A PROCEDURE TO MANUFACTURE CONFORMED ARTICLES REINFORCED BY FIBERS.

摘要

In a process for the manufacture of green shaped articles having a density of at least 1000 kg/m3 and a matrix of a cured inorganic binder said articles are prepared by dewatering an aqueous slurry of fibres and a matrix forming material comprising particles of an inorganic hydraulic binder, particulate inorganic additive and possibly other additives containing an excess of water in relation to the amount necessary to secure curing of the hydraulic binder, and containing, on a dry weight basis, 3-20%, preferably 5-20%, in particular 7-15%, cellulose fibres, after which the green shaped articles are cured. The matrix forming material comprises, on a dry weight basis, 40-90%, preferably 45-85%, of a coarse material with an average particle size of 35-12 mu m, preferably 25-18 mu m, preferably with a particle size distribution exhibiting only one maximum, comprising the hydraulic binder and possibly a silica- or silicate-containing, preferably pozzolanic active additive, 5-45%, preferably 10-40%, in particular 10-35%, of a fine inorganic, preferably silica- or silicate-containing, in particular pozzolanic active additiv e with an average particle size of 10-1 mu m, preferably 7-3 mu m, preferably with a particle size distribution cxhibiting only one maximum, 3-25% of an ultra fine preferably pozzolanic active additive with an average particle size within the range 1-0.02 mu m, preferably less than 0.5 mu m, and 0-30% other additives.