| 摘要 |
1,216,437. Cement compositions. SHELL INTERNATIONALE RESEARCH MAATSOHAPPIJ N.V. 14 April, 1969 [16 April, 1968], No. 19005/69. Heading C1H. A waterproof construction material comprises a set mixture of cement, mineral matter, and asphaltines defined as the precipitate obtained when treating a residual petroleum fraction with C 3-9 aliphatic hydrocarbons. The mineral matter can be sand, fly ash, stone, ore, slag or gravel. If aluminium is included a lightweight material results. |
