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1

Effective use of construction and demolition waste and stone dust in construction for the production of manufactured aggregates in two pilot regions of the Czech Republic

Vachuška Václav, Vachuška Jan, Vološinová Dagmar, Vachuška Aleš

Environment Protection Engineering

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2022

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Vol. 48, nr 2

87--95

EN

The authors present a unique possibility of utilizing hitherto unused and difficult-to-store types of waste such as dust generated during the extraction and treatment of a natural stone, and still difficult to recycle part of construction and demolition waste – residual mineral inert material. Stone dust mixed with residual mineral inert material, water, and binders in various proportions formed five types of mixtures which were transformed into manufactured aggregates using hyper-pressing. The properties of these manufactured aggregates – resistance to crushing and bulk density – presented on laboratory-based samples were similar to those of natural aggregates. The production of manufactured aggregates, the processing of unused types of construction and demolition waste, together with stone dust, fully comply with the rules of circular economics. The availability of stone dust has been checked based on data obtained by personally interviewing the authors in the quarries of the pilot regions of South Bohemia and Pilsen. Data on the amount of construction and demolition waste produced were obtained from the publicly available database of produced construction and demolition waste – Waste Management Information System (ISOH).

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Stone dust agglomeration for utilizing as building material

Borowski G., Świderski T., Ozga M.

Advances in Science and Technology. Research Journal

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2017

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Vol. 11, no 4

168--174

EN

In the paper we discuss the possibility of using stone dust for utilizing as building material. The tested material was amphibolite, found in the Sudeten Mountains and the Tatra Mountains in Poland. The chemical composition of dust was determined by means of spectrometry methods. Moreover, the basic physical properties of the material were designated. Stone dust was mixed with starch or cement binder. The binder addition was from 5% to 20% by weight. The water content was adjusted to about 25% humidity. The mixture was then compressed in a hydraulic press at 50 MPa. The results of the mechanical toughness of agglomerates were shown. On the basis of the results, acceptable toughness of agglomerates was found, with the addition of cement in mass share 20% and seasoning for 48 hours. However, starch was not suitable as a binder for agglomeration of amphibolite.

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Optical reflectometric sensor of lime stone concentration in dust residing in coal mines excavations

Sidor T., Lebecki K., Hadryś D., Nowak P., Trzcionka S.

Zeszyty Naukowe Wyższej Szkoły Zarządzania Ochroną Pracy w Katowicach

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2014

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Nr 1(10)

24--31

EN

For safety reason it is required to check periodically concentration of non- flammable components in dust deposited in coal mines entries . The traditional procedurę requires the dust samples to be collected in locations determined by safety regulations and transport them to the surface where the concentration of non- flammable components can be evaluated in the laboratory. It would greatly simplified the required procedurę if the dust samples could be tested directly on site . Attempts to construct the suitable equipment, based on measurements of relative intensity of light reflected from dust sample, although almost completed, finally has been abandoned because the manufacturer of reflectometric sensors ceased its production. The following paper presents results of research project which goals was to develop probe, based on commonly available components, which could substitute, the initial sensor choice and further to make possible to complete finally the measuring device. It seems that the initial goal of the project has been successfully achieved.

PL

Ze względów bezpieczeństwa wymagane jest okresowe sprawdzanie stężenia niepalnych składników w pyle znajdującym się w wyrobiskach kopalń. Tradycyjna procedura badawcza wymaga pobrania próbek pyłu w miejscach określonych przez przepisy bezpieczeństwa i przetransportowania ich na powierzchnię, gdzie stężenie niepalnych składników może być oceniane w laboratorium. Znacznym uproszczeniem wymaganej procedury byłoby badanie próbek pyłu bezpośrednio na miejscu w wyrobisku. Prowadzone były próby skonstruowania odpowiedniego sprzętu badającego względne natężenia światła odbitego od próbki pyłu.Jednak pomimo prawie zakończonych badań pomysł ten został porzucony z uwagi na fakt, iż producent czujników reflektometrycznych zaprzestał ich produkcji. W pracy przedstawiono wyniki badań, których celem było opracowanie sondy, w oparciu o powszechnie dostępne elementy. Mogą one zastąpić pierwotnie wybrany przetwornik reflektometryczny i umożliwić zakończenie budowy urządzenia pomiarowego. Wydaje się, że początkowy cel projektu został skutecznie osiągnięty.

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Dodatki mineralne w produkcji wibroprasowanych elementów betonowych

Mrozik Ł., Kaczmarek A., Doering M., Socha P.

Materiały Budowlane

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2013

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nr 10

35--36

PL

W artykule przedstawiono badania dodatków mineralnych stosowanych w produkcji wibroprasowanych elementów betonowych. Oprócz powszechnie stosowanych w fabrykach galanterii betonowej dodatków, czyli mikrokrzemionki i popiołów lotnych, omówiono modyfikację struktury betonu odpadem w postaci pyłów pochodzących z produkcji kruszyw łamanych. Jest to dodatek zdobywający obecnie coraz większą popularność.

EN

In this paper, the analysis of mineral additives used in production of vibropressed concrete decoration elements has been presented. In addition to the commonly used additives such as fly ash andmicrosilica, modification of structure with powder from aggregate dedusting has been discussed.This additive is actually gaining increasing popularity.