Physical-mechanical behavior of concretes exposed to high temperatures and different cooling systems

Ercolani, Germán Darío; Ortega, Néstor F.; Priano, Carla; Señas, Lilia

doi:10.1002/suco.201500202

Cited by 12 publications

(13 citation statements)

References 10 publications

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“…In the past decades, researchers have focused on the mechanical properties of concrete after exposure to elevated temperatures, such as compressive strength, splitting tensile strength and elastic modulus. Results have indicated that the degree of deterioration depends on the peak temperature, exposure time, cooling system and concrete composition [8,9,14,15]. Omer Arioz et al [1] carried out experimental tests to investigate concrete after exposure to elevated temperatures from 200 °C to 1200 °C.…”

Section: Introductionmentioning

confidence: 99%

“…The specimens completely decomposed and lost their binding properties after exposure at 1200 °C. Germán Ercolani et al [14] explored the effects of elevated temperatures and different cooling systems on the mechanical properties of concrete. The test results revealed that the water cooling method caused serious decrease of compressive strength, while the increase of water volume used for cooling aggravated this trend.…”

Section: Introductionmentioning

confidence: 99%

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A DIC-Based Study on Compressive Responses of Concrete after Exposure to Elevated Temperatures

et al. 2019

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This paper provides an experimental investigation on the cracking process and residual mechanical properties of concrete after exposure to elevated temperatures. A total of 36 standard concrete prism specimens were tested after exposure to high temperatures of up to 600 °C. The failure modes, cracking process, residual mechanical properties, deformation characteristics and the strain distribution on the surface during the loading procedure were presented. The influences of exposure temperature and water–cement ratio (w/c) were interpreted. The digital image correlation (DIC) method was applied to quantitatively and visually characterize the development of cracking and relative displacement on the concrete surface. The findings suggest that the residual compressive strength and elastic modulus of the concrete decreases gradually with the increasing temperature, especially in the specimens with lower w/c ratio. The DIC technique provides an effective means to measure very precise and detailed information, including the crack opening and distribution of strain on the concrete surface.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A DIC-Based Study on Compressive Responses of Concrete after Exposure to Elevated Temperatures

et al. 2019

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“…Many methods have been proposed to measure the concrete degradation depth caused by fire (Kobayashi and Edahiro 2008;fib 2008). These methods can be roughly categorized into four types: (i) estimating the maximum exposed temperature from the color change on the concrete surface (Joongwon et al 2009;Nabi et al 2004;Sheng et al 2018), (ii) estimating the altered calcium hydroxide [Ca(OH) 2 ] depth using chemical methods such as neutralization depth measurement, scanning electron microscopy, differential thermogravimetric analysis, and X-ray diffraction (Heap et al 2013;Lin et al 1996;Pattamad and Danupon 2018), (iii) measuring the strength and hardness of the concrete via the compressive strength, Vickers hardness, and rebound number measured with a Schmidt hammer (Kubilay 2013;Muhammad and Raja 2013;Pattamad and Danupon 2018;Haddad et al 2013;Cao 2017) and (iv) estimating the degraded depth from crack generation using the ultrasonic propagation velocity and impact echo (Chhauda 1976;Ercolani et al 2017;Kubilay 2013;Heap et al 2013;Iwano et al 2017;Ufuk and Michael 2007).…”

Section: Introductionmentioning

confidence: 99%

A Simple Method to Evaluate the Depth of Concrete Degradation by Fire

Kubo

Hirata

Yashiro

et al. 2019

ACT

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A method was developed to estimate the depth of concrete degradation caused by a fire using the rebound number measured with a compact Equotip hardness tester. The method was experimentally verified by measuring a core taken from a concrete specimen heated according to the RABT curve to confirm the distribution of the rebound number from the heating surface. The results were then compared with the distribution of the residual compressive strength estimated from the heated temperature of the concrete specimen and further measured with a core taken from the specimen. This confirmed that the distribution of the damage depth of concrete can be simply estimated by measuring the rebound number of test pieces obtained by cutting a core sample in half. The distribution of the damage depth coincides with the distribution of the measured compressive strength and the residual compressive strength estimated from the temperature data obtained in the fire resistance test.

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“…[7][8][9] Capillary pores in cement paste provide spaces for water penetration: this increases transport properties. [10][11][12] Water penetration under thawing conditions leads to ice formation in pores at freezing point temperature. 13,14 This causes increase in volume, which in turn enhance pressure on pore interior walls.…”

Section: Introductionmentioning

confidence: 99%

“…Specifically, cement type as an effective factor on cement paste formation considerably influences the damage of concrete and mortar . Capillary pores in cement paste provide spaces for water penetration: this increases transport properties . Water penetration under thawing conditions leads to ice formation in pores at freezing point temperature .…”

Section: Introductionmentioning

confidence: 99%

Genetic prediction of cement mortar mechanical properties with different cement strength class after freezing and thawing cycles

Ghaemi‐Fard

Eskandari‐Naddaf

Ebrahimi

2018

Structural Concrete

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This study predicts the mechanical properties of cement mortars. It focuses specifically on cement strength classes of 32.5, 42.5, and 52.5 MPa, respectively. To this end, a total of 270 specimens using 54 mix designs were constructed and subjected to freezing and thawing cycles (FTCs) at −18 and 18 °C. Then, mechanical properties such as compressive and flexural strength and porosity of the specimens after 0, 50, 100, 150, and 200 cycles were obtained. Afterward, genetic expression programming (GEP) was used to predict the obtained results and to represent nonlinear relationships between the mechanical properties, freezing and thawing cycle, and cement strength class. The experimental data was used for training and testing of two GEP approach models. The results show that the strength of mortar reduces with increase in FTC. On other hand, a close correlation was observed between the predicted and experimental values when cement strength class and number of cycle were considered as independent input parameters. This fact indicates the significance of the aforementioned parameters along with the other parameters such as water to cement ratio, sand to cement ratio, and weight of cement on the accuracy of the prediction.

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Physical-mechanical behavior of concretes exposed to high temperatures and different cooling systems

Cited by 12 publications

References 10 publications

A DIC-Based Study on Compressive Responses of Concrete after Exposure to Elevated Temperatures

A DIC-Based Study on Compressive Responses of Concrete after Exposure to Elevated Temperatures

A Simple Method to Evaluate the Depth of Concrete Degradation by Fire

Genetic prediction of cement mortar mechanical properties with different cement strength class after freezing and thawing cycles

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