Effects of Chloride Content on Thermal Properties of Concrete

Im, David

doi:10.21660/2018.41.icce8216

Cited by 4 publications

(4 citation statements)

References 9 publications

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“…The corrosion rate of reinforcing steel after 9 months of exposure was the highest. This phenomenon shows good agreement with the findings of previous researchers [8,9]. The effects of the aforementioned factors, including water to binder ratio, fly ash and chloride content, still could be seen with increasing exposure period.…”

Section: Corrosion Potentialsupporting

confidence: 92%

“…Along with the unexpected increase in chloride content, the variation of concrete compositions, such as water to binder ratio, fly ash content, etc., could affect the state of reinforcement corrosion. The severity of corrosion is normally evaluated based on electrochemical properties such as electrical resistivity of concrete, corrosion potential and corrosion rate of reinforcing steel [1][2][3][4][5][6][7][8][9]. Moreover, the other electrochemical properties such as Tafel slope and equilibrium potential, can be used to simulate both anodic and cathodic polarization in corrosion process.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Concrete Mix Proportion and Chloride Content on Electrochemical Properties of Reinforcing Steel in Concrete

Tran¹,

Sancharoen²,

Klomjit³

et al. 2020

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Corrosion of steel in concrete has been considered as a major cause reducing the lifespan of reinforced concrete (RC) structures. Evaluation of corrosion rate is crucial to determine service life and maintenance plaining for RC structures. Electrochemical properties of corrosion of embedded steel in concrete, including the Tafel slope, corrosion potential and corrosion current density, are significant parameters predicting corrosion rate. The objective of this paper was to quantitatively evaluate electrochemical properties of steel in different compositions of concrete. Varied parameters include the water to binder ratio of concrete, type of binder and chloride content. The electrochemical properties were evaluated at three periods of exposure. Experimental results reveal that the electrochemical properties of reinforcing steel depend on water to binder ratio, type of binder and chloride content. An increase in chloride content significantly decreases the corrosion potential and increases the corrosion rate of steel. The anodic equilibrium potential is lower with an increase in chloride content. The varied concrete mix proportion significantly influence the cathodic polarization. This is due to the effects of concrete porosity on oxygen concentration, which is influenced by the concrete mix proportions. The results can be used to predict corrosion rate of steel in various concrete mix proportion for determining service life and repairing of RC structures.

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Section: Corrosion Potentialsupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Effects of Concrete Mix Proportion and Chloride Content on Electrochemical Properties of Reinforcing Steel in Concrete

Tran¹,

Sancharoen²,

Klomjit³

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Similarly, chloride ions are also mentioned to migrate into pore solution above reinforcing steel. Furthermore, the previous research on effect of chloride content on thermal properties of concrete [24] proved that chloride in pores reduces specific heat of the concrete. Thus, from the different temperature history obtained from the experimental work, it can be said that the presence of chloride and corrosion product penetrated into the concrete pores changes thermal properties of concrete by decreasing specific heat and increasing thermal conductivity.…”

Section: Effect Of Corrosion Amountmentioning

confidence: 93%

Effect of Chloride and Corrosion of Reinforcing Steel on Thermal Behavior of Concrete and Its Modeling

Im¹,

Sancharoen²,

Julnipitawong³

et al. 2018

Self Cite

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Chloride induced corrosion of reinforcing steel is a significant problem. Thermograph is one of the Non-Destructive Testing methods which may be useful for detecting corroded bar in reinforced concrete. This study aims to investigate the thermal behavior of concrete influenced by chloride and corrosion of reinforcing steel. The results of this thermal behavior are useful for determining the detectability of corrosion by thermograph. Different mix proportions of concrete and level of corrosion were studied. The results of temperature profiles obtained from experimental work proved that when there is presence of dense rust confined between concrete and steel, thermal behavior of concrete around steel bar changed. When applying heat source on top surface of the specimen, there was a slight change of temperature on top of corroded bar while there was more signification change of temperature below it. This is because dense rust with low porosity is a better heat conductor when compared to concrete. The temperature history obtained from simulation and experiment are in a good agreement. Numerical simulation provides quite good results in the area closing to the concrete top surface (depth 0.5cm and 1.5cm) and the accuracy of the estimated temperature is within 2%-5% of the experimental results.

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“…It should be noted that coconut fibres have low thermal conductivity while being tough and stiff, and at the same time, increasing the tensile, flexural and compressive strengths of concrete [25]. According to statistics, fire outbreaks have been of high occurrence in our society, posing a lot of risk to human lives and properties at large [25][26][27]. Imhaz et al [28] evaluated the influence of fibre length on the polypropylene (PP) fibre reinforced cement concrete.…”

mentioning

confidence: 99%

Compressive Behaviour of Coconut Fibre (Cocos nucifera) Reinforced Concrete at Elevated Temperatures

Bamigboye

Ngene

Aladesuru

et al. 2020

Fibers

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Fire outbreaks in buildings have been a major concern in the world today. The integrity of concrete is usually questioned due to the fact that after these fire outbreaks the strength of the concrete is reduced considerably. Various methods have been adopted to improve the fire resistance property of concrete. This study focused on the use of coconut fibre to achieve this feat. In this study, varying percentages of treated and untreated coconut fibres were incorporated into concrete and the compressive strength was tested for both before heating and after heating. The percentages of replacement were 0.25, 0.5, 0.75 and 1% fibre content by weight of cement. Concrete cubes that had 0% fibre served as control specimens. After subjecting these concrete cubes to 250 °C and 150 °C for a period of 2 h, the compressive strength increased when compared to the control. The compressive strength increased up to 0.5% replacement by 3.88%. Beyond 0.5% fibre, the compressive strength reduced. Concrete having coconut fibre that had been treated with water also exhibited the highest compressive strength of 28.71 N/mm². It is concluded that coconut fibres are a great material in improving the strength of concrete, even after it was exposed to a certain degree of elevated temperature.

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Effects of Chloride Content on Thermal Properties of Concrete

Cited by 4 publications

References 9 publications

Effects of Concrete Mix Proportion and Chloride Content on Electrochemical Properties of Reinforcing Steel in Concrete

Effects of Concrete Mix Proportion and Chloride Content on Electrochemical Properties of Reinforcing Steel in Concrete

Effect of Chloride and Corrosion of Reinforcing Steel on Thermal Behavior of Concrete and Its Modeling

Compressive Behaviour of Coconut Fibre (Cocos nucifera) Reinforced Concrete at Elevated Temperatures

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