Papers by Zymantas Rudzionis
KTU leidykla "Technologija" eBooks, Aug 8, 2017
Resources, conservation & recycling advances, Nov 1, 2022
Materials Today: Proceedings, 2021
Abstract This study is aimed to investigate the influence of carbon nanotubes and graphene nanopl... more Abstract This study is aimed to investigate the influence of carbon nanotubes and graphene nanoplates on the properties of lightweight concrete. Several lightweight concrete specimens were prepared with different concentrations of carbon nanotube, graphene nanoplates, and combinations of graphene nanoplates and carbon nanotubes. The concrete specimens were prepared both with and without the ultrasonication dispersion method to differentiate between the properties of lightweight concrete. The results indicate that the compressive strength of lightweight concrete samples was slightly increased by the incorporation of carbon nanotubes and graphene nanoplates. The utilization of the ultrasonication energy method was found to be more effective to improve the mechanical performance of lightweight concrete than the composite specimen prepared without the ultrasonication energy method. The composite specimens prepared with carbon nanotubes shows higher improvement in compressive strength than the concrete specimen prepared with the same concentration of graphene nanoplates. While the maximum improvement in compressive strength was noticed for the composite samples prepared with the combination of carbon nanotubes and graphene nanoplates.
Sustainability, Oct 12, 2020
Excellent mechanical properties and chemical stability make carbon nanotubes (CNTs) some of the m... more Excellent mechanical properties and chemical stability make carbon nanotubes (CNTs) some of the most promising nanomaterials that can be used in cementitious composites to improve their performance. However, the difficulty of CNTs' dispersion within the cementitious structure still exists and thus prevents the homogeneous distribution of CNTs. The homogeneous distribution of CNTs within a composite structure plays an essential role that can have a positive effect on the mechanical performance of CNT-cement composites. This paper introduces the methods for the production of CNTs and provides useful information about the influence of CNTs on the flowability, mechanical performance, microstructural changes and hydration of cement composites. The influences of water-cement ratio, used surfactants and various doses of CNTs on the properties of cementitious composites were also studied.
Mokslo ir technikos raida, Oct 17, 2012
Anotacíja. Straipsnis skirtas jzymaus geodezininko, mokslininko, pedagogo, Geodezijos katedros ve... more Anotacíja. Straipsnis skirtas jzymaus geodezininko, mokslininko, pedagogo, Geodezijos katedros vedéjo Izidoriaus Liesio HO-oms gimimo metinéms paminéti. Sio jubiliejaus proga Kauno technologijos universiteto Statybos ir architektüros fakultete, kuris tiesiogiai siejasi su Geodezijos katedra, buvo parengtas informatyvus stendas, atspindintis I. Liesio gyvenimo mokslinç ir pedagoginç veiklq. Siam jubihejui skirtame susirinkime perskaitytas praneSimas. Straipsnyje pateikiami bendradarbiq prisiminimai ir L Liesio atsiminimai apie pirmosios Lietuvos nepriklausomybés kürimosi laikotarpj, jo pastangas siekiant issilavinimo, tarnyb^ Lietuvos kariuomenéje. Pazymétas jo indélis i Lietuvos karo topografijos vadovybés koordinuojamus darbus, susijusius su geodeziniais matavimais Lietuvos teritorijoje. Pateikti asmeniniai prisiminimai, susijç su dalyvavimu miärios Lietuvos ir SSRS komisijos sudétyje valstybinei sienai, 1939 m. gr^zinus dalj Vilniaus kraäto Lietuvai, pa-zjTnéti, taip pat darb^ Antrojo pasaulinio karo isvakarése ir fasistinei Vokietijai okupavus Lietuv^, pedagoginç veikl^ Vytauto Didziojo universitete ir pokarines negandas, mokslinç bei pedagoginç veikl^ Kauno politechnikos institute. Reikstniniai zodziai: Izidorius Liesis, prisiminimai, geodeziniai matavimai, Valstybinè komislja sienai nustatyü, NKVD filtravimo lageris, moksliné veikla, pedagoginé veikla. {vadas Izidorius Liesis-prieskario Lietuvos karininkas, geodezininkas, aktyvus aukq rinkimo Lietuvos gynimo fondui dalyvis. Didelémis pastangomis sieké issilavinimo: jo pastangos ir gabumai nelieka nepastebéti-jis, kaip labai gabus jaunuolis, Lietuvos vyriausybés lésomis siunciamas \ Parj^iq, j Prancüzijos armijos Geografijos tarnybq studijuoti geodezijos ir astronomijos mokslq. Uzbaigçs studijas, sugrjzta tévjmén ir Lietuvos karo topografijos zinybos sudétyje atlieka labai reiksmingus geodezinius darbus. 1939 m., grqzinus dalj Vilniaus krasto Lietuvai, 1. Liesis buvo paskirtas \ Lietuvos ir SSRS komisijq valstybinei sienai nustatj^i ir asmeniskai dalyvauti pazjnmint jq vletoje. Aneksavus Lietuvq, jis, kaip Lietuvos karininkas, turintis kapitono laipsnj, automatiskai pateko Raudonosios armijos zinion, t. y. tapo jos karininku ir toliau tçsé iki toi vykdytus geodezinius matavimus. Kilus SSRS ir Vokietijos karui, L Liesis nesitraukia su besitraukiancia SSRS kariuomene, o grjzta \ Kaunq ir Jsidarbina Kauno Vytauto Didziojo universitete, Statybos fakulteto http://www.est.vgtu.it
