JP3426201B2 - Heavy grout mortar material and method of filling heavy grout mortar using the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heavy grout mortar material mainly used for filling an opening of a shield wall or a shield floor of a nuclear power plant, and a method for filling heavy grout mortar using the same. .

[0002]

2. Description of the Related Art Heretofore, as a grout mortar material, there has been known one in which an aggregate such as river sand or silica sand is added to a binding material obtained by adding a water reducing agent to cement. Further, in order to make it a non-shrinkable material, there is a material to which a calcium sulfaluminate-based or lime-based expansive material or a foaming agent such as metal aluminum powder is added. These are general civil engineering, construction in the field of construction,
For example, it is used for filling and filling work of bridges and mounting bases of machines. In particular, heavy grout mortar using heavy aggregate (specific gravity of 3.0 or more) having a large specific gravity is used for injecting and filling radiation shielding walls, earthquake resistant walls, foundation structures of sound insulation wall mechanical devices, etc. (JP-A-58). -190859, Japanese Patent Publication No. 6-60046, etc.). Moreover, as a method for filling voids in a high shielding wall, lead hair is generally spread and filled, but lead hair is expensive, and a complicated shielding wall,
The shield floor has a problem that it is difficult to perform the filling work (Japanese Patent Laid-Open No. 54-140084, etc.).

In the conventional compounding of heavy grout mortar, a binder 1 in which the ratio of heavy aggregates contains cement is 1
About 300 parts relative to 00 parts, the dry unit volume mass after hardening of the weight grout mortar kneaded by adding water is 2 to
It was 2.3 t / m ³ . However, in recent years, the thickness of the shielding wall required in a nuclear power plant has been restricted by the space of the installation equipment, and it has become necessary to inject and fill from the opening. Unit volume mass has been demanded (cement / concrete NO.633.Nov.1999 "Kanae of nuclear fuel cycle", pp. 28-36). Furthermore, since piping is complicatedly incorporated into these openings, it is necessary that the grout mortar has excellent fluidity and excellent filling properties.

[0004]

In order to produce a heavy grout mortar having a large dry unit volume mass, it is necessary to mix a large amount of heavy aggregate with the binder, but 100 parts of the binder has a large amount of heavy bone. When more than 300 parts of material are mixed,
It is known that heavy grout mortar with good fluidity causes bleeding and material separation (Japanese Patent Publication No. 6-
60046). In addition, there is a problem that when the amount of kneading water is reduced, the fluidity is lowered and the filling property is extremely lowered.

[0005]

The present invention can be summarized as follows: (1) a binder and a maximum particle size of 5 mm and a particle size of 5 to 5;
Proportion of 2.5mm is 20-40%, Ri Na contain specific gravity 4.0 or more by weight aggregate, the weight aggregate is binder 10
It is characterized in that a water reducing agent is blended with a binder containing a weight grout mortar material, (2) cement, an expanding material and a pozzolanic fine powder, which is 500 to 800 parts relative to 0 part (1) ) Weight grout mortar material,
(3) The grout mortar material according to (2) , wherein the water reducing agent is a polycarboxylic acid salt type, and (4) the pozzolanic fine powder.
It is a silica fume (2) or
The grout mortar material described in (3) and the dry unit volume mass of the ( 5 ) hardened mortar are 3 t / m ³ or more, and the weight according to any one of (1) to ( 4 ). Grout mortar material, any of ( 6 ) (1) to (5)
Or after air-kneaded by weight grout mortar material according in a forced mixer in item 1, by weight grout, characterized in that the use of weight grout mortar added water reducing agent and water was prepared by kneading at least 1 minute or more This is a mortar filling method. The% and parts used in the present invention are mass units.

As a result of various studies to solve the above-mentioned problems, the present inventors produced a heavy grout mortar having a large dry unit volume mass and good fluidity by using a specific weight aggregate. The present invention has been completed based on the knowledge that the above problems can be solved.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be specifically described below.

