Durability of High Performance Concrete (HPC) Subject to Fire Temperature Impact

Jackiewicz-Rek, W.; Drzymała, T.; Kuś, Artur; Tomaszewski, Mariusz

doi:10.1515/ace-2015-0109

Cited by 16 publications

(9 citation statements)

References 8 publications

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“…free thermal elongation of concrete [10], and contraction of compressed concrete caused by the reduction of its mechanical properties due to the influence of load and high temperature (the phenomenon known as load-induced thermal strain or transient creep [12][13][14][15][16][17]).…”

Section: Introductionmentioning

confidence: 99%

Thermal Bowing of Reinforced Concrete Elements Exposed to Non-Uniform Heating

Kowalski

Głowacki

Wróblewska

2018

Archives of Civil Engineering

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The paper presents the test description and results of thermal bowing of RC beams exposed to non-uniform heating at high temperature. Bending of a non-uniformly heated element is caused by free thermal elongation of the material it is made of. The higher the temperature gradient, the greater the bending. In the case when an element is exposed to load and high temperature simultaneously, apart from free bending also deformation of the RC element may occur, which is caused by the decrease of the concrete or reinforcing steel mechanical properties. In order to examine the contribution of the deflection caused by thermal bowing to the total deformation of the bent element with a heated tension zone, an experimental study of freely heated (unloaded) beams was performed. RC beams were heated: (1) on three sides of the cross-section or (2) only on the bottom side. Deflection of elements loaded by a substitute temperature gradient was calculated using the Maxwell–Mohr formula. The test results show that deflection of freely heated RC beams (caused by the thermal bowing phenomenon) can be 10 to 20% of the total deflection of loaded RC beams with a heated tension zone.

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Section: Introductionmentioning

confidence: 99%

Thermal Bowing of Reinforced Concrete Elements Exposed to Non-Uniform Heating

Kowalski

Głowacki

Wróblewska

2018

Archives of Civil Engineering

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“…In addition, reinforced concrete exhibits an increase in strength to a certain temperature of ca. 450 • C and decreases as the temperature is elevated beyond 600 • C [133]. There is a dearth of studies regarding the fire behaviour of concrete structures that have biochar.…”

Section: Fire Propertiesmentioning

confidence: 99%

Biochar-Added Cementitious Materials—A Review on Mechanical, Thermal, and Environmental Properties

Mensah

Vigneshwaran

Narayanan³

et al. 2021

Sustainability

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The enhanced carbon footprint of the construction sector has created the need for CO2 emission control and mitigation. CO2 emissions in the construction sector are influenced by a variety of factors, including raw material preparation, cement production, and, most notably, the construction process. Thus, using biobased constituents in cement could reduce CO2 emissions. However, biobased constituents can degrade and have a negative impact on cement performance. Recently, carbonised biomass known as biochar has been found to be an effective partial replacement for cement. Various studies have reported improved mechanical strength and thermal properties with the inclusion of biochar in concrete. To comprehend the properties of biochar-added cementitious materials, the properties of biochar and their effect on concrete need to be examined. This review provides a critical examination of the mechanical and thermal properties of biochar and biochar-added cementitious materials. The study also covers biochar’s life cycle assessment and economic benefits. Overall, the purpose of this review article is to provide a means for researchers in the relevant field to gain a deeper understanding of the innate properties of biochar imparted into biochar-added cementitious materials for property enhancement and reduction of CO2 emissions.

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“…Moreover, improved fracture toughness, impact resistance, ductility, tensile and bending capacity are leading to an increase in applications of polypropylene FRC [7,16,17]. Polypropylene fibres also increase thermal stability and improve the properties of concrete samples exposed to elevated temperatures [18][19][20]. Fibres are divided into two categories by their size, specifically, micro and macro fibres.…”

Section: Introductionmentioning

confidence: 99%

Axial Stress-Strain Performance of Recycled Aggregate Concrete Reinforced with Macro-Polypropylene Fibres

Munir

Kazmi

et al. 2021

Sustainability

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The addition of macro-polypropylene fibres improves the stress-strain performance of natural aggregate concrete (NAC). However, limited studies focus on the stress-strain performance of macro-polypropylene fibre-reinforced recycled aggregate concrete (RAC). Considering the variability of coarse recycled aggregates (CRA), more studies are needed to investigate the stress-strain performance of macro-polypropylene fibre-reinforced RAC. In this study, a new type of 48 mm long BarChip macro-polypropylene fibre with a continuously embossed surface texture is used to produce BarChip fibre-reinforced NAC (BFNAC) and RAC (BFRAC). The stress-strain performance of BFNAC and BFRAC is studied for varying dosages of BarChip fibres. Results show that the increase in energy dissipation capacity (i.e., area under the curve), peak stress, and peak strain of samples is observed with an increase in fibre dosage, indicating the positive effect of fibre addition on the stress-strain performance of concrete. The strength enhancement due to the addition of fibres is higher for BFRAC samples than BFNAC samples. The reduction in peak stress, ultimate strain, toughness and specific toughness of concrete samples due to the utilisation of CRA also reduces with the addition of fibres. Hence, the negative effect of CRA on the properties of concrete samples can be minimised by adding BarChip macro-polypropylene fibres. The applicability of the stress-strain model previously developed for macro-synthetic and steel fibre-reinforced NAC and RAC to BFNAC and BFRAC is also examined.

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Durability of High Performance Concrete (HPC) Subject to Fire Temperature Impact

Cited by 16 publications

References 8 publications

Thermal Bowing of Reinforced Concrete Elements Exposed to Non-Uniform Heating

Thermal Bowing of Reinforced Concrete Elements Exposed to Non-Uniform Heating

Biochar-Added Cementitious Materials—A Review on Mechanical, Thermal, and Environmental Properties

Axial Stress-Strain Performance of Recycled Aggregate Concrete Reinforced with Macro-Polypropylene Fibres

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