CONCRETE COMPOSITION BASED ON WOOD AGGREGATES STABILIZED BY SILIFICATION.

Abstract

The invention relates to a new concrete composition, allowing the production of prefabricated elements by compaction as defined by patent FR 89 08081, based on stabilized wood aggregates associated with: a specific binder chosen from aluminous 'so-called fused' and pozzolanic cements; a curing admixture chosen from sodium aluminate, calcium chloride and latex resin; a fibrous reinforcement chosen from: bamboo, alkali-resistant glass, polypropylene, carbon and cast iron fibers.

Description

The present invention relates to a concrete composition based on stabilized wood aggregates. The main patent No. 88 08697, to which this certificate of addition is attached, concerns a concrete of a composition based on wood aggregates stabilized by silicification (according to patent FR 2,449,551). The purpose of this addition is to propose a new concrete composition, enabling the production of prefabricated elements using the compaction technique as defined by patent FR 89 08081, based on wood aggregates stabilized by silicification, other than that related to the main patent, allowing -firstly, to reduce the manufacturing time of prefabricated elements by reducing the usual curing times by a factor of between 5 and 1 -on the other hand, to increase the mechanical resistance of the products made by increasing their mechanical resistance in tension and compression from 1 to 2. The reduction in manufacturing time and the increased tensile and compressive strength of the products allow the use of this new composition in new fields such as the manufacture of safety barriers for roads and highways, as well as railway track supports. Indeed, thanks to the specific characteristics of the prefabricated elements, their use provides good deformability without sudden breakage, and excellent acoustic comfort for rolling on the rails and in the external environment (vibrations from nearby buildings). The said composition comprises - wood granules stabilized by silicification to which the following materials are added -specific binders made up of aluminous cements (also called fused cements); pozzolanic cements -treatment adjuvants consisting of sodium aluminate; latex resin; calcium chloride -short, medium or long fibrous reinforcements made up of fibers alkali-resistant glass; polypropylene; carbon; cast iron; bamboo In general, the proportion of different materials combined with stabilized wood granules can vary as indicated below. -specific binder between approximately 5 and 80%, preferably between 20 and 60% and particularly between 40 and 50% by weight, relative to the total composition -curing adjuvant between approximately 0.2 and 3.0%, preferably between approximately 0.5 and 2.0%, and particularly between approximately 0.5 and 1.0% by weight, relative to the weight of binder -Fibrous reinforcement: between approximately 3.0 and 20.0%, preferably between approximately 5.0 and 15.0%, and particularly between approximately 5.0 and 10.0% by weight, relative to the weight of binder

Claims

CLAIMS 1 -Concrete composition, allowing the production of prefabricated elements, based on wood aggregates stabilized by silification associated with -a specific binder - a cure adjuvant -a fibrous reinforcement according to claim 1 of the main patent 2 -concrete composition according to claim 1, characterized in that the specific binder is chosen from aluminous cements 'called molten' and pozzolanic cements 3 -concrete composition according to the claims 1 and 2, characterized in that the proportion of the specific binder is between approximately 5 and 80%, preferably between approximately 20 and 60% and particularly between approximately 40 and 50% by weight, calculated on the basis of the composition total 4 -concrete composition according to claim 1, characterized in that the curing adjuvant is chosen from sodium aluminate, calcium chloride and .; My latex resin 5 -concrete composition according to claims 1 and 4, characterized in that the proportion of the curing aid is between approximately 0.2 and 3.0%, preferably between approximately 0.5 and 2.0% and particularly between approximately 0.5 and 1.0 % by weight, calculated on the basis of the weight of the binder 6- Concrete composition according to claim 1, characterized in that the short, medium or long fibrous reinforcement is chosen from fibers of: alkali-resistant glass, polypropylene, carbon, cast iron, bamboo. 7 -concrete composition according to claims 1 and 6, characterized in that the proportion of the fibrous reinforcement is between approximately 3.0 and 20.0%, preferably between approximately 5.0 and 15.0% and particularly between approximately 5.0 and 10.0% by weight, calculated on the basis of the weight of the binder 8 -Concrete composition according to the preceding claims taken as a whole, characterized by its use for producing guardrails for motor vehicles and rail supports for rail transport