JPS6032878A - Breaking agent incorporated with slag for brittle matter - Google Patents

Abstract

PURPOSE:To obtain low-cost titled agent capable of gradually and linearly developing expansive force, also with ultimate high-level expansivity, by incorporating blast furnace slag powder in a pulverized sintered matter prepared from calcareous material containing copper compound. CONSTITUTION:(A) 100pts.wt. of a pulverized sintered matter prepared from a calcareous material containing, in the post-calcination stage, both copper and iron compounds so as to be 0.1-0.2wt% on a CuO basis and 0-2.5wt% on a Fe2O3 basis is blended, if required, with (B) <=30pts.wt. of gypsum. Subsequently, 100pts.wt. of the resulting mixture is incorporated with (C) 50pts.wt. of blast furnace slag powder with a Blaine specific area 2,000-8,000cm<2>/g, thus obtaining the objective breaking agent. EFFECT:Easy to set processing condition. Capable of developing expansive force at any rate according to regulating its components. Giving good workability.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a destructive agent for brittle objects that utilizes the expansion force accompanying the hydration of quicklime.

Conventional methods for destroying concrete IJ structures and rocks include methods using mechanical shock from the outside and methods that utilize the explosive power of explosives or the like.

However, these methods have problems with safety, noise, pollution such as dust or vibration, and hygiene, and static destruction methods using expansive destructive agents are often used to solve these problems. The button has turned to be used.

What is the expansive destructive agent used in this static destructive method?

Various types of destructive agents have been proposed, each of which utilizes the expanding force normally associated with the hydration of calcium oxide.

Among these destructive agents, a destructive agent whose main component is copper oxide or a calcium oxide sintered body containing copper oxide and iron oxide is known to quickly develop a high expansion pressure.

However, since the hydration of calcium oxide occurs in a relatively short period of time, excess water evaporates due to the generation of a large amount of water heat, and its vapor pressure reduces the filling pore force of the object to be destroyed.・The filler may blow out from the inside, and the expansion pressure is concentrated at a relatively early stage, so it is difficult to design it all at once.・The present invention improves these drawbacks. The inflation pressure can be developed gradually and linearly. Moreover, it relates to a rupturing agent that can provide a large final expansion pressure.

The destructive agent of the present invention is O
A sintered body obtained by sintering a calcareous raw material containing a copper compound and an iron compound in a ratio such that it contains 61 to 0.2 wt% of a copper compound and 25 wt% or less of an iron compound in terms of Fe, O31c. Add to 100 parts by weight of the crushed material.

By comparison, 10 parts of gypsum mixed with 30 parts by weight or less
Blaine specific surface area 2000-8000 for 0 vine weight part
This is a destructive agent for brittle objects containing 50 m/f of blast furnace slag powder weighing 6i or less.

This type of destructive agent destroys objects by applying the expansion pressure associated with the water use reaction of its main component, calcium oxide, but the speed of the water reaction σ) depends on the temperature at the time of operation. Since there is a wide difference, it is necessary to adjust the addition t of the copper compound and iron compound depending on the use of f so as to obtain the desired reaction rate and expansion pressure.

In the destructive agent of the present invention, the copper compound has the effect of promoting the crystal growth of calcium oxide during sintering, suppressing the initial rapid water use reaction, and improving the fluidity of the slurry during construction. If the content is less than 0.1 wt%, a sufficient effect cannot be obtained, but it is not necessary to exceed 0.2 wt%. The iron compound contained in the casing has the effect of suppressing the water use reaction, and is used for work at the same temperature where the effect of suppressing the water use reaction is insufficient if the copper compound alone is used. It becomes difficult to obtain a sufficient expansion pressure.

One of the characteristics of the destructive agent of the present invention is that powdered furnace slag k t'N is added to the calcium oxide sintered body containing the above-mentioned copper and ferrite. By adding blast furnace slag powder, the early development of expansion pressure is suppressed, and as shown in Figure 2.3, the trap expansion pressure gradually appears in a form close to that of a peak, and the final It is possible to obtain a larger expansion pressure than when no additive is added. The amount of slag to be added is determined by the performance of the destructive agent required depending on the purpose of use and conditions of use, but it is usually 100% of the components other than slag (5 to 50% Heavy gong S is suitable.If it is less than 5 parts by weight, the effect will be small, and if it exceeds 5014 parts by weight, sufficient expansion pressure will not be obtained.Furthermore, even if the slag powder used is fine, it will have a great effect.

