The list of national projects SAS
Institute of Construction and Architecture
Diffuse light in urban environment: A new model which embraces the optical properties of a local urban atmosphere
Difúzne svetlo v mestskom prostredí: nový model zohľadňujúci vlastnosti lokálnej atmosféry
| Duration: |
1.1.2020 - 31.12.2023 |
| Program: |
VEGA |
| Project leader: |
Mgr. Kocifaj Miroslav DrSc. |
| Annotation: | Due to elevated contamination by aerosols the diffuse light field in an urban environment differs from what we observe in city surroundings. The impacts on indoor daylight climate from different atmospheric turbidity conditions are also linked to emission sources in a city. Specifically, industry, public transportation, or construction work can produce particles that remain suspended in urban air for days or weeks and change the diffuse-light signatures. No quantification of the phenomena exists, no designed experiments have been performed and the theoretical development is in its infancy. Predictions from the present models are not accurate enough, so it is a great challenge of this project to develop a new optical model of urban atmosphere that 1) accounts for local scale parameters, 2) is applicable to arbitrary conditions, 3) can improve predictions of the diffuse-light patterns in a city, and 4) can be used by experts who deal with daylight and daylighting technologies. |
Effect of nano-, micro-, and meso-nonhomogeneities in the macroscale thermomechanical performance of composite structure members
Efekt nano-, mikro- a mezo-nehomogenít na makro termomechanické chovanie sa kompozitných konštrukcií
| Duration: |
1.2.2022 - 31.12.2023 |
| Program: |
SRDA |
| Project leader: |
Prof. Ing. Sládek Ján DrSc. |
| Annotation: | This project is aiming to develop methods for the analysis and optimization of the thermomechanical performance of nonhomogeneous structural members operating under thermal, electrical, and mechanical loadings. By aggregating achievements of both the Ukrainian and Slovak partners in the area of thermomechanics of nonhomogeneous structures and non-classical theories of continuum mechanics, we intend to develop advanced techniques for estimating effects of accumulated nano-, micro- and meso-nonhomogeneities in the macroscale performance parameters with account for the size effect, which were failed to be captured when utilizing the homogenization methods. The linear response of the electric polarization of the solids to the temperature gradient and coupled electro-elastic fields caused by a thermal inclusion in isotropic solids is to be studied based on the relations of a local gradient theory of electro-thermo-elasticity. The results are expected to improve the estimation of the thermoelastic performance of structural members and prediction of the feasible material profiles for nonhomogeneous composites for desired operational performance based on their functional designation. |
Material composition and properties of Self-Compacting Heavyweight Concrete
Materiálové zloženie a vlastnosti samozhutniteľných ťažkých betónov
| Duration: |
1.1.2021 - 31.12.2023 |
| Program: |
VEGA |
| Project leader: |
Prof.Dr.Ing. Palou Martin-Tchingnabé |
| Annotation: | The project is based on the development of heavyweight and self-compacting concretes based on cementitious composites containing admixtures (blast furnace slag, metakaolin and ground limestone), heavy aggregates (magnetite, barite or mixtures thereof) and superplasticizers. The project will determine the chemical composition of individual concrete components, including the presence of isotopes, heat during the hydration of cementitious composites, optimized grading curve of heavy aggregates and concrete composition so that the examined material has a bulk density more than 3000 kg / m3 and meets the requirements of self-compacting concretes, which means the capability to compact without any compaction force even at very dense reinforcement, without segregation and sedimentation of its constituents as determined by V-funnel and L-form. Short and long-term mechanical and physical properties of the resulting concrete will be investigated. Self-compacting heavyweight concretes have potential applications in nuclear power plants and in areas exposed to long-term nuclear radiation. |
Measuring and Modelling Light Pollution
Meranie and modelovanie svetelného znečistenia
| Duration: |
1.9.2022 - 31.8.2025 |
| Program: |
SASPRO |
| Project leader: |
Dr. Wallner Stefan BSc MSc |
| Annotation: | This project aims to investigate various approaches in measuring and modelling of the
global phenomenon of light pollution, artificial light at night which is misdirected, overilluminated
and/or makes use of harmful light. The ever-worsening phenomenon impairs
not only the visibility of objects on the night sky, furthermore it is a major threat for all
organisms worldwide, including human health suffering from impacts. Research goals of
MEMOLIPO include a greater understanding of atmospheric impacts on the night sky
brightness and how currently used measurement devices can show new approaches in their
application. Firstly, light monitoring network data underly strong seasonal variations which
can potentially falsify long-term analyses of light pollution development. Such must be
included in order to rightly give statements about increases or decreases in night sky
brightness values. Another research issue is the impact caused by atmospheric elements like
the aerosol optical depth. Latter will be investigated by meteorological ceilometer
backscatter data, providing data for this issue in an unprecedented accuracy. Furthermore,
airborne vehicles will be tested as potential devices to characterize atmospheric layers.
