A method for the preparation of organic auxiliary - and additives for the construction industry on the basis of cellulose material

摘要

Cellulosic material, e.g. sawdust or wood shavings, is impregnated, preferably at an elevated temperature, with an aqueous solution of one or more metal sulphates, e.g. iron sulphate, whereafter a second impregnation with metal sulphate may be performed, and coated with alginic acid or one or more salts thereof; an aqueous solution of a compound of Ca, Ba or Sr is incorporated; and, if desired, the treated mass may be coated with e.g. dry powdered cement. The treatment with alginates may be performed at any stage in the above process. The alginates may be used alone or in admixture with fillers, dyes, pigments, or catalysts for the setting and hardening of concrete. The product may be added to aggregate used in concrete. Instead of cement, lime, plaster, ashes, slag powder, pumice or puzzola may be used. The product may be mixed with concrete aggregate, sand, gravel, polystyrene granules, polyurethane, polyvinyl foams, or vermiculite. The material may be reinforced with beams, wood lathings, straw, reed, jute cloth, fibre-glass cloth, rock cloth, or nylon cloth.ALSO:Concrete or mortar comprises conventional aggregate mixed with a treated cellulosic material, thus diminishing the amount of water required for the mixing, increasing the work-ability and rendering the concrete waterproof. One volume of the treated cellulosic material may be mixed with e.g. 5-60 volumes of the aggregate. The cellulosic material is treated by one or two impregnations with metal sulphates, coating with alginic acid or alginates, and incorporation of compounds of Ca, Ba or Sr; if desired, the treated mass may be coated with dry powdered cement, or plaster, ashes, slag powder, pumice or puzzola may be used as a coating or as an additive. Fillers, dyes, pigments or catalysts for the setting and hardening of concrete may be incorporated.