FR2561235A1 - Fibre cement panels for use in building construction - Google Patents

Abstract

Fibre cement product characterised in that it is made of piassava vegetable fibre and CPA cement for use in construction in the building industry. Fibre cement in the form of panels of different thicknesses 1.5, 2, 3, 4 and 5 cm and 0.50 x 1.00 m and 0.50 x 2.00 m in size. The fibre cement is pressed through moulds by a press.

Description

DESCRIPTION The present invention relates to a fiber cement for use as building material in the building.

The essential elements are the piassava plant fiber, and the CPA cement. This building material is in the form of plates or panels 1.5 cm to 5 cm thick and dimensions lm X 0.50 and 2 m X 0.50.

the use of certain traditional building materials has disadvantages - the cement agglomerate "said block": high density, implementation
costly work and transport, high weight of a built building
with this material, mancue of thermal and acoustic insulation.

- agglomerates based on glue and wood fiber or cane
sugar: are very putrescible, sensitive to moisture and
hermits.

- the plywood, the isorel: are also materials ins
tables in tropical sone.

galva tle: very used in the tropics, also present
the disadvantage of poor thermal and acoustic insulation.

 The present invention relates to fibro-cement, advantageously replaces traditional materials and provides an answer to their disadvantages. fibro-cement ensures good sound and heat insulation, keeps hot or cold inside the building. This material stabilized by a chemical stabilized piassava fiber, is stable in tropical atmosphere, has a low density (a building weighs 5 to 7 times less), a flammability, an imputrescibilité due to the acid characters of the fiber itself, and good mechanical strength.

The fibers of the present invention are used according to the following process.
They are effectively cleansed and combed, free of potential noeux, which can cause cement cores altering at the same time the characteristics mentioned above.

Thus freed from their negative elements, they are soaked in a tray filled with water (200 liters and more depending on the desired production) added with 5 .mu.m magnesium sulfate (stabilizing agent).

After 2 hours of quenching, the fibers are removed from the bath and deposited on the ground. They are powdered with C.P.A. cement. The quantity of cement must be limited to the right coating of the horsehairs so as not to cause the formation of nuclei that can alter the characteristics mentioned above.

After spraying, the fibers wet and coated with cement C.P.A.

are introduced into mold frames. the dimensions and thickness of these molds, are dependent on customer demand. These molds of wood or metal, are of rectangular or square section, depending on the desired thickness of the material used. They are separated from each other by plywood of good thickness, and the same size. These plywoods provide support and dissociation of the fibro cement during manufacture. the molds are placed one on the other respecting the order of assembly, and all put in press.

Two upper and lower frames in UPN, previously enclosing the assembly, will serve as a relay to the press, releasing it for a second sequence.

These two UPN iron frames, will maintain the pressure off press by screws to opposite pitch.

After drying at room temperature, the formwork and storage may take place.

Description of Figures No. 1: combs for cleaning fibers.

 NO 2: fibers in the water tank with 5 ffi of S. de M.

 NO. 3: fiber powdering.

NO 4: the molds (A)
the use of fiber cement (C)
the plywood (B)
iron frames UPN (E) NO 5: the set of molds (A)
fiber cement (o)
against plated (B)
frame in UPN (E) and press NO 6: the set of molds (A)
fiber cement (C)
against plated (B)
UPN iron frame (E) and clamping screw.

 # 7: cut of a mold NO 8: a fiber cement board.

Fibro-cement based on piassava fibers can be used as slab formwork, and therefore be used directly for the manufacture of acoustic and thermal ceilings.

It can replace the benchtop concrete, and used for internal and external partitions (with possibility of double wall with air mat in the center) for palisades, awnings, verandas barriers, cupboards, trellises, flower boxes, in architecture and decoration, for isothermal panels for roofs made of concrete slabs.

Claims (2)

1 / Fibrocement product characterized in that it is made of plant fiber piassava and CPA cement, the construction wise in the building. Fibro-cement in the form of panels of different thicknesses 1,5 - 2 - 3 - 4 - 5 cm, and dimen sions 0,50 X 1,00 m and 0,50 X 2,00 m. 20 / A method according to claim 1 characterized by the use of  combs for cleaning fibers Fig. 1.  30 / A method according to claim 1 and 2 characterized by immersing  plant fiber in a 5% sulphate water bath  of magnesia for about 2 hours. 40 / A method according to any one of the preceding claims  characterized by the metering of CPA cement. 3  (outside the bath) 5 / A method according to any one of the preceding claims  characterized by the use of rectangular molds of diffe  thicknesses and interlayer plywood Fig. 4. 60 / A method according to any one of the preceding claims  characterized by pressing the fibro-cement through  molds, exerted by a press Fig 5.