Estimation of chloride diffusion coefficients of high-strength concrete with synthetic fibres after fire exposure

Ozawa, Mitsuo; Sakoi, Yuki; Fujimoto, Kentaro; Tetsura, Kenta; Parajuli, Sirjana Subedi

doi:10.1016/j.conbuildmat.2017.03.117

Cited by 20 publications

(6 citation statements)

References 20 publications

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“…Usually, the structural elements of normal-strength concrete show considerable performance under exposure to fire. However, a distinct difference is reported in the literature between HSC and normal-strength concrete after exposure to fire (Bilodeau et al, 2004;Laneyrie et al, 2016;Ozawa et al, 2017;Cao et al, 2018). Moreover, the explosive spalling that occurs in HSC under exposure to rapid fire is also of significant concern (Alfahdawi et al, 2019;Xiong and Liew, 2020;Afzal and Khushnood, 2021;Li et al, 2021;Khan et al, 2022c).…”

Section: Introductionmentioning

confidence: 99%

Machine learning-based evaluation of parameters of high-strength concrete and raw material interaction at elevated temperatures

Chen¹,

Suhail

Bahrami

et al. 2023

Front. Mater.

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High-strength concrete (HSC) is vulnerable to strength loss when exposed to high temperatures or fire, risking the structural integrity of buildings and critical infrastructures. Predicting the compressive strength of HSC under high-temperature conditions is crucial for safety. Machine learning (ML) techniques have emerged as a powerful tool for predicting concrete properties. Accurate prediction of the compressive strength of HSC is important as HSC can experience strength losses of up to 80% after exposure to temperatures of 800°C–1000°C. This study evaluates the efficacy of ML techniques such as Extreme Gradient Boosting, Random Forest (RF), and Adaptive Boosting for predicting the compressive strength of HSC. The results of this study demonstrate that the RF model is the most efficient for predicting the compressive strength of HSC, exhibiting the R2 value of 0.98 and lower mean absolute error and root mean square error values than the other applied models. Furthermore, Shapley Additive Explanations analysis highlights temperature as the most significant factor influencing the compressive strength of HSC. This article provides valuable insights into the timely and effective determination of the compressive strength of HSC under high-temperature conditions, benefiting both the construction industry and academia. By leveraging ML techniques and considering the critical factors that influence the compressive strength of HSC, it is possible to optimize the design and construction process of HSC and enhance its resilience to high-temperature exposure.

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Section: Introductionmentioning

confidence: 99%

Machine learning-based evaluation of parameters of high-strength concrete and raw material interaction at elevated temperatures

Chen¹,

Suhail

Bahrami

et al. 2023

Front. Mater.

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“…Gupta et al 1 prepared concrete by replacing the fine aggregate with waste rubber fiber, and studied changes in water permeability and chloride ion permeability after elevated temperature by considering six temperatures and three heating times. Ozawa et al 2 used tracers to estimate the chloride diffusion coefficient of concrete after the fire and concluded that the apparent chloride diffusion coefficient of concrete increased with an increase in heating temperature, and that thermal damage reduced Discussion on this paper must be submitted within two months of the print publication. The discussion will then be published in print, along with the authors' closure, if any, approximately nine months after the print publication.…”

Section: Introductionmentioning

confidence: 99%

“…Gupta et al 1 prepared concrete by replacing the fine aggregate with waste rubber fiber, and studied changes in water permeability and chloride ion permeability after elevated temperature by considering six temperatures and three heating times. Ozawa et al 2 used tracers to estimate the chloride diffusion coefficient of concrete after the fire and concluded that the apparent chloride diffusion coefficient of concrete increased with an increase in heating temperature, and that thermal damage reduced the penetration resistance and durability of concrete. Nadeem et al 3 measured the chloride ion permeability and water adsorption of fly ash and metakaolin concrete at four temperatures in the range 200 ~ 800°C, and it is proposed that 400°C can be regarded as the critical temperature for performance change of concrete.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on durability of basalt fiber concrete after elevated temperature

Han

et al. 2021

Structural Concrete

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The durability of concrete material after exposure to elevated temperatures is important 17 for the serviceability prediction of concrete structures in a fire disaster scenario. Existing 18 researches show that an appropriate amount of basalt fiber can significantly improve the 19 splitting tensile strength and chloride penetration resistance of concrete. However, the 20 mechanical properties of basalt fiber concrete after elevated temperatures and its 21 durability properties are still not clear. In this paper, the mechanical properties, 22 carbonization law and chloride ion penetration law of ordinary concrete and basalt fiber 23 concrete under high temperatures are studied. The concept of a burnt layer for concrete 24 exposed to elevated temperatures is proposed, and the thickness of this burnt layer for 25 concrete under different temperatures were measured. The results show that the addition 26 of basalt fiber can inhibit the carbonization of concrete at elevated temperatures, 27 diminish the thickness of the burnt layer, and significantly improve the chloride 28 penetration resistance of concrete.

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“…Galle et al [2] reviewed the effect of heating on compressive strength, splitting tensile strength, and elastic modulus of concrete exposed high temperatures. Ozawaet al [3] used tracers to estimate the chloride diffusion coefficient of concrete following exposure to fire. Several scholars [4 -9] have investigated the effect of different cooling methods on the physical and mechanical properties of concrete.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of the mechanical properties of basalt fibre-reinforced concrete at elevated temperatures

Han

Qin

et al. 2021

European Journal of Environmental and Civil Engineering

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In this study, changes to the macroscopic properties and microstructure of basalt fiber reinforced concrete exposed to high temperature were tested. Central temperature, mass loss, mechanical properties, and the synergistic mechanism of basalt fiber and concrete matrix under different temperatures were analyzed. The results show that basalt fiber reinforced concrete provides excellent thermal insulation and can, to some extent, mitigate the blowup phenomenon.Adding basalt fiber effectively improves the mechanical properties of concrete exposed high temperatures. However, the synergetic effects of basalt fiber and concrete matrix vary with temperature.

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Estimation of chloride diffusion coefficients of high-strength concrete with synthetic fibres after fire exposure

Cited by 20 publications

References 20 publications

Machine learning-based evaluation of parameters of high-strength concrete and raw material interaction at elevated temperatures

Machine learning-based evaluation of parameters of high-strength concrete and raw material interaction at elevated temperatures

Experimental study on durability of basalt fiber concrete after elevated temperature

Experimental study of the mechanical properties of basalt fibre-reinforced concrete at elevated temperatures

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