The heavy aggregate used in the heavy grout mortar material of the present invention has a maximum particle size of 5 mm and a particle size of 5 to 2.5 mm.
Is 20 to 40% and the specific gravity is 4.0 or more. If the maximum particle size exceeds 5 mm, not only the fluidity deteriorates, but also the filling property may extremely decrease. It is preferable to include 20 to 40% by weight of aggregate having a particle diameter of 5 to 2.5 mm.
If it exceeds 0%, bleeding tends to occur in the mortar. Further, as the particle size distribution of the heavy aggregate, the coarse particle ratio (F.
It is preferable that M) falls within the range of 2.6 to 3.0. Further, when the specific gravity of the heavy aggregate is less than 4.0, the radiation shielding ability is lowered. The type of heavy aggregate is not particularly limited, but iron particles, magnetite, hematite, limonite, sand iron, and the like can be used, and among them, magnetite whose particle size can be easily adjusted and whose specific gravity is large is preferable.

The dry unit volume mass after curing of the weight grout mortar obtained by adding water to the weight grout mortar material of the present invention and kneading is preferably ³ t / m ³ or more. If the dry unit volume mass is less than 3 t / m ³ , sufficient radiation shielding ability cannot be obtained. Here, the dry unit volume mass is JASS 5N.
It is measured in accordance with T-602 "Testing method for promoting dry unit volume mass of concrete", and is the mass of mortar per unit volume dried to a constant weight at a constant temperature,
The larger the value, the higher the radiation shielding ability.

The binder used in the grout mortar material of the present invention is not particularly limited, but a binder containing cement, an expanding material and a pozzolanic fine powder is preferable.

As the cement used in the present invention, various kinds of portland cement such as normal, early strength, ultrafast strength, low heat and moderate heat, and blast furnace slag, fly ash, silica and limestone fine powder are added to these portland cements. Examples include various mixed cements that have been mixed. Among them, early strength cement is preferable from the viewpoint of strength development.

As the expansive material used in the present invention, calcium sulfaluminate-based (hereinafter referred to as CSA-based) and lime-based expansive materials can be used. Fineness of expanding material is preferably 2500~6000cm ² / g in Blaine specific surface area, 3000~4000cm ² / g is more preferable. 2500cm readily released even bleeding large amount of expansion is less than ² / g, when more than 6000 cm ² / g is time to retain the good flowability tends to be shortened. The addition amount of the expansive material is preferably 6 to 12 parts with respect to 100 parts in total of the cement, the expansive material and the pozzolanic fine powder, and if less than 6 parts, the shrinkage amount of the grout mortar becomes large and 1
If it exceeds 2 parts, the expansion amount may become too large, which is not preferable.

The pozzolanic fine powder used in the present invention is not particularly limited, but granulated blast furnace slag,
Examples include fly ash and silica fume,
Among them, silica fume is preferable in terms of good fluidity of heavy grout mortar, prevention of bleeding and strength development. The fineness of pozzolanic fine powder is preferably 3000 cm ² / g or more in terms of Blaine specific surface area, and 3000 cm ² / g
If it is less than the above range, sufficient effects may not be obtained in terms of good fluidity of the grout mortar, prevention of bleeding, and strength development. The amount of pozzolanic fine powder added is 3 out of 100 parts in total of cement, expansive material and pozzolanic fine powder.
It is preferably from 10 to 10 parts, and if it is less than 3 parts, bleeding tends to occur, and if it exceeds 10 parts, further improvement of the effect cannot be expected.

The water reducing agent used in the present invention is not particularly limited, and generally has a fluidizing effect such as a water reducing agent, an AE water reducing agent, a high performance water reducing agent, a high performance AE water reducing agent, a fluidizing agent and the like. There are things. For example, salts of β-naphthalene sulfonic acid formaldehyde condensate, salts of melamine sulfonic acid formaldehyde condensate, lignin sulfonate, polycarboxylic acid salts and the like, which are commonly used, can be used. From the viewpoint of maintaining fluidity, the polycarboxylic acid salt type is preferable.
The form of the water reducing agent may be in the form of powder or liquid, and is not particularly limited, but liquid is preferred in the present invention, and the addition amount thereof includes cement, expanding material and pozzolanic fine powder. 2 to 100 parts of binder
4 parts is preferred. If it is less than 2 parts, the water reducing effect is low, and if it exceeds 4 parts, the initial strength may be low.

