JPH06200232A - Fracturing agent composition - Google Patents

Abstract

PURPOSE:To obtain a composition which can statically and safely fracture rocks or the like within a short time by using specified clinkers based on quick lime and a specified self-hardening substance, etc. CONSTITUTION:This fracturing agent composition comprises clinkers based on quick lime, a self-hardening substance, a cement water reducing agent (e.g. water-soluble melamine resin), and a pot life regulator (e.g. calcium carbonate). The clinker comprises a group of particles with diameters of 10-1.5mm and a group of particles with diameters of 0.5mm or below, and the self-hardening substance is a quick-setting cement, desirably alumina cement or jet cement.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a static crushing agent composition for breaking brittle objects such as rocks, and more specifically, it uses a clinker having a so-called gap grade particle size and a rapid hardening cement. Thus, the present invention relates to a crushing agent composition that can be crushed safely and in a short time with good workability.

[0002]

2. Description of the Related Art Conventionally, the problems to be solved by the invention
Rolled rock, rock mass, as one of the methods of destroying brittle objects such as concrete, pre-drilling the brittle object, injecting a slurry made by kneading powdery expansive crushing agent and water into the holes, There is known a method of crushing a brittle object by utilizing the expansion pressure generated in the process of hydration of the crushing agent slurry. As a crushing agent used in this method, for example, Japanese Patent Publication No. 60-1904 is known. However,
This method was not always advantageous compared to the destructive method using explosives or heavy machinery. The reason is that the above-mentioned crushing agent, considering the safety during construction,
This is because the reaction time (crushing time) of the crushing agent slurry cannot be shortened to 10 to 20 hours or less. That is, if a hydration accelerator such as calcium chloride is added to the conventional crushing agent, or if the crushing agent is further refined to accelerate the hydration reaction and shorten the reaction time, the heat of hydration accumulates in the pores, The unreacted water becomes pressurized steam, and the crushing agent slurry is jetted out of the holes, so that the expansion pressure becomes difficult to act as the crushing force and is extremely dangerous.

Therefore, a crushing agent, a construction method and the like for preventing such a jetting phenomenon have been published, but as described below, all have drawbacks. (1) Cartridge type crushing agent with less free water (already on the market). However, this crushing agent has no effect unless the crushing agent is filled in the holes and sufficiently tamped, so that the workability is significantly deteriorated. (2) The powdery crushing agent is pressure-molded into a certain particle size range,
Alternatively, it is made into a coarse grain (Japanese Patent Publication No. 2-17596).
By doing so, a method of releasing water vapor out of the system. However, since these granulating and crushing agents are complicated to manufacture and have many voids at the time of filling, a sufficient crushing effect cannot be often obtained. (3) A method of providing a lid against water vapor on the upper part of the hole during construction. It is not practical because the work is complicated. The inventors of the present application, as a result of various studies to obtain a crushing agent that is mainly made of quick lime and can obtain a large expansion pressure in a short time,
The inventors have found that a crushing agent that eliminates the above-mentioned drawbacks and that eliminates the above-mentioned drawbacks can be obtained by combining a high-density particle composition and a rapid-hardening cement, and completed the present invention.

[0004]

The present application has been made to solve the above drawbacks, and is constituted by the inventions described in the following (1) to (3). (1) Clinker containing quicklime as a main component, self-hardening substance,
A crushing agent composition comprising a cement water reducing agent and a pot life adjusting agent, which contains a clinker having a particle size of 10 to 1.5 mm and 0.7 mm or less as a clinker, and a rapid hardening cement as a self-hardening substance A crushing agent composition comprising: (2) The clinker is in a state in which the squareness of the surface of the particles is removed, and the weight ratio of the clinker having a particle size of 10 to 1.5 mm and the clinker having a particle size of 0.7 mm or less. Is (60-95: 40-5), The crushing agent composition as described in said (1). (3) The crushing agent composition as described in (1) or (2) above, which contains alumina cement and jet cement as the self-hardening substance, or these and ordinary cement.

