DE2147629A1 - Fiber-reinforced cementitious material and process for its manufacture - Google Patents

Description

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DlPL.-Ir.iG. H. WiiiCKMANil, Di.jl '} ..-- PhVS. Dr. K. FlKCkE

Dipl.-Ing. R A.Weickmann, Dipl.-Chem. B. Huber

XI

8 MUNICH 86, POST BOX 860 820

MÖHLSTRASSE 22, CALL NUMBER 48 3921/22

<983921/22>

(GREAOJ BRII ¹ AIN) LIMITE!)
Bynea Industrial Estate,
Llanelly, Carmarthenshire, England

Fiber-reinforced cementitious material and process for its manufacture

The invention relates to cementitious composite materials and, more particularly, to glass fiber reinforced materials.

The use of glass fiber reinforced Portiand cement and similar materials can lead to a composite material with high tensile strength and flexural strength. In addition, fiber reinforcement reduces the effects of shrinkage that occurs when cement is mixed without the addition of large amounts of additives. 9

It is known to reinforce materials such as resins with glass fibers. The glass is much stiffer than the resin.

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In connection with cement, asbestos fibers are commonly used for reinforcement. Glass fibers are stronger as A? best fibers, but the sizes of the Youngs modules (E) for glass and cement are very different; the cement binder is much stiffer than the glass fibers. This means that the cement already completely cracks or cracks before the glass fibers can provide any effective reinforcement.

The invention is based on the object to provide an improved, reinforced cementitious material in which the P has overcome or at least alleviated the difficulty indicated above.

The object indicated above is achieved by the invention specified in claim 1.

According to the invention, a fiber reinforced cementitious material is formed in that a cementitious material and an emulsion of a rubbery resin are mixed with water and that the mixture is mixed with before setting Glass fibers of a glass is reinforced, which is compatible with the cementitious material.

The rubbery resin reduces the elastic modulus of the structural material, thereby increasing the flexibility of the composite material or composite material improved, whereby the tendency to crack is reduced. The proportion of the cementitious material to the rubbery resin can be changed over a wide range, becomes little rubber is used, the composite material essentially has the property of the cement-like material used, while in the other case the composite material will be a rubber material with a cement filling. For a cementitious

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Composite material, the rubbery resin is preferably used in such a proportion that a solid rubber portion Between 1 and 15 percent by weight based on the weight of the total solids is obtained. Preferably lies the relevant proportion between 5 and 15%.

The strength of the glass fiber reinforcement can be adjusted accordingly can be selected according to the final properties desired in each case.

The cementitious material can be plaster of paris. This material however, as is known per se, it is influenced by water after setting. With plaster of paris, however, glasses are one big thing Range of glasses, usually that is cementitious material, however, a cement such as that used for construction purposes is used, e.g. a Portland cement or a Fozzolana cement or fondu cement or slag cement or water lime. Such cements are essentially alkaline, which is why in this case an alkali-resistant glass or a Glass fiber with a protective cover for the glass fiber reinforcement is to be used. Known fillers can be contained in the cement. Powdered fuel ash is in this one Connection is particularly advantageous as it tends to neutralize the unbound lime, which makes the attack of the Alkali on the glass is decreased. Using sand as a filler reduces costs. To achieve a Light weight arrangement can be used with vermiculite or perlite.

According to another feature of the invention is a method of making a glass fiber reinforced cementitious Material characterized in that a rubbery resin is provided in the mixture, namely

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in such an amount that a Festgujiunianteil between 1 and 15 percent by weight based on the total amount of solids provided is.

Upon its setting, the material has a considerably reduced permeability to water compared to a corresponding composition without the rubber-like resin. The increased flexibility also increases the resistance to frost attack.

It has been found that the gumrai-like resin improves water absorption reduced by the glass fibers · This means that the required water-cement ratio is lower than for a glass fiber reinforced cement without any latex.

The invention also provides a method for producing a glass fiber reinforced cementitious material, which comprises the following process steps: mixing a cement and a rubber latex with water, and zvar with or without a filler, and reinforcement of the mixture before it is set with an alkali-resistant glass fiber. The amount of the rubber latex or rubber-like resin is preferably selected so that a solid rubber component between 1 and 15 percent by weight based on the total amount of solids. The fiber can be added to the Cement-latex mixture can be mixed with a polyethylene oxide gel.

A glass fiber reinforced one is also considered to be within the scope of the invention Consider material made by the above process.

