JPS5932419B2 - ALC repair material composition - Google Patents

Description

Detailed Description of the Invention The first invention of the present invention is a repair material composition for lightweight aerated concrete (hereinafter referred to as ALC) cured with high-temperature and high-pressure steam, and the second invention of the present invention is a high-temperature and high-pressure steam-cured repair material composition having waterproof properties. The present invention relates to a repair material composition for cured lightweight cellular concrete.

ALC (Autoclaved Light)
Ght concrete is generally a slurry mainly composed of finely ground silicic acid and lime, mixed with a foaming agent such as metal aluminum powder, and injected into a mold, and after reaching a semi-hard state, it is demolded. Cut and divide into predetermined shapes,
Furthermore, it is a building material obtained by curing under high temperature and pressure in an autoclave, and is widely prized as an exterior wall and roofing material for its light weight, heat insulation, fire resistance, and workability.

In addition, waterproof ALC is manufactured by mixing water-repellent substances and film-forming substances into raw materials, and in addition to the above-mentioned characteristics of ALC, it also has waterproof properties, and has been widely praised especially for exterior wall materials. It's been a month.

The water-repellent substances herein include, for example, solid paraffin, fluorine compounds, silicone thread oil and modified products thereof, zirconium compounds, fatty acids and compounds thereof, carboxylic acids and compounds thereof, and the like.

Film-forming substances include styrene and its copolymers, butadiene and its copolymers, polyethylene and its copolymers, polypropylene and its copolymers, acrylic esters and its copolymers, vinyl acetate and its copolymers. , etc.

When installing ALC and waterproof ALC, it is essential to repair parts where holes have been drilled (for mounting metal fittings) or parts missing for installation.

Conventional ALC repair material compositions include portland cement and ALC powder and/or pearlite mainly made from pearlite in a volume ratio of 1:3, and ALC powder and pearlite made from pearlite as raw materials. The volume ratio of 1=2 was used.

Repair materials made with such a composition had the disadvantage of being inferior in workability compared to ALC.

For example, when cutting the repair material after it has hardened, the AL
It was difficult to obtain a surface quality similar to that of C, or the repaired part was prone to cracking during nailing.

Furthermore, since a large amount of ALC powder and perlite made from perlite, which have high water absorption properties, are used as aggregates, more water is required for mixing than when using aggregates that do not have water absorption properties. As a result, the cure and drying shrinkage of the repaired area was large, causing problems such as cracks occurring at the interface between the repaired area and ALC, and the repaired area peeling off. ○ The above-mentioned waterproof ALC repair materials are recommended. These ALC repair materials are only mixed with liquid or powdered water repellent, and the problems of conventional ALC repair materials have not been improved in any way.Furthermore, liquid water repellent cannot be uniformly mixed with the raw material powder in advance, which is unfavorable in terms of workability.

Therefore, the present inventor developed the above-mentioned ALC repair material and waterproof ALC.
Results of intensive study to solve problems with LC repair materials・A
The LC repair material composition contains 16 to 18 parts by volume of non-water-absorbing pearlite made from obsidian, 48 to 53 parts by volume of water-absorbing pearlite made from pearlite, and 16 to 16 parts by volume of ALC powder. The inventors have found that the above-mentioned problems can be solved by adding 18 parts by volume and 20 to 11 parts by volume of Portland cement, and have completed the present invention.

In addition, the waterproof ALC repair material composition includes 16 to 18 parts by volume of non-water-absorbing pearlite made from obsidian, and 4 parts by volume of water-absorbing pearlite made from pearlite.
8 to 53 parts by volume, 16 to 18 parts by volume of ALC powder, and 20 to 11 parts by volume of Portland cement. By adding ~8% by weight,
It was discovered that the above-mentioned problems could be solved and a repair material having a water absorption rate comparable to that of waterproof ALC could be obtained, and the present invention was completed.

The term "Portland cement" as used herein refers to white Portland cement and/or Portland cement defined in JIS R5210-1973, particularly preferably one mainly composed of white Portland cement.

Furthermore, it is preferable for the ALC powder to have a maximum particle size of 1.2 mm or less in terms of performance.

Perlite that does not have water absorption properties and is made from obsidian is 16
If it is smaller than the volume part, a large amount of kneading water is required to obtain sufficient workability, and cracks due to hardening and drying shrinkage are likely to occur.
Moreover, cracks occur in the repaired part during nailing, which is undesirable.

Further, if the volume is larger than 18 parts, it is not preferable because surface smoothness cannot be obtained during finishing with a trowel.

If the water-absorbing pearlite made from pearlite is smaller than 48 parts by volume, it will be difficult to obtain a surface texture similar to that of ALC, and if it is larger than 53 parts by volume,
In order to obtain sufficient workability, a large amount of kneading water is required, which is undesirable because hardening and drying shrinkage increases.

If the ALC powder is smaller than 16 parts by volume, it is undesirable because the appearance of the cut surface is significantly different from ALC, and
If it is larger than 18 parts by volume, curing and drying shrinkage will increase, which is not preferable.

If the Portland cement is larger than 20 parts by volume, hardening and drying shrinkage will be large and machinability will be poor.

If it is less than 11 parts by volume, strength comparable to that of ALC cannot be obtained, which is not preferable.

It has been found that the formulation of the present invention provides a repair material with excellent performance.

Liquid water repellents are not preferred because they inhibit curing of the repair material and do not provide uniform waterproofing properties when mixed with raw materials in advance.

As a powder water repellent, divalent and/or trivalent fatty acid metal salts are preferred because they are inexpensive and have a large waterproofing effect.If the amount added is less than 2% by weight, waterproof properties cannot be obtained; If it is larger than 15% by weight, the hardening of Portland cement 15 is very harmful and is not preferred.

Furthermore, in the repair material according to the present invention, various powdered admixtures used in mortar and concrete, such as thickeners such as methyl cellulose, water reducers, and early strengthening agents such as pozzolanic materials, etc. can also be used in combination.

The present invention will be further explained below with reference to Comparative Examples and Example 1.

Comparative Examples and Examples Pearlite made from obsidian is manufactured by Toho Perlite Kogyo 7F, pearlite made from pearlite is Ube Perlite No. 1 manufactured by Ube Industries, and ALC powder is crushed to a particle size of 12 mm or less. White cement was used as the powder and Portland cement.

For all samples, Matsumoto Yushi Pharmaceutical Co., Ltd.
0.5% by weight of Marporose M4000 was added to the cement.

In addition, as the fatty acid metal salt, aluminum stearate, which is a grade 1 reagent, was used.

Table 1 lists the composition and various performances of the repair material that was prototyped.

Claims (1)

[Scope of Claims] 1. A lightweight product made of 16 to 18 volume parts of non-water-absorbing pearlite made from obsidian and 48 to 53 volume parts of water-absorbing pearlite made from nacre, cured with high-temperature and high-pressure steam. A repair material composition for ALC, comprising 16 to 18 parts by volume of aerated concrete powder and 20 to 11 parts by volume of Portland cement. 2 16-18 volume parts of non-water-absorbing pearlite made from obsidian, 48-53 volume parts of water-absorbing perlite made from pearlite, and 16-16 volume parts of lightweight aerated concrete powder cured with high-temperature and high-pressure steam. A composition containing 18 parts by volume and 20 to 11 parts by volume of Portland cement is characterized in that at least one type of powder of a fatty acid salt of a divalent and/or trivalent metal is added in an amount of 2 to 8% by weight. A repair material composition for ALC that has waterproof properties.