Mechanical properties of fibre reinforced reactive powder concrete after exposure to high temperatures

Sanchayan, Sriskandarajah; Gowripalan, N; Foster, SJ

doi:10.1201/b15320-209

Cited by 3 publications

(2 citation statements)

References 1 publication

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“…An electric muffle furnace was used to heat 20 saturated specimens of each mixture [ 36 ]. Heating–cooling cycles consisted of three phases: temperature rise at 5 °C/min [ 30 , 57 , 58 , 59 , 60 ], temperature dwell corresponding to two hours at 600 °C to achieve thermal steady-state [ 61 ] and slow cooling to room temperature at about 0.5 °C/min to avoid thermal shock ( Figure 2 ). Saturated specimens were used to minimize possible effects of the moisture content on the heat and mass transfer properties of concrete, especially in the initial state [ 33 ].…”

Section: Experimental Programmentioning

confidence: 99%

Effects of Plastic Waste on the Heat-Induced Spalling Performance and Mechanical Properties of High Strength Concrete

et al. 2020

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This paper investigates a potential application of hard-to-recycle plastic waste as polymeric addition in high strength concrete, with a focus on the potential to mitigate heat-induced concrete spalling and the consequent effects on the mechanical properties. The waste corresponds to soft and hard plastic, including household polymers vastly disposed of in landfills, although technically recyclable. Mechanical and physical properties, cracking, mass loss, and the occurrence of spalling were assessed in high strength concrete samples produced with either plastic waste or polypropylene fibers after 2-h exposure to 600 °C. The analysis was supported by Scanning Electron Microscopy and X-Ray Computed Tomography images. The plastic waste is composed of different polymers with a thermal degradation between 250 to 500 °C. Polypropylene (PP) fibers and plastic waste dispersed in concrete have proved to play an essential role in mitigating heat-induced concrete spalling, contributing to the release of internal pressure after the polymer melting. The different morphology of plastic waste and polypropylene fibers leads to distinct mechanisms of action. While the vapor pressure dissipation network originated by polypropylene fibers is related to the formation of continuous channels, the plastic waste seems to cause discontinuous reservoirs and fewer damages into the concrete matrix. The incorporation of plastic waste improved heat-induced concrete spalling performance. While 6 kg/m3 of plastic increased the mechanical performance after exposure to high temperature, the incorporation of 3 kg/m3 resulted in mechanical properties comparable to the reference concrete.

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Section: Experimental Programmentioning

confidence: 99%

Effects of Plastic Waste on the Heat-Induced Spalling Performance and Mechanical Properties of High Strength Concrete

et al. 2020

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“…Plain RPC specimens spalled when the temperature was between 260 ºC and 520 ºC [3], but PP fiber significantly improved the resistance to explosive spalling of RPC [4]. Sanchayan [5] also revealed that RPC is highly prone to explosive spalling when the temperature is higher than 400 ºC, and PP fibers alleviate the explosive spalling. Liu [6] also reported that RPC specimens spalled at a furnace temperature of 400 ºC, and the maximum vapor pressure inside the concrete specimens reached 3.4 MPa.…”

Section: Introductionmentioning

confidence: 99%

Explosive spalling behavior of reactive powder concrete exposed to high temperature

Peng¹,

Shui²

2018

Proceedings of the 2018 7th International Conference on Energy and Environmental Protection (ICEEP 2018)

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Explosive spalling behavior of reactive powder concrete (RPC) exposed to high temperature up to 800 ºC and the influence of steel fiber and polypropylene (PP) fiber on it were investigated in this experiment. Results show that RPC specimens encountered severe explosive spalling. However, adding PP fiber can alleviate the explosive spalling of RPC significantly and prevents some specimens from explosive spalling. In addition, the explosive spalling of RPC specimens with the higher moisture content was severe than that of specimens with the lower moisture content. Experiment Details Preparation of RPC specimens. Portland cement with the 52.5R strength grade and three kinds of admixtures, including silica fume (SF), fly ash (FA) and ground granulated blast furnace slag (GGBS) were used as binding materials. Artificial sand was used as fine aggregate. The steel fiber used in the specimens is flat-straight copper-coated steel fiber with a length of 16 mm and a diameter of 0.20 mm, and its tensile strength is 2200 MPa. Polypropylene (PP) fiber has a length of 19 mm and a diameter of 0.15 mm. Super plasticizer (50% solid content) was used. Two types of RPC were prepared and designated by RPC, RPC-HF, respectively. Their mixture proportions and 56-day compressive strengths are shown in Table 1. All dry materials were added in sequentially and mixed. After all the materials were mixed uniformly, water and water reducing agent

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Behaviour of hybrid PVA-steel fibre reinforced ultra high performance concrete at high temperature

Foster¹

2013

Research and Applications in Structural Engineering, Mechanics and Computation

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Mechanical properties of fibre reinforced reactive powder concrete after exposure to high temperatures

Cited by 3 publications

References 1 publication

Effects of Plastic Waste on the Heat-Induced Spalling Performance and Mechanical Properties of High Strength Concrete

Effects of Plastic Waste on the Heat-Induced Spalling Performance and Mechanical Properties of High Strength Concrete

Explosive spalling behavior of reactive powder concrete exposed to high temperature

Behaviour of hybrid PVA-steel fibre reinforced ultra high performance concrete at high temperature

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