JP2008266114A - Hydraulic composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hydraulic mortar (slurry) which is prepared by kneading a hydraulic composition with water, is capable of achieving a stable flow characteristic within a reduced time, retains a favorable flow characteristic and does not cause material separation, even when the hydraulic mortar (slurry) is pumped by a slurry hose and supplied to a distant construction site through the slurry hose. <P>SOLUTION: The hydraulic composition comprises a hydraulic component, a fine aggregate, a fluidizer and an expansive agent, wherein the fine aggregate comprises 5-30 mass% particles sized at least 30 μm and smaller than 150 μm, 25-55 mass% particles sized at least 150 μm and smaller than 600 μm and 25-60 mass% particles sized at least 600 μm and smaller than 2,000 μm, based on 100 mass% of the fine aggregate. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention is a hydraulic composition for grout used in civil engineering and construction work. A water slurry can be quickly obtained in a good slurry state by kneading with water, has excellent fluidity, and has high material separation resistance. The present invention relates to a hydraulic composition from which a hard mortar (slurry) can be obtained.
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

In the present invention, the hydraulic composition and water are kneaded to obtain stable flow characteristics in a shorter time, and the prepared hydraulic mortar (slurry) maintains good flow characteristics and is further prepared. An object of the present invention is to provide a hydraulic mortar (slurry) that does not cause material separation even if the hydraulic mortar (slurry) is pumped by a slurry pump and supplied to a remote construction site through a slurry hose.
In the present invention, the hydraulic composition and water are continuously kneaded to prepare a hydraulic mortar (slurry), which is pumped by a slurry pump and continuously supplied to a remote construction site through a slurry hose. An object of the present invention is to provide a construction method for hydraulic mortar (slurry) to be constructed.

  The present invention uses a combination of a hydraulic component containing Portland cement, a polycarboxylic acid-based fluidizing agent, and a fine aggregate having a specific particle size configuration, so that the hydraulic composition and water are initially kneaded. It was found that the kneadability was improved in each stage, and the obtained hydraulic mortar (slurry) continued to maintain good fluidity for a certain period of time. Furthermore, even when the slurry prepared by continuously kneading the hydraulic composition and water is continuously supplied to a remote construction site using a pump, it is stably pumped over a long distance without causing material separation. Found that is possible.

That is, the first of the present invention is
A hydraulic composition containing a hydraulic component, a fine aggregate, a fluidizing agent, and a swelling agent,
The fine aggregate contains 5 to 30% by mass of particles of 30 μm or more and less than 150 μm in 100% by mass of the fine aggregate,
Including 25 to 55% by mass of particles of 150 μm or more and less than 600 μm,
It is a hydraulic composition characterized by containing 25-60 mass% of particles of 600 μm or more and less than 2000 μm.
The second of the present invention is
It is a hydraulic mortar (slurry) obtained by kneading the first hydraulic composition of the present invention and water.
The third aspect of the present invention is
It is a hydraulic mortar (slurry) cured body 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 of this invention is shown below. In the present invention, these embodiments can be combined.
1) The fluidizing agent is a modified polycarboxylic acid fluidizing agent.
2) J funnel flow time Z of hydraulic mortar (slurry) prepared by kneading the hydraulic composition under the conditions of kneading condition A for 1 minute, and hydraulic mortar prepared by kneading for 2 minutes, 4 minutes or 6 minutes The ratio of (slurry) J funnel flow time Y, X, W,
Y / Z, X / Z and W / Z are in the range of 0.75 to 1.00.
3) J mortar flow time Y of hydraulic mortar (slurry) prepared by kneading the hydraulic composition for 2 minutes under the condition of kneading condition A, and hydraulic mortar (slurry) prepared by kneading for 4 minutes or 6 minutes The ratio of J funnel flow time X and W is
Preferably, X / Y and W / Y = 0.90 to 1.02.
4) The dehydration amount of the hydraulic mortar (slurry) prepared by kneading the hydraulic composition and water for 2 minutes under the kneading condition A is 2 to 18 ml.
5) 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 (slurry) equipped with a tank for storing the hydraulic composition. To prepare hydraulic mortar (slurry),
It is used for a grout construction method in which hydraulic mortar (slurry) is continuously supplied to a construction site through a slurry hose by a slurry pump mounted on the truck and is hardened by being placed.
In the present invention, the kneading condition A is a hydraulic composition that is stirred at 300 rpm using a 0.15 KW stirrer in which 16 parts by mass of water is placed in a 2 L plastic container at 20 ° C. and the turbine blades of FIG. 3 are attached. It is to prepare hydraulic mortar (slurry) by adding 100 parts by mass (powder 1500 g) and kneading at 780 rpm for a predetermined time.
The J funnel flow time Z is the J funnel flow time of the hydraulic mortar (slurry) kneaded for 1 minute under the condition of the kneading condition A.
The J funnel flow time Y is the J funnel flow time of the hydraulic mortar (slurry) kneaded for 2 minutes under the condition of the kneading condition A.
The J funnel flow time X is the J funnel flow time of the hydraulic mortar (slurry) kneaded for 4 minutes under the condition of the kneading condition A.
The J funnel flow time W is the J funnel flow time of the hydraulic mortar (slurry) kneaded for 6 minutes under the condition of the kneading condition A.

