Tomass Kozlovskis

Verified email at gmail.com

Research Assistant, Faculty of Civil Engineering, Institute of Civil Engineering and Renovation
Riga Technical University



                                         

https://researchid.co/t.kozlovskis

EDUCATION

Bachelor of Civil Engineering, Riga Technical University, Faculty of Civil Engineering, Riga, Latvia (September 2017 — Present: Professional Bachelor's Degree)
Bachelor of Architectural Technology and Construction Management, Copenhagen School of Design and Technology, Copenhagen, Denmark (September 2013 — February 2016: Professional Bachelor's Degree)
Architectural Technology, George Brown College, Toronto, Ontario, Canada (September 2013 — December 2013: Exchange studies abroad, 1 semester)

RESEARCH INTERESTS

Innovative cement composites, digital image correlations (DIC), long-term properties of materials, creep, concrete

6

Scopus Publications

Scopus Publications

  • Tensile creep of cement and concrete composites: Monitoring by means of 2D-digital image correlation
    Andina Sprince, Tomass Kozlovskis, Rihards Gailitis, Juozas Valivonis, Kinga Korniejenko, and Arnaud Castel

    Applied Sciences (Switzerland), eISSN: 20763417, Published: September 2021 MDPI AG
    Creep and shrinkage of Cement and Concrete Composites (CCC) are significant properties that need to be considered to use these materials in practice. Many previous scientific studies revealed CCC creep characteristics under sustained compression and shrinkage, using traditional test methods from design standards. Because of the complexity of experimental procedures, CCC creep in tension has not been studied as close. Furthermore, there is no unified standard that proposes applicable testing methods or specific testing apparatus. This study examines the suitability of 2D—Digital Image Correlation (DIC) to observe the creep deformations of specimens under tension. Ordinary Portland cement (OPC) mortar with 1% polyvinyl alcohol (PVA) fibres has been investigated in the research. Compact tension (CT) specimens 150 × 150 × 12 mm (with a notch) were used. Creep deformations under sustained uniaxial tension (applied loading corresponding to 60% of the ultimate strength) were measured. DIC images were captured using an entry/mid-level DSLR camera. Results show that DIC is suitable for studying uniaxial tensile creep of cement and concrete composites. Deformation of specimens in tension was similar to that measured using the conventional method (using surface-attached gauges).


  • Long-term properties of cement mortar under compression, tension, and 3-point bending
    N. Vatin, A. Sprince, R. Gailitis, L. Pakrastins and T. Kozlovskis

    Magazine of Civil Engineering, eISSN: 27128172, Volume: 105, Published: 2021
    Cement composite long-term property assessment usually is limited to the compression strain state due to the difficulty of performing long-term tests in tension and 3-point bending. This paper shows the difference in long-term properties in compression, tension, and 3-point bending for plain ordinary Portland cement mortar (OPC). The obtained results were compared to reinforced specimen results to determine whether the PVA refibres improve the long-term properties of OPC mortar in various stress-strain conditions. Cylinders, compact tension specimens (CT), and beams – plates were prepared to evaluate material properties and the role of fibre reinforcement in these different stress states. Additionally, to conventional surface-attached strain gauges, 2D-DIC was employed to observe the creep strain of specimens in tension. This paper aim to determine long-term property differences in compression, tension and 3-point bending and, also, to see if low amount PVA fibre incorporation improve long-term properties in previously stated stress-strain states. It was determined that the usage of 1 % of PVA fibres increases creep strains in compression on average by 15 % and reduced by 7 % in tension. It reduces shrinkage strain by 18 % in compression and 8 % in tension. The long-term deflection for the PVA fibre-reinforced specimens are, on average by 55 % higher than for plain OPC mortar specimens in 3-point bending.

  • Plain Geopolymer Concrete Cross-Section Surface Analysis After Creep and Shrinkage Tests in Compression and Tension
    Rihards Gailitis, Andina Sprince, Leonids Pakrastins, Kinga Korniejenko, and Tomass Kozlovskis

    RILEM Bookseries, ISSN: 22110844, eISSN: 22110852, Pages: 13-24, Published: 2021 Springer International Publishing

  • Drying Shrinkage Deformation Comparison between Foam Concrete, Geopolymer Concrete, Disintegrated, and Non-disintegrated Cement Mortar
    R Gailitis, A Sprince, L Pakrastins, G Sahmenko, and T Kozlovskis

    IOP Conference Series: Materials Science and Engineering, ISSN: 17578981, eISSN: 1757899X, Volume: 660, Published: 5 December 2019 IOP Publishing

  • Comparison of the long-term properties in compression of different size foamed concrete
    Rihards Gailītis, Andina Sprince, Leonids Pakrastins, Genadijs Shakhmenko, and Tomass Kozlovskis

    Vide. Tehnologija. Resursi - Environment, Technology, Resources, ISSN: 16915402, Pages: 41-44, Published: 2019 Rezekne Academy of Technologies
    Foamed concrete has been used as a building material since the early 1920s. In the beginning, it was used as an insulation material with very low density. Since then there have been attempts to make this material more load-bearing and structural. In the present-day foamed concrete is being used in soil reinforcement, manufacturing of building blocks and other sorts of construction materials. [1] The aim of this article is to determine long-term properties and strength of foamed concrete specimens as well as compare the results between two differently sized foamed concrete specimens. The size of creep and shrinkage specimens were Ø46x190 mm and Ø75x180 mm. The creep properties of the specimens were determined by loading them with 20% of the ultimate stress value. [2] The compressive strength, creep and specific creep of specimens were determined as well as specimen size factor to creep deformations.

RECENT SCHOLAR PUBLICATIONS

    INDUSTRY EXPERIENCE

    Research Assistant at Riga Technical University, Institute of Civil Engineering and Renovation, Riga, Latvia (April 2019 — Present)
    Designer, CAD Tracer at SIA JaunRigaECO, Riga, Latvia (October 2018 — October 2019)
    Designer, CAD Tracer at Wolf System SIA, Cesis, Latvia (July 2018 — August 2018)
    Designer, CAD Tracer at Wolf System SIA, Cesis, Latvia (April 2016 — August 2017)