About
28
Publications
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Introduction
Probably - out of many things - the hardest one is when one has to write about himself.
I finished secondary school in Nigeria, Lagos at St' Greg's in 1976. Afterward returned to Hungary, and studied to become a civil engineer and obtained an MSc degree in 1983. I am working since, at first in the field of design, then as a contractor, project manager, independent engineer and finally in the tertiary education and research. During all these times I carried out part-time private practices as a designer and as an expert.
Additional affiliations
September 2006 - present
Position
- Assistant Professor (adjunct)
Description
- Apart from others, the main fields are: concrete, binders, thermal insulating and waterproofing materials, construction technologies.
September 2006 - present
Education
March 2000 - December 2005
September 1978 - June 1983
Publications
Publications (28)
The new concrete standards give directives regarding the checking if the hardened concrete conforms to the compressive strength requirements of the designed compressive strength class. The acceptance or rejection of conformity is the function of the compressive strength testing methods and the evaluation of the test results. In the paper through ex...
The grading of concrete aggregates (sands, sandy gravels, crushed stones, stone dusts etc.) numerically the particle size distribution is characterised namely by the mean value, the standard deviation, the variation coefficient, the average particle size, the fineness modulus and the specific surface area (by volume). The article introduces a unite...
The Hungarian Group of fib developed a Technical Guideline for concretes by using crushed bricks or crushed concrete. Crushed concrete can originate from demolishing or from prefabrication. This paper presents the main parts of the Technical Guideline including classification of crushed recycling aggregates and procedure of preparing the concrete w...
Energy efficient buildings are unimaginable without highly insulating thermal envelopes. Mineral wool among others is a popular material for thermal insulation. Architects and engineers usually use the data given by the manufacturer in the specification of the material for their building physical design. Such data are obtained from laboratory measu...
The paper analyses the monitoring measurement results on energy performance and hygrothermal behaviour of built-in rock and glass mineral wool thermal insulations in an energy efficiently refurbished typical single-family dwelling house in Hungary. The experimental monitoring measurements included an external weather station; internal air condition...
In this paper the authors present the possibility to utilize two waste materials to produce high performance concrete (HPC). To prepare the mixes, Recycled Concrete Aggregate (RCA) of 4-16 mm fraction and Class F fly ash (from coal burning power plant) were used. Concretes with RCA were mixed with 300 kg/m3 of different types of cements and Supplem...
In the article the possibility of using a surface blast-cleaning waste as a replacement of fine aggregate in concrete manufacturing was presented. Concretes with w/c ratio 0.6 and 300 kg/m3 dosage of cements: CEMI 32.5R and CEMII/B-V 32.5N were tested. The quite high value of the w/c ratio resulted in good compactibility of the mixtures without use...
When determining the characteristic compressive strength of any concrete with given composition from its mean compressive strength according to the European product standards (EN 206:2013) compressive strength conformity criteria, there is a big likelihood of that the compressive strength class will come out to be at least one class higher. That is...
The porosity, water absorbing capability, internal load bearing system of light weight aggregate concretes differ from ordinary concrete
In case of structural concretes there is often a demand of non-destructive testing, but between the available, connected modifying parameters there are none which are suitable for the special case of light weight...
A két világháború között épített, béléstestes monolit vasbeton födémek esetén várható, hogy a közeljövőben meghibásodásokat tapasztalunk rajtuk. Két esettanulmány kapcsán - melyek mondhatni, gyorsított korróziós vizsgálatnak tekinthetők - szertnéánk segítséget nyújtani azon szakembereknek, akik a jövőben hasonló jelenségekkel találkozhatnak tevéken...
Az „öreg” és a friss beton együttdolgozása régóta foglalkoztatja a mérnöktársadalmat. Néhány éve a BME Építőanyagok és Mérnökgeológia Tanszékén ilyen irányú kísérletek kezdődtek, melyek még napjainkban is folynak. A VASBETONÉPÍTÉS 2001. évi 3. szám 75-83. old. megjelent „PROFIPANEL” című, Polgár László és Stairits Ferenc szerzők által írt szakcikké...
