Katalin Kopecskó

Katalin Kopecskó
Budapest University of Technology and Economics · Department of Geotechnics and Engineering Geology

MSc, PhD

About

83
Publications
24,142
Reads
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228
Citations
Citations since 2016
54 Research Items
202 Citations
20162017201820192020202120220102030405060
20162017201820192020202120220102030405060
20162017201820192020202120220102030405060
20162017201820192020202120220102030405060
Additional affiliations
September 1997 - March 2022
Budapest University of Technology and Economics
Position
  • Professor (Associate)
Description
  • Teaching: BSc course - Chemistry for Civil Engineers; MSc course - Material Science for Civil Engineers; Environmental Geochemistry; Diagnostics of Historical Building Stones; PhD course - Relationship between BEHAVIOUR and STRUCTURE of Concrete; Durability of Construction Materials.
Education
September 1980 - June 1990
Budapest University of Technology and Economics
Field of study
  • Degree in Chemical Engineering MSc; Postgraduate degree in Concrete Technology

Publications

Publications (83)
Article
Full-text available
Liquid scintillation spectroscopy (LSC) is a widely used laboratory method for measuring radioactive especially low-energy alpha and beta emitter isotopes in solutions. Since the scintillation cocktails (SCs) contain large amounts of aromatic hydrocarbon compounds after the LSC measurement, the sample usually becomes organic radioactive waste, whic...
Conference Paper
Full-text available
Geopolymer concrete can be a solution in the future as a sustainable green construction material due to its low carbon footprint. Therefore, it is vital to understand its durability in a severe environment such as chloride exposure. The related data are collected from the peer-reviewed literature and analysed for the binding capacity of chloride io...
Article
Full-text available
The corrosion of the nuclear-borosilicate matrix in an anaerobic environment is delayed due to the formation of an amorphous gel layer on its glassy interface. The formation of this gel occurs at the saturation of silicic acid. In addition to the in-situ formed iron corrosion products, the metamorphic forms can also delay the gel formation, acceler...
Poster
Full-text available
The corrosion of the nuclear borosilicate glass matrix (R7T7 type glass) in anaerobic conditions deep in the geological repository formation is well anticipated due to the delay in the production of an amorphous protective layer (gel) on the glass interface. The role of anhydrous carbonate minerals in silica sorption is investigated and compared ex...
Conference Paper
Full-text available
For the treatment of low and intermediate level radioactive wastes generated at the Nuclear Power Plant of Paks, a new compact waste package will be created with a new cementation technology currently under construction. During the operation, the solid waste will be placed in steel drums, which then will be put into a thin-walled steel container. T...
Article
Full-text available
In our study, the influence of different supplementary cementitious materials (SCMs) such as metakaolins, silica fume (microsilica) or filtered coal fly ash on the performance of concrete is discussed. The effects of different types and dosages of the SCMs have been investigated. Centrilit NC (MK1) and Metaver N (mk2) type metakaolins, Microsit ® 2...
Article
Full-text available
Utilizing industrial waste materials such as red mud as alternatives to high emissions of CO 2 materials such as Portland cement will help to produce integrated sustainable construction materials. Statistical analysis has been performed on the major oxides of red mud to understand the relationship between chemical composition and properties (e.g.,...
Article
In the last few years, the integration of graphene oxide (GO) into the cementitious matrix has evolved as one of the most well-known inclusion of nanomaterials. The paper addresses the advancement of GO research including the microstructure modifications of GO-modified cement-based materials. The effects of GO were evaluated based on the results of...
Article
Full-text available
Currently, borosilicate glasses are utilised to immobilise highly radioactive waste. They are durable materials; however, they corrode in aqueous solutions, resulting in silica-rich alteration layers. This study employed the nuclear waste leaching tests (MCC-1, MCC-3) on International Simple Glass (ISG) samples. The corrosion rate in pure water and...
Article
Full-text available
A cementkötésű anyagok egyik legfontosabb paramétere a kötési idő kezdete (initial setting time, IST) és vége (final setting time, FST). Ezeknek az adatoknak az ismeretében lehet tervezni a vizsgált keverék bedolgozhatóságának maximális idejét (IST), ill. megbecsülhető a szilárdulás kezdeti időpontja (FST). A cementet alkotó klinker ásványok (alit,...