The hydraulic composition of the present invention uses a hydraulic component, a polycarboxylic acid-based fluidizing agent, and a fine aggregate having a specific particle size configuration, so that slurrying when kneaded with water is significantly accelerated, A slurry having a stable flow characteristic in which the hydraulic composition is uniformly dispersed can be obtained even by an extremely short kneading operation. As a result, J ₁₄ funnel flow value regardless of the length of kneading time can be produced a stable hydraulic mortar (slurry).
Further, even when the slurry is pumped for a long distance using a pump, the hydraulic mortar (slurry) prepared using the hydraulic composition of the present invention has a slow dehydration property under pressure and is a material. Since the separation resistance is excellent, the plugging phenomenon of the slurry hose can be greatly reduced. This excellent material separation resistance enables efficient and stable grout slurry by using the hydraulic composition of the present invention even in the site where hydraulic mortar (slurry) is continuously applied in large scale and in large quantities. It can be manufactured and supplied, and is effective in constructing structures with stable quality.

  The hydraulic composition of the present invention is a hydraulic composition for grout used for civil engineering and construction work, comprising a hydraulic component, a fine aggregate, a fluidizing agent, and a swelling agent as essential components, By this kneading operation, a good slurry state can be quickly obtained, and a hydraulic mortar (slurry) having excellent fluidity and high material separation resistance can be stably prepared.

  The hydraulic component of the hydraulic composition contains Portland cement, preferably 10% by mass or more, more preferably 30% by mass or more, and more preferably 70% by mass with respect to 100% by mass of the hydraulic component. As described above, it is particularly preferable to include 90% by mass or more.

  Examples of Portland cement include ordinary Portland cement, early-strength Portland cement, super-early-strength Portland cement, white Portland cement, and the like, and one or a mixture of two or more can be used.

In addition to Portland cement, the hydraulic component of the hydraulic composition can contain gypsum and alumina cement as long as they do not impair the characteristics of the present invention.
The components contained in the hydraulic component can be selected from only Portland cement, two types of Portland cement and gypsum, two types of Portland cement and alumina cement, and three types of Portland cement, alumina cement and gypsum.

  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.

  The hydraulic composition can contain inorganic components such as blast furnace slag, silica fume, fly ash, and molten slag as long as they do not impair the characteristics of the present invention.

  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 a fine aggregate, a fine aggregate having a specific particle size configuration with a maximum particle size of less than 2 mm is selected and used. By using the fine aggregate, it is possible to obtain a hydraulic mortar (slurry) having good and stable fluidity, and it is possible to avoid clogging of the slurry hose due to material separation when pumped.

