JP2010095389A - Hydraulic composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hydraulic composition which ensures excellent flowing property adoptable in a large-scale grout construction in civil engineering and construction fields and which allows efficient and stable production of a hydraulic mortar (slurry) having good material separation resistance, excellent in crack resistance in a curing process, and further, stably supplied to a distant construction site through a slurry hose over a long distance under pressure by a slurry pump, and placed and applied. <P>SOLUTION: The hydraulic composition includes a hydraulic component, fine aggregate having a specified particle size constitution, a polyether-based shrinkage-reducing agent, a polycarboxylic acid-based or naphthalene sulfonic acid-based fluidizing agent, a defoaming agent, and an inorganic expansive agent. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention is a hydraulic composition for grout used in civil engineering construction work, which can quickly obtain a good slurry state by kneading with water, has excellent flow characteristics, and has good material separation resistance. The present invention relates to a hydraulic composition having a hydraulic mortar (slurry) having excellent crack resistance in the curing process.
Furthermore, the present invention relates to a hydraulic mortar (slurry) and a cured hydraulic mortar (slurry) prepared by kneading the hydraulic composition and water.

Patent Document 1 includes Portland cement for the purpose of providing a grout composition in which a grout composition and water are kneaded continuously or using a continuous kneader to obtain a slurry having stable fluidity. A grout composition comprising a hydraulic inorganic binder, a fluidizing agent, and an expanding agent is disclosed, and further using the pump, a slurry obtained by continuously kneading using the grout composition and using a continuous kneader. The construction method of the grout slurry supplied continuously to a construction part is disclosed.
JP 2006-298862 A

  The present invention is a hydraulic mortar that has excellent flow characteristics that can be employed in large-scale grout construction in the civil engineering and construction field, has good material separation resistance, and is excellent in crack resistance during curing. Slurry) can be produced efficiently and stably. Furthermore, a slurry pump is used to stably pump a long distance through a slurry hose, and hydraulic mortar (slurry) is supplied to a remote construction site for placement. -It aimed at providing the hydraulic composition which can be constructed.

The present inventors include a hydraulic component having a specific component, a fine aggregate having a specific particle size configuration, a polyether-based shrinkage reducing agent, a polycarboxylic acid-based fluidizing agent or a naphthalene sulfonic acid-based water reducing agent. A hydraulic composition comprising an antifoaming agent and an inorganic expansive material has excellent flow characteristics when kneaded with water and has good material separation resistance. (Slurry) was found to be excellent in crack resistance during the curing process.
In addition, the slurry prepared by continuously kneading the hydraulic composition and water is stable and long distance without causing material separation even when continuously supplied to a remote construction site using a pump. The present invention has been completed by finding that it can be pumped and has excellent filling properties during construction.

That is, the first of the present invention is a hydraulic component, fine aggregate, polyether-based shrinkage reducing agent, polycarboxylic acid-based fluidizing agent or naphthalene sulfonic acid-based fluidizing agent, antifoaming agent, inorganic system A hydraulic composition containing an expansion material, the hydraulic composition containing 34.0 to 38.0% by mass of a hydraulic component in 100% by mass of the hydraulic composition, and comprising a polyether-based shrinkage reducing agent. 0.10 to 0.50% by mass, polycarboxylic acid type fluidizing agent 0.050 to 0.075% by mass or naphthalene sulfonic acid type fluidizing agent 0.350 to 0.480% by mass, defoaming 0.001 to 0.039% by mass of the agent, 0.3 to 4.0% by mass of the inorganic expansive material, and the hydraulic component includes 55 early-strength Portland cement in 100% by mass of the hydraulic component. 0.0 to 65.0% by mass, 3 ordinary Portland cement The fine aggregate contains 10.0 to 20.0% by mass of particles having a particle diameter of 30 μm or more and less than 300 μm in 100% by mass of the fine aggregate. , Including particles having a particle diameter of 300 μm or more and less than 600 μm in an amount of 10.0 to 25.0 mass%, particles having a particle diameter of 600 μm or more and less than 1180 μm in 35.0 to 75.0 mass%, and a particle diameter of 1180 μm or more. It is a hydraulic composition characterized by containing 1.0 to 35.0% by mass of particles less than ˜2000 μm.
The second of the present invention is a hydraulic mortar (slurry) obtained by kneading the first hydraulic composition of the present invention and water.
A third aspect of the present invention is a cured hydraulic mortar (slurry) obtained by curing a hydraulic mortar (slurry) obtained by kneading the first hydraulic composition of the present invention and water.

The preferable aspect of the hydraulic composition used by this invention is shown below.
1) The hydraulic mortar obtained by kneading the hydraulic composition and water has a bleeding rate of 0.3% or less and an air amount of 4.5% or less.
2) A cured product of a hydraulic mortar obtained by curing a hydraulic mortar obtained by kneading a hydraulic composition and water has a compressive strength of 28 N days or more of 40 N / m ² or more. 7 day length change rate should be -22 × 10 ⁻⁴ or more.
3) The hardened body of the hydraulic mortar obtained by curing the hydraulic mortar obtained by kneading the hydraulic composition and water has a maximum temperature of simple adiabatic curing temperature of 87 ° C or lower.
4) The hydraulic composition is prepared by continuously kneading the hydraulic composition and water using a mixer mounted on a truck for preparing and constructing a hydraulic mortar equipped with a tank for storing the hydraulic composition. It is used in a grout construction method in which a hard mortar is prepared, and the hydraulic mortar is continuously supplied and placed through a slurry hose by a slurry pump mounted on the truck to be hardened.