Article
Full-text available
Despite the unremitting efforts to model the modulus of elasticity of low-calcium-based geopolymer concrete, the state-of-the-art models need much improvement to reduce the error signals and increase the reliability. This study represents a comprehensive regression analysis to model the modulus of elasticity of low-calcium-based geopolymer concrete...
Poster
Full-text available
This poster is a presentation of Solidification of Liquid Scintillation Cocktail Waste titled extended abstract at NUWCEM 2022 conference.
Conference Paper
Full-text available
Liquid scintillation spectroscopy (LSC) is a widely used laboratory method for measuring radioactive especially low-energy alpha and beta emitter isotopes in radioactive solutions. During the measurement, the so-called scintillation cocktail is added, so the isotopes to be measured are mixed with the scintillator material. The radioactive particles...
Article
Full-text available
This article presents a regression tool for predicting the compressive strength of fly ash (FA) geopolymer concrete based on a process of optimising the Matlab code of a feedforward layered neural network (FLNN). From the literature, 189 samples of different FA geopolymer concrete mix-designs were collected and analysed according to ten input varia...
Chapter
Full-text available
One of the most critical properties of cementitious materials is the initial (IST) and final (FST) setting time, which helps to plan the transportability, workability and demoulding of concrete over time. The standards used to determine the setting time are based on measurement of penetration resistance; these are measured of the depth of penetrati...
Article
Full-text available
In recent years, the incorporation of nanoparticles in the cementitious matrix has been regarded as a prominent strategy in the research effort. This paper reviews the influences of the nanomaterial GO (graphene oxide) in cement bound materials, as GO has become one of the most well-known inclusion nanoparticles in the cementitious matrix in the la...
Conference Paper
The aim of this study was to examine the influence of flax fibre protection with the linseed oil and a matrix modification with cement substitution with metakaolin (in 10wt% and 15wt%) on the mechanical properties of cement-based mortars under severe environmental conditions of freeze/thaw cycles. Cement-based mortars (with the dimension of 40x40x1...
Article
Full-text available
Contact with groundwater in the disposal geological site will induce the creation of an amorphous corrosion layer on the high-level radioactive glass. This is connected to silicate saturation conditions in the surrounding medium, and it is influenced significantly by geochemical processes in the near-field minerals at that depth. The international...
Article
Full-text available
For the treatment of low and intermediate level radioactive waste generated at the Nuclear Power Plant of Paks, a new compact waste package will be created with a new cementing technology currently under construction. During the operation the solid waste will be placed in steel drums than these drums will be placed into a thin-walled steel containe...
Conference Paper
Full-text available
Alkali-activated binders, including "geopolymers," have attracted great interest in recent decades in both the scientific and industrial worlds. These materials can be prepared by alkaline activation of solid alumino-silicates, which are generally available as industrial by-products. The activator can be a concentrated aqueous solution of alkali hy...
Chapter
Full-text available
In this study, the vitrified High-Level Radioactive Waste (HLW) disposal was simulated using a simplified version of the French R7T7 reference glass, called International Simple Glass (ISG). Test for nuclear waste form (MCC-1) was assembled for (3-90 days) using coupon samples of ISG and powdered Ankerite. Set-up systems were conducted using ultrap...
Article
Full-text available
The effect of geological deposition conditions on the durability of glass used for radioactive waste disposal is investigated in this study. Iron mineral compositions or other near-field parameters within the final disposal repository may influence the durability of highly radioactive glass. The experimental study of silicate sorption by natural An...
Article
Full-text available
The research aims to determine the best combination of the controlling factors that govern geopolymer concrete’s mechanical and physical properties by utilizing industrial waste. Therefore, a review on the controlling factors was conducted. Firstly, it is to identify the controlling factors, namely chemical composition, alkali activation solution,...
Chapter
Full-text available
ÖSSZEFOGLALÁS Konzorciumi kutatócsoportunk olyan fejlesztési területeken vállalt közös erőfeszítéseket, amelyek a környezetünket jelentősen meghatározó vasbetonszerkezetek biztonságosabb és hosszabb élettartamú használatára nyújtanak lehetőséget, erőforrásaink hatékonyabb kihasználása mellett. Törekvéseink elsődleges célja olyan betonösszetételek k...
Article
Full-text available
The supplementary cementitious materials (SCMs) have recognized many of the beneficial influences on concrete ability to resist the penetration of chloride ions, such as fly ash, slag, silica fume, metakaolin, and other natural pozzolans; this benefit has primarily been ascribed to the refined pore structure that results from the appropriate use of...
