KR830001266B1 - Demolition agent for brittle materials - Google Patents

Abstract

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Description

Destructive Agents of Brittle Objects

Fig. 1 is a perspective view of a device for measuring the inflation pressure indicated by the first-destructing agent.

2 and 3 are diagrams showing the relationship between the breaking agent and other pastes at 20 ° C. and 5 ° C., respectively, and the expansion pressure at the center of the pressure measuring tube height.

The present invention relates to a destructive agent for brittle objects such as concrete, rocks and bricks.

Background Art Conventionally, various agents such as explosives, expanded gases, and expandable materials have been proposed as destructive agents for brittle objects such as concrete, rocks, and bricks. Among them, gunpowder is a good destructive agent because it has a great destruction effect per unit time, but it has a drawback that causes pollution due to noise, zeolite, vibrating dust, etc. at the time of explosion or carries risks in operation. As one of the methods for eliminating this defect, a method has been proposed in which a hole is formed in a brittle object, a slurry of expandable material is filled therein, and the brittle object is destroyed by the expansion force.

When using this method, there is no noise, no vibration, and less risk than noise due to drilling. Because quicklime has a high expansion force, it may be used as a destructive agent. However, quicklime is manufactured by mixing with water and kneading with water, and hydrated to expand rapidly, resulting in a sharp decrease in ductility. This has the disadvantage of becoming difficult. In addition, even if injected, the expansion pressure escapes in the direction of the hole opening, so the pressure on the side wall of the hole is extremely weak and cannot be used as a breaker. In order to overcome this drawback, a method of suppressing the expansion pressure by injecting kneaded quicklime into the hole and fixing a firm restraint cap in the opening of the hole may be considered, but this is not preferable because it is not easy to operate. . In addition, in order to suppress the hydration rate of quicklime, a method of adding silicide (fluoride) to the quicklime has been considered, but since the quicklime does not have its own hardenability, even if the hydration rate is suppressed, the expansion pressure of the produced ash is increased. Exit in the direction of the opening. Therefore, large expansion pressure cannot be expected. In addition, the quicklime is extremely difficult to control the hydration rate because the reactivity varies depending on the firing state at the time of manufacture.

The inventors of the present invention have studied from various angles to obtain a material having high expansion rate and expansion pressure as a main agent of quicklime, and have a ratio of lime, siliceous, and gypsum in a molar ratio of CaO / SiO ₂ = 5.0 to 14.4 CaSO ₄ / SiO ₂ = 0.13 When mixed at a ratio of 1.19 and calcined at 1350 to 1550 ° C. under an oxidizing atmosphere, CaO crystals were composed of 24 to 65% by weight of 3CaO · SiO ₂ crystals, 30 to 60% by weight of CaO crystals, and CaSO ₄ 5 to 17% by weight. The clinker contained in the 3CaO · SiO ₂ crystals, in which more than 50% by weight of the mouth was greatly developed, was obtained, and the clinker was pulverized, indicating that the hydration rate was relatively slow, but the expansion rate and the expansion pressure were increased.

According to the present invention, the composition of the main component is 24 to 65% by weight of 3CaO · SiO ₂ crystals, 30 to 60% by weight of CaO grains, and 5 to 17% by weight of CaSO _4. It is a brittle object breaker composed of clinker powder contained in the developed 3CaO.SiO ₂ crystals.

In the present invention, when the 3CaO.SiO ₂ crystal of the clinker is 24% or less, a paste obtained by kneading the powder of the clinker with water is made into a hole in a brittle object and injected into the hole, thereby swelling by hydration of coexisting CaO crystal grains. It is difficult to act as a crushing force by ejecting out of the injection port as in the case of purchase of a bay. In addition, when 3CaOSiO ₂ crystals are 65% or more, the CaO grains and CaSO ₄ components of the residue are reduced, so that the expansion pressure does not appear. If the CaO grain size is less than 30%, the amount of 3CaO.SiO ₂ crystals becomes too large, so that a large expansion pressure cannot be obtained as mentioned above. In addition, when the CaO grain is more than 60%, the expansion force is large, but the amount of 3CaO · SiO ₂ and CaSO ₄ , which are its own curable components, decreases, and the inclusion rate of CaO crystal grains in the 3CaO · SiO ₂ crystal is less than 50%. If the paste obtained by kneading the crushed powder with water is made into a hole in the brittle object and injected into the hole, the paste expands and is ejected out of the injection hole so that a large expansion pressure cannot be obtained. In addition, when CaSO ₄ is less than 5%, the sintering becomes difficult and the crystal development of 3CaO · SiO ₂ crystals and CaO becomes poor, and the expansion rate is too fast and expansion is insufficient because the inclusion of CaO crystal grains in 3CaO · SiO ₂ crystals is insufficient. Since the overwhelming is small, the expansion pressure is extremely fine. In addition, when CaSO ₄ is 17% or more, the clinker is not preferable due to calcining and melting.

