| 摘要 |
1506986 Lightweight particulate aggregate J WALLS-MUYCELO 26 Aug 1976 [27 Aug 1975] 35592/76 Headings C1H and C1M A porous lightweight particulate aggregate, for use in concretes, mortars, building blocks and other building elements, comprises expanded and vitrified low alkalinity particles of a material composed of an alkali metal silicate having an M 2 O/SiO 2 ratio of 1:2 to 1:4 where M is an alkali metal, silica in an amount of from 0À1 to 50 wt. percent of said alkali metal silicate, an alkaline earth metal silicate in an amount of from 0À1 to 200 wt. percent of said alkali metal silicate, and suitable fillers and additives (e.g. boric acid, alkali metal tetraborate, carbon, metal carbides and potassium oxide) to impart specific properties to the aggregate, said expanded and vitrified low alkalinity particles having a density of not more then 60 g/dm<SP>3</SP> and a compression strength of up to 275 kg/cm<SP>3</SP> and having an expansion ratio of up to 15 times their original collapsed volume. A blowing agent (e.g. wheatflour or potassium nitrate) in an amount of from 0À1 to 30 wt. percent of the said alkali metal silicate may also be added. |
