| 摘要 |
<p>The present invention pertains to techniques for producing concrete or concrete mixtures and essentially relates to a composite modifier for concrete that comprises the following members: from 51.9 to 94.12 wt % of a dispersed mineral component containing silicon dioxide, from 4.7 to 45.5 wt % of a chemical additive, the balance consisting of water. The component containing silicon dioxide consists of products from the dry gas purification of furnaces for melting crystalline silicon and/or ferrosilicon and/or ferrochromium silicon and/or fly ash and kaolin. The chemical additive consists of a plastifier containing a salt of a polycondensate of b-naphthalinsulfonic acid and formaldehyde and/or a mixture thereof with nitrylotrimethylphosphonic acid and/or with a complex salt of nitrylotrimethylphosphonic acid and/or with oxyethylidendiphosphonic acid and/or with a disodium salt of ethylendiamintetracetic acid, and/or of a plastifier containing a salt of lignosulfonic acid. The method for preparing this composite modifier for concrete involves mixing the dispersed mineral component, the chemical additive and water, and subsequently drying and granulating the mixture thus obtained in an air-gas flow of products from the combustion of natural gas or gasses which are released by furnaces for melting silicon-containing alloys or for burning mineral coal and which contain solid particles in an amount not exceeding 2.5 g/nm3.</p> |
