Title of Invention

A PROCESS FOR THE PREPATRATION OF AN IMPROVED LIGHT WEIGHT AERATED CONCRETE MATERIAL

Abstract This invention relates to a process for the preparation of an improved light weight aerated concrete material comprising in the steps of preparing a slurry in a conventional manner by mixing of known cementious material with silicious material, characterized in that is a fibrous material as herein described being added to said slurry, adding an aerating agent such as aluminium powder to said slurry resulting in a release of hydrogen gas and thereby extending the mass to form the aerated concrete material.
Full Text FIELD OF INVENTION
This invention relates to a process for the preparation of an improved light weight aerated concrete material.
BACKGROUND OF INVENTION
In the known art, cement and siliceous materials mixed with water is made into slurry. To the slurry so prepared is added aerating agents such as aluminum powder. The addition of aerating agent in the slurry results in release of hydrogen gas and hence the mass of slurry in the tank rises as the gas produced exerts pressure to extend the mass and these air bubbles generated are trapped in great numbers to form cellular structure.
When density is lower, there is less connectivity between the mass and air bubbles resulting in collapse of mass and hence avoids/bigger air pockets, resulting in poor strength where bigger air pockets exist.
OBJECTS OF THE INVENTION
An object of this invention is to propose an improved light weight aerated concrete material.
Another object of this invention is to propose an improved light weight aerated concrete material, which has a reduced density.
Still another object of this invention is to propose an improved light weight aerated concrete material, which has a reduced weight.
Yet another object of this invention is to propose an improved light weight aerated concrete material, which minimizes or avoids large air bubbles/air pockets in the structure of aerating concrete material and hence avoid a weak aerated concrete material.
A further object of this invention is to propose an improved light weight aerated concrete material, which is cheap in costs.
DESCRIPTION OF INVENTION
According to this invention there is provided a process for the preparation of an improved light weight aerated concrete material comprising in the steps of preparing a slurry in a conventional manner by mixing of known cementious material with silicious material, characterized in that is a fibrous material as herein described being added to said slurry, adding an aerating agent such as aluminium powder to said slurry resulting in a release of hydrogen gas and thereby extending the mass to form the aerated concrete material.
In accordance with this invention, the improved aerated concrete material is prepared by adding to the slurry prepared in conventional manner by mixing cementious material with silicous material an organic or inorganic fibrous material to assist in pushing of slurry up due to bridging of the gap of mass of material and trapped air bubbles and hence reduce density and minimise or avoid bigger air pockets. By way of example and without implying any limitation thereto, the organic or inorganic fibrous material used is mineral wool rock cool or wood fibres.
The addition of fibrous material is 0.25 to 0.50% of total mass of material.
The invention overcomes this phenomena of collapse of loosely connected mass and trapped air bubbles by addition of fibrous materials.
Fibrous material as low as 0.25 to 0.5% of total mass when added while mixing cement and silicious material improves the ability of aerating agent to push the material up, due to fibrous bridging of the mass particles with air bubbles in all directions and hence reduce collapsing probability and avoiding of larger air pockets. Further, this phenomenon of bridging ability of fibrous material with mass and air bubbles apart from avoiding of larger air pockets due to increase in the pushing capability of the aerating agent and resulting formation of more cellular structures results in lower density. This also further reduce the consumption of expensive aerating agent such as aluminium powder and reduce the cost of the product.
Further objects and advantages of this invention will be more apparent from the ensuing
example.
EXAMPLE
DAT AS USING 0.5% MINERAL FIBRE IS AS FOLLOWS:
1) Batch Weight (in Kgs.) : 1600 1600 1600 1600
2) Al. Powder (in Kgs.) : 1.7 1.40 1.4 1.7
3) Mineral Wool (in Kgs.) : 0.0 8.0 8.0 8.0
4) Density (in Kg/cubic metre) : 545 520 523 505
5) Flexural Strength (N/mm2) : 0.70 0.90 10.85 0.80
6) Compr. Strength in (N/Sq.Mtr): 3.2 3.9 3.6 3.5
The data indicates reduction of density upto 8%, hence production cost per cubic metre is reduced apart from improved flexural strength and compressive strength. Further due to reduced air pockets rejections are reduced.
The above is typical formulation. By changing combination of Aluminum powder and reinforcing fibres desired improvement in density flexural strength, compressive strength or any combination as required for specific product application can be obtained.
The slurry of instant invention when poured between two facing sheets held rigidly and closed from all direction will result in improved aerated concrete panel resulting better bonding between facing sheets and aerated concrete material because of increased
^
surface area of contact due to lesser air pockets.




CLAIM;
1 . A process for the preparation of an improved light weight aerated concrete material comprising in the steps of preparing a slurry in a conventional manner by mixing of known cementious material with silicious material, characterized in that is a fibrous material as herein described being added to said slurry, adding an aerating agent such as aluminium powder to said slurry resulting in a release of hydrogen gas and thereby extending the mass to form the aerated concrete material.
2. A process as claimed in claim 1 wherein the fibrous material is an
organic or inorganic fibrous material.
3. A process as claimed in claim 1 wherein said fibrous material is
selected from mineral wool, rock wood or wood fibres.
4. A process as claimed in claim 1 wherein said fibrous material is
present in an amount of 0.25 to 0.50% of total mass of material.
5. A process for the preparation of improved light weight aerated
concrete material substantially as herein described and illustrated
in the examples.
6. An improved light weight aerated concrete material whenever made
by the process as claimed in claim 1 .

Documents:

1139-DEL-2001-Abstract.pdf

1139-DEL-2001-Claims.pdf

1139-del-2001-correspondence-others.pdf

1139-del-2001-correspondence-po.pdf

1139-DEL-2001-Description (Complete).pdf

1139-DEL-2001-Form-1.pdf

1139-del-2001-form-18.pdf

1139-DEL-2001-Form-2.pdf

1139-DEL-2001-Form-26.pdf

1139-del-2001-form-3.pdf

1139-del-2001-form-5.pdf


Patent Number 241617
Indian Patent Application Number 1139/DEL/2001
PG Journal Number 30/2010
Publication Date 23-Jul-2010
Grant Date 15-Jul-2010
Date of Filing 12-Nov-2001
Name of Patentee VANAGALA PATTABHI
Applicant Address INDIAN NATIONAL OF HIMALAYA HOUSE, FIRST FLOOR, 23 KASTURBA GANDHI MARG, NEW DELHI-110001
Inventors:
# Inventor's Name Inventor's Address
1 VANAGALA PATTABHI INDIAN NATIONAL OF HIMALAYA HOUSE, FIRST FLOOR, 23 KASTURBA GANDHI MARG, NEW DELHI-110001
PCT International Classification Number C04B 14/18
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 NA