In the present invention, in order to obtain the initial expansion of the grout mortar after kneading, it is preferable to use a foaming agent which generates gas when kneading with water. The foaming agent is not particularly limited, and examples thereof include metal powder and peroxide. Among them, aluminum powder is preferable, but the surface of aluminum powder is easily oxidized,
When covered with an oxide film, reactivity decreases, so vegetable oil,
Some are surface-treated with mineral oil or stearic acid. The amount of the foaming agent added was 0. 100 parts with respect to 100 parts of the binder containing cement, the expansive material and the pozzolanic fine powder.
001 to 0.004 part is preferable. If it is less than 0.001 part, the expansion amount of the grout mortar is too small,
If it exceeds 4 parts, the amount of expansion may be too large and the strength development may decrease.

The ratio of the binder to the weight aggregate in the heavy grout mortar material of the present invention is 100 parts by weight of the binder containing cement, expansive material and pozzolanic fine powder.
500 to 800 parts is preferable. If the weight aggregate is less than 500 parts, it is difficult to secure a dry unit volume mass of 3 t / m ³ or more after hardening of the weight grout mortar, and if it exceeds 800 parts, the weight grout mortar is likely to cause material separation.

The amount of kneading water used in the grout mortar material of the present invention is not particularly limited, but usually, the water / binder ratio is preferably 40 to 70%, and 50 to 6 is preferable.
0% is more preferable. Outside this range, the fluidity may be significantly reduced, or material separation may occur.

In the method of filling heavy grout mortar according to the present invention, the kneading and mixing of the heavy grout mortar is not particularly limited, but it is preferable to use an ordinary pan-type or biaxial type forced mixer. First, the ratio of the binder to the maximum particle size of 5 mm and the particle size of 5 to 2.5 mm is 2
A grout mortar material containing 0 to 40% of a specific gravity of 4.0 or more and a weight of aggregate is kneaded in the mixer, and then a water reducing agent and water are added for 1 minute or more, preferably 1 minute. Mix for half to two minutes to make a heavy mortar. If the kneading is less than 1 minute, it is difficult to obtain proper fluidity of the grout mortar due to insufficient kneading. The kneaded and mixed grout mortar is usually received in a mortar pump or a bucket and then filled by head pressure or the like.

[0019]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples.

Example 1 Using a pan-type forced mixer having a kneading capacity of 55 liters in a thermostatic chamber at 20 ° C., 30 liters of mortar was kneaded per batch. First, the weight aggregate and the binder were kneaded, and then water was added. After adding a water reducing agent and kneading for 1 minute and a half, the fluidity and bleeding amount of the grout mortar were measured. The results are shown in Table 1.

<Materials used> Cement: early-strength Portland cement, commercially available expansion material: CSA expansion material, fineness of 3100 cm ² / g,
Commercially available pozzolanic fine powder: Silica fume, Commercially available metal powder: Aluminum powder, Commercially available water reducing agent: Polycarboxylic acid salt-based high-performance AE water reducing agent, commercially available (liquid) Weight Aggregate: Chilean magnetite powder, specific gravity 4. 77, 5 mm sewage water: Drinking water <Equipment used> Mortar mixer: Pan-type forced kneading mixer, model manufactured by Taiheiyo Metal Co., Ltd. TM-55 <Mortar mix> Binder: Cement, expanding agent and silica fume total 1
In 00 parts, 85 parts of cement, 10 parts of expansive material, 5 parts of silica fume, 0.002 parts of aluminum powder, and 3 parts of water reducing agent are mixed. Heavy aggregate: Chilean magnetite powder is 7 for 100 parts of binder.
Contains 00 parts. The particle size distribution is F. Adjust so that M falls within the range of 2.7 to 3.0. <Measurement method> Fluidity: The spread width of the mortar was measured using the slump cone shown in JIS A 1173 "Method for slump test of polymer cement" and displayed as a mini slump flow value. Bleeding test: Measured according to JIS A 1123 “Concrete bleeding test method”.