The fine aggregate used in the present invention preferably contains 5 to 30% by mass of particles of 30 μm or more and less than 150 μm in 100% by mass of the fine aggregate,
Including 25 to 55% by mass of particles of 150 μm or more and less than 600 μm,
What contains 25-60 mass% of particles of 600 micrometers or more and less than 2000 micrometers can be used conveniently,
More preferably, containing 8 to 28% by mass of particles of 30 μm or more and less than 150 μm,
Containing 30 to 52% by mass of particles of 150 μm or more and less than 600 μm,
What contains 30-55 mass% of particles of 600 micrometers or more and less than 2000 micrometers can be used conveniently,
More preferably, containing 9 to 26% by mass of particles of 30 μm or more and less than 150 μm,
Including 33 to 50% by mass of particles of 150 μm or more and less than 600 μm,
What contains 33-52 mass% of particles of 600 micrometers or more and less than 2000 micrometers can be used conveniently,
Particularly preferably, it contains 10 to 25% by mass of particles of 30 μm or more and less than 150 μm,
Including 35 to 48% by mass of particles of 150 μm or more and less than 600 μm,
What contains 35-50 mass% of particles of 600 micrometers or more and less than 2000 micrometers can be used conveniently.
When the particle size composition of the fine aggregate is not within the above range, when the hydraulic mortar (slurry) is pumped for a long distance (100 m) using a slurry pump, the fine aggregate in the hydraulic mortar (slurry) This is not preferable because it may cause material separation and block the slurry hose.

The amount of fine aggregate used is 100 parts by weight of the hydraulic component,
Preferably 20 to 200 parts by weight,
More preferably 40-190 parts by mass,
More preferably 60 to 180 parts by mass,
It is particularly preferable that the amount be in the range of 80 to 170 parts by mass because excellent good fluidity and material separation resistance and good cured body strength can be obtained.

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.

In the present invention, in order to obtain a hydraulic mortar (slurry) having good flow characteristics by kneading the hydraulic composition and water, a fluidizing agent and a fine aggregate having a specific particle size configuration are combined. To use. Furthermore, in the present invention, in order to avoid the complexity and quality fluctuation of hydraulic mortar (slurry) preparation in the field, in order to premix the components of the hydraulic composition in advance and provide it to the field, A powdery fluidizing agent is selected and used.
As the powdery fluidizing agent used in the present invention, a polycarboxylic acid-based powdery fluidizing agent is preferable, and in particular, a modified polycarboxylic acid-based powdered fluidizing agent can be preferably used.
A commercially available product such as Melflax AP101F manufactured by BASF Construction Systems can be suitably used.

The amount of the polycarboxylic acid-based fluidizing agent used is preferably 0.001 to 5 parts by mass, more preferably 0.01 to 3 parts by mass, more preferably 0.03 to 100 parts by mass of the hydraulic component. 2 parts by mass, particularly preferably in the range of 0.05 to 1 part by mass. If the addition amount is too small, the effect of rapidly dispersing the hydraulic component is poor, and sufficient effects are not exhibited, and there are too many. However, an effect commensurate with the amount added cannot be expected, and it is not only uneconomical, but also is not preferable because the change in fluidity with time and the viscosity of the mortar (slurry) may increase.

In the present invention, an expansion material is used as one of the essential components of the hydraulic composition.
The expansion material used in the present invention is preferably a metal expansion material such as metal powder or an inorganic expansion material such as lime, and particularly preferably used in combination with a metal expansion material and an inorganic expansion material. .
The addition amount of the metal-based expansion material can be added within a range that does not impair the characteristics of the present invention depending on the hydraulic component used, and with respect to 100 parts by mass of the hydraulic component,
Preferably 0.0002 to 0.01 parts by mass,
More preferably 0.0005 to 0.008 parts by mass,
More preferably, 0.0008 to 0.006 parts by mass,
It is particularly preferable to use in the range of 0.001 to 0.005 parts by mass.
The amount of inorganic expansion material added is
Preferably 1-30 parts by weight,
More preferably 2 to 25 parts by mass,
More preferably 3 to 20 parts by mass,
It is particularly preferable to use in the range of 4 to 15 parts by mass.