Preprint
Abstract - The 16th Miklós Iványi PhD & DLA Symposium: 26th-27th October, 2020 https://issuu.com/pivanyi/docs/book_of_abstract_2020
Conference Paper
Full-text available
IN ENGLISH: On October 4, 2010, the red mud storage barrier X. of the Ajkai Alumina Factory of MAL Hungarian Aluminium Production and Trade Company. Hundreds of thousands of cubic meters of alkaline red mud flooded the closest village, Kolontár, then, moving on in the valley of the Torna stream, flooded the villages that got in its way. In order to...
Article
Full-text available
The most flame retardants and non-combustible non-woven fabrics are made of oxidized and carbon fibres due to their strong thermal stability. The burning of non-woven fabrics consists of complex combustion mechanisms: their surface, micro and macrostructures together define their combustion features. By microstructure, we mean oxidized polyacrylicn...
Article
Full-text available
A 3D nyomtatás a megjelenésétől fogva az érdeklődés középpontjában van. A technológia fejlődésén és sikeres alkalmazásain keresztül életünk részévé vált a legkülönbözőbb területeken. A folyamatok összetettsége révén a betonnyomtatás van talán a többi területhez képest (műanyagnyomtatás és fémnyomtatás) leginkább lemaradva. Szándékunk ezért részlete...
Article
Full-text available
Iron corrosion products of the steel canister in the nuclear waste container are highly silica sorptive materials and very much expected to delay formation of the protective layer (gel) on the nuclear glass interface. This study is focusing on the role of the iron carbonates (ankerite), which is probably one of iron corrosion products and already e...
Poster
Full-text available
The present experimental work is representative to the potential impact of geological deposition conditions on durability of glass used for radioactive waste disposal which could be influenced by iron mineral compositions or other parameters. Natural ankerite/dolomite (CaFe(CO 3) 2) and master silicate solution contain partially dissolute silica ge...
Conference Paper
Full-text available
Purpose of study of internal structure of materials – both with optical microscopy and scanning electron microscopy – is to find explanations for stress and deformation properties as well as cracking in the material based on internal properties, bond and interaction of components. Scanning electron mi-croscopy provides observations for both in micr...
Article
Iron corrosion products of the steel canister in the nuclear waste container are highly silica sorptive materials and very much expected to delay formation of the protective layer (gel) on the nuclear glass interface. This study is focusing on the role of the iron carbonates (ankerite), which is probably one of iron corrosion products and already e...
Article
Full-text available
Iron corrosion products of the steel canister in the nuclear waste container are highly silica sorptive materials and very much expected to delay formation of the protective layer (gel) on the nuclear glass interface. This study is focusing on the role of the iron carbonates (ankerite), which is probably one of iron corrosion products and already e...
Article
Full-text available
A megszilárdult betonnal, betontermékkel, vasbeton és feszített vasbeton szerkezeti elemmel érintkező lágyvizek és agresszív vizek, folyadékok, gázok, gőzök, permetek, erjedő anyagok a cement kötőanyagú betonok oldódásos korrózióját okozhatják. Cikksorozatunknak e folyóirat 2017. évi 3. számában megjelent 1. részében (Balázs et al., 2017) a vizek é...
Article
Full-text available
The aim of the research was to design powder type self-compacting concrete containing high amount of limestone quarry waste as aggregate and fines. The light colour aggregate mixed with white cement resulted in esthetical surfaces of exposed concrete for architectural purposes. Large amount waste originated from the limestone mining process require...
Conference Paper
Full-text available
Future experimental work is planned to be conducted on samples of the French reference glass SON68 including glass quickened ageing to figure out the helpful and ideal conditions of the greatest Si sorption by iron corrosion products experimentally added to the leaching environment. Ankerite is anticipated to show recognizable Si sorption activitie...
Chapter
Full-text available
Composition and microstructure of hardened cement paste have important influences on the properties of concrete exposed to high temperatures. An extensive experimental study was carried out to analyse the post-heating characteristics of concretes subjected to temperatures up to 800 °C. Major parameters of our study were the content of supplementary...
Article
Full-text available
The increasing numbers of used tyres constitute a serious threat to the natural environment. The progress made in recent years in the management of polymer wastes has meant that used tyres are starting to be perceived as a potential source of valuable raw materials. The objective of this research was to study the burning characteristics of various...
