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Title: X-ray micro-tomography investigation of the foaming process in the system of waste glass–silica mud–MnO{sub 2}

In case of foamed lightweight aggregates (LWAs), porosity is introduced by the addition of a foaming agent to the glassy matrix, which degasses at an elevated temperature, so that the resulting gases remain trapped inside the glassy structure. The efficiency of action of MnO{sub 2} as a foaming agent in waste glass and waste glass/silica mud systems was studied. Samples were fired at different temperatures and with different dwelling times at a certain temperature, and the development of porosity was investigated by means of X-ray micro-tomography. It was found that, with the prolongation in dwelling times, the number of pores decreased, while, on the other hand, the volume of these pores increased, and that the addition of silica mud increases the foaming temperature and slows down the foaming process. - Highlights: • Preparation of lightweight aggregate from waste glass, silica sludge, and MnO{sub 2} • DTA/TG investigation of MnO{sub 2} • Characterization of pore-forming process by means of X-ray micro-tomography (μcT)
Authors:
 [1] ; ;  [1] ;  [2]
  1. ZAG Ljubljana, Dimičeva 12, 1000 Ljubljana (Slovenia)
  2. NTF, Aškerčeva 12, 1000 Ljubljana (Slovenia)
Publication Date:
OSTI Identifier:
22288716
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Characterization; Journal Volume: 86; Other Information: Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; FOAMS; GLASS; MANGANESE OXIDES; POROSITY; SILICA; TOMOGRAPHY; WASTES; X RADIATION