The hydraulic composition of the present invention includes a hydraulic component having a specific component, a fine aggregate having a specific particle size configuration, a polyether-based shrinkage reducing agent, a polycarboxylic acid-based fluidizing agent or naphthalene sulfonic acid. A hydraulic mortar (slurry) having excellent material separation resistance as well as excellent flow characteristics when kneaded with water is obtained by including a water reducing agent, an antifoaming agent, and an inorganic expansion agent. Obtainable. As a result, it is possible to produce a hydraulic mortar (slurry) with good flow characteristics and stability.
Moreover, since the hydraulic mortar (slurry) prepared using the hydraulic composition of the present invention has good material separation resistance, it can be pumped over a long distance using a pump, and the efficiency In addition, it is possible to fill a stable construction site hydraulic mortar (slurry) at a remote construction site, and to exhibit an excellent effect in the construction of a structure with stable quality.
Furthermore, the cured body of the hydraulic mortar (slurry) prepared using the hydraulic composition of the present invention has a small dimensional change rate and adiabatic temperature rise during the curing process, and is excellent in crack resistance. You can get a body.

The hydraulic composition of the present invention is used for a grout used in civil engineering and construction work, comprising a hydraulic component, a fine aggregate, a shrinkage reducing agent, a fluidizing agent, an antifoaming agent, and an inorganic expansion material as essential components. It is a hydraulic composition that has excellent flow characteristics when kneaded with water, has good material separation resistance, has a small dimensional change rate and adiabatic temperature rise during the curing process, and is resistant to cracking. Can be stably prepared.

The hydraulic component of the hydraulic composition is
It is a hydraulic component containing early-strength Portland cement and ordinary Portland cement. The early-strength Portland cement is preferably 55.0 to 65.0 mass%, more preferably 55.5 in 100 mass% of the hydraulic component. -64.7% by mass, particularly preferably 56.5-64.0% by mass, and ordinary Portland cement is preferably 35.0-45.0% by mass in 100% by mass of the hydraulic component. More preferably, it is 35.3 to 44.5% by mass, particularly preferably 36.0 to 43.5% by mass.
If the component of the hydraulic component is not within the above range, the hydraulic mortar (slurry) becomes difficult to stably obtain excellent flow characteristics and material separation resistance, and further in the curing process due to an increase in the adiabatic temperature. It is not preferable because it may cause defects in cured properties such as cracking of the resin, reduction in compressive strength, and bleeding.

The hydraulic component used in the present invention is preferably 34.0 to 38.0% by mass, more preferably 34.5 to 37.5% by mass, and more preferably 34% in 100% by mass of the hydraulic composition. It is preferable that it is 0.7-37.2 mass%, Most preferably, it is 35.0-37.0 mass%.
When the amount of hydraulic component is larger than the above range, the tendency to deteriorate the flow characteristics becomes stronger, and further, the adiabatic temperature rises and the probability of causing cracks in the curing process increases. , The tendency for the compressive strength to decrease is increased, and bleeding is likely to occur.

Furthermore, the hydraulic component of the present invention includes, in addition to early-strength Portland cement and ordinary Portland cement, quick-hardening cement such as gypsum and alumina cement, ultra-high-strength Portland cement, as long as the characteristics of the present invention are not impaired. Portland cement such as moderately heated Portland cement can be included, and one or two or more can be used in combination.

  As the gypsum, gypsum such as anhydrous or semi-water can be used as one kind or a mixture of two or more kinds regardless of the kind.

  Several types of alumina cement having different mineral compositions are known and commercially available, but the main component is monocalcium aluminate (CA), and commercially available products can be used regardless of the type.

  In the hydraulic composition of the present invention, excellent flow characteristics can be obtained by kneading with water, and a hydraulic mortar (slurry) having excellent resistance to cracking in the curing process can be obtained. And using an agent.

As the shrinkage reducing agent used in the present invention, it is preferable to use a polyether shrinkage reducing agent. Commercially available products such as Takedan Yushi Co., Ltd. can be used suitably.

The polyether-based shrinkage reducing agent is preferably 0.10 to 0.50% by mass, more preferably 0.15 to 0.45% by mass, and particularly preferably 0.20 to 100% by mass of the hydraulic composition. It is preferable that it is 0.40 mass%.
If the addition amount is less than the above range, the dimensional change rate is large, the tendency to crack in the curing process is high, and if it is more than the above range, an effect commensurate with the addition amount cannot be expected and it is simply uneconomical. In addition, the tendency to cause bleeding increases, which is not preferable.

In addition, as the fluidizing agent used in the present invention, it is preferable to use any one selected from a polycarboxylic acid based fluidizing agent or a naphthalene sulfonic acid based fluidizing agent.
As a commercial product, Mighty 100 manufactured by Kao Corporation can be suitably used.

The polycarboxylic acid-based fluidizing agent is preferably 0.050 to 0.075% by mass, more preferably 0.052 to 0.074% by mass, and particularly preferably 0.054% in 100% by mass of the hydraulic composition. It is preferable that it is -0.073 mass%.
The naphthalene sulfonic acid-based fluidizing agent is preferably 0.350 to 0.480% by mass, more preferably 0.360 to 0.475% by mass, in 100% by mass of the hydraulic composition.
Especially preferably, it is 0.380-0.470 mass%.
If the addition amount of the fluidizing agent is less than the respective preferable ranges, the effect of quickly dispersing the hydraulic component is poor, and sufficient effects (good fluidity, excellent material separation resistance) are not exhibited, On the other hand, if it is more than the preferred range, an effect commensurate with the amount added cannot be expected, and this is not only uneconomical but also unfavorable because it tends to cause bleeding.

