Wyniki wyszukiwania - BazTech

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Piaski odpadowe jako wartościowe kruszywo do wytwarzania fibrokompozytów

Głodkowska W., Laskowska-Bury J.

Rocznik Ochrona Środowiska

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2015

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Tom 17, cz. 1

507--525

EN

In the paper an issue of waste sand utilization was raised. The heaps of waste sand located in Polish region Pomerania are by-product obtained during the process called hydroclassification of all-in-aggregate for concrete production. One of examples how to resolve the waste sand utilization problem could be its application for the production of steel fiber reinforced mineral composites. The authors introduced their tests results physical-mechanical properties of fibrous composites made on the basis of waste sands with different amounts of steel fibers. Steel fiber content is from 0 to 2.5% relative to the volume of the composite. The fibers in the mixture were arranged at random. Based on these results proposed composite of the best properties, which meets the requirements for construction materials. It was specified the exact composition of the material of this composite. For the selected composite steel fibre content of 1.2% of tests taken basic properties: compressive strength, tensile strength, residual strength, modulus of elasticity, shear strength, resistance to frost, resistance to abrasion. Tests were performed on samples having a side of 150 cubic mm and cylindrical with the dimensions 150x300 mm. Carried out research, literature studies and analysis of the obtained results allow to conclude that this material can be used for the performance of structural elements and thus creates a perspective on the use of waste aggregates. In view of the above, the large resources of small aggregates present in the form of waste could become a wealth for the region of Pomerania. Sands waste could become a basic component of materials intended for the manufacture of certain structural elements. The use of waste to produce aggregate composites constructional on a wider scale, and partial replacement of concrete simple-it such material can significantly reduce further degradation of the environment.

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Badania wymywalności substancji szkodliwych ze zużytych mas odlewniczych

Grabowska B.

Laboratorium - Przegląd Ogólnopolski

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2014

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nr 11-12

41--44

PL

W artykule opisano metody badań wymywalności substancji szkodliwych ze zużytych mas formierskich. Przedstawiono wyniki oznaczeń substancji szkodliwych wymywanych ze zużytych mas ze spoiwem polimerowym. Stwierdzono, że zarówno masa wyjściowa, jak i zużyta charakteryzują się mniejszymi wartościami stężeń oznaczanych substancji w porównaniu do wartości stężeń oznaczonych dla mas z żywicą fenolowo-formaldehydową oraz żywicą mocznikowo-furfurylową.

EN

In this paper presented the methods of the studies made on the elution rate of some harmful compounds from the waste sands. The basic the results of research determinations of harmful substances eluted from tested waste sands with polymer binders were presented. Both the new sand as well as the used one are characterized by lower values of the concentration of the investigated substances than the values of concentration determined for the sands with phenol-formaldehyde resin and urea-furfuryl resin.

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Zastosowanie piasków odpadowych do wykonywania posadzek przemysłowych

Głodkowska W., Kobaka J.

Rocznik Ochrona Środowiska

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2009

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Tom 11

193-206

PL

Beton jest najpowszechniej stosowanym budowlanym materiałem kompozytowym, do którego wytworzenia rocznie na świecie zużywa się 20 mld ton kruszywa. W przeliczeniu na każdego mieszkańca globu oznacza to zużycie 3 ton kruszywa rocznie [1]. Produkcja betonu może więc w sposób znaczący wpływać na środowisko naturalne. Do jego produkcji stosuje się mieszankę kruszywa grubego, najczęściej żwiru oraz drobnego, głównie piasku kwarcowe-go. Proporcje kruszywa grubego do drobnego w betonie zwykłym wynoszą w przybliżeniu 3:1. Jeżeli proporcje występowania tych składników w miejscu ich pozyskiwania byłyby podobne lub składniki te występowałyby oddzielnie, ich wydobycie przebiegałoby bezodpadowo. Na obszarze geograficznym Polski, a w szczególności w regionie Pomorza tak jednak nie jest. Przyjmuje się, że około 90% złóż kruszyw grubych znajduje się w regionie południowym Polski, 6% w regionie środkowym i tylko 4% w regionie północnym [2]. Powoduje to deficyt kruszyw gruboziarnistych w regionie północnej Polski.

EN

Concrete is the most commonly known composite material used in civil engineering, thus concrete production influences significantly the natural environment especially in developing countries. The main component of cement composite is aggregate which covers from 60% to 80% of cement composite volume. Global annual production of concrete, mortar and other cement based composites consumes 20 billion tonne of different aggregate. It means that about 3 tonne of aggregate is used per person per year. The production of ordinary concrete usually consumes coarse aggregate (e.g. gravel) and fine aggregate (e.g. sand) in weight proportion approximately equal to 3:1. If the weight proportion of the occurring of coarse aggregate and fine aggregate in a specific geographical region were close to 3:1, then the production of cement composites would be entirely balanced and would be carried out without any aggregate waste. Unfortunately, natural resources of coarse and fine aggregates can be found in very different weight proportions. For example, natural aggregates in Pomerania region in Poland are of glacial origin and they occur in a form of sands and all-in-aggregates. Production of ordinary concrete based on such, locally available fine aggregate is hindered. High transport costs of coarse aggregate from distant pit deposits (often over 200km) to the production facility, force producers to use the process of hydroclassification of natural all-in-aggregate in order to receive coarse aggregate. Approximately half of documented deposits of aggregate in the Pomerania region is constituted by deposits hydroclassified during the exploitation. Process of hydroclassification allows to divide all-in-aggregate into coarse aggregate and fine aggregate. Waste fine aggregate is a by-product of hydroclassification process. Because of a huge deficit of coarse aggregate in the region, coarse aggregate obtained during hydroclassification of all-in-aggregate is constantly being sold and always on demand enlarging heaps of waste sand. In the paper an issue of waste sand utilization was raised. Various civil engineering applications of waste fine aggregate cement composites have proved that meticu-lously made fine aggregate cement composite is characterized by satisfactory strength and durability in order to be applied in civil engineering as a standard construction ma-terial. One of examples how to resolve the waste sand utilization problem could be its application for the production of steel fiber reinforced mineral composites used for industrial floors. The authors introduced their tests results based on selected properties of fine aggregate fibrous composites with different amounts of steel fiber. The study is a small part of a broad research program.