Thesis supervisor: Rita Nemes
Location of studies (in Hungarian): BME Építőanyagok és Magasépítés Tanszék Abbreviation of location of studies: BMEM
Description of the research topic:
Many non-destructive test methods are applicable to estimate the strength properties and the durability of building materials in construction industry practice. These methods use empirical formulae. These formulae has been used for a long time but the building materials has changed a lot in the last decades, so the knowledge of the traditional formulae have to be extended.
The most popular non-destructive methods are the surface hardness measuring methods: rebound, surface pressure, abrasion. The rebound hammer test of concrete has detailed results but does not cover the nowadays used concrete strength range. The components of materials have changed, high-tech and recycled raw materials are used. There are no models which consider these cases. Nowadays used formulae were developed based on experiments in laboratory environment, but these methods are used in situ, in different environments (temperature, humidity). This is particularly true for surface hardness measurment.
The in situ methods for metal strength estimation use simplified calculations. The results of more parallel standard methods are not harmonized. The methods can be modelled with numerical programs as well.
The non-destructive estimation methods used in modern practice have to be updated by laboratory tests on modern materials and to cover the range used in today’s construction practice for various structural materials by the usage of mathematical and informatical background in the evaluation.
Research methodology:
Carrying out the strength and non-destructive tests typical for normal concretes, ceramics, and stones under different temperature conditions. Extending them by testing concretes with different components and at different ages.
Carrying out strength and non-destructive tests of metals used in construction practice (mainly various steel alloys) at different temperatures.
The main steps of the research program are:
- literature review of the formulae and background of currently used methods,
- effect of temperature on tests in case of different materials,
- grouping of new components of concrete based on the first test series,
- test of special concretes depending on different component,
- proposing the method of calculation,
- creation of a numerical model based on tests, proposal on strength estimation.
Number of students who can be accepted: 1
Deadline for application: 2022-05-30
2024. IV. 17. ODT ülés Az ODT következő ülésére 2024. június 14-én, pénteken 10.00 órakor kerül sor a Semmelweis Egyetem Szenátusi termében (Bp. Üllői út 26. I. emelet).
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