In the hydraulic composition of the present invention, a hydraulic mortar (slurry) having good fluidity can be obtained quickly by kneading with water, and further a hydraulic mortar (slurry) having excellent material separation resistance. In order to stably obtain the above, a fine aggregate having a specific particle size configuration having a maximum particle size of less than 2 mm (2000 μm) and a minimum particle size of 30 μm or more is selected and used. By using the fine aggregate, it is possible to obtain a hydraulic mortar (slurry) having a good and stable fluidity, and avoiding clogging of the slurry hose accompanying material separation even when pumping a long distance. it can.

Fine aggregates include silica sand, river sand, sea sand, mountain sand, crushed sand, etc., silica powder, clay minerals, inorganic materials such as waste FCC catalyst, urethane crushed, EVA foam, resin pulverized products such as foamed resin, An alumina cement clinker aggregate or the like can be used.
As for the fine aggregate, it is particularly preferable to use sand such as quartz sand, river sand, sea sand, mountain sand, crushed sand, quartz powder, waste FCC catalyst and the like.

The fine aggregate used in the present invention preferably contains 10.0 to 20.0% by mass of particles of 30 μm or more to less than 300 μm in 100% by mass of the fine aggregate, and 10 particles of particles of 300 μm or more to less than 600 μm. Preferred are those containing 0 to 25.0 mass%, 35.0 to 75.0 mass% of particles of 600 μm to less than 1180 μm, and 1.0 to 35.0 mass% of particles of 1180 μm to less than 2000 μm. More preferably, it contains 11.0 to 18.0% by mass of particles of 30 μm to less than 300 μm, 11.0 to 23.0% by mass of particles of 300 μm to less than 600 μm, and 600 μm to less than 1180 μm 40.0-72.0% by mass of particles containing 1180 μm or more and less than 2000 μm of particles can be suitably used, and particularly preferred. Contains 12.0 to 17.0% by mass of particles of 30 μm or more to less than 300 μm, 12.0 to 22.0% by mass of particles of 300 μm or more to less than 600 μm, and 42.42% of particles of 600 μm or more to less than 1180 μm. One containing 0 to 70.0% by mass and containing 2.0 to 10.0% by mass of particles of 1180 μm or more and less than 2000 μm can be suitably used.
When the particle size composition of the fine aggregate is not within the above range, the hydraulic mortar (slurry) becomes difficult to stably obtain excellent flow characteristics and material separation resistance, and the hydraulic mortar (slurry) is slurried. When pumping a long distance (100 m), the fine aggregate in the hydraulic mortar (slurry) may cause material separation and block the slurry hose, which is not preferable.

  The amount of fine aggregate used is preferably 20 to 90% by mass, more preferably 40 to 80% by mass, and particularly preferably 50 to 70% by mass in 100% by mass of the hydraulic composition. It is preferable because excellent fluidity, material separation resistance, pumpability, and good cured body strength can be obtained.

In the hydraulic composition of the present invention, an inorganic expansion material is used because a hydraulic mortar (slurry) having a small dimensional change rate in the curing process and excellent crack resistance can be obtained.

Examples of the inorganic expansive material include Auin for calcium sulfoaluminate type, quick lime, quick lime-gypsum type, calcined dolomite and the like for lime type, and at least one selected from these can be used. As the lime-based expansion material, quick lime and quick lime-gypsum are preferable, and quick lime-gypsum is particularly preferable.
As the inorganic expansion material, for example, a material containing free quick lime as an expansion component or a commercial product having an ettringite-forming substance such as calcium sulfoaluminate as an expansion component can be used. Preferably, an expansion material containing, as an active ingredient, quick lime having an effect of enhancing strength under a low temperature environment by a hydration exotherm during reaction as well as a shrinkage compensation effect, in this case the quick lime content in the expansion material is not particularly limited, In the case where the quicklime content is high (including 100% by weight), the hydration reaction may proceed abruptly, so the content is preferably 80% by weight or less.

The addition amount of the inorganic expansion material is preferably 0.3 to 4.0% by mass, more preferably 0.5 to 3.5% by mass, and particularly preferably 1.% by mass with respect to 100% by mass of the hydraulic composition. It is preferable to use in the range of 0 to 3.0% by mass.
If the addition amount is small, the rate of dimensional change is large, a sufficient expansion effect is not exhibited, and if it is too large, cracks due to excessive expansion occur in the curing process, which is not preferable.

In the present invention, an antifoaming agent is used as an essential component of the hydraulic composition.
As the antifoaming agent used in the present invention, synthetic materials such as silicon-based, alcohol-based, and polyether-based materials or plant-derived natural materials can be used. In particular, a polyether-based antifoaming agent can be preferably used.
The addition amount of the antifoaming agent is preferably 0.001 to 0.039% by mass, more preferably 0.003 to 0.038% by mass, and particularly preferably 0.005% with respect to 100% by mass of the hydraulic composition. It is preferable to use in the range of -0.037 mass%.
If the amount added is less than the preferred range, sufficient defoaming effect will not be exhibited, air stagnation tends to occur when filling a mold or the like, and the integrity with the structure may be impaired, and the amount added is preferred. If the amount is more than the range, the flow characteristics are deteriorated and bleeding tends to occur, which is not preferable.

  The hydraulic composition of the present invention is not limited to the characteristics of the present invention, if necessary, in addition to the hydraulic component, fine aggregate, shrinkage reducing agent, fluidizing agent, inorganic expansion agent and antifoaming agent. At least one or more components such as a metal-based expansion material, a setting regulator, a resin powder, a thickener, and an inorganic fine powder can be included.

