| Topic title |
Possible scientific supervisors |
Source of funding |
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The reinforcement shadows on the visible surface of precast concrete element
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prof. dr. Mindaugas DAUKŠYS |
state-funded |
Research Topic Summary.
The appearance of darker lines on the surface of the product results from changes in the structure of hardened cement paste around the reinforcement bars during the product manufacture. Literature analysis showed that the main cause of the changes in the structure of hardened cement paste has not been found yet. The effect of reinforcement shadows is one of the most difficult technological processes to control in precast concrete manufacture. The research topic solving relevant issues has been coordinated with UAB INHUS Prefab. The object of the research is the reinforcement shadows on the surface of precast concrete element. The aim of the research is to determine the causes of reinforcement shadows on the surface of precast concrete product and to develop recommendations for controlling this negative effect. The relationship between technological properties of concrete mixture, properties of the moulds, technological parameters of concrete mixture casting and compacting and the negative effect of reinforcement shadows determined after the planned research and analysis of research results will make it possible to predict the changes in the structure of hardened cement paste around the reinforcement bars on the visible surface of the precast concrete element. Recommendations for producers of concrete mixtures will be developed basing on the obtained research results. The research results will be used to develop recommendations for precast concrete product manufacturers so that reinforcement shadows on the visible surface of the product can be controlled or prevented.
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Influence of Construction Information Classification on the Maturity Level of a Digital Twin of the Built Environment
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doc. dr. Darius PUPEIKIS |
state-funded |
Research Topic Summary.
The digital representation of building, system and asset is called Digital Twin (DT). It’s a realistic and dynamic digital replica of an object that is enriched with historical and real-time data. Interdisciplinary based technology combines Building Information Modeling (BIM) methodology, Internet of Things (IoT), reality capturing (photogrammetry, LiDAR), GIS (Geographic Information Systems), remote sensing and monitoring systems. Digital twins are an important component of a smart city, enabling the sustainable development of the built environment. Classified and digital construction information is an important basis for the creation of digital twins, which enables machine (computer) data to read, analyze, interpret and predict the future situation. Data classified according to the established structure is critical for performing simulations (energy performance, evacuation, fire and smoke spreading, flooding, structural behaviour, operation of MEP systems, etc.), automating construction or product production, optimizing the management and maintenance of buildings.
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| The systems of alkali activated materials under elevated temperatures |
prof. dr. Danutė VAIČIUKYNIENĖ |
state-funded |
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Smart building integration into a smart city: evaluation framework
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doc. dr. Rasa APANAVIČIENĖ |
state-funded |
Research Topic Summary.
Smart buildings are the key elements of the built environment of a smart city. A smart building is described as ensuring the comfort and efficiency of the people living/ working in it by means of information and communication technologies. The performance of smart cities is highly dependent on the buildings. It is therefore important to investigate which features would be critical in adapting buildings to the digital smart city platform and to identify the integration requirements that construction projects must meet in order to respond to the overall smart city context. Recent challenges for the development of smart buildings and smart cities are related to digitalisation: the adaptability of buildings to the new urban ecosystem, adaptation to the environment, information collection and transmission, real-time information transmission, information management and action control. Therefore, a new approach based on a combination of two separate areas describing the main principles of smart building integration into a smart city within the new evaluation system is relevant.
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| Synthesis of artificial aggregates suitable for concrete and roads with ash from cogeneration plants, and research of properties of these aggregates |
prof. dr. Vitoldas VAITKEVIČIUS |
state-funded |
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The Analysis of Self-Healing Concrete Structure and Investigations on Crack Healing Durability
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prof. dr. Žymantas RUDŽIONIS |
state-funded |
Research Topic Summary.
It is known that the concrete degradation occurs faster in damaged areas of the structure or cracks, because it absorbs moisture from the environment, accelerating the corrosion processes of concrete and reinforcement. Therefore, it is important that the concrete is impermeable and free of cracks, but often the latter occur during operation due to destructive environmental influences and/or mechanical loads. Water carries chemical elements through cracks, dissolves minerals, and binds with them into new compounds. Moisture content fluctuates more in dams, reservoirs, and parking lot or concrete floors compared with other structures. Water vapor diffusion in concrete often causes a variety of operational problems. Moisture penetration kinetics of a building for, example ground floor, is a variable phenomenon and highly dependent on ambient temperature. Such structures are affected by construction, ground, and hygroscopic, condensing and operating humidity. Humidity kinetics in concrete depend on the composition of the raw materials, the structure formed (type of pores, size, their distribution and the nature of the resulting cracks) as well as on the operating environment. For these reasons, the waterproofing of buildings, which is constantly exposed to moisture or direct water, due to the aging process must be constantly renewed, which affects the rising cost of maintenance of buildings and complicates the uninterrupted operation of structures.For more details please contact the supervisor of the topic.
