The Role of Polypropylene Microfibers in Thermal Properties and Post-Heating Behavior of Cementitious Composites

Irshidat, Mohammad R.; Al‐Nuaimi, Nasser; Rabie, Mohamed

doi:10.3390/ma13122676

Cited by 13 publications

(5 citation statements)

References 28 publications

(71 reference statements)

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“…In addition, some studies found that fibers have a specific effect on the durability of cement-based composites at a certain amount of fiber [ 26 , 27 , 28 ]. Nam et al [ 29 , 30 ] tested the PVA fiber within a specific dosage range to improve cement-based composites’ frost resistance.…”

Section: Introductionmentioning

confidence: 99%

Frost Resistance Investigation of Fiber-Doped Cementitious Composites

Zou

et al. 2022

Materials

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Fibers used as reinforcement can increase the mechanical characteristics of engineering cementitious composites (ECC), but their frost resistance has received less attention. The mechanical properties of various fiber cementitious materials under the dual factors of freeze-thaw action and fiber dose are yet to be determined. This study examines the performance change patterns of cementitious composites, which contain carbon fiber, glass fiber, and polyvinyl alcohol (PVA) fiber at 0%, 0.5%, and 1% volume admixture in freeze-thaw tests. Three fiber cement-based materials are selected to do the compression and bending testing, and ABAQUS finite element modeling is used to assess the performance of fiber cement-based composite materials. The microscopic observation results show that the dispersion of glass and PVA fibers is higher than that of carbon fibers. As a result, the mechanical characteristics of the fiber-doped cementitious composites increase dramatically after freeze-thaw with increasing dosage. The compression test results show the frost resistance of carbon fiber > PVA fiber > glass fiber. In addition, the bending test results show the frost resistance of carbon fiber > glass fiber > PVA fiber. The 3D surface plots of the strength changes are established to observe the mechanical property changes under the coupling effect of admixture and freeze-thaw times. ABAQUS modeling is used to predict the strength of the cementitious composites under various admixtures and freeze-thaw cycles. The bending strength numerical equation is presented, and the bending and compressive strengths of three different fiber-cement matrix materials are accurately predicted.

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Section: Introductionmentioning

confidence: 99%

Frost Resistance Investigation of Fiber-Doped Cementitious Composites

Zou

et al. 2022

Materials

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“…Some differences were registered in the residual thermal conductivity decrements at 400 °C, in which PPFRC presented slightly lower loss of ambient values than other concretes. However, the measured damage in thermal conductivities was almost the same for all specimens at 600 °C and 800 °C [63], though the decrease in ambient thermal conductivities seems accentuated at 800 °C (47% -48%) compared to 600 °C (24% -25%) and 400 °C (5% -15%). The incorporation of PP fibers is shown to be beneficial for the residual thermal conductivity at 400 °C then other FRC and NC concretes.…”

Section: Thermal Conductivity Resultsmentioning

confidence: 80%

The Efficiency of Non-Destructive Testing to Estimate the Damage Level of Fiber-Reinforced Concrete Exposed to High Temperatures

Nefoussi

Ezziane

Siad

et al. 2023

MSF

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The feasibility of determining the extent of damage in fibered concrete after being subjected to high temperatures, using non-destructive methods was investigated. The study was conducted on four concrete mixtures with different fiber types. The specimens underwent a curing process at 23 °C before being exposed to different high temperatures of 400 °C, 600 °C, and 800 °C. After cooling to ambient temperature, various non-destructive tests including ultrasonic pulse velocity testing (UPV), the resonance frequency test (RF), the dynamic modulus of elasticity (Ed), the thermal conductivity test (λ), and Schmid Rebound Hammer (SRH), were performed. To evaluate the sensitivity of non-destructive techniques to assess the damage of fiber-reinforced concrete, the Lemaitre coefficient was used as a variable to describe the extent of the damage. The results indicated that the highest damage levels were obtained through the modulus of elasticity technique regardless of the type of concrete mixture or temperature exposure. There was also a potential agreement found between thermal and ultrasonic methods in evaluating the thermal degradation of concrete.

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“…If the melting point of polypropylene fibers is exceeded, the fibers melt and create extra voids in the microstructure of the concrete. These extra voids negatively affect the mechanical strengths of the mortar, but can enhance spalling resistance [ 47 ]. The ingredients for the production of polypropylene fibers can be obtained from waste materials.…”

Section: Introductionmentioning

confidence: 99%

Comparative Analysis of Waste, Steel, and Polypropylene Microfibers as an Additive for Cement Mortar

et al. 2023

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This study presents the results of laboratory experiments conducted to determine the mechanical parameters for cement mortar with various quantities of waste fibers, polypropylene microfibers, and steel microfibers. Waste fibers were used as samples and obtained using an end-of-life car tire recycling process. For comparison, samples with the addition of steel and polypropylene microfibers were tested. The same degrees of fiber reinforcement were used for all types of fibers. Ultimately, 22 mixtures of cement mortar were prepared. The aim of this study is therefore to present and compare basic mechanical parameter values. Compressive strength, flexural strength, fracture toughness, and flexural toughness were of particular interest. A three-point bending test was performed on three types of samples, without a notch and with a notch of 4 and 8 mm. The results show that the use of steel microfibers in the cement mortar produces a product with better properties compared to a mixture with steel cord or polypropylene fibers. However, the cement mortar with the steel cord provides better flexural strength and greater flexural toughness factors compared to the cement mortar with polypropylene fibers. This means that the steel cord is a full-value ecological replacement for different fibers.

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The Role of Polypropylene Microfibers in Thermal Properties and Post-Heating Behavior of Cementitious Composites

Cited by 13 publications

References 28 publications

Frost Resistance Investigation of Fiber-Doped Cementitious Composites

Frost Resistance Investigation of Fiber-Doped Cementitious Composites

The Efficiency of Non-Destructive Testing to Estimate the Damage Level of Fiber-Reinforced Concrete Exposed to High Temperatures

Comparative Analysis of Waste, Steel, and Polypropylene Microfibers as an Additive for Cement Mortar

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