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Zastosowanie polimerobetonów zawierających przemysłowe denne popioły fluidalne w płytach ostojowych słupów energetycznych

Korol Jerzy, Skotniczny Grzegorz, Kozioł Mateusz, Chmielnicka Ewelina, Kowalik Magdalena

Cement Wapno Beton

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2023

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R. 28, nr 5

284--300

PL

W pracy przedstawiono metodę przygotowania, formowania i badania polimerobetonów zawierających 10 - 60% dennych popiołów paleniskowych z kotła fluidalnego [CFB] elektrowni. Resztę wypełniacza stanowił standardowy piasek kwarcowy. Przeprowadzono badania statycznego zginania i zmian masy pod wpływem kwasu, zasady i soli. Zmierzono także zmiany masy po testach zamrażania i rozmrażania. Badane polimerobetony nie wykazały żadnych problemów podczas procesów produkcyjnych. Polimerobetony zawierające 10 - 20% mas. popiołu wykazywały wyższą wytrzymałość na zginanie niż polimerobeton zawierający 100% piasku i wynosiła ona około 35 MPa. Stosunkowo niewielkie zmiany masy [poniżej 0,5% bez ekspozycji bazowej, dla której wynosiła ona mniej niż 3%] spowodowane czynnikami środowiskowymi, w zasadzie zgodne z przewidywaniami teoretycznymi, pozwalają przypuszczać, że badane materiały spełnią wymagania wytrzymałościowe stawiane płytom ostojowym. Stwierdzono, że optymalnym materiałem do produkcji płyt jest polimerobeton zawierający 10% mas. popiołu. Ze wszystkich badanych betonów wykazał najlepszą odporność na starzenie środowiskowe. Zaprojektowany system form jest prosty i niezawodny - nadaje się do seryjnej produkcji płyt w warunkach przemysłowych. Jakość wizualna produkowanych płyt jest bardzo dobra. Generalnie, polimerobeton po raz kolejny okazał się bardzo dobrym materiałem, mającym zastosowanie w różnych elementach budownictwa.

EN

The paper presents a procedure for preparing, molding, and testing polymer concrete containing 10 - 60% bottom ash from power plant fluid circulating fluidized bed boiler (CFB) - the rest of the filler was standard sand. The tests of static bending and mass changes after exposition to acid, base and salt were conducted. Additionally, mass changes after freeze-thaw tests were registered. The tested polymer concretes showed no problems during manufacturing process. Compositions containing 10 - 20% by weight of ash showed higher flexural strength than polymer concrete containing 100% sand and it was approximately 35 MPa. Relatively small changes in mass [less than 0.5% excluding base exposition for which it was less than 3%] caused by environmental factors, in general consistent with theoretical predictions, allow us to assume that the tested materials will meet the strength requirements for the footplates. Polymer concrete containing 10% of ash was found to be the optimal material for producing the plates. It has shown the best resistance to environmental aging of all tested concretes. The designed mold system is simple and reliable - it is applicable for serial production of the plates in industrial conditions. The visual quality of the plates produced is very good. In general, polymer concrete once again turned out to be a very good material, applicable in various elements for the construction industry.

2

Properties of developed synthetic lightweight aggregate (composite) based on hydraulic binders and waste

Głodniok Marcin, Korol Jerzy, Zawartka Paweł

Composites Theory and Practice

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2022

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R. 22, nr 4

191--195

EN

Lightweight aggregates developed on the basis of hydraulic binders and mining waste were investigated in the study. Original technology was utilized to obtain the aggregates. The synthetic aggregate materials obtained in the work satisfy the basic requirements for materials used in construction. Granulates were obtained by granulating raw materials with a counter-current high intensity mixer having a nominal capacity of 30 litres. A rotary tube furnace was selected as the most appropriate to sinter the produced granulates. The proces combined two operations: burning the combustible fractions (sewage sludge) responsible for porosity, and sintering (consolidating) the granulate. The sintering process was conducted at the temperature of 950°C in the presence of air. The working reactor tilt was about 2°. Initially the rotational speed for the quick tests was 4.28 rpm, which yielded a granule residence time of about 7.3 minutes in the heating zone (a variant was applied for the tests). The obtained aggregates were subjected to strength testing, and their crushing resistance was determined based on standard PN-EN 13055-1. Depending on the proportions of the individual raw materials, the aggregates are characterised by high crushing resistance from 4.1 to 6.5 MPa, which confirms the potential for their industrial application. These aggregates may be used for purposes such as lightweight building and pavement concrete production due to their relatively low bulk density.

3

Analysis of the possibilities of using composite structural c-channels as lining for an arch support in mining excavation

Rotkegel Marek, Korol Jerzy, Sobczak Dagmara

Archives of Mining Sciences

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2021

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Vol. 66, no. 3

437--455

EN

The article is the result of a project aimed at developing and implementing a design of composite accessories for support in excavations located in underground hard coal mines. The research team verified the possibility of using elements made of prefabricated composite structural profile as an alternative to steel and reinforced concrete lining elements used to improve support’s stability and protect against rockfall. This paper includes a research experiment on the possibilities of using a composite C-profile element as lining made in the pultrusion technology with a longitudinal position of the roving. The prefabricated structural profiles were adapted to the function by designing seatings for fitting the flanges for arch support’s V-profiles. Prototypes of these elements were subjected to bench tests in compliance with the guidelines for testing mesh linings. In addition, computer simulations using the finite element method were carried out. The values obtained during the tests were compared with the requirements for lightweight mesh and included the Polish standard PN-G-15050 and reinforced A-type concrete lining defined in the standard PN-G-06021. The team determined the areas where material strength exceeded and the structure was damaged. Despite the limited quantity of laboratory tests and lack of field tests in actual mining conditions, it was possible to address the argument of the research and determine whether it is possible to use C-profile made in the pultrusion technology as a lining element.