Nikoletta Rozgonyi-Boissinot

Nikoletta Rozgonyi-Boissinot
Budapest University of Technology and Economics · Department of Construction Materials and Engineering Geology

About

24
Publications
23,443
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
132
Citations

Publications

Publications (24)
Article
One of the major causes of building stone deterioration is salt crystallization. In this study, changes of ultrasonic pulse velocities of highly porous limestone (obtained from the Sóskút quarry, Hungary) during capillary water absorption, water saturation and during salt crystallization tests were investigated. Capillary water absorption and water...
Article
Water saturation is considered one of the major factors influencing stones deterioration. The effect of moisture on the deterioration process of stone was investigated with the help of ultrasonic wave velocities. P and S waves velocities were calculated for twelve different lithotypes including limestone (porous limestone, laminated and less-lamina...
Article
Full-text available
The evaluation of shear stress versus shear displacement curves is in the main focus of geotechnical engineering. Such curves, depending on the rock assessed, consist of a quasi-linear section, followed by a "kick" representing the peak shear strength, and a residual part, mostly parallel to the abscissa. The aim of the present study is to facilita...
Article
Full-text available
This study focuses on the mechanical parameters of Miocene limestones from Hungary. Four different lithotypes of porous limestone from two localities were analysed in laboratory conditions. These lithologies have been widely used for centuries as construction material in Central Europe. One type of the Badenian Leithakalk limestone, which is a bioc...
Article
Full-text available
Salt weathering is one of the crucial causes of building stone decay. For assessing the durability of stones against salt weathering, a standardised test procedure (EN 12370:2020 Determination of resistance to salt crystallisation) is used: the mass loss of the stone is measured during sodium sulphate crystallisation cycles. Porous, Miocene limesto...
Article
Full-text available
The durability of consolidated highly porous limestones was tested after salt and freeze–thaw cycles. Three porous limestone lithotypes that were commonly used in construction in the Central-European region during previous centuries were selected for the tests. Specimens of Miocene limestone were consolidated with four different types of ethyl sili...
Article
Full-text available
The effects of grain size and different multi-stage shearing techniques on shear strength along discontinuities were analyzed in this study. Laboratory direct shear tests were carried out on plaster mortar with maximum grain sizes of 0.5 mm and 1.0 mm. All specimen surfaces were essentially similar, copied from the same natural, Hungarian coarse-gr...
Conference Paper
Full-text available
The shear strength of rocks along discontinuities is one of the key parameters for the determination of rock slope stability, the stability of rocks during underground space development and tunneling. Its value is influenced by numerous factors including surface roughness, which is one of the most widely investigated discontinuity property. The pre...
Article
Full-text available
In this study, the joint shear strength of low-strength Hungarian sandstones of different grain size and surface roughness was investigated. The direct shear tests along discontinuities were performed under constant normal load. Previously, the direct shear test basic rock mechanic parameters of the investigated intact rocks were determined, such a...
Article
Full-text available
Shear strength along rock discontinuities by means of direct shear strength tests were performed on granitic and clayey rocks. Both rock types represent potential host rocks of radioactive waste. The paper focuses on the effect of one parameter in particular influencing the shear strength: the angle enclosed by the plane of the sample surface and t...
Article
Full-text available
The shear strength of rocks along discontinuities has the highest influence on rock slope stability; therefore, its accurate determination is crucial. This paper presents a potential solution for the 3D surface detection of the rock discontinuity surfaces by using photogrammetric methods (ShapeMetriX3D), from which one of the most important shear s...
Conference Paper
Full-text available
Siroki várhegyet alkotó riolittufa állékonysági vizsgálatát mutatja be a cikk, kiemelve a térinformatika és a mérnökgeológia együttes alkalmazását. A sziklalejtő felmérésére az erősen tagolt domborzat miatt és a nehéz megközelíthetőség miatt GNSS támogatású földi lézerszkennelés és drónos légifényképezést alkalmaztunk. Az így kapott térinformatikai...
Article
Full-text available
The paper summarizes the results of direct shear strength tests carried out on Opalinus Claystone deriving from a fault zone, at the site of Mont Terri (North-Western Switzerland). In Mont Terri an Underground Rock Mechanical Laboratory is conducting studies aimed at specifying the rock mechanical parameters of the rock surrounding, which is at the...
Conference Paper
Full-text available
Az agyagkövek szerepe az elmúlt 50 évben jelentősen megnövekedett az építő-iparban, a nagy aktivitású radioaktív hulladékok tárolásának kapcsolatán. Több nemzet is, köztük Ma-gyarország, Svájc, Franciaország, agyagos kőzetbe tervezik építeni a lerakót. Amennyire előnyös tulaj-donságokkal rendelkezik a kőzet a természetben, ilyen például a magas víz...
Conference Paper
Full-text available
In the past decades the long term safe storage of highly active radioactive waste has been one of the greatest challenges for engineers and scientists to be solved. It is internationally agreed that the radioactive waste should be placed into deep geo-logical formations, namely into granite, salt or clay stone. The latter type, in par-ticular the O...
Article
Full-text available
This paper presents a brief summary of the main existing shear strength test methods on both intact and fractured rocks, such as the triaxial, half-half notched specimen and direct shear strength tests. A detailed description of how to carry out a direct shear strength test on rocks along discontinuities are provided, supported by test results. The...
Conference Paper
Full-text available
The following article gives data about the direct shear strength tests of the host rocks of the Bátaapáti National Radiactive Waste Repository for low and medium active radioactive waste. The tests were carried out in Switzerland at the Laboratory for Rock Mechnanics at the École Politechnique Fédérale de Lausanne (EPFL). The paper provides data on...
Conference Paper
Full-text available
The physical properties of rocks are important input parameters for the modelling and analysis of underground structures. Various test methods are known and are standardised to determine most of the data e.g. uniaxial compression strength or tensile strength. However because of the complexity of the test influencing parameters, such as surface roug...
Article
Full-text available
This paper provides test results and interpretation of the shear strength of granitic rocks. The samples were obtained from Bátaapáti (South Hungary), where the low and medium-activity nuclear waste storage facility of Hungary is under construction. The experiments were carried out under laboratory conditions by using direct shear strength tests of...
Article
Full-text available
Black crusts are very common on limestones in polluted urban environments, but white crusts are less frequently developed. On the soft, porous and inherently weak oolitic limestone of Budapest both crusts are frequent, and indeed white ones are more common on the stone walls of the studied fortress. In this paper, black and white crusts and the hos...

Network

Cited By