Chemical Industry & Chemical Engineering Quarterly, 2016
Article Highlights • The zeolitization of expanded perlite was carried out to improve its hydraul... more Article Highlights • The zeolitization of expanded perlite was carried out to improve its hydraulic properties • During perlite zeolitization hydrosodalite form accelerating the hydration of cement • It significantly improves cementitious binder adhesion with zeolitized perlite particles
Journal of Sustainable Architecture and Civil Engineering, Dec 23, 2014
Various properties of self-compacting concrete (SCC) and fresh mixture attracts the researchers a... more Various properties of self-compacting concrete (SCC) and fresh mixture attracts the researchers and civil engineers' interest. It has been achieved a lot since its first introduction in 1980 in Japan. SCC virtually replaced the conventional vibrated concrete, and in many countries it started developing the SCC culture of construction technology. Currently, researchers are actively searching for new local secondary raw materials to be used as micro fillers. SCC mechanical and technological properties are being improved by incorporating partially oriented dispersive reinforcement. In this paper, influence of two waste materials: fly ash and synthetic zeolite, obtained from oil cracking process-on self-compacting fiber reinforced concrete (SCFRC) rheology and mechanical properties are compared while cement is partly replaced (10-30%) by those waste materials. Possibility of replacing the fly ash additive, which is quite widely used in the region, by zeolitic waste, obtained from oil cracking process, is analysed in this paper. Slump flow, t 500 slump flow duration, J-ring tests are analysed. In addition, results of cement paste and hardened cement paste comparative research, X-ray analysis, shrinkage strain and mechanical properties are presented. Studies show that selected additives classified as secondary raw materials have the capacity of modifying mixture plastic viscosity and yield stress values which are extremely significant properties for concrete workability in heavy reinforced structures, as well as for fiber orientation factor.
Journal of Applied Engineering Sciences, May 1, 2019
This paper deals with the behaviour of cement paste upon the addition of crushed polystyrene foam... more This paper deals with the behaviour of cement paste upon the addition of crushed polystyrene foam. Crushed polystyrene foam waste with a fill density of 13.97 kg/m 3 and hydrated lime were used to prepare the foam. Three different types of samples S-1, S-2, and S-3 were prepared to observe the behaviour of cement pastes after the addition of different doses of foam in constant water/cement ratio. The volumetric ratio of EPS and cement paste were 1: 1.294; 1: 0.863; and 1: 0.647. In each type of sample, 0.28 water/cement ratio is maintained. Slump test was carried out in the fresh state and it has been found slump value was decreasing by increasing foam content in concrete sample. On the 7 th and 28 th day of curing process, the compressive strength test was carried out. Compressive strength and density of concrete samples also decreasing by addition of higher foam content. In addition, water absorption test and microscopic analysis tests were carried out on the 28 th day of curing process. It has been found from the study that samples thermal conductivity is working proportionally.
Journal of building engineering, Oct 1, 2022
IOP conference series, Nov 27, 2018
In the article possibility to utilize granite dust in production of ultra-light weight concrete (... more In the article possibility to utilize granite dust in production of ultra-light weight concrete (≤800 kg/m3) is researched. Granite dust is a by-product of crushed granite, has very fine particles and high surface area. Due to very fine particles and high surface area, applicability of granite dust in concrete is limited. Mainly because granite dust increases W/C ratios and thus mechanical and durability properties tends to decrease. Ultra-light weight concrete, usually has very high W/C ratios, therefore in this type of concrete utilization of granite dust has favourable opportunity. In the research ultra-light weight concrete based on aluminium powder was created. Main mechanical and microstructure properties were researched and thermal conductivity coefficient was calculated. During experiment ultra-light weight concrete with 700 kg/m3 and up to 3.33 MPa was created. According to the experiment results, waste of granite dust can be properly utilised in production of ultra-light weight concrete blocks suited for one or two storages individual houses.
