Behavior of the reinforced concrete at cryogenic temperatures

Dahmani, L.; Khenane, Amar; Kaci, Salah

doi:10.1016/j.cryogenics.2007.07.001

Cited by 109 publications

(31 citation statements)

References 10 publications

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“…After three cycles of -196 °C to 20 °C, the CS of C30 concrete decreased by 50%, while the MOE decreased by 90% (Yamane and Zhao 1980). Dahmani et al (2007), furthermore, discovered that the strength and hardness of the water-saturated concrete decreased after one cycle of -170 °C to 20 °C. The higher the water content of the concrete, the greater decrease in strength and hardness was observed.…”

Section: Residence To Low Temperatures Of Wood and Concretementioning

confidence: 99%

Effect of Low Temperature Cyclic Treatments on Modulus of Elasticity of Birch Wood

Zhao¹,

Lu²,

Zhou³

et al. 2015

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The modulus of elasticity (MOE) of birch (Betula platyphylla) wood specimens with four different moisture content (MC) levels, i.e., watersaturated, green, air-dried, and oven-dried, were examined under a low temperature condition ranging from -196 °C (liquid nitrogen temperature) to +20 °C (room temperature). Dynamic mechanical analysis (DMA) was used to evaluate the dynamic viscoelastic properties before and after the low temperature treatment, while X-ray diffraction (XRD) was used to analyze the crystal structure. The results showed that MOE with different MC increased after the low temperature treatment. Specimens with higher MCs were more affected by the treatment than specimens with lower MCs. However, the effect of low temperature treatment (within four times) on MOE was not significant (P = 0.053 -0.225). Cyclic treatments of liquid nitrogen did not decrease wood MOE. As a structural material, wood has a better residence to low temperatures compared to concrete, in which mechanical properties decreased dramatically after one cycle of low to room temperature.

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Section: Residence To Low Temperatures Of Wood and Concretementioning

confidence: 99%

Effect of Low Temperature Cyclic Treatments on Modulus of Elasticity of Birch Wood

Zhao¹,

Lu²,

Zhou³

et al. 2015

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“…The lightweight aggregate concrete has larger strain at cracking, and thus, can sustain more thermal deformation before cracking [4]. Conclusions.…”

Section: Physical Parameters Valuesmentioning

confidence: 98%

“…The risk could be prevented with the adoption of suitable measurements: -the insertion of the reinforcements in the tension zones to strengthen the concrete, thus reducing the formation of the cracks; -providing prestress to control cracks; -the use of a high performance concrete to increase resistance and to decrease the permeability [4];…”

Section: Physical Parameters Valuesmentioning

confidence: 99%

Thermomechanical response of LNG concrete tank to cryogenic temperatures

Dahmani

2011

Strength Mater

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Êëþ÷åâûå ñëîâà: òåðìîìåõàíè÷åñêèé ðàñ÷åò, ðåçåðâóàð äëÿ õðàíåíèÿ ñaeè-aeåííîãî ãàçà, êðèîãåííàÿ òåìïåðàòóðà, áåòîí.Introduction. This paper discusses the principal aspects of the numerical evaluation of thermal stress induced by LNG (liquefied natural gas) in the concrete tank.Since low temperature applications imply thermal stresses, temperature distribution data of thermal analysis is required in the coupled field analysis finally to obtain and analyze thermal stresses. It is, therefore, proposed to solve a heat conduction problem using finite element method to obtain temperature distribution data of a concrete tank at cryogenic temperatures.The basis for thermal analysis in ANSYS [1, 2] is a heat balance equation obtained from the principle of conservation of energy. The finite element solution performed via ANSYS yields nodal temperatures, and then uses the nodal temperatures to obtain other thermal quantities. The elastic stresses, induced by mechanical constraints and thermal strains resulting from the previous analysis, have been calculated.Finite Element Model. A solid concrete LNG tank model of 15 m radius and 30 m height shown in Fig. 1 is descretized with a 2D axisymetric finite element model [3] as shown in Fig. 2. Its mechanical properties are given in Table 1.

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“…The random occurrence of sudden extreme cold events also increases. 4,5 Some studies [6][7][8][9][10] explained the mechanical properties of ordinary concrete after the first freezing-thawing with a −170°C freezing environment temperature. In an environment temperature of 20−196°C, the compressive strength of ordinary concrete decreased more than 40% and the elastic modulus decreased more than 85% after three times freezing-thawing cycles.…”

Section: Introductionmentioning

confidence: 99%

Mechanical and frost resistance properties of high air content hydraulic concrete

Guoxing³

2015

Materials Research Innovations

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The frost resistance of hydraulic concrete is evaluated under −17°C freezing temperature according to the Chinese standards. However, the freezing-thawing condition is usually less than −17°C because of the broad distribution of water conservancy project in China. Therefore, the freezing-thawing cycle experiment of high frost resistance design level concrete with air content above 5·5% was conducted, and −17, −30 and −40°C freezing temperatures were adopted during the test. The mechanics and frost resistance properties of hydraulic concrete after freezing-thawing cycles were studied. Also, the microscopic characteristic of hydraulic concrete after freezing-thawing cycles was observed by using environmental scanning electron microscope. The test results indicated that the lower was the freezing temperature in the centre of concrete specimen, the greater was performance deterioration. The freezing-thawing cycles had significant impact on the microstructure of concrete. The number of internal micro fractures and the width of micro fractures increased after freezing-thawing cycles.

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Behavior of the reinforced concrete at cryogenic temperatures

Cited by 109 publications

References 10 publications

Effect of Low Temperature Cyclic Treatments on Modulus of Elasticity of Birch Wood

Effect of Low Temperature Cyclic Treatments on Modulus of Elasticity of Birch Wood

Thermomechanical response of LNG concrete tank to cryogenic temperatures

Mechanical and frost resistance properties of high air content hydraulic concrete

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