[0022]

[Table 1]

As is clear from Table 1, when the weight aggregate of the present invention is out of the range of 20 to 40% which is the ratio of the particle diameter of 5 to 2.5 mm, the fluidity of the weight grout mortar is lowered, It can be seen that material separation occurs.

Example 2 As Example 1 except that the compounding composition of the binder of the grout mortar material, the compounding amount of the water reducing agent, and the compounding amount of the heavy aggregate and the particle size distribution were changed as shown in Table 2. Similarly prepared grout mortar, fluidity of grout mortar,
The bleeding amount, dry unit volume mass, and compressive strength were measured. The results are shown in Table 3.

<Materials Used> Weight Aggregate: Magnetite Ore Powder Ore, specific gravity 4.77, 5% to 2.5 mm under a 5 mm sieve, and blended 30%. Adjusted to M2.86. <Measurement method> Dry unit volume mass: Measured according to JASS 5N T-602 "Dry unit volume mass acceleration test method for concrete". Compressive strength: Measured according to JIS A 1108 "Concrete compression test method". Rate of change in length: Measured in accordance with Annex 1 “Expansion test method for expansive material using mortar” of JIS A 6202 “Expansive material for concrete”.

[0026]

[Table 2]

[0027]

[Table 3]

As is clear from Table 3, the heavy grout mortar material of the present invention has good fluidity and no material separation in a heavy grout mortar containing a large amount of heavy aggregate and having a large dry unit volume mass. I understand.

Example 3 Experiment No. 3 in Table 3 2-5 heavy grout mortar material and experiment No. for comparison. Using the 2-1 that does not use the heavy grout mortar material of the present invention, confirmation of the pumping ability of the heavy grout mortar in the horizontal and vertical directions, and the confirmation of the filling ability into the mold in which the support steel material is arranged are performed. went. In consideration of practicality, the pumping distance of heavy grout mortar is horizontal 2
0 m and vertical 3.5 m. As the mold for confirming the filling property, a transparent acrylic plate was used on one of the top end portion (top surface) and the side surface so that the fluidity of the grout mortar could be observed.
The grout mortar was kneaded using a pan-type forced mixer with a capacity of 55 liters. First, the binder and the weight aggregate were kneaded, and then water and a water reducing agent were added and the mixture was kneaded for 1 minute and a half. After dropping the mortar into the mortar hopper, the mortar pump was used to confirm the pumping property and the form filling property.

<Equipment used> Mortar mixer: Pan-type forced kneading mixer, manufactured by Taiheiyo Metal Co., model TM-55 Mortar hopper: Capacity 60 liter mortar pump: Squeeze mortar pump, manufactured by Shin Meiwa Kogyo, model MM75H High pressure hose: φ40mm × 10m 2 connection

FIG. 1 is an overall layout view of equipment used for filling work according to an embodiment of the present invention. In FIG. 1, the heavy grout mortar kneaded by the mortar mixer 1 is discharged to the mortar hopper 2, the mortar pump 3 conveys the mortar by the high pressure hose 4, and the molds 5 and 6 are filled.
The form 5 for confirming the surrounding of the support member and the form 6 for confirming the stepped portion filling were installed on a flat ground and a stand having a height of 3.5 m, respectively.

FIG. 2 is a perspective view of a form (300 mmW × 200 mmH × 1500 mmL) for confirming the surrounding of the support member. FIG. 3 is a plan view thereof. It is a mold made by supporting the acrylic plates 8a (top plate), 8b (side plate) and the wooden plate 9 with the steel material 7, and the weight grout mortar conveyed from the mortar filling opening 10 is injected. In addition,
Support steel materials 7a (L-shaped steel) and 7b ([shaped steel), and circular pipe 11 were set in the lateral direction. These are arranged so as to prevent the flow of the grout mortar in order to confirm the filling property of the mortar.

