| 摘要 |
PCT No. PCT/CH79/00128 Sec. 371 Date Jun. 6, 1980 Sec. 102(e) Date Jun. 2, 1980 PCT Filed Oct. 4, 1979 PCT Pub. No. WO80/00696 PCT Pub. Date Apr. 17, 1980. An expanded glass aggregate has a granulometry of 0.2 to 3 mm and 106 to 107 cavities filled with gas per cm3. The diameter of the larger cavities is substantially smaller than 0.1 mm. All or a majority of the cavities are closed cells having a similar size. The expanded glass aggregate may contain in addition up to 85% of concrete, lava and/or tuff. For the preparation, the raw material is ground into a flour, mixed with a blowing organic and/or inorganic material appropriate to hot release gas, and a semi-finished aggregate is formed with a diameter of the granules of 0.1 to 1.5 mm. This aggregate is heated in a vibrating or suspended furnace during 5 to 180 seconds at a temperature of 600 DEG to 900 DEG C. The expanded glass aggregate is removed away from the furnace before a significant number of small cavities formed during the blowing gather to form larger cavities.
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