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example 1

The components used in this example are:

50 kg Portland cement 1.5 kg alkali-resistant glass fibers

5 kg synthetic rubber latex with a pesticide content of 55%

5 g polyethylene oxide 15 kg water

The 5 grams of polyethylene oxide powder was formed in a gel with 3 kg of water, with the glass fibers in this gel stirred. The rest of the water, synthetic rubber latex and cement were then put into mixed in a so-called Cumflov insert laboratory mixer to form a uniform potting material. Then vurde the glass fiber and polyethylene oxide combination the latex-cement grouting material added. This mixture was then poured into a mold measuring 1140 mm by 254 mm encapsulated to form a flat plate of 12 mm.

In the wet state, the working properties of the mixture are at a low water-cement ratio much improved. For this particular mixture, the water-cement ratio was 0.35, while a corresponding one Mixing without the latex required a water-cement ratio of 0.6 for adequate workability.

Upon binding, the plate could be bent out by 12 mm in the direction of its longitudinal dimension without breaking. A plate made from a corresponding mixture without the latex tore when deflected by 10 mm.

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The two panels were tested for impact resistance by pulling a 50 g steel ball from a height of 2.5 m dropped on the plates. The panels were supported at two points that were 1 m apart. In the case of the sheet containing the latex the ball in question had to fall six times onto the plate in order to punch a hole through it. In the case of the plate constructed without latex, the ball fell three times onto this plate, which then tore across its width.

P example 2

A plate was made in the manner described in Example 1 using the following ingredients: 50 kg cement (Portland Aberthaur)

15 kg rubber latex (Revertex 29 Y 40),

synthetic, with 55% pesticides

2 kg of alkali-resistant glass fibers 10 kg of water
5 g polyethylene oxide

Example 3

A plate was made in the manner described in Example 1 manufactured with the following components:

25 kg cement (Portland Aberthaur) fine quartz sand

Rubber latex (Revertex 29 Y 40), synthetic, with 55% pesticides

alkali-resistant glass fibers water polyethylene oxide

Example 4

A plate was produced in the manner indicated in Example 1 using the following components:

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15th kg 10 kg 2 kg 7th kg 7th G

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25 kg cement (Portland blue circle) 25 kg fine quartz sand

2 kg rubber latex (natural rubber latex with 60% rubber solids)

2 kg of alkali-resistant glass fibers 8.5 kg of water

5 g polyethylene oxide

Checks of these and other panels showed that the addition of latex was between 1 percent and 5 percent by weight of the solids has a remarkable effect on the workability of the composition showed. In addition, there was a remarkable effect on impact resistance and flexural strength. Above 5%, the effect on impact resistance, flexibility and flexural strength was even more significant. An improvement by a factor of 4 or 5 was achieved with a rubber content of 10 to 15%.

Furthermore, water can be added to the mixture in order to carry out injection processes or injection molding or extrusion will. When using a spraying process, ts It may be more expedient to spray the glass fibers with a mixture of other ingredients at the same time. Because of the use of rubber latex, the material has a dough-like consistency before setting, which is why it is without significant separation of the water can be processed or processed.

For the production of panels, the material in question can be processed in a smoothing process.

Sand can be used as a filler. To a light arrangement Vermiculite or pearlite can be used to achieve this.

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Claims (9)

_, _ · 2H7629 S Claims Fiber-reinforced cementitious material, characterized in that it is made by mixing a cementitious material and a rubber latex emulsion with water and that the mixture is reinforced with glass fibers of a glass before it sets, is compatible with the cementitious material. 2. Fiber-reinforced zea-like material according to claim 1, characterized in that the cementitious material is plaster of paris. 3. Fiber-reinforced cementitious material according to claim 1, characterized in that the cementitious material a Portland cement or a Pozzolana cement or a Fondu cement or a slag cement or water lime and that the glass is an alkali-resistant glass. 4. Fiber-reinforced cement-like material according to one of claims 1 to 3, characterized in that a filler is provided, 5. Fiber-reinforced cementitious material according to one of the Claims 1 to 4, characterized in that the amount of rubber latex is chosen so that a solid rubber content between 1 and 15 percent by weight based on the Amount of solids is achieved. 6. A method for producing a glass fiber reinforced cementitious material, in particular according to one of the Claims 1 to 5, characterized in that a hybrid of a cementitious material and a Gumrailatex is produced, which in such a 209814/1516 Amount of the mixture in question is added so that a pest gum content between 1 and 15 percent by weight based on the total amount of pesticide achieved is. 7. The method according to claim 6, characterized in that if necessary, a filler is added to the mixture and the mixture is reinforced with an alkali-resistant glass fiber before it sets. 8 · The method according to claim 7 »characterized» that the amount of rubber latex is chosen so that a pest rubber content between 5 and 15 percent by weight based on the total amount of pesticides is obtained. 9. The method according to claim 7 or 8, characterized in that that the glass fiber is mixed with a polyethylene oxide gel before it is added to the cement-rubber latex mixture. , ^ 20 9-8 U / 161 6