Contribution of cocktail of polypropylene and steel fibres in improving the behaviour of high strength concrete subjected to high temperature

Pliya, Prosper; Beaucour, Anne-Lise; Noumowé, Albert

doi:10.1016/j.conbuildmat.2010.11.064

Cited by 151 publications

(63 citation statements)

References 18 publications

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“…In addition, properties of polypropylene-fiber-reinforced concrete can be significantly improved. Polypropylene fibers in concrete can be used to reduce spalling and to enhance the residual strength of heated concretes 8 . Mixtures containing between 0.2 to 0.5 vol.% polypropylene fiber were generally characterized by an increase in compressive strength 9 , whereas with 0.5 vol.% fiber, the compressive strength of fibrous specimens at the age of 91 days increased by 15% compared with those of the reference sample.…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties of recycled PET fibers in concrete

et al. 2012

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Fiber-reinforced concrete represents the current tendency to apply more efficient crack-resistant concrete. For instance, polyethylene terephthalate (PET) is a polyester polymer obtained from recyclable bottles; it has been widely used to produce fibers to obtain cement-based products with improved properties. Therefore, this paper reports on an experimental study of recycled-bottle-PET fiber-reinforced concrete. Fibers with lengths of 10, 15 and 20 mm and volume fractions of 0.05, 0.18 and 0.30% related to the volume of the concrete were used. Physical and mechanical characterization of the concrete was performed, including the determination of compressive strength, flexural strength, Young's modulus and fracture toughness as well as analysis using mercury intrusion porosimetry (MIP) and scanning electron microscopy (SEM). Flexure and impact tests were performed after 28 and 150 days. No significant effect of the fiber addition on the compressive strength and modulus of elasticity was observed. However, the Young's modulus was observed to decrease as the fiber volume increased. At 28 days, the concrete flexural toughness and impact resistance increased with the presence of PET fibers, except for the 0.05 vol.% sample. However, at 150 days, this improvement was no longer present due to recycled-bottle-PET fiber degradation in the alkaline concrete environment, as visualized by SEM observations. An increase in porosity also has occurred at 365 days for the fiber-reinforced concrete, as determined by MIP.

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Section: Introductionmentioning

confidence: 99%

Mechanical properties of recycled PET fibers in concrete

et al. 2012

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“…The loss of weight in the temperature range from 300 °C to 600 °C was determined to change evenly, but it was greater in concretes with polypropylene fiber. Mechanical strength properties of concrete with polypropylene and metal fibers are worse than those of concrete with metal fiber, but better than concrete without fiber [17].…”

Section: The Impact Of Additives On the Mechanism Of Disintegratimentioning

confidence: 99%

“…The scientist [17] examined the impact of polypropylene and metal fibers in high-strength concretes at high temperatures. Portland cement CEM I with the strength class of 52.5 and the aggregate superplasticizer Cimfluid 2002, polypropylene and metal fibers were used in the tests.…”

Section: The Impact Of Additives On the Mechanism Of Disintegratimentioning

confidence: 99%

The Mechanism of Disintegration of Cement Concrete at High Temperatures

Jocius¹,

Skripkiūnas²

2016

Construction Science

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-Concrete is a composite material composed of a binder, aggregates, water and additives. Mixing of cement with water results in a number of chemical reactions known as cement hydration. Heating of concrete results in dehydration processes of cement minerals and new hydration products, which disintegrate the microstructure of concrete. This article reviews results of research conducted with Portland and alumina cement with conventional and refractory concrete aggregates. In civic buildings such common fillers as gravel, granite, dolomite or expanded clay are usually used. It is important to point out the differences between fillers because they constitute the majority of the concrete volume.

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“…In thermo-mechanical finite element software such as SAFIR ® , spalling cannot be predicted because the moisture flow and the development of pore pressures during heating are not captured. Meanwhile, extensive research efforts have been conducted on the measures to employ to prevent the apparition of spalling [5]. The Eurocode [4] gives different methods that should be provided in particular for high strength concrete.…”

Section: Methodsmentioning

confidence: 99%

Fire Performance of Columns Made of Normal and High Strength Concrete: A Comparative Analysis

Gernay

2016

KEM

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Abstract. The use of high strength concrete (HSC) in multi-story buildings has become increasingly popular. Selection of HSC over normal strength concrete (NSC) allows for reducing the dimensions of the columns sections. However, this reduction has consequences on the structural performance in case of fire, as smaller cross sections lead to faster temperature increase in the section core. Besides, HSC experiences higher rates of strength loss with temperature and a higher susceptibility to spalling than NSC. The fire performance of a column can thus be affected by selecting HSC over NSC. This research performs a comparison of the fire performance of HSC and NSC columns, based on numerical simulations by finite element method. The thermal and structural analyses of the columns are conducted with the software SAFIR ® . The variation of concrete strength with temperature for the different concrete classes is adopted from Eurocode. Different configurations are compared, including columns with the same load bearing capacity and columns with the same cross section. The relative loss of load bearing capacity during the fire is found to be more pronounced for HSC columns than for NSC columns. The impact on fire resistance rating is discussed. These results suggest that consideration of fire loading limits the opportunities for use of HSC, especially when the objective is to reduce the dimensions of the columns sections.

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Contribution of cocktail of polypropylene and steel fibres in improving the behaviour of high strength concrete subjected to high temperature

Cited by 151 publications

References 18 publications

Mechanical properties of recycled PET fibers in concrete

Mechanical properties of recycled PET fibers in concrete

The Mechanism of Disintegration of Cement Concrete at High Temperatures

Fire Performance of Columns Made of Normal and High Strength Concrete: A Comparative Analysis

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