  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.

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 hydraulic composition of the present invention is not limited to hydraulic components, fine aggregates, fluidizing agents, and expansion materials, but, if necessary, setting agents, thickeners, antifoams as long as the characteristics of the present invention are not lost. At least one or more components such as an agent and resin powder can be included.

  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.

  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 thickener, cellulose-based, protein-based, latex-based, water-soluble polymer-based, and the like can be used, and in particular, cellulose-based can be used.
The addition amount of the thickener can be added as long as the characteristics of the present invention are not impaired.
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. It is preferable in order to improve the characteristics as a hard mortar (slurry).

As the antifoaming agent, known materials such as synthetic materials such as silicon-based, alcohol-based and polyether-based materials or plant-derived natural materials can be used.
The addition amount of the antifoaming agent can be added as long as the characteristics of the present invention are not impaired.

  In the present invention, a hydraulic component, a fine aggregate and a fluidizing agent having a specific particle size configuration, an expansion material, and a setting adjuster, a thickener, an antifoaming agent, a powder resin, and the like, if necessary. The components to be added can be added and mixed with a mixer to obtain a premix powder of a hydraulic composition.

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 J funnel flow time.
Kneading condition A means that 20 parts by mass of water is placed in a 2 L plastic container at 20 ° C., and 100 parts by mass of the hydraulic composition is stirred while stirring at 300 rpm using a 0.15 KW stirrer equipped with the turbine blades of FIG. After the addition (powder 1500 g), the mixture is kneaded at 780 rpm for a predetermined time to prepare hydraulic mortar (slurry).

In the present invention,
J funnel flow time (Z) of hydraulic mortar (slurry) prepared by kneading the hydraulic composition for 1 minute under the conditions of kneading condition A,
J funnel flow time (Y) of hydraulic mortar (slurry) prepared by kneading the hydraulic composition under the conditions of kneading condition A for 2 minutes,
J funnel flow time (X) of hydraulic mortar (slurry) prepared by kneading the hydraulic composition under the conditions of kneading condition A for 4 minutes,
J funnel flow time (W) of hydraulic mortar (slurry) prepared by kneading the hydraulic composition under the conditions of kneading condition A for 6 minutes,
If
Hydraulic mortar prepared by kneading hydraulic funnel (slurry) for 1 minute under the conditions of kneading condition A for 1 minute under the flow of J funnel (Z) and 2 minutes, 4 minutes or 6 minutes. The ratio of the (slurry) J funnel flow time (Y), (X), (W),
Preferably Y / Z, X / Z and W / Z = 0.75 to 1.00,
More preferably, it is the range of Y / Z, X / Z and W / Z = 0.76-0.95,
More preferably, it is the range of Y / Z, X / Z and W / Z = 0.77-0.92,
Particularly preferably, Y / Z, X / Z and W / Z = 0.78 to 0.90 are preferable because a hydraulic mortar (slurry) having good flow characteristics and stability can be obtained quickly. .
When Y / Z, X / Z and W / Z are out of the above ranges, the fluidity of hydraulic mortar (slurry) when kneaded for 1 minute and hydraulic properties when kneaded for 2 minutes, 4 minutes or 6 minutes The flow properties of mortar (slurry) will have a large difference. When such hydraulic mortar (slurry) is pumped and pumped over a long distance via a slurry hose, the flow properties change. It is not preferable because it is easy to be unstable and the flow characteristics vary depending on the pumping distance or the slurry hose may be blocked in some cases.

