Concrete Structures Subject to High Temperature

2009 ◽  
pp. 63-91 ◽  
Author(s):  
C.E. Majorana ◽  
D. Gawin ◽  
F. Pesavento ◽  
B.A. Schrefler
Keyword(s):  
High Temperature ◽  
Concrete Structures

Mineral-impregnated carbon fibre reinforcement for high temperature resistance of thin-walled concrete structures

2019 ◽  
Vol 97 ◽  
pp. 68-77 ◽  
Author(s):  
Kai Schneider ◽  
Albert Michel ◽  
Marco Liebscher ◽  
Lucas Terreri ◽  
Simone Hempel ◽  
...  
Keyword(s):  
High Temperature ◽  
Carbon Fibre ◽  
Concrete Structures ◽  
Fibre Reinforcement ◽  
Temperature Resistance ◽  
High Temperature Resistance ◽  
Thin Walled

Modeling of Vapor Pressure Build-Up in Heated High-Performance Concrete

2012 ◽  
Vol 204-208 ◽  
pp. 3691-3694
Author(s):  
Jie Zhao ◽  
Jian Jun Zheng ◽  
Gai Fei Peng
Keyword(s):  
High Temperature ◽  
Vapor Pressure ◽  
Prediction Model ◽  
High Performance ◽  
High Performance Concrete ◽  
Dominant Role ◽  
Concrete Structures ◽  
Mechanism Study ◽  
Material Degradation ◽  
Temperature Conditions

Under high temperature conditions, such as fire, high-performance concrete will undergo material degradation or even spalling. Spalling is the most detrimental to concrete structures. To prevent concrete from spalling, the mechanism should be understood. Since the build-up vapor pressure in concrete is supposed to play a dominant role in spalling, a vapor pressure prediction model is proposed in this paper to quantitatively analyze the vapor pressure, which can be used for the spalling mechanism study.

Advanced Numerical Study of Composite Steel‐Concrete Structures at High Temperature

ce/papers ◽  
2021 ◽  
Vol 4 (2-4) ◽  
pp. 1421-1428
Author(s):  
Rafael C. Barros ◽  
Ricardo A.M. Silveira ◽  
Dalilah Pires ◽  
Ígor J.M. Lemes
Keyword(s):  
High Temperature ◽  
Numerical Study ◽  
Concrete Structures ◽  
Composite Steel

scholarly journals The Coupled Effect of Temperature and Carbonation on the Corrosion of Rebars in the Simulated Concrete Pore Solutions

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Jiezhen Hu ◽  
Xuequn Cheng ◽  
Xiaogang Li ◽  
Peichang Deng ◽  
Gui Wang
Keyword(s):  
High Temperature ◽  
Electrochemical Impedance ◽  
Ph Value ◽  
Concrete Structures ◽  
Open Circuit ◽  
Effect Of Temperature ◽  
Coupled Effect ◽  
Latitude Region ◽  
Higher Temperature ◽  
Lower Temperature

The reinforced concrete structures have to survive high temperature and carbonation at low latitude region. The research on the effect of temperature and the effect of carbonation are vital to the corrosion of the rebars in concrete structures. The coupled effect of temperature and carbonation on the corrosion of rebars was researched by using the open circuit potential (OCP), the electrochemical impedance spectroscopy (EIS), and the potentiodynamic polarization (PP) measurement in the simulated concrete pore solutions (SPSs). The high temperature environment is conducive to the formation of passivated surface of rebars in SPSs, but the dissolution velocity of passivated surface is higher. The rebars have the greater capacity of passivity at lower temperature. The corrosion rate of rebars at higher temperature is smaller in moderate pH value (10.6) SPSs. The rebars suffer from serious corrosion in the pH = 9.6 SPSs at 318 K temperature.

Degradation of Reinforced Concrete Structures of Aluminum Electrolysis Plants Subjected to Elevated Temperature and Cyclic Load

2016 ◽  
Vol 711 ◽  
pp. 533-540
Author(s):  
Hideo Kasami ◽  
Takafumi Tayama
Keyword(s):  
High Temperature ◽  
Elevated Temperature ◽  
Cyclic Load ◽  
Concrete Structures ◽  
Aluminum Electrolysis ◽  
Shear Cracks ◽  
Heavy Vehicles ◽  
Stray Current ◽  
Electrolysis Cells

