On explicit modeling of polypropylene fiber effects on hydro-thermal behavior of heated concrete

Tran, V.H.; Meftah, Fékri; Izoret, Laurent; Behloul, Mouloud

doi:10.1051/matecconf/20130605007

Cited by 4 publications

(4 citation statements)

References 11 publications

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“…59,60 Fiber connectivity results from the arrangement and percolation of fiber clusters which generate randomly according to their gradation. [61][62][63][64][65][66] Based on polypropylene fiber percolation model developed by Tran et al, 67 concrete is treated as a composite of fibers and concrete matrix arranged in series or parallel with the fluid flow, and its permeability can be equated as: 64 based on their experimental results. For the cases in which fiber tunnels are totally percolated (i.e.…”

Section: High-temperature Materials Propertiesmentioning

confidence: 99%

“…Based on polypropylene fiber percolation model developed by Tran et al, 67 concrete is treated as a composite of fibers and concrete matrix arranged in series or parallel with the fluid flow, and its permeability can be equated as:

k = p {normalk}_{fm}^{normalP} + (1 - p) {normalk}_{fm}^{NP}

where p = is the probability of percolation of fiber tunnels, k fm P corresponds to the combined permeability of fibers and concrete matrix when fiber tunnels and UHPC matrix are in parallel with fluid flow, and k fm NP corresponds to the combined permeability of fibers and concrete matrix when fiber tunnels and UHPC matrix are in series with fluid flow. The fiber percolation probability ‘p’ is dependent on PP fiber dosage (ϕ), length of fiber (l f ), and diameter of fiber (d f ), and can be modeled as:

p = α {normalϕ}^{normala} {l_{f}}^{normalb} {d_{f}}^{normalc}

where α = 10 −20 , a = 0.91, b = 2.78, c = −5.37.…”

Section: Numerical Model For Predicting Fire Response Of Uhpc Beamsmentioning

confidence: 99%

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Numerical model for tracing the response of Ultra‐High performance concrete beams exposed to fire

Banerji

Kodur

2022

Fire and Materials

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This paper presents a numerical procedure for evaluating the thermo-mechanical response of Ultra-High Performance Concrete (UHPC) beams exposed to fire. The numerical model is based on a macroscopic finite element formulation and utilizes sectional moment-curvature relations to trace the response of UHPC beams from the linear elastic stage to collapse under combined effects of fire and structural loading. Fire-induced spalling, temperature-dependent properties of concrete and steel reinforcement, and realistic failure criteria are incorporated into the analysis. Specifically, an advanced analysis approach for evaluating spalling is incorporated in the model by considering the stresses arising from the combined effects of thermal gradients, structural loading, and pore pressure generated in the concrete section. Comparisons of the predictions from the model with data from fire resistance experiments show a good correlation, indicating the proposed model can reliably predict the thermo-mechanical response, including the extent of spalling in UHPC beams subjected to fire exposure. The applicability of the model for undertaking advanced analysis is shown by conducting a case study to illustrate the influence of load level and fire scenario on the fire response of the UHPC beams.

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Section: High-temperature Materials Propertiesmentioning

confidence: 99%

k = p {normalk}_{fm}^{normalP} + (1 - p) {normalk}_{fm}^{NP}

p = α {normalϕ}^{normala} {l_{f}}^{normalb} {d_{f}}^{normalc}

where α = 10 −20 , a = 0.91, b = 2.78, c = −5.37.…”

Section: Numerical Model For Predicting Fire Response Of Uhpc Beamsmentioning

confidence: 99%

Numerical model for tracing the response of Ultra‐High performance concrete beams exposed to fire

Banerji

Kodur

2022

Fire and Materials

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“…5.3). The elements simulating cracks were assumed to be straight with identical shapes in the percolation model (Li and Zhang 2009, Tran et al 2013, Gu et al 2016. It was also assumed that the elements were dispersed uniformly in the UHPC samples.…”

Section: Percolation Modelmentioning

confidence: 99%

Spalling resistance of fiber embedded ultra-high performance concrete

Zhang¹

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“…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%

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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On explicit modeling of polypropylene fiber effects on hydro-thermal behavior of heated concrete

Cited by 4 publications

References 11 publications

Numerical model for tracing the response of Ultra‐High performance concrete beams exposed to fire

Numerical model for tracing the response of Ultra‐High performance concrete beams exposed to fire

Spalling resistance of fiber embedded ultra-high performance concrete

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

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