The metal-based expansion material can be added within a range that does not impair the characteristics of the present invention, and is preferably used in combination with an inorganic expansion material.
As the metal-based expansion material, metal powder such as aluminum powder and iron powder can be used, and among these, the use of aluminum powder is particularly preferable in terms of specific gravity. As the aluminum powder, those conforming to the second type of JIS K-5906 “Aluminum powder for coating” can be preferably used.

  The setting modifier can be appropriately added within a range that does not impair the characteristics, depending on the hydraulic component to be used, and the components, addition amount, and mixing ratio of the setting accelerator and setting retarder are appropriately selected to improve the fluidity, The pot life, curing properties, etc. can be adjusted.

As the resin powder, a resin powder prepared by spray-drying a polymer emulsion obtained by emulsion polymerization such as an ethylene / vinyl acetate copolymer and an acrylic polymer can be used.

As the thickener, cellulose-based, protein-based, latex-based, modified acrylamide-based, water-soluble polymer-based, and the like can be used, and in particular, modified acrylamide-based and cellulose-based materials can be used. The addition amount of the thickener can be added as long as the characteristics of the present invention are not impaired.
In addition, using a thickener and an antifoaming agent together has a favorable effect on suppressing separation of aggregates such as hydraulic components and fine aggregates, suppressing generation of bubbles, and improving the surface of the cured body, and is used for grout. In order to improve the characteristics as a hydraulic mortar (slurry).

As the inorganic fine powder, blast furnace slag, fly ash, calcium carbonate, microsilica, molten slag and the like can be used as long as they do not impair the characteristics of the present invention.

When constituting the hydraulic composition used in the present invention, the preferred component constitution is a hydraulic component having a specific component, a fine aggregate having a specific particle size constitution, a polyether shrinkage reducing agent, and a polycarboxylic acid. It is a hydraulic composition containing a system fluidizing agent or a naphthalene sulfonic acid-based water reducing agent, an antifoaming agent, and an inorganic expansion material.

In the case of constituting the hydraulic composition used in the present invention, particularly suitable component constitutions are a hydraulic component having a specific constituent, a fine aggregate having a specific particle size constitution, a polyether shrinkage reducing agent, and a polycarboxylic acid. A hydraulic composition containing an acid-based fluidizing agent or naphthalene sulfonic acid-based water reducing agent, an antifoaming agent, and an inorganic expansion material, and further includes a metal-based expansion material and a thickening agent.

  In the present invention, hydraulic component, fine aggregate, shrinkage reducing agent and fluidizing agent, inorganic expansion agent and antifoaming agent, if necessary, metallic expansion agent, setting agent, powder resin, resin powder One or more components selected from thickeners, inorganic fine powders and the like can be added and mixed with a mixer to obtain a premix powder of a hydraulic composition.

  The hydraulic composition of the present invention is obtained by stably kneading a hydraulic mortar (slurry) having good fluidity by kneading with water using a kneading apparatus or a mixer facility having a kneading mechanism. Can be manufactured.

  In addition, since the hydraulic composition of the present invention is supplied to a mixer facility having a kneading mechanism quantitatively and continuously together with water, a slurry having a stable fluidity can be obtained by kneading quickly. As shown in FIG. 1, a continuous kneading apparatus provided with a helical stirring blade in a hydraulic slurry tank (reservoir tank) can be preferably used. As the spiral stirring blade, one having a shape and dimensions as shown in FIG. 2 can be preferably used, and the uniformity of the hydraulic mortar (slurry) in the hydraulic slurry tank (reservoir tank) can be further increased. The fluidity and material separation characteristics of the hard mortar (slurry) can be stabilized.

Furthermore, when a large amount of hydraulic mortar (slurry) is to be constructed within a limited period of time on a large-scale site, hydraulic mortar (slurry) is manufactured continuously and supplied to remote construction sites. Using a hydraulic mortar (slurry) preparation / construction truck equipped with a tank for storing a hydraulic composition as shown in FIG. 3, and using a continuous kneading mixer (FIG. 1) mounted on the truck, The hydraulic mortar (slurry) is continuously prepared by kneading the hydraulic composition and water continuously, and the hydraulic mortar (slurry) is applied through the slurry hose by the slurry pump mounted on the truck. The hydraulic mortar (slurry) construction method that supplies and casts continuously is extremely effective in construction efficiency and construction quality.
The hydraulic composition of the present invention is rapidly kneaded with a predetermined amount of water, and a slurry having excellent fluidity and good material separation resistance can be obtained stably. The hydraulic mortar (slurry) having a tank for storage can be suitably used in a construction method using a truck for preparation and construction, and the prepared hydraulic mortar (slurry) is preferably 50 m to 150 m, more preferably 75 m to 135 m, particularly preferably 100 to 120 m can be pumped and supplied to the construction site.

The hydraulic composition of the present invention can quickly prepare a hydraulic mortar (slurry) having good flow characteristics and excellent material separation resistance by kneading with a predetermined amount of water. In the present invention, the hydraulic composition and water are kneaded under the condition of kneading condition A, and the flow characteristics of the hydraulic mortar (slurry) obtained by the kneading operation are evaluated by the J14 funnel flow-down value.
The kneading condition A is a temperature-controlled room with a temperature of 20 ° C. and a humidity of 65%, using a hydraulic composition and water cured at the same temperature as the temperature-controlled room, and having a predetermined water ratio shown in Tables 1 to 6 in a 2 L plastic container. Water was added, and using a 0.15 KW stirrer equipped with a turbine blade having the shape shown in FIG. 4, 1500 g of the hydraulic composition was added while stirring at 300 rpm, and then kneaded at 780 rpm for 2 minutes. Slurry).

