DURABLE AND HIGHLY STABLE MOULDED CONSTRUCTION PARTS

摘要

The invention relates to durable and highly stable moulded construction parts, the strength values and in particular the bending strength-density ratios of which have been improved considerably compared to the construction materials to be replaced. Plate-shaped moulded parts in particular may be produced from this new material. The starting materials are the hydration products of a cement or of a cement-like binder and alkali-sensitive reinforcing material such as in particular ligno-celluloses. In order to maintain the strength of these moulded parts which is increased due to the reinforcing material contained therein also during the general life span necessary for parts of this kind, a binder system is used which produces an alkaline buffer capacity in the construction material which does not exceed 0.005 acid equivalents/100g of construction material in a defined aqueous test suspension 24 hours after its production. Apart from ligno-celluloses as reinforcing material a low-alkali mixture from finely ground blast sand, hemi-hydrate gypsum and Portland cement is used which develops a high degree of adhesion to the ligno-cellulose fibres due to its special reaction mechanism.