Chapter
Full-text available
An extensive experimental study has been carried out to analyse the post-heating characteristics of concrete subjected to high temperatures up to 800 °C. Major parameters of our study were the type and amount of supplementary cementitious materials (slag, fly ash, trass, silica fume, metakaolin) in cements and the level of maximum temperature (50,...
Conference Paper
Full-text available
Iron corrosion products of the steel canister in the nuclear waste container are highly silica sorptive materials and very much expected to delay formation of the protective layer (gel) on the nuclear glass interface. This study is focusing on the role of the iron carbonates (ankerite), which is probably one of iron corrosion products and already e...
Article
Full-text available
Durability and service life of concrete structures can be endangered by chloride ions. Two phenomena help to keep control of chloride effects. On one hand cements are able to bind chloride ions by their aluminate clinker phases or by the clinker substituting materials. On the other hand resistivity of concrete against chloride penetration can be im...
Article
Full-text available
Our study was directed to the analysis of the influence of various types of cements on the behaviour of concrete at high temperatures. In our experiments binary blended and ordinary Portland cements were involved: two Portland cements with different clinker compositions and Portland cements containing pozzolanic additives as replacement of clinkers...
Article
Full-text available
Natural fibre reinforced cementitious composites have been recently considered as a viable replacement of highly resource- and energy-intensive traditional (steel- and synthetic) fibre reinforced composites. However, the major obstacle in their larger scale application remains the lack of long term durability of the natural fibres in the high alkal...
Article
Full-text available
Az utóbbi évtizedekben számos épületkatasztrófa igazolta, hogy a tűzteherre való méretezés kérdései továbbra is aktuálisak. A különböző hőmérsékleti tartományokban a betonban lejátszódó legfontosabb fizikai és kémiai folyamatok jelentősen befolyásolják a beton magas hőmérséklet hatására kialakuló anyagtulajdonságait. A beton tűzterhelés hatására be...
Conference Paper
Full-text available
Composition and microstructure of hardened cement paste have important influences on the properties of concrete exposed to high temperatures. An extensive experimental study was carried out to analyse the post-heating characteristics of concretes subjected to temperatures up to 800 °C. Major parameters of our study were the content of supplementary...
Article
Full-text available
Concrete is a composite material that mainly consists of mineral aggregates bound by the matrix of hardened cement paste. Composition and microstructure of hardened cement paste have important influences on the properties of concrete exposed to high temperatures. An extensive experimental study was carried out to analyse the post-heating characteri...
Article
Full-text available
In the hardened cement paste – through pozzolanic reactions – additional hydration products can be formed by the use of supplementary cementing materials (SCM s). The expected results of these processes are: increase in strength, decrease in permeability and the improvement of other important durability properties. In the present research, properti...
Article
Full-text available
When it comes to flood protection, the established method is to use an impermeable material in dikes, to prevent seepage. This material is usually some type of clayey soil which is considered as watertight and erosion-resistant. Despite that, in many occasions not only seepage, but the failure of the dam occurred due to surface erosion, because dis...
Article
Full-text available
The improvement of the durability of cement-based materials (mainly mortar and concrete) is a very significant task, because these are the most frequently used building materials. Unfortunately, the environmental effects (acidic rain, chloride ions, sulphate ions, fermentation reactions, etc.) can cause damages on these structures. The (combined) a...
Conference Paper
Favourable experiences with fibre reinforced concrete (FRC) resulted in its increasing use worldwide. Most of the natural fibres have relatively high tensile strength, however, their long term alkaline resistance should be also provided. Present study was directed to measurements on the hemp fibres with two different coatings as well as on concrete...
Conference Paper
The aim of the research was to design powder type self-compacting concrete containing high amount of limestone quarry waste as aggregate and fines. The light colour aggregate mixed with white cement resulted in esthetical surfaces of exposed concrete for architectural purposes. Large amount waste originated from the limestone mining process require...
Article
Full-text available
Ordinary Portland cements consist of clinker minerals and about 5 m% sulphate bearing constituent, mainly gypsum. The hydration products of aluminate clinker minerals (C3A and C4AF) are able to bind chloride ions originating either from inner or outer source (seewater or deicing salt). The chemically bound chloride content does not induce corrosion...
Article
The aim of this paper is to introduce the horizontal sorption technique and to demonstrate its applicability for the observation of porous materials and effect of surface treatments. The horizontal sorption testing method is a new technique, which was developed to facilitate the in-situ assessment of water absorption properties of porous materials....