Materials Today: Proceedings, 2020
Abstract Expanded glass aggregate and aerogel is a very lightweight material and has excellent th... more Abstract Expanded glass aggregate and aerogel is a very lightweight material and has excellent thermal insulating properties, which can be used to produce lightweight thermal insulating cement-based composites. Herewith, two different series of lightweight concrete samples were prepared by using different sizes expanded glass aggregates and silica aerogel. In the first series, the concrete was prepared by using individual and combinations of different sizes of expanded glass aggregates with 787.5 kg/m3 binding material volume. The second series of concrete samples were prepared by individual and combinations of smaller size expanded glass aggregates with 500 kg/m3 binding material volume to understand the influence of binding materials volume in the lightweight concrete. In addition, a partial amount of expanded glass arrogates was replaced by aerogel particles and aerogel powder to investigate the influence of aerogel particles/powder on the properties of lightweight concrete. The result shows the compressive strength and flowability of lightweight concrete greatly influenced by the aggregate size and its properties. Smaller size aggregate has a higher specific surface area which increases the water demand and greatly influences the flowability of concrete. A higher volume of binding material paste causes the segregations and lightweight aggregates to start floating on the top and influence the uniform distribution of lightweight aggregates in the lightweight concrete. Scanning electron microscopy shows aerogel particle is a very brittle material and has lower adhesive properties with cementitious materials.
Materials and Structures, Jul 20, 2018
The interest in potential applications produced with self-compacting fibre reinforced concrete co... more The interest in potential applications produced with self-compacting fibre reinforced concrete continues to grow, but in practice, problems associated with an uneven distribution and orientation of fibres in the concrete structure occur. It is not clear what exactly influences uneven distribution of fibres in selfcompacting concrete (SCC) mixtures, especially during the casting and how different factors influence fibre orientation. The objective of this work was to investigate how rheological properties influence the steel fibre distribution in self-compacting concrete. This work also focuses on the investigation of steel fibre spatial orientation dependence on rheological properties of SCC, while keeping other casting parameters and the proportions of mixture components constant. Mixtures with three different rheological properties were chosen based on slump flow, slump flow time t 500 and static segregation values. The steel fibre orientation, volumetric concentration and spatial distribution values were determined in separate beam sections using three different non-destructive testing methods: electromagnetic induction, image analysis and computed tomography (CT scan). The comparison of the results is presented. The results show how different rheological properties of SCC affect the steel fibre orientation and distribution for the case of beams produced with the flow-induced casting method. Keywords Fibre orientation Á Self-compacting fibre reinforced concrete (SCFRC) Á Rheological properties Á X-ray computed tomography (CT) Á Electromagnetic induction method (EMI) Á Image analysis method E. Jasiūnien_ e (&) Á V.
Research Square (Research Square), Nov 24, 2020
This study aimed to study the effect of carbon nanotubes on the properties of expanded glass and ... more This study aimed to study the effect of carbon nanotubes on the properties of expanded glass and silica aerogel based lightweight aggregate concrete. CNTs were dispersed in the polycarboxylate superplasticizer added water by ultrasonication energy for 3 minutes. Combinations of expanded glass (55%) and hydrophobic silica aerogel particles (45%) were used as lightweight aggregates. Study results show that the incorporation of MWCNTs signi cantly in uences the mechanical and microstructural performance of aerogel based lightweight concrete. Almost 41% improvement in compressive strength was gained by the addition of carbon nanotubes. SEM image of lightweight concrete shows CNTs were almost dispersed homogeneously within the concrete structure. SEM image of the composite also shows the presence of the C-S-H structure surrounding the CNTs, that con rms the cites of nanotubes for higher growth of C-S-H. Besides, agglomeration of CNTs and the presence of Ettringites observed in the transition zone between the silica aerogel and cementitious materials. Moreover, owability, water absorption, microscopy, XRD, and semi-adiabatic calorimetry results were analyzed in this study.
