| 摘要 |
1316732 Lightweight concrete SUDDEUTSCHE KALKSTICKSTOFF - WERKE AG 10 Aug 1971 [7 Oct 1970] 37508/71 Heading ClH A concrete comprises a light aggregate of at least one of clay, pumice, slags, perlite, vermiculite and polystyrene in expanded or foamed form, which has been treated with an aqueous solution of a So 3 containing melamine-formaldehyde condensate, and cement. Sand is optional, and is up to 0À3 mm. in size. |