Since energy is lost during crushing, the Blaine specific surface area is 20.
00 to 8000 dl/f is practical. The blast furnace slag used here is increasingly being rapidly cooled slag, which is water-cooled slag generated from steel blast furnaces.

The addition of blast furnace slag powder is the key to controlling the expansion pressure development.
It is also effective in improving workability, such as improving the fluidity of slurry during work, and reducing manufacturing costs.

The destructuring agent of the present invention is made into a product by mixing the above-mentioned main components and adding a water reducing agent, a fluidizing agent, etc. as necessary. Gypsum may be added to increase the self-hardening property of the casing-destroying agent and to adjust the timing of expansion pressure and pressure development accompanying the hydration reaction. The amount of gypsum added is 30 parts by weight or less per 100 parts by weight of the constituent components before adding the madder furnace slag powder, and if it exceeds 30 parts by weight, defects such as a significant decrease in expansion pressure will occur.

The destructive agent of the present invention increases the expansion pressure slowly and legally, so it is easy to set the construction conditions, and the expansion pressure can be developed at any speed by adjusting the ingredients. . Furthermore, workability such as the fluidity of the slurry during construction is improved, and since blast furnace slag, which is an inexpensive raw material, can be used, manufacturing costs can be reduced. I will explain in detail.

In addition, the expansion pressure in Examples was measured by the following method.

[Measurement method of inflation pressure]

The inflation pressure was measured using the apparatus shown in FIG.

In Figure 1, a person has an inner diameter of 36, a thickness of 17n, and a height of 1.
A pressure transducer B is inserted from the side of a 50-inch steel tube, and its head passes through the inner wall of the tube. Destruction 300f
A steel pipe is filled with a sample prepared with water at 90F, and its expansion pressure is measured at PIT foot temperature.

Example 1 0.08 parts by weight of copper oxide was added to 100 parts by weight of limestone, mixed, crushed, fired at 1200° C. for 2 hours, cooled, and crushed into a powder having a Blaine specific surface area of 2500 cJ/f. 1 part by weight of gypsum was added to 100 parts by weight of this pulverized product, and 20 parts by weight of blast furnace slag which had been powdered to a predetermined degree of fineness was added and mixed to obtain a product. Table 1 and Figure 2 show the results of measuring the development of expansion pressure σ) on the buttons of these products. Copper oxide 0.0 instead of
8 parts by weight and 0.15 parts by weight of iron oxide were used to prepare the destructive agent frrM in the same manner, and the development of swelling pressure was measured for these samples. The results are shown in Tables 2 and 3.
As shown in the figure.

・Measurement temperature: 20℃ Example 3゜Actual @'r Same as Example 1 θ) method, the amount of blast furnace slag used (
Table 3 shows the results of investigating the influence of the amount of blast furnace slag added by manufacturing different destructive agents. The blast furnace slag has a Blaine specific surface i9i 6000cll/? Table 3 ρ Measurement Temperature 10°C Example 4 A sufficient amount of oxidized steel and iron oxide were added to 100 parts by weight of crushed limestone and mixed and molded.

After firing at 1200° C. for 2 hours, the mixture was cooled and ground to a powder having a Blaine specific surface area of 2500 crl/f. P9T amount of gypsum is added to 100 parts by weight of this crushed product, plain ratio table I
IIJ product 6000c#! /PK pulverized crystal furnace slag powder and a water reducing agent were mixed to make a product. Table 4 shows the results of measuring the development of expansion pressure for these products. It can be seen that by adjusting the Ik of each relative molecule, it is possible to obtain a destructive agent that has good performance when working at various temperatures.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an expansion pressure meter for measuring the expansion pressure of the destructive agent of the present invention. In Figure 1, A represents the measurement container and B represents the pressure transducer. FIG. 2 and FIG. 3 are graphs showing the development of swelling pressure of the destructive agents of Example 1 and Example 2, respectively. Applicant Mitsui Mining Co., Ltd.

Claims (1)

[Claims] 1. 0.1-0.2w converted to CUO at the stage after firing
A pulverized product obtained by pulverizing a sintered body obtained by sintering a sword containing t% of copper compounds and 25wt% or less of iron compounds in terms of Fe, O, or a calcareous raw material that does not contain it. 100 parts by weight, if necessary, up to 30 parts by weight σ)
Maki 2000~8000C1ll/f Shōro Slag Powder Wood 5
A destructive agent for brittle objects characterized by containing 0 parts or less.