The powder degree of the present invention is preferably a plane specific surface area of 1500 to 4000 cm 2 / g, the smaller the specific surface area, the slower the anti-glare of the paints, while the larger the specific surface area, the higher the specific surface area is required to inject the holes of the brittle object. A large amount of water is required to maintain, resulting in low expansion pressure, which is not desirable as a breaker.

Particularly, as the destroying agent, cement precipitation agents such as lignin crabs, which are currently commercially available, sulfonic acid salts of higher polyhydric alcohols, oxyorganic acid alkylarylsulfonates and their copolycondensates, polyoxyethylene alkyl ethers, and polyoxy complexes If the one selected from the system, water-soluble melamine resin system, and β-naphthaline sulfonic acid formalin condensate system is compatible or two or more types are added and mixed, the expansion pressure of the destructive agent can be further improved. In mixing the cement reducing agent with the above-mentioned destructive agent, the powdery or oily phase may be mixed or ground in the above-described clinker grinding step or may be mixed after grinding the clicker. Even if the aqueous solution is mixed with water in the step of adjusting the paste of the breaker, the effect does not change. The amount of these water reducing agents is about 0.5 to 2%.

In the case of breaking the brittle object by using the method of the present invention, 0.25 to 0.3 parts of water is kneaded with respect to 1 part by weight of the breaking agent, and the paste is poured into the holes provided in the brittle object. The expansion pressure shown depends on the expansion manufacturability and hole diameter, but surprisingly, in the case of 36, 42, 52 mm, pressures of 320, 380, 400 kg / cm 2 or more may appear.

Moreover, the destructive agent of this invention can be used also in the place of 5 degreeC or more of outside temperature.

Cause I destruction of the present invention showing a large swelling pressure is not clear expanding agent if one of a paste, so many that the CaO crystal grain coating to 3CaO · SiO ₂ crystal 3CaO · SiO ₂ crystal was expressing the strength urgently sign language, and then The CaO crystal grains hydrate when hydrated, causing large frictional forces to occur between the wall of the hole and the expansion pressure almost entirely acting on the wall.

In addition, when the water-repellent agent is incorporated into the breaker, the amount of water required to obtain the paste of the year required for injection is reduced, the amount of the breaker increases in the unit volume of the paste, and the initial hydration of 3CaO.SiO ₂ crystals. It is thought that this is because the strength of the paste is promoted to increase the hydration expansion due to the CaO grains.

The measurement result of the expansion pressure represented by the paste of this invention is shown below.

The apparatus used for this measurement test is the same as shown in FIG. In the drawing, (1) is a steel pipe vertically erected with a pipe diameter of 36 mm and a length of 20 cm, and two peppertrain gauges with a gauge length of 5 mm are faced to each other at a height of 10 cm of the steel pipe (1). It is attached to the pipe and sealed by welding the steel plate 3 to the bottom.

Experimental Example 1

The composition of clinker is about 35% of 3CaOSiO ₂ crystals about 50% CaO grains, about 10% CaSO _{4 and} about 5% impurities (3CaOAl ₂ O ₃ , 4CaOAl ₂ O ₃ , Fe ₂ O _3, etc.) As a water reducing agent, a clinker contained in 3CaO · SiO ₂ crystals, in which about 63% of the CaO grains distributed in the particle diameter of 5 to 30 μ were greatly developed at a plane specific surface area of 3340 cm 2 / g, was used as a high hydride as a water reducing agent. The main component is a high-condensation product of alkyl arylsulfonic acid salt) or a melt (addition of water-soluble melamine resin as the main ingredient) and those without addition thereof are used as a destructive agent. The paste obtained by kneading was filled into a steel tube, and hydrated at 20 ° C and 5 ° C to obtain a change by the age of the expansion pressure in the center of the tube, and the results of FIGS. 2 and 3 are obtained.

From the above test, it can be seen that the destructive agent of the present invention shows a large expansion pressure. Therefore, when the destructive agent of the present invention is used, it has a great breaking strength, so that rocks and concrete can be easily destroyed.

Next, an embodiment in which rocks and concrete are destroyed using the breaking agent of the present invention will be described.

Example 1

The clinker used in Test Example 1 was excavated with four holes of 3.5cm in diameter and 100cm in depth at 70cm intervals from 1.8 × 2.0 × 1.5m angle limestone crushed by powder explosives in limestone. Pulverized by adding 1% (weight) of the melt powder as a destructive agent, kneading the destructive agent at 35% of water ratio, filling it into the hole and leaving it at an ambient temperature of 15 ° C. After 30 hours, limestone began to grind. After days it was destroyed into seven clumps.

Claims (1)

The main component composition is 24 to 65% by weight of 3CaO · SiO ₂ crystals, 30 to 60% by weight of CaO crystal grains, 5 to 17% by weight of CaSO _4, and at least 50% by weight of CaO crystal grains is contained in the 3CaO · SiO ₂ crystals. A breaker for brittle objects in which clinker powder is added with 0.5 to 2% by weight of cement sensitizer.

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