JPS58145654A - Hardenable composition - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] forest This invention relates to a cured body composition, particularly a hydraulic slurry. The present invention relates to a cured body composition mainly consisting of clay and gypsum.

The hardened material, whose main components are hydraulic slag, gypsum, and lime, is made from blast furnace slag, gypsum, and other byproducts, and has superior strength, strength, and water resistance compared to gypsum boards, etc. Recently, it has been attracting attention in this field as a building material. Such a construction material is made of hydraulic blast furnace slag, gypsum, lime, and water in appropriate ratios, generally 100 to 400 parts by weight of gypsum, 0.1 to 5 parts by weight of lime, and 20 parts by weight to 100 parts by weight of blast furnace slag. A fibrous material, a thickener, an antifreeze agent, a foaming agent, a lightweight paste, etc. are added to the formulation at a ratio of ~40 parts by weight, as required, and the mixture is kneaded, extruded,
They are manufactured by hardening molded products formed by various molding methods such as press molding and cast molding by natural curing or steam curing at 90°C or less.

However, when a curable composition is cured by such a method, a large amount of curing time is required before the original strength is developed, which is extremely uneconomical.

In view of the current situation, the present inventors have repeatedly tried to be frugal in order to shorten the curing time, and as a result, they have discovered that the purpose can be achieved by using active alumina hydrate, and have completed the present invention. be. In other words, the invention of Honsilu 1 is hydraulic slag, gypsum, lime...)! Regarding the cured product composition containing activated alumina hydrate as a main component, the present silk 2 invention further adds methylcellulose to the present silk 1 invention to further shorten the curing time and increase the final cured product strength. The present invention relates to a cured body composition.

The activated alumina hydrate used in the present invention is active aluminum hydroxide which is amorphous in terms of X-ray diffraction, or so-called alumina freongel, and can be prepared using a well-known method, for example,
Aluminum chloride, aluminum sulfate, aluminum nitrate, or their basic salts (basic aluminum chloride, basic aluminum sulfate, basic aluminum nitrate), alkali aluminates, organic acids such as formic acid, acetic acid, oxalic acid, citric acid, etc. By adding an alkaline substance such as alkali hydroxide, alkali carbonate or bicarbonate, ammonia, urea (requires heating), etc. to a water-soluble aluminum salt such as a normal or basic salt of
Alternatively, it can be easily produced by hydrolysis of aluminum alcoholate, but the active alumina hydrate of the present invention is not limited to those produced by these methods. Therefore, when the activated alumina hydrate used in the present invention is produced by the precipitation method, this
t may be used as is without being distributed to each household, or if it is a formal event, it may be used by each household. The proportion of activated alumina hydrate to be used varies depending on the composition of the hydraulic slag, the proportion of gypsum and slag used, the proportion of lime used, etc., but it is 0.1 to 5% by weight based on the content of hydraulic slag and gypsum. Good range.

That is, when the lower limit is not /ijl, the effect of the present invention is
I can't wait, and even if I exceed the upper limit, I can't make the curing time that much shorter.

Therefore, the main original 1 used in the present invention, the hydraulic slag, may be any material that has latent hydraulic properties such as blast furnace slag, electric furnace slag, etc., and the one with a specific surface area of 100% is better, but in general, 1, 500 arl, 4 or more, especially 2. ODD~000cn/4 is suitable.

In other words, the curing time is longer for the products below +, soo 嘱.
It is not economical to crush the material more than the oood.

In addition, the gypsum that is main source is trihydrate gypsum, and phosphate gypsum, dehydrated gypsum, and natural gypsum can be used.As for lime, there are quicklime and slaked lime, and slaked lime is especially preferable, and the usage ratio is It is 01 to 5% by weight based on the amount of hydraulic slag and gypsum. Further, the ratio of hydraulic slag and gypsum used in the present invention is 1:2 to 2:0.
1 (the weight ratio is preferably in the range of 0.1 to 60% by weight, based on the nominal amounts of hydraulic slag and stone hanger).

That is, if the amount is less than 0, the effect of the present invention cannot be expected, and even if the amount is added more than 0, no effect commensurate with the added amount can be expected.

Now, the effects of the present invention will be specifically shown as follows.