In the present invention,
The flow time (Y) of the hydraulic mortar (slurry) prepared by kneading the hydraulic composition for 2 minutes under the condition of kneading condition A, and the hydraulic mortar (slurry) prepared by kneading for 4 minutes or 6 minutes. The ratio of J funnel flow time (X), (W)
Preferably, X / Y and W / Y = 0.90 to 1.02.
More preferably, X / Y and W / Y = 0.905 to 1.01.
More preferably, X / Y and W / Y = 0.91 to 1.00,
It is particularly preferred that X / Y and W / Y = 0.92 to 0.99 because a hydraulic mortar (slurry) having good flow characteristics and stability can be obtained quickly.
When X / Y and W / Y are out of the above ranges, the fluidity of hydraulic mortar (slurry) when kneaded for 2 minutes and the fluidity of hydraulic mortar (slurry) when kneaded for 4 or 6 minutes If the hydraulic mortar (slurry) is pumped and a long distance is pumped through the slurry hose, the fluidity tends to change and is not stable. This is not preferable because the flow characteristics differ depending on the case and the slurry hose may be blocked in some cases.

The flow time (Z), (Y), (Y), (Y), (Y) of hydraulic mortar (slurry) prepared by kneading the hydraulic composition of the present invention under the conditions of kneading conditions A for 1, 2, 4, or 6 minutes. X) and (W) are
Preferably in the range of 5-12 seconds,
More preferably in the range of 5.5-11 seconds,
Particularly preferably, it is in the range of 6 to 10 seconds, since excellent fluidity can be secured quickly and stably.

In the present invention,
A hydraulic mortar (slurry) prepared by kneading the hydraulic composition for 2 minutes under the condition of the kneading condition A was subjected to a jack pressure of 1.0 N by the test method of the Japan Society of Civil Engineers pressure breathing test (JSCE F502-1999). The amount of dehydration when the pressure is set for 1 minute under the condition of / mm ² is
Preferably in the range of 2-18 ml,
More preferably in the range of 4-16 ml,
Particularly preferably, it is in the range of 5 to 15 ml.
When supplying hydraulic mortar (slurry) to a construction location via a slurry hose by pumping, it is preferable because material separation hardly occurs under pressure conditions.

In the case of constituting the hydraulic composition of the present invention, particularly preferred component constitutions are a hydraulic component containing Portland cement, a fine aggregate having a specific particle size constitution, a modified polycarboxylic acid-based powder fluidizing agent, an inorganic component It includes a system expansion material and a metal expansion material.

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, the hydraulic composition of the present invention is supplied to a kneading apparatus quantitatively and continuously with water, or is supplied to a mixer facility having a kneading mechanism to quickly knead and have a slurry having a stable fluidity. As a result, it is possible to produce a large amount of hydraulic mortar (slurry) having a stable and continuous fluidity.
In addition, when a large amount of grout (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 the construction site is remote. Using a hydraulic mortar (slurry) preparation / construction truck equipped with a tank for storing a hydraulic composition as shown in the schematic diagram of FIG. 6 that can be supplied and constructed, and using a continuous kneading mixer 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. A grout (hydraulic mortar / slurry) construction method that continuously supplies and casts to a location 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. It can use suitably for the construction method using the truck for hydraulic mortar (slurry) preparation and construction provided with the tank to store.

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 amount of water added is preferably 8 to 50 parts by weight, more preferably 9 to 40 parts by weight, more preferably 10 to 30 parts by weight, particularly preferably 11 to 100 parts by weight of the hydraulic component or grout composition. It is preferable to add 25 parts by mass.

The cured body of hydraulic mortar (slurry) preferably has one or more of the following characteristics.
1) Compression strength (age of 1 day) of preferably 20 N / mm ² or more, more preferably 25 N / mm ² or more, more preferably 30 N / mm ² or more, particularly preferably 32N / mm ² or more.
2) Compressive strength (age of 3 days) is preferably 35N / mm ² or more, more preferably 40N / mm ² or more, more preferably 43N / mm ² or more, particularly preferably 45N / mm ² or more.
3) The expansion rate (1 day) is in the range of more than 0.00%, more preferably more than + 0.01%, more preferably more than + 0.05%, particularly preferably more than + 0.10%.

The hydraulic mortar (slurry) of the present invention is used in the field of civil engineering / architecture, 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, this invention is not restrict | limited by the following Example.

