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Wooden composites from beech plywood and decorative veneers of different natural durability - their decay resistance and selected physico-mechanical properties

100%

Reinprecht L., Izdinsky J., Kmet'ova L.

Folia Forestalia Polonica. Series B - Drzewnictwo

2011

tom 42

This work deals with decay resistance and selected physical and mechanical properties of wooden composites (WCs) prepared from 3.6 mm thick three-layer beech plywood and 0.6 mm thick decorative surface veneers of selected exotic (aningr´e, bubinga, iroko, khaya, padouk, sapelli, weng´e) and domestic (beech, European oak, sweet chestnut, walnut) wood species. Joining of veneers in the plywood and then also in the WCs was carried out by pressing processes using the PF glue Fenokol 43. The aim of the experiment was to determine the influence of surface veneers of different natural durability on rotting of the WCs, and on resistance of the WCs to water and mechanical loadings, as well. Decay resistance of individual veneers and WCs was tested by modified EN 113 against the brown-rot fungi Serpula lacrymans or Coniophora puteana, and the white-rot fungi Phanerochaete chrysosporium or Trametes versicolor. Weight losses of individual types of veneers and WCs caused by wood-destroying fungi were compared with weight losses of beech-veneer and beech-WC, respectively. The lowest weight losses at rotting processes showed the padouk-WC, i.e. WC prepared from the beech plywood and two the most durable padouk surface veneers. Density, water soaking, water swelling, tensile strength perpendicularly to the plane (?), and bending characteristics (MOR, MOE) of all WCs were determined in accordance with European standards. These physical and mechanical properties of the WCs were only partly influenced by the type of surface veneers. Selected types of the WCs, e.g. padouk-WC, could also be convenient for exterior expositions out of ground contact.

High-temperature processing of asbestos-cement roofing material in a plasma reactor

76%

Lazar M., Carnogurska M., Brestovic T., Jasminska N., Kmetova L., Kapustova L., Jezny T.

Polish Journal of Environmental Studies

2016

tom 25

nr 5

This article describes a disposal method for two types of waste in a plasma reactor operating in a dependent connection, and the subsequent transformation of such waste into a vitrified glassy slag. Those two wastes are asbestos-cement roofing material and the fly ash from fluidized bed boilers. The first waste falls into the category of hazardous waste and the latter one in the category of so-called non-hazardous waste. In the Slovak Republic, both types of waste are currently disposed of through landfilling. Deficiencies related to landfilling waste are sorted through plasma melting technology in stationary and mobile modes. Achieving an inert product after the combined plasma melting of the mentioned waste is attained through the correct mix ratio and temperature. The high temperatures reached in the reaction chamber of the plasma reactor (up to 1,400ºC) guarantee the recrystallization of the chrysotile fibers represented in the asbestoscement roofing materials and their transformation into a glass matrix of the emerging products, creating vitrified slag. This product is predominantly a stable slag oxide (a mixture of SiO2, CaO, Al2O3, and MgO). It forms at the bottom of the reactor, a liquid phase that, following a regulated cooling phase, possesses properties suitable for further use in the production of insulation materials and ceramic products.

Ograniczanie wyników

1 Folia Forestalia Polonica. Series B - Drzewnictwo

1 Polish Journal of Environmental Studies

1 Brestovic T.

1 Carnogurska M.

1 Izdinsky J.

1 Jasminska N.

1 Jezny T.

1 Kapustova L.

1 Kmet'ova L.

1 Kmetova L.

1 Lazar M.

1 Reinprecht L.

1 2016

1 2011

Wyniki wyszukiwania

Wooden composites from beech plywood and decorative veneers of different natural durability - their decay resistance and selected physico-mechanical properties

High-temperature processing of asbestos-cement roofing material in a plasma reactor