Effect of temperature on steel and concrete for PCRV's

Schneider, Ulrich; Diederichs, Ulrich; Ehm, C.

doi:10.1016/0029-5493(82)90144-3

Cited by 68 publications

(56 citation statements)

References 4 publications

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“…Thermal conductivity increases with temperature below 100°C; however, it gradually decreases with temperature over 100°C. This trend corresponds to previous research studies (Blundell et al 1976;Schneider et al 1981). The thermal conductivity of uniform materials, such as ceramics or water generally increase with the increase of temperature, so the results below 100°C are corresponding to them; however, the results above 100°C show the opposite tendency.…”

Section: Thermal Conductivitysupporting

confidence: 91%

Physical and Thermal Properties of Concrete Subjected to High Temperature

Kakae

Miyamoto

Momma

et al. 2017

ACT

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The physical and thermal properties of concrete under high temperature are obtained in order to provide reference data for material models necessary to evaluate the structural integrity of steel plate concrete containment vessels (SCCV) under accident conditions. Various parameters, such as temperature, heating duration, temperature history (heating, cooling, and the post-cooling process), water binder ratio, cement type, and aggregate type, are considered. Data on the temperature dependence of physical properties (compressive strength, elastic modulus, strain at compressive strength, splitting tensile strength) and thermal properties (thermal expansion strain, specific heat, thermal conductivity) are obtained from concrete of the same mix proportion. The effects of the variables on the properties of concrete are clarified, and the differences between test results and existing codes, such as the Eurocode, are highlighted.

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Section: Thermal Conductivitysupporting

confidence: 91%

Physical and Thermal Properties of Concrete Subjected to High Temperature

Kakae

Miyamoto

Momma

et al. 2017

ACT

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“…The reversible α-quartz to β-quartz inversion [11,19], which involves a no mass loss volume increase of 0.85% [8]. 'g' Endothermic peak, Decarbonation of calcium carbonate (vaterite).…”

Section: Dta/tga Resultsmentioning

confidence: 99%

“…'g' Endothermic peak, Decarbonation of calcium carbonate (vaterite). mass loss 'h' Endothermic peak, Decarbonation of calcium carbonate (calcite) mass loss [9,11,12,19]. * Endothermic peak, Unidentified structural change.…”

Section: Dta/tga Resultsmentioning

confidence: 99%

The effect of concrete composition on laser scabbling

Peach

Petkovski

Blackburn

et al. 2016

Construction and Building Materials

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Laser concrete scabbling is the process by which the surface layer of concrete may be removed through the use of a low power density laser beam. The main aim of this investigation was to establish relationships between laser interaction time and volume removal for a wide range of material compositions, including different w/b ratios, binder compositions (OPC/PFA), aggregate/binder ratios and coarse aggregate sizes. The results show that 25% replacement of ordinary Portland cement with pulverised fuel ash and/or a reduced water/binder ratio improves the efficiency of scabbling of cement pastes. Mortars and cement pastes were seen to scabble at a constant rate, whereas concretes experienced a peak rate, after which volume removal reduced dramatically. Basalt aggregate concrete was less susceptible to laser scabbling than limestone aggregate concrete. The effects of composition on the mechanisms which drive laser scabbling are discussed. It is suggested that pore pressure spalling governs behaviour in cement pastes, and thermal stress spalling is more dominant in mortar specimens. The driving force responsible for laser scabbling of concretes is developed within the mortar.

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“…A possible explanation for this lies in the effect saturation has on thermal conductivity: as water is more conductive than air, heat will transfer through a saturated specimen easier [12]. This will cause heat (and consequently pore pressures) to spread out deeper within the specimen, and over a larger area, during laser interaction.…”

Section: The Effect Of Thermal Conductivitymentioning

confidence: 99%

“…Furthermore, the increase in scabbling with aggregate content may be a result of an increase in thermal conductivity due to an increase in silica content [12,13]. Silica is a dense material and as a result, it is naturally a good conductor.…”

Section: The Effect Of Thermal Conductivitymentioning

confidence: 99%

Laser scabbling of mortars

Peach

Petkovski

Blackburn

et al. 2016

Construction and Building Materials

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Laser scabbling of concrete is the process by which the surface layer of concrete may be removed through the use of a low power density laser beam. Previous research has suggested that the driving force responsible for laser scabbling is developed within the mortar. The aim of this investigation was to establish the key parameters that influence laser scabbling of mortars. The results show that the removal of free water from mortars prohibits scabbling, but resaturation allows mortar to scabble. A reduced permeability, either due to a reduction in the water/binder ratio or the use of 25% PFA replacement, enhances the scabbling. A higher fine aggregate content increases volume removal and fragment sizes during laser scabbling.

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Effect of temperature on steel and concrete for PCRV's

Cited by 68 publications

References 4 publications

Physical and Thermal Properties of Concrete Subjected to High Temperature

Physical and Thermal Properties of Concrete Subjected to High Temperature

The effect of concrete composition on laser scabbling

Laser scabbling of mortars

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