(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 grout slurry.
2) Compressive strength (N / mm ² ):
Using a grout slurry kneaded under conditions of a temperature of 20 ° C. and a humidity of 65%, cured under conditions of a temperature of 20 ° C. and a humidity of 95%, demolded the next day, and then used a specimen φ5 × 10 cm cured in 20 ° C. water, Evaluation is performed in accordance with JIS A-1108.
3) Pressure breathing test:
The test is conducted using a hydraulic mortar (slurry) kneaded under kneading condition A under a temperature of 20 ° C. and a humidity of 65%, using a test container having an inner diameter of 125 mm and an inner height of 200 mm.
Except that the jack pressure is set to 1.0 N / mm ² , the evaluation is performed according to the Japan Society of Civil Engineers pressure breathing test method (JSCE F502-1999).
4) Pump pumpability:
A slurry hose having an inner diameter of 32 mm and a length of 50 m, 75 m, or 100 m is connected to the outlet of the mixer apparatus, and evaluation is performed based on the discharge amount of the slurry discharged from the hose tube tip and the material separation state.
The pump is a MONO pump, model number: 2NM50 (Hyojin Equipment Co., Ltd.).
The evaluation index of the pumpability of the slurry is: ○: no separation of the material of the slurry discharged from the hose tube tip, Δ: the separation of the material of the slurry discharged from the hose tube tip, and x: blockage.
5) Kneading condition A:
At 20 ° C., 16 parts by mass of water was put into a 2 L plastic container (16.4 parts by mass in Reference Examples 1 to 4), and a 0.15 KW stirrer (manufactured by Shinto Kagaku Co., Ltd.) equipped with the turbine blade shown in FIG. No .: Three-one motor BL600), the entire amount of the hydraulic composition (powder 1500 g) was added while stirring at 300 rpm, and then kneaded at 780 rpm for a predetermined time (1 minute, 2 minutes, 4 minutes or 6 minutes) Preparation of hydraulic mortar (slurry) is referred to as kneading condition A.

The following materials were used.
1) Hydraulic component:
Portland cement (Ube Hayashi cement, Blaine specific surface area 4500 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: SS5A, manufactured by Ube Sand Industry Co., Ltd.
-Silica sand B: S6, Ube sand industry company make.
Silica sand C: S7, manufactured by Ube Sand Industries.
Table 4 shows the particle size composition of the silica sands A to C measured using a sieve.
Moreover, the particle size constitution of the fine aggregate used in Comparative Example 1 (a mixture of silica sand A and silica sand B) and the fine aggregate used in Examples 1 and 2 (a mixture of silica sand A, silica sand B, and silica sand C) is shown in FIG. And in Table 4.
3) Expansion material:
・ Inorganic expansive material: Asanodipkar (manufactured by Taiheiyo Cement).
Metal expandable material: aluminum powder (particle size 44 μm or less, 60% or more, manufactured by Daiwa Metal Powder Industry Co., Ltd.).
4) Water reducing agent:
Fluidizer a: Modified polycarboxylic acid-based fluidizer, Melflax AP101F (manufactured by BASF Construction Systems).
-Fluidizer b: Naphthalene sulfonic acid-based fluidizer, Mighty 100 (manufactured by Kao Corporation).
-Fluidizing agent c: Polycarboxylic acid-based fluidizing agent, Mighty 21P (manufactured by Kao Corporation).
Fluidizer d: Polyether / polycarboxylic acid fluidizer, Melflask VP2651 (manufactured by BASF Construction Systems).
Fluidizer e: Polyether / polycarboxylic acid fluidizer, Melflask VP2641 (manufactured by BASF Construction Systems).
5) Thickener: Methylcellulose thickener, High Euros (manufactured by Ube Industries, Ltd.).

(Comparative Example 1, Examples 1-2, Reference Examples 1-4)
4 of the slurry kneaded with the hydraulic composition and water at the blending ratio shown in Table 1 according to kneading condition A, kneaded at 780 rpm for 1 minute, 2 minutes kneaded, 4 minutes kneaded, and 6 minutes kneaded. Types of hydraulic mortars (slurries) were prepared and the J ₁₄ funnel flow down value (seconds) was measured. The compressive strength was measured for a cured mortar (slurry) cured body obtained by curing a slurry prepared by kneading the hydraulic composition under kneading conditions A for 2 minutes. Table 2 shows the measurement results of the J ₁₄ funnel flow-down value (seconds) and the compressive strength.

