AU4379900A

AU4379900A - Building materials

Info

Publication number: AU4379900A
Application number: AU43799/00A
Authority: AU
Inventors: Paul Francis Mclaughlin; Russell James Wombey
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-07-02
Filing date: 2000-07-03
Publication date: 2001-01-04

Description

V

AUSTRALIA

Patents Act 1990

ORIGINAL

COMPLETE

SPECIFICATION

STANDARD

PATENT

In enin ile XT R The following statement is a full description of this invention, including the best method of performing it known to me:- 2 BUILDING MATERIALS The invention relates to materials suitable for use in the building and construction industries. In particular, the invention relates to cementitious materials having binding properties which make the materials suitable for a variety of uses in those industries. As one option, the materials may be supplied as a dry mix which, on addition of water, become a soft, pliable, paste-like substance which later sets into a hard mass. It is also possible to mix the dry ingredients in situ before adding water.

°o It is an object of the invention to provide multi-purpose cementitious building materials.

According to the invention, the building materials are made from glass a fibre reinforced cementitious material and a filler.

A principal ingredient of the building materials is a general purpose cement in the form of a fine powder. The cementitious ingredient with the later addition of water will form the main binding agent of the building materials.

The building materials may include one or more fillers. The principal filler ingredient is sand in the form of a fine aggregate, for example, grade 50 N. Finer grades may be used some applications. Preferably, the building materials also include as a filler crystalline 3 calcium carbonate which is commercially available under the name Omyacarb 10. Talc, which is a mineral based filler may also be included as a minor ingredient.

Another preferred minor ingredient of the building materials is sodium carboxymethylcellulose which is commercially available under the brand C.M.C 7HF.

This ingredient acts as a thickener, a binder and a suspending aid.

A further preferred minor ingredient of the building materials is aluminium stearate which acts as a waterproofing agent.

The reinforcing agent is an alkaline resistant chopped strand glass fibre such as is commercially available under the brand CEM-FIL 12 CEM 60/2 or under the brand 10 NEC 350Y/13.

The qualification "minor ingredient" means the is less than 5% by weight of the building material.

Thus, the building materials of the invention include the following ingredients in the proportions indicated 1. Sand 35% to 2. Cement 38% to 3. Crystalline calcium carbonate 10% to 4. Talc 0.05% to 1.50% Aluminium stearate 0.10% to 0.50% 6. Sodium carboxymethylcellulose 0.095% to 0.105% 7. Alkaline resistant chopped strand glass fibre 2% to 3%.

A preferred composition is as follows 1. Sand 39.76% 2. Cement 42.24% 3. Crystalline calcium carbonate 14.17% 10 4. Talc 0.99% Aluminium stearate 0.25% 6. Sodium carboxymethylcellulose 0.099% 7. Alkaline resistant chopped strand glass fibre 2.49%.

The above percentages refer to the weight of the ingredients.

99 9 Preferably, the dry ingredients are mixed in a mechanical mixer such as a ribbon mixer or a planetary mixer. With the mixer operating, the first six of the above mentioned ingredients are added, preferably in the order indicated. The ingredients are mixed for a sufficient time to obtain a substantially homogenous mix, say, for about four minutes.

When a substantially homogenous mix is obtained, the alkaline resistant chopped strand fibreglass is added to the operating mechanical mixer so that it will become evenly distributed throughout the mix. The mixing time to achieve even distribution of the glass is not critical and may be about four minutes.

At this stage, the product may be packaged as a dry mix, in any convenient quantity.

In use, water is added slowly to the dry mix, preferably while it is agitating in a mechanical mixer. The amount of added water is about 4 to 8 litres per 20 Kg of dry mix.

It has been found that an optimum amount of water is about 6 litres per 20 Kg of the preferred dry mix. The amount of water added is such that a paste-like texture is achieved.

The building materials of the present invention are adapted for a variety of uses in the 10 building and construction industries, either alone or in association with other components.

0000 For example, in a soft, pliable and paste-like condition, the materials may be used as a grout or as a surface render. In a similar condition, the materials may also be used as a binding agent for bricks, rocks or stones in the construction of, for example, a wall.

Again, the materials may be used in the manufacture of structural items such as sheets, blocks, rods, pipes, tanks and other factory made products. In situ applications of the materials, in association with a coarse aggregate, include the laying of building floor slabs and foundations, walkways, roadways and so on. The mentioned uses are merely illustrative and should not be regarded as a limitation.

6 In a soft pliable and paste-like condition, the materials may be applied manually or with the aid of mechanical means such as a spray.

**o *°OoO#* *o o *oo

Claims

1. Building materials suitable for use as a binding agent in the building and construction industries comprising glass fibre reinforced cementitious materials and a filler.

2. Building materials as claimed in Claim 1, wherein the principal filler is sand.

3. Building materials as claimed in Claim 2, wherein the filler also includes crystalline calcium carbonate. S

4. Building materials a claimed in Claim 2 or 3, wherein the filler also includes talc as a minor ingredient. 10 5. Building materials as claimed in any preceding claim, wherein the building materials also include sodium carboxymethylcellulose as a minor ingredient.

6. Building materials as claimed in any preceding claim, wherein the building materials also include aluminium stearate as a minor ingredient.

7. Building materials as claimed in any preceding claim, wherein the glass fibre is an alkaline resistant chopped strand glass fibre.

8. Building materials according to Claim 1, include the following ingredients in the weight proportions indicated 1. Sand 35% to 2. Cement 38% to 3. Crystalline calcium carbonate 10% to 4. Talc 0.05% to 1.50% Aluminium stearate 0.10% to 0.50% 6. Sodium carboxymethylcellulose 0.095% to 0.105% 7. Alkaline resistant chopped strand glass fibre 2% to 3%. a cov 94 0 0.00

99.0 *5 0 Poe* 00C* be S *00 0 0 S 0 10 9. Building materials according to Claim 1, including the following ingredients in the weight proportions indicated 1. Sand 39.76% 2. Cement 42.24% 3. Crystalline calcium carbonate 14.17% 4. Talc 0.99% Aluminium stearate 0.25% 6. Sodium carboxymethylcellulose 0.099% 7. Alkaline resistant chopped strand glass fibre 2.49%. DATED this day of JUNE 2000. PAUL KILDEA Patent Attorney for the Applicant.