[0005] In the present invention, the clinker mainly composed of quick lime, those obtained by firing limestone or a main component limestone, this SiO _2,
It is obtained by firing a mixture containing components such as Al ₂ O ₃ , Fe ₂ O _{3 and the} like, calcium sulfate, etc., or a mixture of two or more thereof, for example, 1350 to 1450 ° C. It is a solid product obtained by firing for 24 hours. And, among those obtained by crushing these hard-baked clinker, only a particle size group of 10 to 1.5 mm and a particle size group of 0.7 mm or less, in other words, a particle size group of 1.5 mm to 0.7 mm or less are included. In addition, a so-called gap grade particle composition is used. In addition, the particle size group of at least 10 to 1.5 mm is one in which the squareness of the particle surface is scraped off with, for example, trommel or the like, and the particle is shaped more like a sphere. The degree of shaping is such that the unit volume weight of the composition of the present invention is 1.8 or more, and more preferably 1.9 (kg / l) or more. Further, the weight ratio of the clinker in these two particle size groups is preferably (60 to 95:40 to 5). When the weight ratio of the coarse particle portion is less than 60, the fluidity of the composition slurry is small and the workability is deteriorated. If the weight ratio of the coarse-grained portion exceeds 95, the filling degree becomes too low and the hydration reaction becomes slow. In the present invention, the clinker as described above exhibits an action such as ball belling during use, and since the crushing agent composition is closely packed, it is possible to greatly reduce the amount of water used during construction. It will be possible.

In the present invention, the self-hardening substance is a cement having so-called hydraulic property. In the present invention, among them, rapid hardening cement, for example, cement having the ability to set and harden in a short time such as alumina cement and jet cement is essential. These cements are 1
2CaO · 7Al ₂ O ₃ , 3CaO · Al ₂ O ₃ , Ca
O ・ Al ₂ O ₃ , 11CaO ・ 7Al ₂ O ₃・ Ca
_{F 2, 3CaO · 3Al 2 O} 3 · CaF 2, 3CaO ·
It contains calcium aluminate such as 3Al ₂ O ₃ .CaSO ₄ . The ordinary cement includes not only commercially available Portland cement but also mixed cement such as fly ash cement and blast furnace cement. The proportion of the quick-hardening cement in the self-hardening substance is 5% by weight or more, and can be appropriately selected depending on the conditions such as the composition of the composition, the properties, and the use environment. If the rapid hardening cement content is less than 5% by weight, the friction with the pore wall is not sufficient, and the hydration expansion force escapes to the upper part of the pores, the openings, etc., and free water becomes steam due to the heat of hydration reaction, resulting in slurry. There is a risk of spouting. The blending weight ratio of the clinker containing quicklime as the main component and the self-hardening substance is (90 to
60:10 to 40). If the blending weight ratio of the self-hardening substance is less than 10, the digestive reaction of quick lime is large and strength against water vapor pressure cannot be obtained, so there is a risk of ejection from the injection hole, and the expansion pressure causes the crushing force. It does not become. Also,
If the blending weight ratio of the self-hardening substance exceeds 40, the swelling pressure decreases, and the crushing takes too much time, and a sufficient crushing effect cannot be obtained.

In the crushing agent composition of the present invention, a cement water reducing agent is used as the main component for the purpose of further reducing the amount of water used, and is also an adjusting material for securing a desired pot life when necessary. Add a set retarder or set accelerator. Here, the cement water-reducing agent is used for the purpose of improving the fluidity of the composition and reducing the amount of water used, and higher performance is more preferable. For example, one or more of β-naphthalene sulfonate, polycarboxylate, lignin sulfonate, and water-soluble melamine resin are used. The amount used is, for example, 0.2 with respect to the self-hardening substance.
The amount is appropriately selected within the range of 3 wt%. Further, the pot life adjusting agent is used for the purpose of adjusting the hydration reaction rate of the clinker component and the self-hardening substance to secure the pot life necessary for the work, for example, potassium carbonate, sodium carbonate, One selected from inorganic salts such as sodium bicarbonate, organic hydroxycarboxylic acids or salts thereof such as citric acid, tartaric acid, sodium citrate, sodium gluconate, etc., or chlorides of alkali metals, alkaline earth metals, nitrates, etc. The above is raised.

Since the composition of the present invention uses a gap grade clinker and a water reducing agent, a slurry having good fluidity can be obtained by using a small amount of water. Then, the pot life adjusting agent secures a necessary working time, and the self-hardening substance is cured within a short time according to the construction conditions. Therefore,
The expansion force due to the hydration of the clinker containing wollastonite as a main component is effectively transmitted to the side wall of the pore of the crushed object, a large frictional force is generated on the hole wall, and the hardened material can be firmly adhered to the side wall. Therefore, a very large expansion pressure can be expressed. Moreover, since there is no danger of the slurry being jetted out of the holes due to water vapor, it is possible to safely and reliably perform the crushing operation of the brittle object.