Specific example 1 High-r slag (Ca04L4) with a specific surface area of 2.4oo4
0%, 5iO135,75%, All0115.19
%, MyO5, 55%.

""! 010.16%), 50 parts of removed gypsum, 1.5 parts of slaked lime, 25 parts of water, activated alumina water reagent obtained by a conventional method from aluminum chloride and ammonium carbonate at 80°C.
Mix a predetermined amount of the dried material, pour it into a 2X2X8LM mold, place it in a thermostatic chamber with a humidity of 95% and a temperature of 50°C, and after curing for a predetermined time, take it out and remove it from the mold.
The bending strength was measured (Invention of this silk 1).

Furthermore, a molded product to which methylcellulose was added was also produced under the same conditions as above, and the strength of the curve was measured (Invention of Honsilu 2).

Comparative examples include one in which no activated alumina hydrate was added, one in which 10 parts of commercially available crystalline aluminum hydroxide was used in place of activated alumina hydrate, and one in which A1. The results of a similar test conducted on a 4.2% aluminum sulfate aqueous solution to which 1.0 part, calculated as AmO1, was added are also shown.

Table 1 ÷ Aol, activated aluminum hydroxide B1. As is clear from the above table of methylcellulose, crystalline aluminum hydroxide has no effect at all, and aluminum sulfate cannot be expected to produce a silky pot with a short curing time.

Embodiments of the present invention will be further explained below.

In addition, %t indicates a single grudge, and all % indicates unit percentage.

Example 1 80 parts of crushed blast furnace slag with the same composition as used in Example 1, 20 parts of phosphoric acid byproduct trihydrate gypsum, 15 parts of slaked lime,
70 pieces of activated alumina water prepared from aluminate and aluminum sulfate by a conventional method and dried at 0°C for 3 hours 2
Mix 0 parts, add 25 parts of water and mix well, then 4X
4Xi6c+uθ) Place in the formwork, humidity 1f 95%, temperature 50
The sample was cured at ℃ for a predetermined period of time, and the bending strength was measured after molding.

The results are shown in the table below.

Table 2 Example 2゜Blast furnace used in Example 1 → 70 parts of lag, 3 parts of removed dihydrate gypsum
0 parts, slaked lime 6 parts, water 25 parts, activated alumina hydrate produced by blowing carbon dioxide into aluminum chloride, and methyl cellulose (Shin-Etsu Chemical Co., Ltd. product name GO8H)
-15000) in the same manner as in Example 2, cured for a predetermined period of time at a humidity of 95% and a temperature of 60°C, and after demolding, the bending strength was measured. The results are as follows.

Table 6 Note) A: Slaked lime B Methyl cellulose C Activated alumina hydrate As is clear from the above table, by using activated alumina water > a and methyl cellulose together, the curing time is further shortened → and the final strength is also increased. It turns out that it does.

Example 6 100 parts of a mixture of 241JO, m/y) and dehydrated gypsum were mixed in the proportions shown in the following table, and activated alumina water oxide (undried material) produced from aluminum sulfate and calcium carbonate was added to 100 parts of a mixture of hlros 7.2%), 18 parts of slaked lime, and 10 parts of water were added and kneaded, and a molded body was produced in the same manner as in Example 1, at a humidity of 95% and a temperature of 80°.
After curing in C for 24 hours, the bending strength was measured and the results are shown in Table 6.

wJ4 Table Example 4 Blast furnace wire slag used in Example 2 (specific surface area 2'100)
80 parts, 20 parts of waste cloth, 1.5 parts of slaked lime, Example 6
1 part of the activated alumina kigumi used in After curing for 48 hours at a temperature of 95% and 50° C.7, it was taken out and cut into pieces of 5.6 x 1.2 x 20 cm, and the bending strength was measured. The resulting ratio i1,75yA
The bending strength was 175 and 97 awards.

The specific gravity of the molded product manufactured under the same conditions as above except that methylcellulose was not used was L75y/cd2.
Bending strength: 141 Ky/arl.

Claims (2)

[Claims] (1) Hydraulic slag, gypsum, lime, and activated alumina 14 A cured composition containing a hydrate as a main component. (2) A hardened/hardened cotton composition whose main components are hydraulic slag, gypsum, lime, activated alumina hydrate, and methylcellulose.