During the refurbishment of a large area of a low-pitched roof with mineral wool, the
rigid boards have lost their compressive strength and could not be used. This was surprising
because the material was protected from the weather by the damp-proofing
layer and did not get wet. This article deals with the investigation of the possible causes.
The paper is intended to deal with a certain failure of a floor slab type, which was favored in the beginning of the 20th century in Hungary. The main features are: between skeleton ceramic filling elements in situ reinforced concrete beams are prepared during the construction of the relatively narrowly spaced RC beamed slabs. In the studied cases...
The determination of the corrosion risk of embedded steel in a non-destructive way is a common necessity. The corrosion risk significantly depends on the different harmful materials and their accession into the concrete. The higher the concrete porosity is, the easier for these corrosive materials to get near to the embedded steel, consequently the...
It is known that the friction between the loading plate and the test specimen influences both
the shape of the failure and the measurable compressive strength during the testing of
compressive strength of concrete. Present paper studies the influences of friction on the
measurable compressive strength of concrete specimens. Standard cubes of 150 mm...
The expression „watertight concrete” may be misinterpreted several ways, it is more precise to say: the concrete mixture is suitable to prepare a watertight structure. We would like to present with this paper that the watertightness does not only depend on the mixture in the laboratory, but also on the construction circumstances, on the after-care...
A beton munkahézag két rétegének együttdolgozása illetve együttdolgoztatása sok bizonytalanságot hordoz magában. Az már korábban is bebizonyosodott, hogy a fogadó beton felületi durvaságának van erre a legjelentősebb hatása. A budapesti 4-es metró építése kapcsán végzett kutatás során, a vizsgálatot végzőkben merült fel az a kérdés, hogy milyen mér...
A STRUCTURE WHICH SUCCESSFULLY SUNK
There are structures, which are under ground level and may be located at such places which are not frequently visited so they get out of the general interest. The Gyirmót Pumping Station is typically such a structure which satisfies both. The writing of this paper is to inform a wider community about solving tw...
The new concrete standards give directives regarding the checking if the hardened concrete
conforms to the compressive strength requirements of the designed compressive strength
class. The acceptance or rejection of conformity is the function of the compressive strength
testing methods and the evaluation of the test results. In the paper through ex...
The grading of concrete aggregates (sands, sandy gravels, crushed STones, stone dusts etc.) numericaly the particle size distribution is characterised namely by the mean value, the standard deviation, the variation coefficient, the average particle size, the fineness modulus and the specific surface area (by volume). The article introduces a united...
During design, manufacturing and construction of prefabricated and in-situ reinforced concrete structures, where the concrete-to-concrete interacting capability is to be calculated, the surface roughness of the receiving concrete has major significance. It is also desirable to find relation between the surface roughness of the receiving concrete, t...
A key point is the interaction between the two concrete layers during the design and construction of horizontal load-bearing structures consisting of thin reinforced concrete elements (floorplanks) and in-situ concrete. In 1990 the Consulting Company of Prefabricated Elements (TTI) for the order of the Hungarian Ministry of Works and Housing prepar...
During design, manufacturing and construction of prelabricated and in-situ reinforced concrete structures, where the concrete-to-concrete interacting capability is to be calculaled, the surface roughness of the receiving concrete is of significance. In the regulations and guidelines the surface roughness of the receiving concrete is not quantified,...
Questions
Questions (3)
Ozone is bubbled in water, for a period of time. Concrete is mixed with this water. US patent claims, concrete has become having almost twice strength as before.
May it happen? And if yes, WHY?
Day by day I face the problem of having the middle of the food cold while the perimeter is warm. Wish to find a solution..... :-) (just removing and mixing is not a solution for me....)