Article
Full-text available
In the present paper migration characteristics of Bacillus cereus in porous limestone, as well as capillary absorption and elevation properties of porous limestone were analyzed. For the measurements two newly designed measuring methods were used: a combined capillary absorption capillary elevation test, and printing-on-agar technique of treated sp...
Article
Full-text available
Nowadays the most suitable and widely used construction material is concrete. We could develop concrete for every request in connection with the properties of fresh concrete and the quality of hardened concrete, too. The demand is rising in application of special concretes, like high performance and ultra high performance concretes (HPC, UHPC). The...
Article
Full-text available
Bacteria induced calcium carbonate precipitation nowadays is a widely examined process being a possible alternative for traditional stone conservation methods. While research has been mostly limited to laboratory measurements, application connected, further in situ experiments should be performed in order to evaluate the applicability of the method...
Article
Full-text available
Absorption and transport of water in porous stone materials is an important issue, since it is often related to the durability and deterioration of the material. Traditional standardized tests are aimed to determine the rate of absorption or water-permeability by measuring the weight or volume of absorbed water through a given surface area with tim...
Article
Development of biomineralizing techniques requires new or borrowed methods, as well as instruments for the evaluation of the efficacy of the biomineralization. The aim of the research was to evaluate the appropriateness of two existing techniques for measuring the surface hardness and material loss of microbially treated porous limestone surfaces....
Article
Full-text available
Low water levels of the Danube during the late autumn of 2011 exposed rocks in the riverbed along the Gellért Hill (Budapest, Hungary). In contrary to common belief, these rocks, called the Ínség-kő, are not Triassic dolomites, but silicified Eocene sandstones. Similar formations are known from the Gellért Hill. The significant secondary porosity o...
Article
Full-text available
Porous materials are widely used for construction purposes. While they are often exposed to environmen- tal impacts, their deterioration and decay is unavoidable in a longer period of time. Therefore protection of porous materials, such as concrete, brick and stone, is necessary. Bacteria induced calcium carbonate precipitation nowadays is a wide...
Conference Paper
Full-text available
A tartósság egyik legfontosabb kérdése ma az, hogyan tudjuk megvédeni szerkezeteinket attól, hogy a kloridionok eljussanak az acélbetétekig, illetve, hogy ott az aktív korrózió elkezdődjön. Az acélbetétek takarásának növelése tűnhet az egyik lehetséges megoldásnak. Ez a megoldás azonban nem bizonyulhat optimálisnak, mert a szerkezetek tömege lényeg...
Conference Paper
This paper deals with our test results on hardened and afterwards salt-treated cements modelling the influence of de-icing salt. Hydration both of naturally hardened and steam-cured cements were investigated as well as their chloride ion binding mechanisms by thermal tests and X-ray diffraction. The series of samples were cements with different amo...
Conference Paper
Full-text available
Magyarországon nagy hányadban találkozunk magmás eredetű tufa műemlékekkel, amelyek pusztulása a hazai műemlékvédelem jelenleg is fontos kérdése. Szakszerű műtárgyhelyreállítást és megóvást csupán alapos állapotfelmérés és ismeretanyag birtokában végezhetünk. A kutatás kitűzött célja, hogy a nemzetközi és hazai tapasztalatok figyelembe vételével rá...
Article
Full-text available
Freeze-thaw testing methods with different grade of severity have been applied to investigate the durability of – intentionally non air entrained – fibre reinforced concretes (FRC) mixed with nominally zero, 25, 50 and 75 kg/m3cold drawn steel fibres (30/0.5 mm). Concrete specimens were made with sulphate resistant Portland cement and were stored 2...
Conference Paper
Full-text available
Main purpose of our research was to study both the hydration and chloride ion binding mechanisms of slag cements. This paper deals with our test results on hardened and afterwards salt-treated cements modelling the influence of de-icing salt. Hydration both of naturally hardened and steam-cured cements were investigated as well as their chloride io...
Article
Full-text available
Hydration of steam-cured C3A and C4AF cement clinkers and their mixtures with gypsum (up to 10/5 mass ratio) were investigated as well as their chloride ion binding capacity by thermal tests (TG/DTG/DTA) and X-ray diffraction (XRD). The other series of samples were made of cements (OPC, GGBSC and SRPC). The hardened samples were cyclically immersed...