FIG. 4 shows a form (400 for checking the filling of the stepped portion).
(mmW × 300 mmH × 800 mmL) FIG. 5 is a plan view thereof, and FIG. 6 is a sectional view thereof. It is a mold made by making the stepped portion out of ordinary mortar 12 and surrounding it with an acrylic plate 8 and a wooden plate 9,
The mortar conveyed from the mortar filling opening 10 is injected. Support steel materials 7c (L-shaped steel) and 7d ([shaped steel) were set. These are arranged so as to prevent the flow of the heavy grout mortar in order to confirm the filling property of the heavy grout mortar.

The pumpability of the heavy grout mortar using the heavy grout mortar material of the present invention shows good pumpability even though it is a mortar with a large amount of heavy aggregate, which is unprecedented, and the horizontal height is 20 m and the vertical height is 3. It was confirmed that the 5m mold could be pumped without any problems. On the other hand, in the comparative heavy mortar which did not use the heavy grout mortar material of the present invention, material separation occurred and the high pressure hose was blocked.

The mold filling property of the heavy grout mortar using the heavy grout mortar material of the present invention is as follows.
In each form, it was confirmed that the heavy grout mortar wraps around to the back side of the support steel and fills every corner of the form.

[0036]

EFFECTS OF THE INVENTION By using the heavy grout mortar material of the present invention, it is possible to provide a heavy grout mortar having good fluidity and no material separation in a composition containing a large amount of heavy aggregate as compared with the prior art. Further, by the filling construction method of the present invention, since it is possible to provide excellent pressure grout mortar pumping property, formwork filling property, it is possible to fill the opening of the radiation shielding wall or the shielding floor having a complicated structure. It is extremely effective.

[Brief description of drawings]

FIG. 1 is an overall layout view of equipment used for filling according to an embodiment of the present invention.

FIG. 2 is a perspective view of a support member portion surrounding confirmation formwork.

FIG. 3 is a plan view of FIG.

FIG. 4 is a perspective view of a stepped portion filling confirmation formwork.

FIG. 5 is a plan view of FIG.

6 is a cross-sectional view of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1: Mortar mixer, 2: Mortar hopper, 3: Mortar pump, 4: High pressure mortar hose, 5a, 5b: Form for confirming support member wraparound, 6a, 6b: Form for confirming stepped part filling, 7a, 7b, 7c, 7d: Support steel material, 8a, 8b: Acrylic plate, 9: Wooden plate, 10: Mortar filling opening, 11: Circular pipe, 12: Normal mortar, 13: Air vent hole

Continuation of front page (51) Int.Cl. ⁷ ID FI C04B 20:00 C04B 22:14 D 22:14 18:14 Z 18:14 24:26 E 24:26) 111: 70 111: 70 (72 ) Inventor Toshio Kato 1-1-1, Wadazakicho, Hyogo-ku, Kobe-shi, Hyogo Mitsubishi Heavy Industries, Ltd.Kobe Shipyard (72) Inventor Masatoshi Yamazaki 1-1-1, Wadazaki-cho, Hyogo-ku, Kobe-shi, Hyogo Heavy Industry Co., Ltd. Kobe Shipyard (56) References JP 62-275049 (JP, A) JP 2001-199754 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) C04B 14 / 34 C04B 20/00

Claims (6)

(57) [Claims] 1. A binder and a maximum particle size of 5 mm and a particle size of 5 to 5.
Proportion of 2.5mm is Ri name contains the specific gravity 4.0 or more by weight aggregate 20-40% by weight aggregate is binder 10
The weight grout mortar material is characterized by being 500 to 800 parts with respect to 0 part . 2. The weight grout mortar material according to claim 1, wherein a binder containing cement, an expansive material and a pozzolanic fine powder is mixed with a water reducing agent. 3. The water reducing agent is a polycarboxylic acid salt type.
The heavy grout mortar according to claim 2.
Material. 4. The pozzolanic fine powder is silica fume.
Weight grout according to claim 2 or 3, characterized in that
Tomortar material. 5. The dry unit volume mass of the cured mortar is 3 t.
/ Wt grout mortar material according to any one of claims 1 to 4, characterized in that m ³ or more. 6. After kneading air in a forced mixer weight grout mortar material according to any one of claims 1-5,
A weight grout mortar filling construction method comprising using a weight grout mortar prepared by adding a water reducing agent and water and kneading the mixture for at least 1 minute.