Wyniki wyszukiwania - BazTech

1

Badanie wytrzymałości na rozciąganie prętów kompozytowych na bazie włókien szklanych z siatek zbrojeniowych prefabrykowanych

Rduch A., Rduch Ł., Pitas M., Kot M., Hahn T., Konopka K., Cybulski R., Walentyński R.

Przegląd Budowlany

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2018

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R. 89, nr 12

37--40

PL

Artykuł przedstawia badania prętów zbrojeniowych kompozytowych na bazie włókien szklanych na rozciąganie oraz wyniki tych badań. Pręty zostały wycięte z siatek zbrojeniowych kompozytowych prefabrykowanych produkowanych przez polskiego producenta. Na podstawie badań stwierdzono, że pręty tego typu mają wytrzymałość na rozciąganie porównywalną ze stalą klasy AIIIN i o połowę niższą od klasycznych prętów kompozytowych wytwarzanych w procesie pultruzji.

EN

The article presents tests of composite reinforcing steel bars based on glass fibres and the results of these tests. The bars were cut from prefabricated composite reinforcing grids produced by a Polish manufacturer. The tests revealed that this type of bars has a tensile strength comparable to that of AIIIN class steel and half lower than conventional composite bars produced in the pultrusion process.

2

Badanie połączeń ścian murowych

Galman I., Jasiński R., Hahn T., Konopka K.

Materiały Budowlane

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2017

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nr 10

94--96

PL

W artykule zostały przedstawione wyniki badań własnych połączeń ścian wykonanych z autoklawizowanego betonu komórkowego. Przeanalizowano morfologię zarysowań i mechanizm zniszczenia, porównano zależność obciążenie - przemieszczenie różnych typów połączeń. Uzyskane wyniki odniesiono do rezultatów otrzymanych z modelu referencyjnego z klasycznym wiązaniem murarskim. W pozostałych modelach badawczych połączenie zostało ukształtowane przy użyciu najpowszechniej stosowanych w Polsce łączników stalowych w postaci: kątowników oraz blaszek perforowanych. Wykazano różny mechanizm zarysowania i zniszczenia oraz wyraźne różnice nośności każdego typu połączenia.

EN

The paper presents original results of the tests performed on the joints of the walls made of AAC blocks. The analysis covered morphology of cracking and failure mechanism, as well as comparison of stress - strain relationship of different types of joints. The obtained results were related to the results of the reference model which was the model with classical masonry joint. In the remaining testing models the joint was made with the use of the most commonly used steel connectors in Poland applied in these joints: angle profiles and punched flat profiles. It has been shown that the joints differ in the cracking pattern and failure mechanism as well as in the load-bearing capacity.

3

Microwave-assisted phase separation of alkali-borosilicates in the production of nanoporous glasses

Kullmann J., Enke D., Hahn T., Bauerschaefer U., Ledig L., Gai S., Bochmann A.

Optica Applicata

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2012

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Vol. 42, nr 2

255-263

EN

The influence of a hybrid thermal processing on the spinodal decomposition of sodium borosilicate glasses was investigated. The pore diameter of the resulting porous glasses is a function of the parameters of the thermal treatment. One result of this study was the inversion of the phase separation under preservation of the external shape of glass monoliths. Furthermore by using microwaves in addition to thermal radiation it was possible to generate temperature gradients in the samples and so gradients in pore size too. The glass templates were heated with microwaves in a tube furnace consisting of a resonant rectangular waveguide (TE103). Additionally the tube wall was heated by thermal radiation. The heating control was realized by steering the input power and the frequency of a 200 W semiconductor source. The regulation was performed with a HOMER 3-stub tuner, which simultaneously measured the impedance by reflected wave analysis and the actual template temperature with an IR-sensor. Various temperature-time courses of the hybrid furnace led to different pore size gradients. This was discussed by analyzing specific properties like mean pore diameter, surface area and pore volume. Further effects like the pore orientation and properties of the pore walls were determined by scanning electron microscopy and focused ion beam (FIB).

4

Inverse gas chromatographic studies on porous glass

Rueckriem M., Hahn T., Enke D.

Optica Applicata

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2012

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Vol. 42, nr 2

295-306

EN

Porous glass is a well suitable system for the exploration of new characterization techniques due to adjustable texture properties and the possibility to "tailor-made" the surface chemistry. In this study porous glass beads were utilized as model system for the evaluation of inverse gas chromatography (IGC). Mesoporous glass beads with 10 and 20 nm pore size and macroporous glass beads with 50 nm pore size were synthesized and modified by thermal treatment and chemical reaction with hexamethyldisilazane (HMDS), ethyl-, propyl-, butyl- and octyldimethylchlorosilane. The correlations between the textural properties and the dispersive surface energy were investigated by means of the IGC technique. Furthermore dependences between surface chemistry and surface energy were pointed out on the basis of IGC measurements.