Numerical analysis of heating rate effect on spalling of high-performance concrete under high temperature conditions

Zhao, Jie; Zheng, Jianjun; Peng, Gai Fei; Breugel, K. van

doi:10.1016/j.conbuildmat.2017.07.023

Cited by 40 publications

(13 citation statements)

References 33 publications

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“…Similar conclusions have been illustrated by other studies [3,9]. Further, a large number of researchers indicated that the heating temperature [3,9,10], heating rate [11] and cooling regimes [12,13] all have a significant influence on the microstructure and performance of concrete.…”

Section: Introductionsupporting

confidence: 85%

Effects of Combined Usage of Supplementary Cementitious Materials on the Thermal Properties and Microstructure of High-Performance Concrete at High Temperatures

Tang

Zhang

et al. 2020

Materials

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Concrete has low porosity and compact microstructure, and thus can be vulnerable to high temperature, and the increasing application of various types of supplementary cementitious materials (SCMs) in concrete makes its high-temperature resistant behavior more complex. In this study, we investigate the effects of four formulations with typical SCMs combinations of fly ash (FA), ultra-fine fly ash (UFFA) and metakaolin (MK), and study the effects of SCMs combinations on the thermal performance, microstructure, and the crystalline and amorphous phases evolution of concrete subjected to high temperatures. The experimental results showed that at 400 °C, with the addition of 20% FA (wt %), the thermal conductivity of the sample slightly increased to 1.5 W/(m·K). Replacing FA with UFFA can further increase the thermal conductivity to 1.7 W/(m·K). Thermal conductivity of concrete slightly increased at 400 °C and significantly reduced at 800 °C. Further, combined usage of SCMs delayed and reduced micro-cracks of concrete subjected to high temperatures. This study demonstrates the potential of combining the usage of SCMs to promote the high-temperature performance of concrete and explains the micro-mechanism of concrete containing SCMs at high temperatures.

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Section: Introductionsupporting

confidence: 85%

Effects of Combined Usage of Supplementary Cementitious Materials on the Thermal Properties and Microstructure of High-Performance Concrete at High Temperatures

Tang

Zhang

et al. 2020

Materials

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“…As basalt fibre plays a dominant role at 300 ºC and 800 ºC, PP fibre governs the flexural strength at 600 ºC where the elastic strain energy reaches maximum value due to the vapour pressure [25]. This is due to the same behaviour of PP fibre under high temperature as explained in Section 3.1.…”

Section: Flexural Strengthmentioning

confidence: 66%

Basalt powder dependent properties of mortars subjected to high temperatures

2019

JCE

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Basalt powder dependent properties of mortars subjected to high temperaturesThe effects of high temperatures of up to 800°C on residual physical and mechanical properties of mortars are presented in this paper. Due to its resistance to high temperatures, basalt powder is used as a substitute to standard sand at the ratios of 20% and 40%. Polypropylene or basalt fibres have been added to mortar mixtures to avoid spalling. Results show that the ratio of basalt powder does not change the strength reduction rate, and that the flexural strength performance of mortar mainly depends on fibre type and temperature rather than on basalt powder substitution.

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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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Numerical analysis of heating rate effect on spalling of high-performance concrete under high temperature conditions

Cited by 40 publications

References 33 publications

Effects of Combined Usage of Supplementary Cementitious Materials on the Thermal Properties and Microstructure of High-Performance Concrete at High Temperatures

Effects of Combined Usage of Supplementary Cementitious Materials on the Thermal Properties and Microstructure of High-Performance Concrete at High Temperatures

Basalt powder dependent properties of mortars subjected to high temperatures

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

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