The hydraulic composition of the present invention was prepared by kneading under the conditions of kneading condition A, and the J14 funnel flow down value of the hydraulic mortar (slurry) measured in the same temperature chamber is preferably 4.0 to 10.1 seconds. In the range of 5.0 to 10.05 seconds, more preferably in the range of 6.0 to 10.0 seconds, and excellent fluidity can be quickly and stably secured. It is preferable because a hydraulic mortar (slurry) having separation resistance can be obtained stably.

The hydraulic composition of the present invention adjusts the fluidity of the hydraulic mortar (slurry), the material separation resistance, and the strength of the cured product obtained by further curing by adjusting the amount of water added. be able to.
The amount of water added can be appropriately selected and used depending on the hydraulic component or hydraulic composition used. The water ratio (water / hydraulic composition), which is the mass ratio of the hydraulic composition to water, is preferably 0.080 to 0.500, more preferably 0.090 to 0.400, and particularly preferably 0.00. A range of 110 to 0.200 is preferable. In addition, the water ratio uses the value which remove | divided the addition amount of water by the mass of the hydraulic composition.

The hydraulic mortar (slurry) preferably has the following characteristics.
1) The bleeding rate is preferably 0.3% or less, more preferably 0.2% or less, and particularly preferably 0.1% or less.
2) The amount of air is preferably 4.5% or less, more preferably 4.0% or less, and particularly preferably 3.5% or less.

The cured body of hydraulic mortar (slurry) preferably has the following characteristics.
1) Compressive strength (material age 28 days) is preferably 40 N / mm ² or more, more preferably 45 N / mm ² or more, and particularly preferably 50 N / mm ² or more.
2) The rate of change in length (material age 7 days) is preferably −22 × 10 ⁻⁴ or more, more preferably −21 × 10 ⁻⁴ or more, and particularly preferably −20 × 10 ⁻⁴ or more.
3) The maximum temperature of the simple adiabatic curing temperature is preferably 87 ° C or lower, more preferably 86 ° C or lower, and particularly preferably 85 ° C or lower.
4) Confirmation of cracking (visual observation): ○: No cracking.

The hydraulic mortar (slurry) of the present invention is used in the field of civil engineering and construction, such as tunnel and shield backfilling, dam seams, bridge shu, structural repair and reinforcement, reinforcing joints, fixing machine foundations, sewer repairs, etc. In the various grout constructions, the utility value is great because it has performance such as high fluidity, non-shrinkage and high strength.
In particular, when large-scale grouting is performed at a large-scale site, hydraulic mortar (slurry) is continuously prepared, and its performance is demonstrated when it is continuously supplied to the construction site and placed. Is.

Hereinafter, the present invention will be described in more detail based on examples. However, the present invention is not limited by the following examples.

(Characteristic evaluation method)
1) J ₁₄ funnel flow down (seconds):
In conformity with JSCE Filling Mortar test method (draft) (JSCE · F542-1993), showing the falling value by _{J 14} funnel method hydraulic mortar (slurry).
2) Bleeding rate (%)
The bleeding rate after 2 hours of kneading of hydraulic mortar (slurry) is shown in accordance with “Non-Shrinkage Mortar Quality Standard Test Method” (JHS 312-1999) of NEXCO standard.
3) Compressive strength (N / mm ² ):
A test specimen cured using hydraulic mortar (slurry) kneaded at a temperature of 20 ° C. and a humidity of 65%, cured at a temperature of 20 ° C. and a humidity of 95%, demolded the next day, and then cured in water at 20 ° C. for 28 days. Evaluation is performed according to JIS A-1108 using φ5 × 10 cm.
4) Expansion / contraction rate (%):
The expansion / shrinkage ratio on the 7th day of the age is shown in accordance with the “Non-shrinkage mortar quality standard test method” (JHS 312-1999) of NEXCO standard.
5) Pump pumpability:
Evaluation is performed by connecting a slurry hose having an inner diameter of 32 cm and a length of 25 m, 50 m or 100 m to the outlet of the discharge pump of the mixer apparatus.
The pump is a MONO pump, model number: 2NM50 (Hyojin Equipment Co., Ltd.).
The evaluation indexes of the pumpability of the hydraulic mortar (slurry) are: ○: no blockage, x: blockage.
6) Length change rate:
The length change rate is measured using the apparatus shown in FIG. The length change rate is measured by placing hydraulic mortar (slurry) immediately after kneading to the height of the mold inside the mold, and measuring the length change immediately after casting, with a measurement interval of every 10 minutes. And measure up to 7 days of age. The measurement conditions are 20 ° C. and RH 65%.
The rate of change in length of the hydraulic mortar (slurry) when cured is the amount of change (mm) in the distance between the end of the displacement sensor shown in FIG. 5A and the SUS disk adjacent to the end of the displacement sensor. Is a value obtained by dividing by a distance (b = 480 mm) between two SUS disks located inside a cured body of hydraulic mortar (slurry).
7) Simple insulation curing temperature (℃):
The apparatus shown in FIG. 6 is used for the measurement of the simple adiabatic curing temperature. The simple adiabatic curing temperature is measured by placing hydraulic mortar (slurry) immediately after kneading into the mold in the heat insulating material, and starting the measurement of the simple adiabatic curing temperature immediately after placing, with a measurement interval of every 5 minutes. Do. The measurement conditions are 20 ° C. and RH 65% in a constant temperature room.
8) Confirmation of crack (visual):
Using hydraulic mortar (slurry) kneaded at a temperature of 20 ° C and a humidity of 65%, it is poured into a plastic container of 20cm in length x 12cm in width and 2cm in height, cured at a temperature of 35 ° C and a humidity of 60%, and driven in. Visually check for cracks after 7 days. The evaluation index is as follows: ○: no crack, ×: crack.
9) Air volume (%):
Using a hydraulic mortar (slurry) kneaded under the conditions of a temperature of 20 ° C. and a humidity of 65%, the air amount is shown in accordance with JIS A 1128 “Testing Method for Fresh Concrete with Air Pressure”.
10) Kneading condition A:
In a temperature-controlled room at a temperature of 20 ° C. and a humidity of 65%, using a hydraulic composition and water cured at the same temperature as the temperature-controlled room, water having a predetermined water ratio shown in Tables 1 to 6 is placed in a 2 L plastic container. Using a 0.15 KW stirrer (manufactured by Shinto Kagaku Co., product number: Three-One Motor BL600) equipped with the turbine blades shown in FIG. 1, 1500 g of the hydraulic composition was added while stirring at 300 rpm, and then kneaded at 780 rpm for 2 minutes. Preparation of hydraulic mortar (slurry) is referred to as kneading condition A.

