Verfahren zur Herstellung von Baustoffen

摘要

1353036 Cement compositions MITSUI TOATSU CHEMICALS Inc and TAISEI KENSETSU KK 19 April 1971 [9 March 1970 30 March 1970 13 June 1970 10 July 1970] 23535/71 Heading C1H [Also in Division C3] Structural materials for civil engineering and construction work are prepared by impregnating a porous cementitious base material with one or more ethylenically unsaturated compound, immersing the impregnated base material in a highly viscous liquid which has a viscosity higher than 0À1 poise and which does not react or mix with the unsaturated compound, and thereafter at least partially polymerizing the unsaturated compound in the presence of a peroxide or azo catalyst. The base material may be formed by mixing cement, mortar, concrete, gypsum or lime with water, casting and hardening by standing or heat treatment, and may also be impregnated with (a) a C 10 -C 30 aliphatic hydrocarbon, (b) a C 5 -C 20 aliphatic alcohol, (c) a C 6 -C 40 aliphatic ether, (d) a C 6 -C 40 carboxylic acid ester or (e) an alkaline earth metal carboxylate. The viscous liquid may be an aqueous solution of sodium alginate, water glass, glycerol, ethylene glycol or a silicone oil. In examples (1, 3, 4 and 5) mortars formed from Portland cement, fine aggregate or sand and water, (2 and 4) concretes from from Portland cement, fine aggregate or river sand, coarse aggregate or crushed limestone and water, and (4) gypsum are impregnated with methyl methacrylate or styrene/acrylonitrile mixture and immersed in (1) water glass or (2 to 5) glycerol for polymerization.