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Next-generation building performance systems for improving perceived indoor conditions, schoolchildren performance and wellbeing
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doc. dr. Lina ŠEDUIKYTĖ |
state-funded |
Research Topic Summary.
The indoor environment quality (IEQ) and thermal comfort in educational institutions are relevant for the European Union and globally. Nowadays, there is a growing conflict between energy savings/efficiency and ensuring comfortable microclimate conditions for people indoors. There is a debate among researchers, what is more important? There is a lack of new-generation, sustainable, and smart solutions to improve IEQ in schools and students’ performance. It is crucial nowadays in the case of various airborne viruses (such as COVID-19 and others). There is a lack of research data for the microclimate conditions in Lithuanian schools. Also, there are no new and smart indicators which could be proposed for a harmonized assessment of the indoor microclimate. The aim of the study is the complex analyses of the microclimate conditions in classrooms; to propose smart indicators for a harmonized assessment of the indoor microclimate; to create sustainable and smart heating/ventilation system that ensures good performance and comfortable conditions for both students and teachers.
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Development of Sustainable Usage of Natural Resources in Building Engineering Systems
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prof. dr. Tadas ŽDANKUS |
state-funded |
Research Topic Summary.
One of the non-traditional solutions to reduce energy consumption for heating a building during cold and cooling during hot periods is the construction of the deep or underground building. In this case, the impact of the wind is completely or partially eliminated, and it an influential factor that significantly affects heat loss to the atmosphere. Even at shallow depth, the ground temperature in the cold period is higher than that of the ambient air, and as the depth increases, the ground temperature continues to rise. During the preliminary numerical simulation, the largest increase in ground temperature was noticed at the outside of the deepened walls of the building. Increased ground temperature worsens the conditions for heat exchange through the external partitions, which means lower heat loss. The aim of the research: Development of sustainable usage of natural resources in building engineering systems - reduction in energy consumption of a building in the case of the deepened buildings. Research methodology: Numerical simulation in parallel with experimental research. Practical application: The results and proposed solutions will be focused on the practical application in the engineering systems of the active building; herewith it will contribute to climate change mitigation policy.
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Investigation of performance and durability of sealing tapes for building airtightness accomplishment
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m.d. dr. Vaida DOBILAITĖ |
state-funded |
Research Topic Summary.
An essential prerequisite for energy efficiency is the long-term airtightness accomplishment of the building. Tape sealing materials are used for sealing films and sheet materials, for attaching them to structures, as well as for sealing structural joints. During an operation of building these sealing tapes are subject to variable humidity and temperature conditions. A temperature and humidity of the surfaces to which the sealing materials are applied changes as well, causing tapes to damage. Changes in the properties of the sealing materials and their adhesion to the surfaces of various materials during the operation of the building may cause a significant decrease in the airtightness accomplishment of the building. Therefore, it is important to investigate the changes in the deformability, breaking strength and tear resistance of tape sealing materials and to determine changes in the strength of adhesion of these materials to various surfaces during the operation of a building.
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Investigation of textile waste utilization for interior decoration panels
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v.m.d. dr. Milda JUCIENĖ |
state-funded |
Research Topic Summary.
The aim of the research is to investigate the possibilities of producing materials from textile waste for interior decoration of buildings. It is planned to make interior panels from different textile waste using different textile materials. The main properties of panels (such as strength, impact resistance, chemical resistance, etc.), the acoustic properties of the panels, the durability of the panels will be evaluated. The result of this research is the development of a prototype - an interior panels for the buildings.
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Optimization of area of transparent partitions of Energy-efficient residential buildings
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v.m.d. dr. Raimondas BLIŪDŽIUS |
state-funded |
Research Topic Summary.
The transparent partitions of energy-efficient buildings are evaluated not only of natural lighting and visual controlling, but also of solar heat gain that reduce the heat demand of the building for heating in the cold season and cause overheating in the summer, and therefore the energy efficiency decreases when cooling the buildings. The thermal comfort of the rooms is also associated with the amount of glazing of the external walls: the transparent partition in energy-efficient buildings remains 8-10 times more heat conductive element compared to other partitions, therefore, besides the glazed external partitions; conditions of lower thermal comfort are created, as compared to the other surfaces of the external partitions of the building. The purpose of the dissertation work is to investigate the influence of area of the transparent partitions on the heat losses, solar heat gain, indoor lighting, visual control of energy-efficient buildings and thermal comfort of the premises. To create a methodology for optimizing the area of transparent external partitions in energy efficient residential buildings on the basis of these studies.
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