Korjakins

Aleksandrs Korjakins
Title: Dr.
Country of residence: Latvia
Institution: Riga Technical University - Institute of Materials and Structures
Address: Kalku st 1, Riga
Telephone: +371 67089248
Date of birth: 20/01/1963
Early Stage Researcher: No
Sex: Male
MC Member: Yes

In the framework of this COST Action envisaged considered and evaluate  the existing building renovation possibility applying advanced Technologies which one elaborated in EU with aim to reach low or zero energy consumption. The main interests are concerned to traditional and advanced building technologies and materials, evaluation of influence these one on building insulation and durability. Evaluation the Latvian legislation and comparison this one with other European countries from point of views the advanced technologies introduction and realization for low energy building erection and renovation. Evaluation the factors influenced on applying new technologies for creation low energy building.

Publications
  • Korjakins, A., Toropovs, N., Kara, P., Upeniece, L., Šahmenko, G. Application of Peat, Wood Processing and Agricultural Industry by-Products in Producing the Insulating Building Materials. Journal of Sustainable Architecture and Civil Engineering, 2013, 1(2), 62.-68.lpp. Summary: in the present paper thermal insulation materials were designed, their mechanical and insulation properties were optimized. Special attention is paid to the peat, wood processing industry and agricultural by-products which are used in composite production. The activation of the raw materials allows not only to improve existing properties and open the new ones but also to make greater use of natural resources. Variety of the insulation materials was obtained using peat glue as binder and using different fractions of the wood chips, peat and hemp as fillers.
  • Bajāre D., Korjakins A., Kazjonovs J., Rozenštrauha I. Pore Structure of Lightweight Clay Aggregate Incorporate with Non-Metallic Products Coming from Aluminium Scrap Recycling Industry // Journal of the European Ceramic Society . - Vol.32, Iss.1 . (2011) pp 141-148. Summary: In the present studies, lightweight expanded clay aggregates were produced from natural plastic clay and NMP. They were obtained recovering Al metal from black dross by using conventional metallurgical process. The effect of raw material composition, previous treatment of NMP and sintering temperatures on the aggregate’s properties were evaluated. Physical and microstructural properties of sintered aggregates were determined.
  • Korjakins A., Bajāre D., Upeniece L. High Efficiency Porous Ceramics for the Production of Insulation Buildings Materials // Advanced Construction 2012: Proceedings of the 3rd International Conference, Lithuania, Kaunas, 18.-19. October, 2012. - pp 116-123. Summary: Marketable building materials such as heat insulation materials have significant impact on the environment both at stage of exploitation and at stage utilization after exploitation. Nowadays the improvement of energy and environmental performances are relevant targets as the building sector is strategically important for achieving sustainability.
  • Bajāre D., Kazjonovs J., Korjakins A., Merijs-Meri R. Development of Cement and Lime Based Plaster with Microencapsulated Phase Change Materials (PCM) // Innostock 2012: The 12th International Conference on Energy Storage, Spānija, Lleida, 16.-18. maijs, 2012. - 1.-7. lpp. Summary: Demand for higher thermal comfort and climate changes have brought new challenges for designers of cooling systems, because of increased usage of air conditioning in building environment, resulting in higher electricity demand and CO2 emissions. Today the thermal energy storage plays an important role in building energy conservation, which can be achieved by the incorporation of PCM into building envelope. PCM incorporated in plaster absorb redundant heat, which leads to improved thermal inertia of the building, lower and shifted in time temperature peaks. Thus increasing thermal comfort, reducing load of HVAC systems and electric energy consumption. References have been found for improving the thermal properties of concrete and plasters containing PCM.
  • Korjakins A. Improving the Quality of Suburbuan Building Stock in Latvia. Definition the suburbuan building stock, 2012, COST TU0802, 85-105 pp Summary: The obtaining independence of Latvia in the 1990 change priority in the city development course. Different urban programs have been developed for improving quality of life in the suburban building stock. The innovation consists in involving European funds, private investors as well as using cities public funds
  • Bajāre D., Kazjonovs J., Korjakins A. The Thermal Characteristics of Gypsum Boards with Phase Change Materials (PCM) // Environment. Technology. Resources: Proceedings of the 8th International Scientific and Practical Conference , Latvija, Rēzekne, 20.-22. jūnijs, 2011. - 132.-138. lpp. Summary: Two types of PCM were investigated for use in phase change gypsum boards: salt hydrate and paraffin. The transition temperatures, or melting temperatures, of the PCM is near to standard or suggested room temperatures 20-21 °C for heating-dominated climates or 25-27 °C for cooling-dominated climates. Phase change gypsum boards were produced by using three different methods: simple immersion for 1 hour and direct incorporation of raw and microencapsulated PCMs in 5 and 10% of composition mass. PCM were tested and the effects of energy conservation of PCM gypsum boards were determined. Also some phisical and mechanical properties were determined to investigate the effect of PCM addition to gypsum boards.
  • Korjakins A., Šahmenko G., Bajāre D., Būmanis Ģ. Application a Dolomite Waste as Filler in Expanded Clay Lightweight Concrete // The 10th International Conference Modern Building Materials, Structures and Techniques, Lithuania, Vilnius, 19.-21. May, 2010. - pp 156-161. Summary: Manufacturing of cement based building materials incorporating alternative filler, obtained as a waste from industrial process, nowadays becomes more and more actual. It could be related not only to the cheaper expenses of the production if to compare with adequate products made of conventional raw materials, but also to the efforts to improve the quality of environmental. Investigations were carried out to explore the suitability of dolomite waste as fillers in expanded clay lightweight concrete by partly substituting of conventional quartz sand. The goal of the study is to examine expanded clay lightweight concrete mechanical and physical properties by making a comparison between traditional expanded clay lightweight concrete and units which containing different amount of dolomite waste. Physical properties such as density, porosity and absorption were determined. Tests were also performed to determine mechanical properties. Frost resistance and durability were tested