Hygrothermal and mechanical model of concrete at high temperature

Majorana, C. E.; Salomoni, Valentina; Schrefler, Bernhard A.

doi:10.1007/bf02480710

Cited by 52 publications

(45 citation statements)

References 21 publications

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“…model adopted to perform radiation-induced damage analyses is the 3D research code NEWCON3D [1, 10, 19, 23-31, 34, 36-40]. Concrete is treated as a multiphase system where the micropores of the skeleton are partially filled with liquid water, both in the form of bound or absorbed water and free or capillary water, and partially filled with a gas mixture composed of dry air (non-condensable constituent) and water vapour (condensable), supposed to behave like an ideal gas [1,24,27,40].…”

Section: The Mathematical Modelmentioning

confidence: 99%

Radiation damage evaluation on concrete shielding for nuclear physics experiments

Pomaro

Salomoni

Gramegna

et al. 2011

Ann. Solid Struct. Mech.

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Concrete is commonly used as a biological shield against nuclear radiation. As long as, in the design of nuclear facility, its load carrying capacity is required together with its shielding properties, changes in the mechanical properties due to nuclear radiation are of particular significance and may have to be taken into account in such circumstances. The study presented here allows for reaching first evidences on the behavior of concrete when exposed to nuclear radiation in order to evaluate the consequent effect on the mechanical field, by means of a proper definition of the radiation damage, strictly connected with the strength properties of the building material. Experimental evidences on the decay of the elastic modulus of concrete have allowed for implementing the required damage law within a 3D F.E. research code which accounts for the coupling among moisture, heat transfer and the mechanical field in concrete treated as a fully coupled porous medium. The upgrade of the numerical model allows for assessing the durability of concrete under the effects of a radioactive environment; considerations on the ultimate strength resource in the lifetime of a nuclear structure can finally lead to its restoration in the damaged parts of the concrete slabs to preserve their load bearing capacity. The development of the damage front in a concrete shielding wall is analyzed under neutron radiation and results within the wall thickness are reported for long-term radiation spans and several concrete mixtures in order to discuss the resulting shielding properties

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Section: The Mathematical Modelmentioning

confidence: 99%

Radiation damage evaluation on concrete shielding for nuclear physics experiments

Pomaro

Salomoni

Gramegna

et al. 2011

Ann. Solid Struct. Mech.

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show abstract

“…In fact, by considering the humidity transport and dehydration phenomena effectively taking place in concrete (see e.g. [2,11]) so that this section will be subjected to the highest thermal flux, it will sustain even the highest internal overpressures with the possibility of being exposed to spalling [12]; such a phenomenon is to be clearly avoided during first heating.…”

Section: Analysis Of the Channel Initial Sectionmentioning

confidence: 99%

Conceptual Study of a Thermal Storage Module for Solar Power Plants with Parabolic Trough Concentrators

Salomoni¹,

Majorana²,

Giannuzzi³

et al. 2013

Application of Solar Energy

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The thermal storage technology (TSE) has a relevant strategic importance for the success of solar plants devoted to electric energy and heat production. The major benefits in the use of storage include higher efficiency and reduction in the mean levelled cost of the electric energy unit (LEC). Sensible heat storage systems within solid media have been identified, both technically and economically, as a very promising solution. The development of such a storage technology, adopting concrete, could reduce the specific cost to less than 20€ per kWh of thermal capacity; additionally, such a solution is suitable for small-medium size plants with a power ranging from 1 MW to 5 MW, to be easily introduced in the Italian territory and with reduced operational and maintenance needs. In large size CSP systems, as the ARCHIMEDE plant built by ENEL with ENEA technology, a high temperature fluid storage (between 400 and 500°C) is required. Such a temperature seems at present not adequate to allow for adopting concrete, whereas the production of concrete able to sustain 250-300°C appears as a reachable objective. It is supposed to study a storage system characterised by a parallelepiped structure with appropriate section, selfbearing and supported on its major axis, as well as by a piping system directing the thermovector fluid within the cemented matrix

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“…moist air, is a mixture of dry air (non-condensable constituent) and water vapour (condensable gas), and is assumed to behave as an ideal gas. The approach here is to start from a phenomenological model (Schrefler et al, 1989;Majorana et al, 1997;Majorana et al, 1998;Majorana & Salomoni, 2004 (b); ), originally developed by Bažant and co-authors, e.g. (Bažant, 1975;Bažant & Thonguthai, 1978;Bažant & Thonguthai, 1979;Bažant et al, 1988), in which mass diffusion and heat convection-conduction equations are written in terms of relative humidity, to an upgraded version in which its non-linear diffusive nature is maintained as well as the substitution of the linear momentum balance equations of the fluids with a constitutive equation for fluxes, but new calculations of thermodynamic properties for humid gases are implemented too to take into account different fluid phases as well as high ranges of both pressure and temperature.…”

Section: Mathematical-numerical Modeling Of Concretementioning

confidence: 99%

“…The results in terms of R.H. (a) and temperature (b) are presented in Figure 17 (3D plot): the development of the R.H. bowl in time (along a typical tank section) is clearly evident; the peaks in R.H. for the zone closest to the heated surface are not referable to the phenomenon of "moisture-clog" (Majorana et al, 1998;Chung et al, 2006), because of the limited value of the temperature gradient, but anyway it is driven by the coupling between humidity and temperature fields and it is connected to the low intrinsic liquid permeability of the adopted HPC. Once 100°C has been reached, concrete starts depleting itself of water, thereby making the relative humidity values tend towards zero (but very slowly: in fact, after about 4 months, a concrete thickness of about 255 mm is still in saturated conditions).…”

mentioning

confidence: 99%

New Trends in Designing Parabolic trough Solar Concentrators and Heat Storage Concrete Systems in Solar Power Plants

Salomoni¹,

Majorana²,

Giannuzzi³

et al. 2010

Solar Energy

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Hygrothermal and mechanical model of concrete at high temperature

Abstract: RI~ S U M EA computational model allowing for the thermohygrometric and mechanical analysis of concrete structures at high temperature by means of the finite element method is presented.

Cited by 52 publications

References 21 publications

Radiation damage evaluation on concrete shielding for nuclear physics experiments

Radiation damage evaluation on concrete shielding for nuclear physics experiments

Conceptual Study of a Thermal Storage Module for Solar Power Plants with Parabolic Trough Concentrators

New Trends in Designing Parabolic trough Solar Concentrators and Heat Storage Concrete Systems in Solar Power Plants

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