No abstract

In order to improve the fire retardancy of wood the eco-friendly method for in situ formation of CaCO3 deep inside the wood's structure was proposed by the vacuum-pressure impregnation of only one component – water solution of calcium acetoacetate.

The construction and demolition sector is one of the biggest consumers of natural resources in the world and consequently, one of the biggest waste producers worldwide. The proper management of construction and demolition waste (CDW) can provide major benefits for the construction and recycling industry. However, the recycling rate of CDW is relatively low, as there is still a lack of confidence in the quality of recycled CDW materials. Therefore, new research projects are looking for innovative solutions within recycling of CDW in order to overcome uncertainties currently associated with the use of construction products made from recycled or re-used CDW. In this paper, a “cradle-to-cradle” life cycle assessment (LCA) study has been conducted to investigate the environmental performance of the prefabricated geopolymeric façade cladding panels made from large fractions of CDW. The LCA results indicate that the majority of the environmental burden arises within the manufacturing stage; however, the environmental burden can be reduced with simple optimisation of the manufacturing process. Furthermore, the environmental impact of the prefabricated geopolymeric façade cladding panels is generally lower than the environmental burden associated with the façade cladding panels made from virgin materials.

No abstract

Nowadays the measurement of water vapour diffusion resistance factor of building components is performed according to EN ISO 12572 or EN 12086. Both these standards use cup methods. However, measuring vapour transmission in this way by means of linear or point water vapour bridges would be difficult because of the limited sample size and shape. Therefore in this study water vapour pressure equipment with twin chambers, according to the old Slovenian standard JUS U.J5.024 standard were used, enhanced with a guard chamber. 15 cm thick sandwich panels composed of 2 steel sheets with a mineral wool core and 5 types of joints were measured. The type of sealant used between the steel sheets (outer and inner pair) and mineral wool differs: without it, with a PUR or with an EPDM sealant. Due to the slow process of water vapour diffusion through such panels, measurements were stopped well before steady state was reached. Experimental results were modelled to obtain linear water vapour transmittance. Our modelling function contains 2 fit‐parameters. Due to the vapour‐guard, final results improve systematically. Modelling procedure works on panels, which are faster than standardised steady‐state ones.Messung und Simulation der linearen Wasserdampftransmission durch Stahl‐Sandwichpaneele mit Mineralwolledämmung. Die Messung des Wasserdampfdiffusions‐Durchlasskoeffizienten von Baukomponenten erfolgt nach EN ISO 12572 oder EN 12086. Beide Verfahren arbeiten mit Probenschalen. Die Messung der Dampftransmission auf diese Weise mittels linearer oder punktueller Wasserdampfbrücken ist aufgrund der Einschränkungen der Probengröße und ‐form jedoch schwierig. Deshalb wurde in der vorliegenden Studie ein 2‐Kammern‐Wasserdampfdruck‐Versuchsaufbau nach der alten Norm JUS U.J5.024 verwendet und mit einer Abschirmkammer verbessert. Gemessen wurden 15 cm starke Sandwichpaneelen bestehend aus 2 Stahlblechen mit MW‐Kern und 5 Arten von Fugen. Es wurden unterschiedliche Arten von Dichtstoffen zwischen den Stahlblechen (äußeres und inneres Paar) und der Mineralwolle verwendet: ohne Dichtstoff, mit einem PUR‐ oder mit einem EPDM‐Dichtstoff. Aufgrund des langsamen Voranschreitens der Wasserdampfdiffusion durch derartige Paneelen wurden die Messungen lange vor Erreichen des stabilen Zustands beendet. Die Ergebnisse des Experiments wurden simuliert, um die lineare Wasserdampftransmission zu erhalten. Unsere Simulationsfunktion enthält 2 Fit‐Parameter. Die Dampfabschirmung sorgt für eine systematische Verbesserung des Endergebnisses. Das Simulationsverfahren arbeitet mit Paneelen und ist hierdurch schneller als das Normverfahren im stationären Zustand.