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Glass-Ceramic Foams from ‘Weak Alkali Activation’ and Gel-Casting of Waste Glass/Fly Ash Mixtures

机译:弱碱活化产生的玻璃陶瓷泡沫和废玻璃/粉煤灰混合物的凝胶浇铸

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摘要

A ‘weak alkali activation’ was applied to aqueous suspensions based on soda lime glass and coal fly ash. Unlike in actual geopolymers, an extensive formation of zeolite-like gels was not expected, due to the low molarity of the alkali activator (NaOH) used. In any case, the suspension underwent gelation and presented a marked pseudoplastic behavior. A significant foaming could be achieved by air incorporation, in turn resulting from intensive mechanical stirring (with the help of a surfactant), before complete hardening. Dried foams were later subjected to heat treatment at 700–900 °C. The interactions between glass and fly ash, upon firing, determined the formation of new crystal phases, particularly nepheline (sodium alumino–silicate), with remarkable crushing strength (~6 MPa, with a porosity of about 70%). The fired materials, finally, demonstrated a successful stabilization of pollutants from fly ash and a low thermal conductivity that could be exploited for building applications.
机译:对基于钠钙玻璃和粉煤灰的水性悬浮液进行了“弱碱活化”。与实际的地质聚合物不同,由于所用的碱活化剂(NaOH)的摩尔浓度较低,因此预计不会广泛形成类似沸石的凝胶。在任何情况下,该悬浮液都发生凝胶化并表现出明显的假塑性行为。在完全硬化之前,通过强力机械搅拌(借助表面活性剂)可通过引入空气实现显着的发泡。干燥的泡沫随后在700-900°C的温度下进行热处理。煅烧后,玻璃和粉煤灰之间的相互作用决定了新晶体相的形成,特别是霞石(铝硅酸钠),具有显着的抗压强度(〜6 MPa,孔隙率约70%)。最终,这些经过焙烧的材料证明了成功地稳定了粉煤灰中的污染物,并且导热率低,可用于建筑应用。

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