Numerical simulation of polypropylene fibres in concrete materials under fire conditions

Mazzucco, Gianluca; Majorana, C. E.; Salomoni, Valentina

doi:10.1016/j.compstruc.2015.03.012

Cited by 49 publications

(18 citation statements)

References 19 publications

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“…In order to take into account the effect of PP fibres, concrete porosity formulation has been enriched and the microcracking that appears after PP fibres vaporization around the void channels has been considered [5].…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…In this work, the complex mechanism of polypropylene contribution on concrete behaviour under thermal conditions will be numerically investigated through a 3D thermohygromechanical finite element code [3,4], appropriately updated to take into account the effect of the polypropylene fibres if they are added in the mix design [5]. Innovative concrete systems are investigated in [6,7].…”

Section: Introductionmentioning

confidence: 99%

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Fire Spalling Prevention via Polypropylene Fibres: A Meso- and Macroscale Approach

Mazzucco

Xotta

2016

Modelling and Simulation in Engineering

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A deep understanding of concrete at the mesoscale level is essential for a better comprehension of several concrete phenomena, such as creep, damage, and spalling. The latter one specifically corresponds to the separation of pieces of concrete from the surface of a structural element when it is exposed to high and rapidly rising temperatures; for this phenomenon a mesoscopic approach is fundamental since aggregates performance and their thermal properties play a crucial role. To reduce the risk of spalling of a concrete material under fire condition, the inclusion of a low dosage of polypropylene fibres in the mix design of concrete is largely recognized. PP fibres in fact evaporate above certain temperatures, thus increasing the porosity and reducing the internal pressure in the material by an increase of the voids connectivity in the cement paste. In this work, the contribution of polypropylene fibres on concrete behaviour, if subjected to elevated thermal ranges, has been numerically investigated thanks to a coupled hygrothermomechanical finite element formulation. Numerical analyses at the macro-and mesoscale levels have been performed.

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Section: Theoretical Backgroundmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fire Spalling Prevention via Polypropylene Fibres: A Meso- and Macroscale Approach

Mazzucco

Xotta

2016

Modelling and Simulation in Engineering

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“…It was generally believed that the melting of PP fibers creates pathway by connecting the porous ITZs between the aggregates and the matrix, thus increasing the permeability of concrete at elevated temperature as illustrated in Fig. 6.10 (a) (Mazzucco, Majorana and Salomoni 2015). In normal mortars and concretes, ITZ occupies a significant fraction of the total paste volume.…”

Section: Schematic Illustration Of Influence Of Pp Fibers and Larger mentioning

confidence: 99%

“…hypothesized that percolation of interfacial transition zones (ITZ) by PP fibers is the mechanism for improvement of permeability of concrete at high temperature. The ITZs of the fibers connect the ITZs of the aggregates creating a connected network system for moisture flow Mazzucco, Majorana and Salomoni (2015). numerically evaluated the mechanism of polypropylene contribution on permeability of concrete under thermal conditions through a coupled hygro-thermal-mechanical finite element formulation.…”

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confidence: 99%

“…Model of residual permeability of UHPC with PPPrevious studies have attempted to model the permeability of cement-based materials(Abyaneh, Wong and Buenfeld 2016, Li, Stroeven, Stroeven and Sluys 2016, Mazzucco, Majorana and Salomoni 2015, Neithalath, Sumanasooriya and Deo 2010, Song, Pack, Nam, Jang and Saraswathy 2010, Tran, Meftah, Izoret and Behloul 2013. The well-known model is a function of porosity and specific surface area of a homogeneous percolated porous media(Chandrappa and Biligiri 2016).…”

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confidence: 99%

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Material properties and explosive spalling of ultra-high performance concrete in fire

Li¹

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Ultra-High Performance Concretes (UHPC) has high strength (greater than 150 MPa), high durability, and enhanced fracture energies due to its densely packed microstructure and very low permeability. However, these good features make UHPC more vulnerable to explosive spalling in fire condition. Explosive spalling is generally characterized by a forcible removal of pieces or layers of concrete from the heated surface of a structural element. It compromises the load-carrying capacity of structures because it involves loss of integrity of structures, loss of concrete cross section, and exposure of steel reinforcements to fire. Several mechanisms responsible for explosive spalling have been proposed by a number of researchers. However, the exact mechanism for spalling of UHPC is not yet widely understood or accepted. This work was aimed at investigating the behavior of UHPC at elevated temperature, especially explosive spalling of UHPC. The main factors involved are polypropylene fiber, polyethylene fiber, steel fiber, and aggregate size. Firstly, an experimental study was carried out to identify control UHPC matrix by Taguchi method. Secondly, residual mechanical properties of UHPC with PP fibers, steel fibers, and larger aggregates after exposure to elevated temperature (from 300 ℃ to 900 ℃) and after water quenching were investigated. Subsequently, the effects of polyethylene (PE)-steel fiber hybridization, water-to-binder ratio, and aggregate size on flexural performance of UHPC were investigated. The microstructure and phase change were investigated by means of field emission scanning electron microscope (FESEM) and X-ray diffraction (XRD). Thereafter, the focus was switched to transport properties of UHPC. The influence of aggregate size and inclusion of PP and steel fibers on the intrinsic permeability of UHPC at hot state was first investigated. Then, the effects of fiber fraction, geometry, and induced microcracks on the intrinsic residual permeability of UHPC were investigated in detail. A model was proposed to predict residual permeability of UHPC based on image processing and quantification of microcracks.

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Compared Environmental Impact Analysis of Alfa and Polypropylene Fibre-Reinforced Concrete

Khelifa

Ziane

Mezhoud

et al. 2021

Iran J Sci Technol Trans Civ Eng

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Numerical simulation of polypropylene fibres in concrete materials under fire conditions

Cited by 49 publications

References 19 publications

Fire Spalling Prevention via Polypropylene Fibres: A Meso- and Macroscale Approach

Fire Spalling Prevention via Polypropylene Fibres: A Meso- and Macroscale Approach

Material properties and explosive spalling of ultra-high performance concrete in fire

Compared Environmental Impact Analysis of Alfa and Polypropylene Fibre-Reinforced Concrete

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