Baltic Journal of Road and Bridge Engineering, Mar 19, 2012
The article describes the main damages of box girder viaducts constructed in Lithuania and discus... more The article describes the main damages of box girder viaducts constructed in Lithuania and discusses the reasons for their occurrence. Several viaducts are examined in more detail with regard to their design data and experimental results. Using finite element software "Midas Civil" the distribution of the main stresses was determined in the box and reduced girders of the Pareizgupis viaduct caused by symmetrical and asymmetrical loads. The widths of flexural cracks in the Pareizgupis viaduct are analyzed evaluating the behaviour of prestressed reinforcement suffered from corrosion. The above mentioned program was used to calculate the deflection of viaduct when damage of reinforcement is estimated. The paper examines the possibility to evaluate viaduct durability using the probability methods based on the initial investigation data.
Energy and Buildings, Aug 1, 2021
Abstract With the increase in global warming, the demand for more sustainable and thermal insulat... more Abstract With the increase in global warming, the demand for more sustainable and thermal insulating cement-based lightweight composite increases. From the past few decades, researchers worldwide have carried out extensive research on lightweight concrete using various lightweight aggregates. The use of aerogel as an aggregate in lightweight concrete is the most promising building application these days. With the exceptional characteristics of thermal insulation, ultra-low density, high adsorption, high surface area, aerogel shows a remarkable behavior. Although, the poor mechanical characteristics and high cost of aerogel have negative effects on the aerogel-incorporated concrete. This article is aimed to present a complete in-depth review of aerogel incorporated cementitious materials in terms of production/synthetisation, fresh rheology and proportioning, mechanical, microstructural, and durability properties, including water absorption, capillary water absorption, fire resistance, and exposure to elevated temperature, thermal insulation properties, and economic perspectives of aerogel. Particular emphasis has been given to study the hygrothermal behavior of aerogel-based cement composites. In addition, the present investigation gives a summary of case studies that have been performed for aerogel-based cementitious products used in buildings. The study suggests the promising future of aerogel as lightweight thermal insulating composites with sufficient mechanical properties.
Journal of Civil Engineering and Management, Jun 30, 1999
Journal of Civil Engineering and Management, Jun 30, 1997
Journal of Building Engineering, 2021
Abstract To lower the carbon footprint and alleviate global warming, it is essential to reduce ce... more Abstract To lower the carbon footprint and alleviate global warming, it is essential to reduce cement consumption in concrete. In an endeavour to mitigate the problem, use of virgin cement can be curtailed by adopting pozzolanic materials as a partial substitution to cement. To address the constraint, present study investigated the properties of cement pastes blended with natural zeolite powder of size up to 50 μm as a partial replacement to cement. Owing to the presence of a greater quantity of reactive silica and alumina, zeolite has interesting aspects that relate to its pozzolanic behavior. This study presents the strength and durability behavior of zeolite blended concrete with up to 30% replacement to cement, in addition cement-hardened pastes were examined for microstructural properties. The progress of hydration of cement and consumption of portlandite was determined quantitatively by a thermal analysis test after 48 days of hardening. The results showed that use of zeolite powder delayed the hydration leading to a decrease in compressive strength up to 28 days attributed to the delay in hydration. As a pozzolan material, zeolite needs a longer hydration time and it gains strength and dense structure at later curing ages, perhaps samples can lower the porosity with curing time. Interestingly, zeolite was very effective to absorb the heavy metals, zeolite added cement paste shows significantly lower leached heavy metals than the control specimen owing to its high absorbing capacity.
Journal of Cleaner Production, 2021
Abstract: The versatile applicability of glass products has brought a drastic increase in the amo... more Abstract: The versatile applicability of glass products has brought a drastic increase in the amount of glass waste generated, urging to its proper utilization. Light-weight expanded glass is a type of sustainable artificial light-weight aggregate produced by mixing glass wastes and expansive agents under special conditions. The highly porous granules are efficient thermal insulating light-weight material primarily used to prepare light-weight concrete. Over the past few years, extensive research has been carried out to improve the physical, mechanical, and durability properties of concrete incorporated with expanded/foamed glass. This paper is aimed to present an in-depth review of expanded glass aggregate in terms of its composition, flowability, thermal insulation, physical, mechanical, and durability properties. Special emphasis has been given to study the influence of alkali-silica reactions on the behavior of expanded glass concrete, and the results were encouraging despite the presence of a high amount of reactive amorphous silica in the expanded glass. This study is a novel initiative that accumulated the findings of expanded glass aggregate for its broad acceptance and usability in construction industry giving a promising solution to circular economy and an insight to cleaner technologies. There is plenty of research showing feasibility of glass in variant fields but widened research on expanded glass aggregate has not been presented in the past.
Uploads
Papers by Zymantas Rudzionis