Technical papers describing the temperature related degradation of concrete are abundant, and serious damages often occurred in concrete structures subjected to high temperature such as metallurgy factories, although such occurrences were seldom made public. Concrete structures in aluminum electrolysis plants are generally subjected to high temperature emitted from electrolysis cells and cyclic load of heavy vehicles. Besides, hydrogen fluoride emitted from cells and stray current through reinforcement may cause deteriorating effects. In the case of an electrolysis plant built in Niigata in late 1960's, a part of passageway slab collapsed within a year of operation. A few years later, mesh shaped cracks on operation floor and shear cracks on floor beams and columns were observed. And an overall investigation on floor beams of 4 smelter buildings was carried out to determine the extent of deterioration, in 1972. The residual strength decreased linearly with operation term. The extent of strength reduction in "t" years' operation that we named "Deterioration Factor" and limit of lifetime were estimated. Countermeasures to reduce cyclic load and to reinforce floor beams were then taken, as well as the application of the Deterioration Factor to the next electrolysis plant in Shikoku Island. Details of renewed design of S-Electrolysis Plant and degradation of concrete are discussed. These aluminum electrolysis plants in Niigata and Shikoku have stopped operation in 1985 due to the withdrawal of the refining company, and existing smelter buildings have been diverted to another use. Although this paper presents rather retrospective cases, the authors wish this would be still helpful as a case study on degradation in concrete structure due to elevated temperature.

Fire Resistance of Non-Crack Resistant Flexural Reinforced Concrete Elements

2015 ◽  
Vol 725-726 ◽  
pp. 15-20
Author(s):  
Vyacheslav Belov ◽  
Valery Morozov
Keyword(s):  
Reinforced Concrete ◽  
High Temperature ◽  
Fire Resistance ◽  
Concrete Structures ◽  
National Income ◽  
Developed Countries ◽  
Reinforced Concrete Structures ◽  
Reinforced Concrete Structure ◽  
Actual Problem ◽  
Concrete Elements

In developed countries only loss of property because of fire makes annually up to 2% of their national income [9, 15]. The bearing capacity of reinforced concrete structures at high temperature impact is lost within several dozens of minutes [1, 3, 5, 10, 12, 18, 25]. Disappointing statistics of increase of both the number of fires and the scope of damage due to them aggravates the actual problem of determination of reinforced concrete structures fire-endurance. The main problems and methods of evaluation of reinforced concrete structure fire resistance are stated. Within the framework of block approach to evaluation of strain of flexural reinforced concrete elements with cracks, design model of reinforced concrete thermo-force resistance is made. Extended nomenclature of influences of high temperature at fire on decrease of performance of bearing reinforced concrete structures is considered. Empirical dependencies of strength and strain characteristics of concrete and reinforcement on high temperatures are used. Proposals on specification of evaluation of fire resistance of statically indeterminate reinforced concrete structures are formulated.

Fire Spalling Modeling of High Performance Concrete

2011 ◽  
Vol 52-54 ◽  
pp. 378-383 ◽  
Author(s):  
Jie Zhao ◽  
Jian Jun Zheng ◽  
Gai Fei Peng
Keyword(s):  
Thermal Stress ◽  
High Temperature ◽  
Vapor Pressure ◽  
High Performance ◽  
High Performance Concrete ◽  
Damage Model ◽  
Concrete Structures ◽  
Anisotropic Damage ◽  
Material Degradation ◽  
Moisture Contents

Under high temperature conditions, such as fire, high performance concrete will undergo material degradation or even spalling. Spalling is the most detrimental damage to concrete structures. To prevent concrete from spalling, the mechanism should be understood. In this paper, an anisotropic damage model, in which both the thermal stress and vapor pressure are incorporated, is presented to analyze the spalling mechanism. The spalling phenomenon is studied based on two cases of different moisture contents. It is concluded that when the vapor pressure is present, concrete will behave much more brittlely.

Studies on Effect of Refractory Chemicals on Cement Mortar

2011 ◽  
Vol 82 ◽  
pp. 184-189
Author(s):  
Narayana Suresh ◽  
Ramaswamy Jeyalakshmi ◽  
Uma Suresh
Keyword(s):  
High Temperature ◽  
Calcium Hydroxide ◽  
Fire Resistance ◽  
Cement Mortar ◽  
Concrete Structures ◽  
Previous Experience ◽  
Hydration Products ◽  
High Temperature Properties ◽  
Concrete Admixtures ◽  
Physical Changes

Concrete has remarkable fire resistance properties. In the case of fire, it is found that the concrete affected by fire depends to a great extent on the intensity and duration of fire. Previous experience has shown that concrete structures are likely to have a good fire rating than structures made of other materials. Nevertheless, concrete undergoes important chemical and physical changes, starting at 400°C - 500°C. As calcium hydroxide and other hydration products start to decompose, concrete tends to lose its strength, typically around 600°C - 700°C. In order to improve the high temperature properties of concrete, admixtures can be used in concrete. In the following, a study on the effects of different admixtures on the properties of concrete at high temperature is presented.

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