The following materials were used.
1) Hydraulic component:
-Early strong Portland cement (Ube early strong cement, Blaine specific surface area 4500 cm ² / g).
-Ordinary Portland cement (Ube ordinary cement, Blaine specific surface area 3300 cm ² / g).
The evaluation method of the specific surface area is measured using a brain air permeation device defined in JIS R-5201.
2) Fine aggregate:
-Silica sand A: N30, made by Ashiya company.
Silica sand B: S4, manufactured by JFE Minerals.
Silica sand C: N50, manufactured by Ashiya Company.
Silica sand D: N70, manufactured by Ashiya Company.
-Silica sand E: N40, made by Ashiya company.
3) Expansion material:
・ Inorganic expansive material: for Pacific Hyperexpan structure (manufactured by Taiheiyo Materials).
Metal expandable material: aluminum powder (particle size 44 μm or less, 60% or more, manufactured by Daiwa Metal Powder Industry Co., Ltd.).
4) Fluidizer:
Fluidizing agent a: polycarboxylic acid-based fluidizing agent, Melflax AP101F (manufactured by BASF Pozzolith).
Fluidizer b: Naphthalene sulfonic acid-based fluidizer, Mighty 100 (manufactured by Kao Corporation).
5) Shrinkage reducing agent: polyether-based shrinkage reducing agent, Hibidan (manufactured by Takemoto Yushi Co., Ltd.)
6) Antifoaming agent: polyether antifoaming agent, B107F (made by ADEKA)
7) Microsilica: Blaine specific surface area 19000 cm ² / g, manufactured by SKW East Asia 8) Thickener A: Cellulosic thickener, Hyeurose (manufactured by Ube Industries).
9) Thickener B: Modified acrylamide type thickener, Starvis 4302F (manufactured by BASF Pozzolith).

(Comparative example 1, Examples 1-5)
Table hydraulic composition in the proportions shown in 1 and the water is kneaded according kneading conditions A to prepare a hydraulic mortar (slurry), J ₁₄ funnel flow value at the same constant temperature chamber (s), the temperature 35 Crack confirmation (visual observation) was measured in a thermostatic chamber at 60 ° C. and a humidity of 60%. The measurement results are shown in Table 1. Moreover, the result of having measured the length change rate using the hydraulic mortar (slurry) is shown in FIG.

(Comparative Examples 2-5, Examples 1, 2, 5)
A hydraulic mortar (slurry) was prepared by kneading the hydraulic composition and water at the blending ratio shown in Table 2 according to the kneading condition A, and the J ₁₄ funnel flow-down value (seconds), bleeding rate ( %). Furthermore, crack confirmation (visual observation) was measured in a temperature-controlled room at a temperature of 35 ° C. and a humidity of 60%. The compressive strength was measured for 28 days on a cured hydraulic mortar (slurry) obtained by curing a slurry prepared by kneading the hydraulic composition under kneading conditions A. The measurement results are shown in Table 2. Moreover, the result of having measured the length change rate using the hydraulic mortar (slurry) of Examples 1, 2, 5 and Comparative Examples 2 and 5 is shown in FIG. The result of having measured the simple heat insulation curing temperature (degreeC) using 5 hydraulic mortar (slurry) is shown in FIG.

(Comparative Examples 6-7, Examples 1, 2, 5, 6)
A hydraulic mortar (slurry) was prepared by kneading the hydraulic composition and water at the blending ratio shown in Table 3 according to kneading condition A, and the J ₁₄ funnel flow-down value (seconds) and bleeding rate ( %). The compressive strength was measured for 28 days on a cured hydraulic mortar (slurry) obtained by curing a slurry prepared by kneading the hydraulic composition under kneading conditions A. Table 3 shows the particle size composition of the fine aggregate used. Table 3 shows the measurement results.

(Comparative Examples 8-11, Examples 1, 5-9)
The hydraulic composition and water were kneaded according to the kneading conditions A at the blending ratio shown in Table 4 to prepare a hydraulic mortar (slurry), and the J ₁₄ funnel flow down value (seconds), bleeding rate ( %). Table 4 shows the measurement results.

(Comparative Examples 12-13, Examples 1, 2, 5, 10)
The hydraulic composition and water were kneaded according to the kneading condition A at the blending ratio shown in Table 5 to prepare a hydraulic mortar (slurry), and the J ₁₄ funnel flow-down value (seconds), expansion / contraction rate in the same constant temperature room (%) And bleeding rate (%) were measured. Furthermore, crack confirmation (visual observation) was measured in a temperature-controlled room at a temperature of 35 ° C. and a humidity of 60%. Table 5 shows the measurement results. Moreover, the result of having measured the length change rate using the hydraulic mortar (slurry) is shown in FIG.

