Behavior of UHPFRC at High Temperatures

Pimienta, Pierre; Mindeguia, Jean‐Christophe; Simon, Alain; Behloul, Mouloud

doi:10.1002/9781118557839.ch40

Cited by 15 publications

(10 citation statements)

References 5 publications

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“…However, cracks [0.3-0.5 mm (0.012-0.020 in)] were observed at the specimen's surface. Furthermore, disintegration of UHPC mechanical properties was observed due to dehydration of calcium silicate hydrate products, chemical decomposition of UHPC materials and thermal expansive damage (Way and Wille 2012;Pimienta et al 2012). It was observed that UHPC with 0.6 % PP fibers by volume mixture achieved weight loss of less than 9 % at 1000°C (1832°F) (Heinz et al 2004).…”

Section: Freeze-thaw Damage and Surface Scalingmentioning

confidence: 99%

Ultra-High Performance Concrete: Mechanical Performance, Durability, Sustainability and Implementation Challenges

Abbas

Nehdi

Saleem

2016

Int J Concr Struct Mater

321

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In this study, an extensive literature review has been conducted on the material characterization of UHPC and its potential for large-scale field applicability. The successful production of ultra-high performance concrete (UHPC) depends on its material ingredients and mixture proportioning, which leads to denser and relatively more homogenous particle packing. A database was compiled from various research and field studies around the world on the mechanical and durability performance of UHPC. It is shown that UHPC provides a viable and long-term solution for improved sustainable construction owing to its ultrahigh strength properties, improved fatigue behavior and very low porosity, leading to excellent resistance against aggressive environments. The literature review revealed that the curing regimes and fiber dosage are the main factors that control the mechanical and durability properties of UHPC. Currently, the applications of UHPC in construction are very limited due to its higher initial cost, lack of contractor experience and the absence of widely accepted design provisions. However, sustained research progress in producing UHPC using locally available materials under normal curing conditions should reduce its material cost. Current challenges regarding the implementation of UHPC in full-scale structures are highlighted. This study strives to assist engineers, consultants, contractors and other construction industry stakeholders to better understand the unique characteristics and capabilities of UHPC, which should demystify this resilient and sustainable construction material.

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Section: Freeze-thaw Damage and Surface Scalingmentioning

confidence: 99%

Ultra-High Performance Concrete: Mechanical Performance, Durability, Sustainability and Implementation Challenges

Abbas

Nehdi

Saleem

2016

Int J Concr Struct Mater

321

View full text Add to dashboard Cite

show abstract

“…It was also observed that after exposure to high temperatures, cracks of 0.3—0.5 mm in width were formed on the surfaces of the samples [13]. It was also found that the mechanical properties of UHPC decrease due to its chemical decomposition, dehydration of calcium silicate hydrate products, and expansive thermal damage [27,28]. Other studies have reported that the addition of steel fibres might reduce explosive spalling and raise the fire resistance of high-strength concrete (HSC) columns [15].…”

Section: Introductionmentioning

confidence: 99%

“…The effects of high temperature on the physical and mechanical properties of steel/polypropylene fibre-reinforced UHPC were investigated by some researchers [13,24,25,26,27,28,30,31]. However, the compressive strength or tensile splitting strength measured at the first peak may be insufficient to describe the behaviour of the UHPC with fibres, as the conclusions based on testing the peak strength values may be misleading.…”

Section: Introductionmentioning

confidence: 99%

Study of Toughness and Macro/Micro-Crack Development of Fibre-Reinforced Ultra-High Performance Concrete After Exposure to Elevated Temperature

Smarzewski

2019

Materials

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This study has investigated the changes that might appear in post-peak flexural response. Before the flexural test, prismatic specimens were placed in a furnace chamber and exposed to elevated temperatures of 400, 600, and 800 °C. The flexural toughness test was carried out on two types of concrete: Plain ultra-high performance concrete (UHPC) and UHPC with different types of fibres (steel fibre (SF) and polypropylene fibre (PPF)) at 0.5%, 1%, 1.5%, and 2% volume fractions. During the flexural test in the macro-crack development analysis, the non-contact ARAMIS system was used to perform three-dimensional measurements of strain and displacement. The results of scanning electron microscope (SEM) observations of micro-crack development in UHPC without and with SF/PPF were also presented. The experimental results showed that in some cases, the load–deflection curve of fibre-reinforced UHPC displayed a double-peak response. The first peak signified the UHPC properties, while the second peak represented the properties of the fibres. Under flexural load, the toughness decreased as the temperature increased. Significant decrease in the load–deflection response and toughness were observed for the polypropylene fibre-reinforced UHPC when the temperature approached 800 °C. The SEM observation results showed that the thermal damage of fibre-reinforced UHPC depends on the pore pressure effect, the thermal mismatch, the decomposition of hydration products, and the formation of micro-cracks.

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“…3). [7] have shown hot tested compressive strength of ultra high performance fibre reinforced concretes (UHPFRC -Ductal) values are lower than those obtained after cooling down. That is in opposite to results that are observed for conventional concretes, where hot testedf cT values are usually higher than those observed after cooling down [8].…”

Section: Stress Strain Relationship Compressive Strength and Modulusmentioning

confidence: 92%

The impact of the amount of polypropylene fibres on spalling behaviour and residual mechanical properties of Reactive Powder Concretes

Hager

Zdeb

Krzemień

2013

MATEC Web of Conferences

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Abstract. In this paper, an experimental study on the spalling behaviour and mechanical properties of Reactive Powder Concretes (RPCs) in high temperature are presented. The research program was established to evaluate the impact of low melting temperature polypropylene fibres PP on mechanical properties evolution with temperature but also to verify the effectiveness of their addition to prevent spalling. Three sets of RPC specimens were prepared for this study with different amount of PP fibres (no fibres, 1.0 kg/m 3 and 2.0 kg/m 3 ). The addition of PP fibres reduces the initial compressive strength of the RPC material by approx. 14% no significant influence on modulus of elasticity was observed. Addition of 1 kg/m 3 of PP fibres in RPC, seem not to give a sufficient protection against occurrence of spalling phenomenon. By adding 2 kg/m 3 of PP fibres the risk of spalling is significantly reduced.

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Behavior of UHPFRC at High Temperatures

Cited by 15 publications

References 5 publications

Ultra-High Performance Concrete: Mechanical Performance, Durability, Sustainability and Implementation Challenges

Ultra-High Performance Concrete: Mechanical Performance, Durability, Sustainability and Implementation Challenges

Study of Toughness and Macro/Micro-Crack Development of Fibre-Reinforced Ultra-High Performance Concrete After Exposure to Elevated Temperature

The impact of the amount of polypropylene fibres on spalling behaviour and residual mechanical properties of Reactive Powder Concretes

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