Abstract
AbstractThe paper shows expediency of application of natural zeolite (Transbaikal region, Russia) with ecologically safe technological additive (Na2CO3) as an initial raw material for foam glass production. According to the quantitative X-ray phase analysis, the clinoptilolite content is 50–55 wt%. It is established that optimal concentration of Na2CO3 in the composition of the charge is 15 wt%. With increasing heating temperature of dry mixture from 300 to 500 °C, it is possible to observe a systematic increase in the intensity of foaming. It was found out that the density of pellets obtained from a blend with the sodium carbonate content of 15% after firing at 900 °C is 0.25 g/cm3. The analysis of physical and mechanical properties of the obtained foam glass shows that the samples based on natural zeolite are not inferior in properties to foam glass of known compositions. It is possible to obtain these thermal insulating materials using a low-temperature safe technology with replacement of the traditional NaOH fluxing agent by a less toxic one - Na2CO3. This foam glass can be used for effective thermal insulation in road construction.KeywordsZeoliteClinoptiloliteFoam glassRoad-building materialsThermal insulating materials
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