| 摘要 |
<p>1532178 Corrosion resistant cement compositions AKSJESELSKAPET NORCEM 5 July 1977 [9 July 1976] 28129/77 Heading C1H A cement composition comprises cement having a low content of aluminate (C 3 A) and at least 10 weight per cent based on the cement of finely divided reactive silica obtained by sublimation and quenching of silica-containing raw-material. The composition may be made by mixing together with the cement, sand and water an additive comprising 0-10 wt. per cent of the cement, 80-90 wt. per cent of the reactive silica, 3-8 wt. per cent of formaldehyde condensed sodium naphthalene sulphonate and 3-8 wt. per cent lignosulphonate.</p> |