Moreover, it will be tested if easy retrievable ground-based measurements can approximate
the city emission function, a very important input for theoretical modelling. And finally, allsky
measurements will show, how far light domes from light emitting cities are visible and
could influence night skies above natural protected areas. Results from this project lead to
important insights in the understanding of skyglow phenomena and serve as inputs for
modelling approaches in the future. Outcomes shall also be used for research disciplines of
other fields, since it creates new fundaments for nature related studies in, e.g., ecology,
biology and environmental physics, or technical studies like lighting management,
sustainability and energy saving purposes. |
Multiscale study and modelling of composite macrostructures
Multiškálové štúdium a modelovanie kompozitných makrokonštrukcií
| Duration: |
1.1.2020 - 31.12.2023 |
| Program: |
VEGA |
| Project leader: |
Prof. RNDr. Sládek Vladimír DrSc. |
| Annotation: | The research project deals with the 2nd order two-scale computational homogenization procedure for modelling composite structures responses. Using the 2nd order homogenization approach, the multiscale analysis may describe more complex deformation modes than the standard 1st order homogenization. The determination of effective material coefficients including those staying at higher-order derivatives of field variables are needed in gradient theory. This can be done by comparing the solutions of certain appropriate boundary value problems (BVP) on the macro- and micro-level. In the microstructural analysis, the microstructural inhomogeneity is modelled and the BVP on the RVE are solved using ordinary local continuum theory. The higher-order continuity requirements in the macro-level formulation can be met by applying C0 continuous approximation independently to primary fields and their gradients, with obeying the kinematic constraints between approximations by collocation at some internal points of elements. |
Study of multicomponent cement material degradation under conditions simulating CO2 enriched geothermal environment
Štúdium degradácie viaczložkových cementových materiálov v dôsledku uhličitej korózie v podmienkach simulujúcich geotermálne vrty
| Duration: |
1.1.2021 - 31.12.2024 |
| Program: |
VEGA |
| Project leader: |
Ing. Kuzielová Eva PhD. |
| Annotation: | Justness of detailed study of degradation due to CO2 enriched geothermal environment is conditioned by development of new multicomponent, even lightweight, cementitious materials, which can be used for cementing in geothermal wells as well as by potential of geological sequestration of CO2. The project is focused on complex investigation of degradation mechanism at high temperatures and pressures, which is simultaneously affected by composition of geothermal water, hydration, pozzolanic and latent hydraulic reactions, but also by high-temperature transformations of primary reaction products. It is important to study carbonic corrosion from initial stage of hydration and to focus on synergism of different types of reactions in dependence on composition, physical and chemical basis of the used additives. The investigation under the conditions affecting kinetics and thermodynamics of reactions and evaluation of their impact on utility properties will allow the optimization of multicomponent cement compositions. |
Research and development of multi-component cementitious blends for special construction materials
Výskum a vývoj mnohozložkových cementových zmesí pre špeciálne konštrukčné materiály
| Duration: |
1.7.2020 - 30.6.2024 |
| Program: |
SRDA |
| Project leader: |
Prof.Dr.Ing. Palou Martin-Tchingnabé |
| Annotation: | The study of chemistry, phase evolution, and phase equilibrium during the hydration of multicomponent cementitious materials is a key challenge in the development of construction materials with high performance. Therefore,
1. the present project deals with the complex study of the effect of normal and hydrothermal curing conditions on hydration reaction of multicomponent cementitious binders for the objective of optimizing the composition of cementitious composites for high-temperature hydrothermal wells;
2. the project will develop heavyweight concrete based on the optimized composition of multicomponent cementitious binders and high-density aggregates. The concrete design will take into consideration the radioactive isotopes, in order to minimize the activation effect of gamma and neutron radiations, when it comes to being used as biological shielding in power nuclear plants;
3. the purpose of the present project is the development of advanced concrete materials, unique in its kind; Fiber-Reinforced Heavyweight Self-Compacting Mortars with special protection properties against ballistic missiles.
The common denominator of these objectives is the chemistry of hydration reaction, including kinetics and mechanisms, phase evolution, and equilibrium of composites comprising Ordinary Portland (OPC) cement and Supplementary Cementitious Materials (SCMs). Different curing regimes (ordinary, hydrothermal), complex chemical analysis including radioactive isotopes of each ingredient, the particle size distribution of binders and aggregates are some of the main factors which are the driving forces for the implementation of the submitted project. |
The energy efficiency of an innovative BIPV/T-TE-PCM module with PCM passive cooling
Výskum energetickej účinnosti inovatívnych BIPV/T článkov chladených PCM technológiou.
| Duration: |
1.1.2020 - 31.12.2023 |
| Program: |
VEGA |
| Project leader: |
RNDr. Kómar Ladislav PhD. |
| Annotation: | The objective of the presented proposal is to evaluate the efficiency of an innovative BIPV/T-TE-PCM (TE, thermoelectric; PCM, phase change material) for which little or no information is available. The emphasis is the operational performance assessment of proposed BIPV/T-TE-PCM module under practical conditions. The application of an integration model requires its coupling the building energy simulation with solar radiation availability models. The integration of PCM into a photovoltaic cell is important in terms of passive cooling of the panel, whose efficiency decreases with increasing temperature and also because of its prolonged service life, as thermal expansion can cause mechanical stress to the individual cell layers. In addition, the energy stored in the PCM will allow it to be used in the next phase, e.g. for water heating. The results will be structured in terms of the assessment analysis of this innovative BIPV/T-TE-PCM façade toward improving thermal comfort and energy efficiency of buildings. |
Improving Structural Safety and Energy Efficiency Through Development of Extreme Temperature Resistant Sustainable Cement-Based Composites with Post-Fire Self-Healing Features
Zlepšenie štrukturálnej bezpečnosti a energetickej účinnosti prostredníctvom vývoja trvalo udržateľných cementových kompozitov na báze cementu odolných voči extrémnym teplotám s funkciami samoopravenia po požiari
The total number of projects: 9
