Dr. Khrystyna Moskalova
Universsity North, Koprivnica, Koprivničko-Križevačka Županija, Croatia
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Academic Career Length
10Years (2017-Present)
(Calculated once Scilit publication data is synced: current year − year of first publication + 1)
Representative Publications
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Journal Article
Khrystyna MoskalovaTLTatiana Lyashenko
Tatiana Lyashenko
Aleksej AniskinThe rheological properties of fresh plaster mortars, with varied contents of porous fillers and polymer admixtures, have been studied. The quantities of fine limestone and expanded perlite, and dosages of methyl hydroxy ethyl cellulose and ethylene vinyl acetate were varied in the experiment. Effective viscosity (at a shear rate from 0.045 to 5.705 s−1) and the thixotropy of the mixes were determined with rotational viscometer for 18 compositions (according to the design of the experiment). Each of the 18 viscosity curves were described with the Ostwald–de-Waele equation. The Experimental–Statistical models describing the dependencies of the parameters of the rheological model and of mix thixotropy on the composition factors were built on the obtained data. ES-models have allowed the individual and synergetic effects of mix components on the rheological characteristics to be evaluated. The expanded perlite powder can increase the viscosity by two times, probably due to its pozzolanic effect increasing the content of the CSH phase during cement hydration. The thixotropy can be increased by the quantity of limestone. The computational experiments with ES-models have made it possible for the information set, without a noticeable interrelation between rheological characteristics, to be stratified into subsets, in which such interrelations differ significantly.
Journal Article
Khrystyna MoskalovaAleksej AniskinGKGoran Kozina
Goran KozinaBSBožo Soldo
Božo SoldoThis paper investigates the effect of polymer modifiers (re-dispersible powder, multifunctional additives, methylhydroxyethylcellulose) on the rheological behavior of emulsions, saturated of calcium hydrosilicates to simulate a hydrating cement structure. The subjects of the study were modified emulsions which had varied concentrations of each additive and they were examined comparatively to a base emulsion. Tests were performed with a CR-rheometer (“Himpribor-1”, Tula, Russia) applying the Searle measuring principle at various shear rates to characterize viscosity properties. The performance of modified mixtures within the operating period was analyzed by using two parameters—effective viscosity (η) and the proportion of structural failure (|m|). The test results showed that the most important factor influencing rheological characteristics is the addition of methylhydroxyethylcellulose additive—the higher additive amount in the emulsion, the higher the viscosity. Furthermore it was noted in the work that adding olefin sulfonate sodium salt causes reduced viscosities as well as lower shear moduli. If ethylhydroxyethylcellulose and ethylene vinyl acetate additives are used in the same mixture together, the rate of structural failure |m| can be relatively similar and low regardless of whether the mixture has large or small viscosity values.
Journal Article
Khrystyna MoskalovaTLTatiana Lyashenko
Tatiana LyashenkoAleksej AniskinMOMatija Orešković
Matija OreškovićThe influence of the components of plaster mortars on their properties is considered in a lot of studies at a qualitative level without searching for optimal compositions of these multicomponent composite materials. The purpose of this study was to obtain the experimental–statistical models based on the results of the designed experiment, allowing the influence of light fillers and polymer admixtures on the properties of the mortars to be evaluated and analysed; the compositions complying with specified requirements and compromised optimally by a number of properties should be found. The quantities of fine limestone and perlite as well as of the hydroxyethyl methyl cellulose and dispersible polymer were varied in the experiment. The effective viscosity and thixotropy of the mix, compression, tensile, adhesive strength, frost resistance, and density of hardened mortars were determined for 18 compositions according to the experiment design. The obtained models have allowed the individual and synergetic effects of mix components to be evaluated. The fine perlite has turned out to have the greatest positive effect on the properties. This porous filler increases the strength while decreasing the density of the mortars. It is shown how the composition complying with specified requirements—and the best based on several properties—has been found.
13 September 2024 in Technobius
Journal Article
AAAliya K. Aldungarova
Aliya K. Aldungarova
Tymarkul MuzdybayevaAMAssel Mukhamejanova
Assel Mukhamejanova
Nurgul AlibekovaKhrystyna MoskalovaSKSabit Karaulov
Sabit KaraulovThis study compares Kriging and Inverse Distance Weighting (IDW) spatial interpolation methods for estimating intermediate soil properties at a construction site in Astana, Kazakhstan. Using data from eight boreholes, seven engineering geological elements (EGE) were identified and analyzed at 6.5 m and 11.5 m depths. Kriging produced deformation modulus values ranging from -0.29 to 18.99 MPa at 6.5 m and -0.51 to 23.94 MPa at 11.5 m, capturing more spatial variability compared to IDW, which provided ranges of 3.3 to 18.99 MPa and 2.6 to 23.99 MPa, respectively. Kriging’s ability to account for spatial correlations resulted in more accurate predictions, particularly in areas with complex subsurface variability. Meanwhile, IDW offered reliable localized results, effective in more uniform geological conditions. The findings demonstrate that both methods are valuable for geotechnical applications, with the choice depending on data density and site variability.
30 June 2023 in Technobius
Journal Article
Khrystyna MoskalovaAleksej AniskinMOMatija Orešković
Matija OreškovićŽKŽeljka Kovač
Željka KovačDry mix mortars are becoming more and more popular in the world’s building materials market. Therefore, the issue of increasing the technological and mechanical properties of stucco mixes is relevant. The aim of the paper is modification of lightweight dry stucco mixes with fine limestone and perlite as well as with hydroxyethyl methyl cellulose and dispersible polymer. In order to investigate the different mixes, an 18-point experiment was designed. Density, compressive strengths and crack resistance of dry plaster mixes were studied using requirements of standard. Mathematical models were obtained for the compositions as a result of processing the experimental data. The regularities of the fillers’ and additives’ influence on the properties of the mixes were established, depending on their amount and combination. It was observed that methyl hydroxyethyl cellulose improves the crack resistance and compression strength, and contributes to a slight decrease in density. The crack resistance of plaster mortars changes more than 1.5 times, the most crack-resistant compositions have an average amount of porous fillers.
30 September 2023 in Technobius
Journal Article
Aleksej AniskinDKDalibor Kramarić
Dalibor KramarićDŠDamir Štuhec
Damir ŠtuhecKhrystyna MoskalovaTechnobius is a peer-reviewed open-access journal that publishes original research articles of experimental and technical nature in the field of construction and building materials
About Me
Assist. Prof. Dr. Sc. Khrystyna Moskalova is a Senior Expert Associate at the Research and Development Department of the Metal Industry Training Centre, “Metal Centre Čakovec,” and an external employee (Assistant Professor) at the University North (Croatia). From 2008 to 2022, she worked as an Assistant Professor in the Department of Processes and Apparatus in Building Materials Technology at the Odessa State Academy of Civil Engineering and Architecture (OSACEA). She earned her PhD (Technical Sciences) in 2013 and has held the scientific-teaching grade of Assistant Professor since 2017. She received awards for academic excellence by the Rector of OSACEA and also received recognition from the Ministry of Education and Science of Ukraine. She participated in developing an educational program in STEM Fields, “Lori” (Croatia). She is a member of the organizing committees for several international conferences and, since 2018, has participated in University North research grants focusing on material properties and optimal plaster compositions. She has published over 20 scientific papers indexed in the Scopus and Web of Science databases. Her teaching disciplines include thermodynamics, materials science, the technical mechanics of fluids and gases, metallurgy and welding, and metrology and standardization. Her research interests include lightweight plasters, rheological properties, and recycled masonry aggregates.