(Comparative Examples 14-15, Examples 1, 2, 5, 11)
A hydraulic mortar (slurry) was prepared by kneading the hydraulic composition and water at the blending ratio shown in Table 6 according to kneading condition A, and the J ₁₄ funnel flow-down value (seconds), bleeding rate ( %) And air amount (%). The compressive strength was measured for 28 days on a cured hydraulic mortar (slurry) obtained by curing a slurry prepared by kneading the hydraulic composition under kneading conditions A. Table 6 shows the measurement results.

(Example 11)
Using the hydraulic composition of Example 11, the hydraulic composition and a predetermined amount of water are supplied to a slurry production / supply device (FIG. 1) equipped with a mixer device and continuously kneaded, and hydraulic mortar. (Slurry) was continuously produced, and the slurry was once stored in a reservoir tank.
The hydraulic mortar (slurry) is held in a reservoir tank for about 2 minutes under a forced stirring condition by a stirrer having a composite stirring blade in which a multi-helical stirring plate and a paddle type stirring plate are arranged. It discharged using the discharge pump (slurry pump).
The hydraulic mortar (slurry) discharged from the discharge pump (slurry pump) of the slurry production facility is 0 m immediately after discharge from the pump, the inner diameter connected to the pump is 32 mm, the length is 25 m, 50 m, 75 m and 100 m. The pumping ability was evaluated by discharging from the tube tip. Also, slurry manufactured continuously and accommodated in a reservoir tank, and a discharge pump (slurry pump), immediately discharged from the pump is set to 0 m, and discharged from the tube tip of a 25 m, 50 m, 75 m and 100 m slurry hose. _{for, J 14} funnel flow value, bleeding rate was measured crack (visual) and 28 days compressive strength.
The ratio of water contained in the slurry was measured by a microwave method with a part of the slurry contained in the reservoir taken out.
Pumpability, J ₁₄ funnel flow value, bleeding rate, the measurement results of crack (visual) and 28 days compressive strength shown in Table 7.

In Examples 1 to 5 using a predetermined amount of the polyether-based shrinkage reducing agent, the length change rate of the slurry kneaded under the kneading condition A as shown in FIG. 7 is a comparative example in which the polyether-based shrinkage reducing agent is not used. Better than 1. Moreover, as shown in Table 1, the slurries of Examples 1 to 5 have good crack resistance even in crack confirmation (visual observation).
In Examples 1, 2, and 5 using hydraulic components having specific components, the slurry kneaded under kneading conditions A as shown in FIG. The heat generation is suppressed. Further, as shown in FIG. 8 and Table 2, the slurries of Examples 1, 2, and 5 have a smaller rate of change in length than the slurry of Comparative Example 5, and good crack resistance is obtained even in crack confirmation (visual observation). It has been. Further, as shown in Table 2, the slurries of Examples 1, 2, and 5 are more excellent in material separation resistance than Comparative Example 2. Even when a hydraulic component having a specific component is used, the slurry of Comparative Example 3, which is less than a predetermined amount, is inferior in material separation resistance as compared with the slurry of Examples 1, 2, and 5 from Table 2. 8 and Table 2, the slurry of Comparative Example 4, which is larger than the specific predetermined amount, is inferior in crack resistance as compared with the slurry of Examples 1, 2, and 5.
The slurry obtained by kneading the hydraulic compositions of Examples 1, 2, 5, and 6 using the fine aggregate having a specific particle size configuration under the kneading condition A was compared with the comparative example 6 as shown in Table 3, J14 Since the funnel flow value is good and the material separation resistance is superior to that of Comparative Example 7, excellent pumpability is obtained.
Table 4 shows slurries obtained by kneading the hydraulic compositions of Examples 1, 5, and 7-9 using a predetermined amount of polycarboxylic acid-based fluidizing agent or naphthalene sulfonic acid-based fluidizing agent under kneading conditions A. In addition, since the J14 funnel flow-down value is good and the material separation resistance is excellent, excellent pumpability is obtained. The slurry obtained by kneading the hydraulic compositions of Comparative Examples 9 and 10 under the kneading condition A less than the predetermined amount deteriorates the J14 funnel flow-down value, and kneads the hydraulic compositions of Comparative Examples 8 and 11 larger than the predetermined amount. Since the slurry kneaded under the condition A causes material separation, excellent pumpability cannot be obtained.
The slurry obtained by kneading the hydraulic compositions of Examples 1, 2, 5, and 10 using a predetermined amount of the expanding material under the kneading condition A has an appropriate length change rate as shown in FIG. In the crack confirmation (visual observation) shown in Table 5, good crack resistance and material separation resistance are also obtained.
The slurry obtained by kneading the hydraulic compositions of Examples 1, 2, 5, and 11 using a predetermined amount of antifoaming agent under the kneading condition A has a good J14 funnel flow-down value as shown in Table 6 and material separation resistance. Excellent in properties. Moreover, since the amount of air is smaller than that of the slurry obtained by kneading the hydraulic composition of Comparative Example 14 under the kneading condition A, the slurry is less likely to cause air accumulation when filled with the slurry, thereby producing a highly integrated structure. it can.

