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1

Thermal, mechanical and moisture properties of polimer plaster modified with lightweight fillers

Marchewka Izabela, Downar-Zapolska Ewa, Pichór Waldemar

Composites Theory and Practice

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2022

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R. 22, nr 3

160--165

EN

Thermally insulating lightweight plasters are urgently needed for the development of sustainable energy-saving buildings. The creation of such a material is possible because of the use of lightweight fillers, which are of interest to many researchers. As a result of their porous structure, it is possible to lower the density and thermal conductivity of various materials. The aim of this work is to analyze the influence of hollow glass microspheres in two granulations and expanded glass on the parameters of polymer plaster. Composites containing various amounts of lightweight fillers were prepared. Then, their parameters were compared in terms of the mechanical properties, thermal conductivity, vapor permeability, and water absorption. All three lightweight fillers successfully reduced the density of the polymer mass and improved plaster insulation. The best effect was achieved with both types of hollow glass microspheres. The weight of the polymer binder was reduced by up to 80%. In the case of expanded glass, the density was only reduced by 38%. At the same time, the composites were studied in terms of their mechanical and moisture properties. The specimens with the highest amount of lightweight filler showed significant deterioration in elasticity due to disturbance of the pigment:binder ratio. They cracked at lower deflection angles. By not exceeding 20% of the filler, no effect on flexibility was observed in any of the three investigated fillers. Interpretation of the research results indicates that the studied lightweight fillers allow a plaster mass to be obtained with an extremely low thermal conductivity coefficient, less than 0.086 W/mK. However, while ensuring the optimal proportion between fillers and polymer binder, it is possible to reduce the coefficient to 0.261 W/mK without noticeable deterioration of the mechanical properties.

2

Fabrication Optimization of Al 7075/Expanded Glass Syntactic Foam by Cold Chamber Die Casting

Bolat C., Goksenli A.

Archives of Foundry Engineering

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2020

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Vol. 20, iss. 3

112--118

EN

Recently, aluminum matrix syntactic foams (AMSFs) have become notably attractive for many different industrial areas like automotive, aerospace, construction and defense. Owing to their low density, good compression response and perfect energy absorption capacity, these advanced composite materials are also considered as strong alternatives to traditional particle reinforced composites and metal foams. This paper presents a promising probability of AMSF fabrication by means of industrial cold chamber die casting method. In this investigation, contrary to other literature studies restricted in laboratory scale, fully equipped custom-build cold chamber die casting machine was used first time and all fabrication steps were designed just as carried out in the real industrial high pressure casting applications. Main casting parameters (casting temperature, injection pressure, piston speed, filler pre-temperature and piston waiting time) were optimized in order to obtain flawless AMSF samples. The density alterations of the syntactic foams were analyzed depending upon increasing process values of injection pressure, piston speed and piston waiting time. In addition, macroscopic and microscopic investigations were performed to comprehend physical properties of fabricated foams. All these efforts showed almost perfect infiltration between filler particles at the optimized injection parameters.

3

Expanded glass in insulating monolithic refractories

Stölzel F.

Materiały Ceramiczne

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2017

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T. 69, nr 3

203--206

EN

Expanded glass has been in use for a wide variety of products as in dry mortar products, panels, lightweight concrete and fills. The following approach investigates the applicability of expanded glass produced by the company Dennert Poraver in an aluminate cement matrix for insulation monolithic refractories according to EN ISO 1927-1:2012. To examine the capability, the material was fired to certain temperatures. Mechanical properties were tested on standard beams before and after the heating. The chemical composition and mineral phases of the system were determined by XRF and XRD. To estimate the properties as insulating material, the thermal conductivity of the materials was investigated. Finally, the behaviour of the material during the heating process was monitored by heating microscopy.

PL

Szkło ekspandowane jest wykorzystywane w szerokiej gamie produktów takich jak wyroby na bazie suchych zapraw, panele, lekkie betony i wypełniacze. Niniejsza praca bada zastosowanie szkła ekspandowanego wyprodukowanego przez Dennert Poraver w matrycy cementu glinowego przeznaczonej na ogniotrwałe izolacje monolityczne wg normy EN ISO 1927-1:2012. Aby zbadać tę zdolność, materiał był wypalany w pewnych temperaturach. Właściwości mechaniczne badano wykorzystując standardowe belki przed i po wypaleniu. Skład chemiczny i fazy mineralne układu zostały oznaczone za pomocą XRF oraz XRD. Aby ocenić właściwości izolacyjne, zbadano przewodność cieplną materiałów. Na koniec zbadano zachowanie materiału podczas procesu ogrzewania za pomocą mikroskopii grzewczej.