When using the composition of the present invention, a sand-like material can be used for the purpose of improving the fluidity of the slurry. In addition, admixture materials other than the above can be appropriately blended within a range that does not impair the action of the composition.

Hereinafter, the present invention will be described in more detail with reference to Examples, Test Examples and Comparative Examples. <Raw materials used> * Clinker containing quicklime as a main component A sintered body obtained by firing a mixed powder of 93 parts by weight of limestone, 5 parts by weight of clay and 2 parts by weight of gypsum at 1450 degrees Celsius for 2 hours, and The sinter obtained by firing limestone at 1350 degrees Celsius for 24 hours was coarsely crushed with an impeller breaker, and was crushed into 750 mm diameter trommel (1 rotation / second).
After removing the squeezing for over a minute, the product is sieved and
2.5 mm and 0.7 mm or less, and 8.0 to 1.2
The clinker of the particle group of mm and 0.7 mm or less was adjusted. For comparison, particles having a particle size of 8.0 mm or less and those without trommel treatment (corner removal treatment) (N
o. 9 and No. 12) was also prepared. * Self-hardening substance Alumina cement No. 1 (manufactured by Denki Kagaku Kogyo Co., Ltd.), jet cement (manufactured by Onoda Cement Co., Ltd.), and ordinary Portland cement (manufactured by Onoda Cement Co., Ltd.) were used. * Cement water reducing agent Melment F10 (Melamine type, manufactured by Showa Denko KK) * Working time adjusting agent Calcium carbonate * Kawasuna 2.5-0.3mm (Ogasa product, specific gravity 2.75)

<Experimental example> A clinker and a self-hardening substance were used.
Used in the proportions shown in Table 1 below, the water reducing agent and the pot life adjusting agent were added to the self-hardening substance at 0.5 and 0.2% by weight, respectively, so that the water ratio was 20% by weight. Water was added to and kneaded for 30 seconds to prepare a slurry. The obtained slurry was used as an inner diameter 40 with a strain gauge attached beforehand.
The expansion pressure was obtained by pouring the steel into a steel pipe having a length of 300 mm and a length of 300 mm, and measuring the strain after 2 hours, 3 hours, and 4 hours. The results are shown in Table 1. All experiments were conducted at 20 degrees Celsius. In addition, No. 9 and N
o. No. 12 is an example using a clinker which is not treated with trommel (stripping treatment). In addition, No. 7 and N
o. In 10, the slurry was jetted out.

[0012]

[Table 1]

[0013]

Example: A hole of φ40 × 400 mm was drilled in the central portion of a 600 × 600 × 600 mm concrete specimen,
The crushing agent slurry having the composition used in Experimental Example 1 was filled.
A crack of 0.5 mm was generated after about 2 hours, and completely divided after 3 hours. As a comparative example, Experimental Example 1
When the crushing agent slurry having the composition used in 1 is filled,
A crack of 0.5 mm was generated after about 6 hours, and it took 8 hours to completely divide it.

[0014]

EFFECTS OF THE INVENTION Since the crushing agent composition of the present invention is constituted as described above, the amount of water used is small, the fluidity is good, and the hydration reaction occurs in a short time.
The above-mentioned expansion pressure is effectively exhibited, and a large expansion destruction force can be obtained in a short time. Moreover, since there is no danger of the slurry being jetted, there is an effect that the fragile object can be crushed safely and efficiently in a short time.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masinori Nozaki No. 102 Shimizu No. 5 Heim 4-13-36 Higashimachi, Koganei, Tokyo

Claims (3)

[Claims] 1. A crushing agent composition comprising a clinker containing lime as a main component, a self-hardening substance, a cement water reducing agent and a pot life adjusting agent, and having a particle size of 10 to 1.
A clinker of only particle groups of 5 mm and 0.7 mm or less,
A crushing agent composition comprising a rapid hardening cement as a self-hardening substance. 2. The clinker is a clinker having a particle size of 10 to 1.5 mm and a clinker having a particle size of 0.7 mm or less. Weight ratio is (60-95: 40-5)
The crushing agent composition according to claim 1, which is 3. The crushing agent composition according to claim 1 or 2, which contains alumina cement and jet cement, or these and ordinary cement as the self-hardening substance.