FR2666327A1 - Composition and method of manufacture of a concrete essentially intended for the manufacture of structural units - Google Patents

Abstract

1. Process for the manufacture of cement-based structural units of the building block, plaster work, lintel, support, panel, beam, pool edging, self-blocking paving and slab type, in which the cement contains a filler, characterised by ground coconut fragments treated with the aid of a water-repellent and of bonding product, which are mixed with hydraulic cement and river sand, with the necessary quantity of water, to obtain a pasty concrete which will be dry until completely set.

Description

The present invention relates to a new method of
manufacture of building elements and it extends, from a
on the one hand, to the products obtained, ie to prefabricated construction elements and, on the other hand, to the implementation of these
elements for obtaining constructions with high sound and thermal insulating power having complete homogeneity in particular with regard to their insulating qualities, this is
to say that these constructions do not present thermal bridges
The method of the invention also makes it possible to carry out
light elements, which facilitates their transport, their handling
and their implementation on site.

The particular realization of the elements of the invention
fact that they can be set up following the principles of traditional laying and, when construction is carried out,
interior accessories do not require any sealing.

Indeed, the construction carried out allows fastenings while
quite similar to those used on wood.

An additional advantage of the invention lies in
the fact that the elements that constitute it are non-combustible,
insensitive to atmospheric agents, mold and
insects, which allows them to be used, even in
unhealthy climates.

In accordance with the invention, the method of manufacturing cement-based construction elements of the breeze blocks, slabs, lintels, supports, panels, beams, edges of swimming pools
self-blocking paveq, and slabs in which the cement contains a filler, is characterized in that it prepares coconut shells crushed, in that it treats the result of grinding
using a water repellent, and a bonding product,
and that the product thus prepared is mixed with hydraulic lime strongly baked in the oven (cement) and, a percentage of river sand, until a concrete is obtained, which will be modulated on demand, then dried until fully cured.

 In the method of manufacturing construction elements according to. the invention, firstly crushed coconut shells are prepared, the particle size of which is chosen according to the desired mechanical resistance.

 In a second operation, the crushed coconut shells are coated in a solution of water repellent and adhesion product.

The coating is carried out in a mixer so that the entire surface of the broken pieces is well covered by the mixture of the products mentioned above.
In a third operation carried out either in a kneader or in a concrete mixer, a hydraulic cement (cpj45 or CPA 55) is gradually added to the coconut breakage, which is kneaded with the said breakage for 2 to 4 minutes to obtain that the mass obtained is homogeneous.

 The volume ratio between the broken coconut treated and the cement is of the order of 6 to 1 but can also be modified, for example it can vary more or less in significant proportions depending on whether the product to be manufactured must have more or less high compressive strength characteristics.

 The homogeneous concrete obtained as explained above is then poured into molds of a press in order to obtain construction elements of the desired shape, for example solid blocks, hollow blocks, dehourdis, lintels, supports, panels, beams, paving, edges of swimming pool, self-blocking pavers, or other elements.

By way of example, for the production of concrete blocks, molds of a press are used which exerts a pressure of 5 tonnes on the material contained in the mold.

After demoulding, the concrete block is left to dry in the open air and at room temperature, after a stay of 48 hours in an oven, open at both ends (tunnel)
It has been noted that complete drying is obtained after 30 days, in a temperate climate.

 In an alternative embodiment of the process, crushed and treated coconut shells are prepared as explained above, are then dried and bagged so that they can be used directly on building sites.

 The broken coconuts in sacks to be used on a building site are poured into a concrete mixer and mixed with cement which is also poured into the so-called concrete mixer as well as the quantity of water required.

 After obtaining a pasty mass (concrete), this is used as a binder to ensure the meeting of the various elements mentioned above.

 A homogeneous construction is thus obtained with regard to its composition, the said construction having no thermal bridge since the binder used is then analogous to the products constituting the assembled elements.

Claims (2)

 1 - Method for manufacturing cement-based construction elements of the type of concrete blocks, slabs, lintels, supports, panels, beams, pool edges, self-blocking pavers, and slabs, in which the cement contains a filler, characterized by coconut chips, crushed and treated with water repellent and bonding agent, which is mixed with hydraulic cement and river sand, with the required amount of water, to obtain 'a sticky concrete, which will be dry I used complete hardening.  2- A method according to claim 1, characterized in that the coating of the broken coconut shells is done in a mixer using a water-repellent solution and a bonding product, in the following proportions ,  (8 liters of water repellent + 8 liters of adhesion products, dissolved in 200 liters of water, for the treatment by mixing, of lm3 OF broken coconut shells).