| 摘要 |
1371534 Communications compositions SOCIETA ITALIANA PER AZIONI PER LA PRODUZIONE DI CALCI E CEMENTI DI SEGNI 18 Jan 1972 [27 Jan 1971] 2375/72 Heading C1H [Also in Division C3] Compound articles of manufacture are prepared by impregnating an article, formed from a hydraulic cement material, with a polymerizable substance, e.g. methyl methacrylate or styrene, and immersing the impregnated article into a liquid medium, e.g. water, glycerine or a mineral oil, maintained at a temperature to effect complete polymerization of said liquid in situ, the liquid medium being a non-solvent for the polymerizable substance. Cement materials illustrated are (1) concrete formed from a Portland cement/sand mix and basaltic inerts, (2) pozzalana cement containing basaltic inerts and (3) asbestos cement. |
