Cited by 4 publications

References 4 publications

Efectos Del Fuego Sobre La Resistencia De Elementos Estructurales De Hormigón Armado: Una Revision De Literatura

Efectos Del Fuego Sobre La Resistencia De Elementos Estructurales De Hormigón Armado: Una Revision De Literatura

Strength and durability of roller compacted concrete with different types and addition rates of polypropylene fibers

Thermal resistance of raffia palm reinforced concrete

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