A slurry prepared using the hydraulic composition shown in Example 11 was pumped and a pumping experiment was conducted through slurry hoses of 25 m, 50 m, and 100 m. A hose resulting from an arching phenomenon of aggregate or material separation No internal occlusion was observed, and good pumpability was obtained. In the same pumping test, the slurry hose tip slurry of 25 m, 50 m, and 100 m has a good J14 funnel flow down value, excellent material separation resistance, and excellent crack resistance. A cured product can be obtained.

It is a schematic cross section for demonstrating an example of a structure of the slurry manufacture and supply apparatus used by this invention. It is a figure which shows the whole structure of the composite stirring blade which has arrange | positioned the multiple helical stirring board and paddle type stirring board which are used by this invention. It is a schematic diagram which shows the whole structure of the truck for hydraulic mortar (slurry) preparation and construction which mounts the tank which stores a hydraulic composition, and a slurry manufacture and supply apparatus. It is a schematic diagram which shows the turbine blade used when preparing hydraulic mortar (slurry) on the kneading conditions A. It is a schematic diagram which shows the outline | summary of the measuring device which measures a length change rate. It is a schematic diagram which shows the outline | summary of the measuring device which measures simple heat insulation curing temperature. It is a figure which shows the length change rate of the mortar (slurry) hardening body using Examples 1-5 and the hydraulic composition of the comparative example 1. FIG. It is a figure which shows the length change rate of the mortar (slurry) hardening body using the hydraulic composition of Example 1, 2, 5 and the comparative examples 2 and 5. FIG. It is a figure which shows the heat insulation temperature rise of the mortar (slurry) hardening body using the hydraulic composition of Examples 1, 2, 5 and Comparative Examples 2-5. It is a figure which shows the length change rate of the mortar (slurry) hardening body using the hydraulic composition of Examples 1, 2, 5, 10, and Comparative Examples 12 and 13. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10: Kneading screw 11: Slurry manufacturing and supply apparatus 12: Hydraulic composition 13: Hopper 14: Hopper screw 15: Water supply port 16: Kneading apparatus (mixer)
17: Water 18: Mortar (slurry) outlet 19: Hydraulic mortar (slurry)
20: Reservoir tank 21: Hydraulic mortar (slurry)
22: Stirrer screw (composite stirring blade with multiple spiral stirring plates and paddle type stirring plates)
23: Transfer screw 24: Snake pump (slurry pump)
25: Hydraulic mortar (slurry)
26, 27: Motor 28: Power transmission belt 31: Hydraulic mortar / slurry preparation / construction truck 32: Hydraulic composition supply port 33: Hydraulic composition tank 34: Hydraulic slurry 35: Kneading device (mixer)
36: Hopper 37: Hydraulic composition 38: Screw feeder 39: Water tank 40: Water supply pump 41: Water supply pipe 42: Composite stirring blade 43 provided with multiple spiral stirring plates and paddle type stirring plates 43: Hydraulic Slurry tank (reservoir tank)
44: Slurry pump 45: Slurry hose

Claims (7)

Hydraulic composition comprising a hydraulic component, fine aggregate, polyether-based shrinkage reducing agent, polycarboxylic acid-based fluidizing agent or naphthalene sulfonic acid-based fluidizing agent, antifoaming agent, and inorganic expansion material The hydraulic composition contains 34.0 to 38.0% by mass of a hydraulic component in 100% by mass of the hydraulic composition, and 0.10 to 0.50% by mass of the polyether-based shrinkage reducing agent. %, Polycarboxylic acid type fluidizing agent 0.050-0.075% by mass or naphthalene sulfonic acid type fluidizing agent 0.350-0.480% by mass, and antifoaming agent 0.001-0. 039% by weight, 0.3 to 4.0% by weight of an inorganic expansive material, and the hydraulic component is 55.0 to 55.0% by weight of early strong Portland cement in 100% by weight of the hydraulic component. Contains 35.0-45.0% by weight of ordinary Portland cement The fine aggregate contains 10.0 to 20.0 mass% of particles having a particle diameter of 30 μm or more to less than 300 μm in 100 mass% of fine aggregate, and the particle diameter is 300 μm or more to less than 600 μm. And particles having a particle diameter of 600 μm or more and less than 1180 μm, 35.0 to 75.0 mass%, and particles having a particle diameter of 1180 μm or more and less than 2000 μm are 1.0. A hydraulic composition containing ˜35.0 mass%. The hydraulic mortar obtained by kneading the hydraulic composition and water has a bleeding rate of 0.3% or less and an air amount of 4.5% or less. Hydraulic composition. A cured product of a hydraulic mortar obtained by curing a hydraulic mortar obtained by kneading a hydraulic composition and water has a compressive strength of 40 N / m ² or more at a material age of 28 and a material age of 7 days. The hydraulic composition according to claim 1, wherein a rate of change in length of the resin is −22 × 10 ⁻⁴ or more. The hardened body of a hydraulic mortar obtained by curing a hydraulic mortar obtained by kneading a hydraulic composition and water has a maximum temperature of a simple adiabatic curing temperature of 87 ° C or lower. The hydraulic composition of any one of 1-3. The hydraulic composition is prepared by continuously kneading the hydraulic composition and water using a mixer mounted on a truck for preparing and constructing a hydraulic mortar equipped with a tank for storing the hydraulic composition. 2. A grouting method in which a hydraulic mortar is continuously supplied to a construction site through a slurry hose by a slurry pump mounted on the truck, and is hardened by setting. The hydraulic composition of any one of -4. A hydraulic mortar obtained by kneading the hydraulic composition according to any one of claims 1 to 5 and water. The hardening body of the hydraulic mortar obtained by hardening the hydraulic mortar obtained by knead | mixing the hydraulic composition and water of any one of Claims 1-6.

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