FR2552755A2

FR2552755A2 - Improvement to insulating lightweight concrete, to processes for its preparation and to the products obtained with the aid of this concrete.

Info

Publication number: FR2552755A2
Application number: FR8315528A
Authority: FR
Original assignee: Individual
Current assignee: Individual
Priority date: 1977-01-19
Filing date: 1983-09-29
Publication date: 1985-04-05

Abstract

Insulating lightweight concrete consisting of vegetable waste bonded with cement, water and a hydrated magnesium silicate. Examples of application: product taking part in the making up of materials of construction, the manufacture of garden and leisure articles, industrial prefabrication intended for the building industry and for the environment, and shipbuilding.

Description

L'invention concerne des perfectionnements apportés aux bétons, matériaux de construction isolants : constitués de bois, de ciment, d'eau de gâchage et d'un agent additionnel, la proportion pondérale de bois étant supérieure à celle du ciment, ainsi qu'aux procédés de préparation de ces bétons et aux produits obtenus à l'aide desdits bétons ; les perfectionnements en question étant apportés à la technique considérée dans le brevet principal n" 7701485 du 19 janvier 1977 et qui constituait essentiellement à choisir l'agent additionnel parmi les catalyseurs permettant la polymérisation naturelle à l'air. Comme dans le brevet principal, le béton est composé de ciment, de déchets de bois en proportion pondérale majoritaire, d'eau de gâchage et d'un catalyseur permettant la polymérisation de la barbotine. The invention relates to improvements made to concrete, insulating building materials: made of wood, cement, mixing water and an additional agent, the proportion by weight of wood being greater than that of cement, as well as processes for preparing these concretes and for the products obtained using said concretes; the improvements in question being made to the technique considered in main patent No. 7701485 of January 19, 1977 and which essentially consisted in choosing the additional agent from the catalysts allowing natural polymerization in air. As in the main patent, the concrete is composed of cement, wood waste in the majority by weight, mixing water and a catalyst allowing the polymerization of the slip.

Les présents perfectionnements ont pour but, surtout, d'améliorer la stabilité des bétons considérés et d'en augmenter la résistance. The purpose of the present improvements is, above all, to improve the stability of the concretes under consideration and to increase their resistance.

Ils comprennent, principalement, les dispositions suivantes, qui sont utilisées de préférence en combinaison selon l'ordre d'entrée des composants
On ajoute à l'eau de gâchage et au ciment un silicate hydraté de magnésium de très haute pureté, dans un proportion pondérale comprise entre 15 et 20 % du poids du ciment. Cet agent additionnel améliore la flowabilité du ciment, maintient la barbotine en suspension qui est entraînée dans toutes les cavités du bois, permettant au mélange d'attaquer les fibres à coeur pour les pétrifier lors des échanges chimiques durant la prise du béton.They mainly include the following arrangements, which are preferably used in combination according to the order of entry of the components
A very high purity magnesium hydrate silicate is added to the mixing water and to the cement, in a proportion by weight of between 15 and 20% of the weight of the cement. This additional agent improves the flowability of the cement, keeps the slip in suspension which is entrained in all the cavities of the wood, allowing the mixture to attack the fibers at heart to petrify them during chemical exchanges during setting of the concrete.

On ajoute à ce mélange, dans le malaxeur, une charge de déchets de bois, ou de matière similaire servant d'agrégat, selon la proportion volumique de 200 litres pour 50 kilos de ciment. A load of wood waste, or similar material serving as an aggregate, is added to this mixture in the mixer, according to the volume proportion of 200 liters for 50 kilos of cement.

On ajoute au mélange déjà défini ci-dessus, dans les cas où lton désire obtenir un béton très résistant pour les produits porteurs ou similaires, une proportion de sable fin lavé, ou silice, comprise entre 65 et 75 % de pourcentage pondéral par rapport au poids du ciment. On obtient ainsi un béton mixte végétal-minéral de haute résistance. Is added to the mixture already defined above, in cases where it is desired to obtain a very resistant concrete for load-bearing products or the like, a proportion of fine washed sand, or silica, of between 65 and 75% by weight percentage relative to the weight of cement. A high-strength mixed vegetable-mineral concrete is thus obtained.

Pour obtenir un béton très léger ou béton mousse, on réalise le mélange végétal du béton de base sans apport de silice, on prolonge le temps de malaxage pour obtenir une mousse provenant des bulles d'air contenues dans les pores du bois ou des végétaux, ces bulles restant enfermées dans la barbotine augmentent le volume du mélange et allègent le produit après la prise et le durcissement par séchage naturel. To obtain a very light concrete or foam concrete, the base concrete is mixed without adding silica, the mixing time is extended to obtain a foam from the air bubbles contained in the pores of wood or plants, these bubbles remaining enclosed in the slip increase the volume of the mixture and lighten the product after setting and hardening by natural drying.

Le demandeur a découvert que la remarquable capacité d'absorption et d'a zorption du silicate hydraté de magnésium et sa très faible densité faisaient de cet agent additionnel, le catalyseur préféré dans la composition du béton de bois. The Applicant has discovered that the remarkable absorption and absorption capacity of hydrous magnesium silicate and its very low density made this additional agent the preferred catalyst in the composition of wood concrete.

Selon le produit recherché, on choisira le mode de réalisation pour obtenir un béton végétal ou un béton mixte végétal-minéral ou un béton mousse. Depending on the product sought, the embodiment will be chosen to obtain a vegetable concrete or a mixed vegetable-mineral concrete or a foam concrete.

Claims

1) Insulating vegetable light concrete composed of cement-bound vegetable waste according to the claim of the main patent, nO 7701485 of January 19, 1977, characterized in that it is prepared in the following manner

A very high purity magnesium hydrate silicate is added to the mixing water and to the cement in a proportion by weight of between 15 and 20% of the weight of the cement.

2) Lightweight, highly resistant mixed insulating concrete, characterized in that it is obtained by adding, to the slip defined in claim 1, a proportion of fine washed sand or silica of between 65 and 70% by weight relative to the weight of cement.

3) Concrete according to claims 1 and 2 characterized in that one adds to these mixtures, in the mixer, a load of wood waste or similar material serving as an aggregate in a volume proportion of 200 liters per 50 kilos of cement .

4) Concrete foam, insulating concrete according to claim 1 characterized in that it is obtained by extending the mixing time to evacuate the air contained in the fibers of the plant aggregates, each bubble of this air being coated with slip which retains the air trapped during the setting, the foam obtained creating an expansion of the mixture, thus alveoli makes the dry product very light.