| 摘要 |
<p>1343826 Coloured cements GENERAL PORTLAND Inc 14 June 1971 [30 June 1970] 27752/71 Heading C1H Coloured cement is obtained by adding 0À2- 5% of an oxide of a metal of Groups IVB, VB or VIIB no later than the burning, and rapidly quenching the clinker: V, Zn, Mn and Ti (e.g. as ilmenite) oxides are specified. Ti without Fe will give a white cement.</p> |