  Table 3 shows the results of a pressure breathing test on hydraulic mortars (slurries) prepared by kneading for 2 minutes under the kneading conditions A using the hydraulic compositions of Comparative Example 1, Example 1 and Example 2. And in FIG.

Using the hydraulic compositions of Comparative Example 1 and Example 1, the hydraulic composition and a predetermined amount of water were supplied to a slurry production / supply apparatus (FIG. 4) equipped with a mixer apparatus and continuously kneaded. Then, hydraulic mortar (slurry) was continuously produced, and the slurry was temporarily stored in a reservoir tank. The slurry stored in the reservoir tank is discharged using a discharge pump (slurry pump) of a slurry manufacturing facility, and immediately after discharge from the pump is 0 m, the inner diameter connected to the pump is 32 mm, and the length is 50 m, 75 m, and 100 m. The pumping ability was evaluated by discharging from the end of the hose tube. Moreover, the slurry manufactured continuously and accommodated in the reservoir tank and the discharge pump (slurry pump) are set to 0 m immediately after discharge from the pump, and the slurry is discharged from the tube tip of the slurry hose of 50 m, 75 m, and 100 m. J ₁₄ funnel flow value (in seconds) was measured.
Further, the amount of water contained in the slurry was measured by a microwave oven method by partially removing the slurry stored in the reservoir.
Table 3 shows the measurement results of the pumpability and the J ₁₄ funnel flow-down value.
The specifications of the mixer (kneading device) of the slurry production / supply device used for continuous kneading of hydraulic mortar (slurry) and the conditions for continuous production of hydraulic mortar (slurry) are as shown in Table 5. .

(1) In the case of Example 1 and Example 2 in which a modified polycarboxylic acid-based fluidizing agent and a fine aggregate containing a predetermined amount of fine particles (FIG. 1) are used in combination, as shown in Table 2, a slurry prepared by kneading for 1 minute at the kneading condition a, the ratio of J ₁₄ funnel flow values from 2 minutes to prepare kneaded for 6 minutes the slurry at a value close relatively to 1 and 0.80 to 0.86 Stable,
Furthermore, in the ratio of the J ₁₄ funnel flow rate of the slurry prepared by kneading for 2 minutes under the kneading condition A and the slurry prepared by kneading for 4 minutes and 6 minutes, 0.93 to 0.96 and 1 A close value is obtained,
A hydraulic mortar (slurry) in a good kneaded state is obtained very quickly.
Moreover, as shown in Table 3, in Examples 1 and 2, the amount of dehydration under pressure was approximately halved (FIG. 2) compared to Comparative Example 1, and in Example 1, 100 m It was possible to pump the slurry without blocking the slurry hose even when pumping.
(2) Also in the case of Comparative Example 1 using the modified polycarboxylic acid-based fluidizing agent and fine aggregate not containing fine particles (FIG. 1), as shown in Table 2, good kneading can be performed very quickly. A hydraulic mortar (slurry) in a state was obtained, but as shown in Table 3, the amount of dehydration under pressure was large (Fig. 2), and when pumped using a 100 m slurry hose, The slurry hose was blocked due to material separation.

It is a figure which shows the particle size structure of a fine aggregate. (Granularity composition of fine aggregate used in Comparative Example 1 and Examples 1-2) It is a figure which shows the pressure breathing test result (dehydration amount) of hydraulic mortar (slurry). 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 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 kneading screw 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.

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: Kneading screw 18: Mortar (slurry) outlet 19: Mortar (slurry)
20: Reservoir tank 21: Mortar (slurry)
22: Stirrer screw 23: Transfer screw 24: Snake pump (slurry pump)
25: Mortar (slurry)
26, 27, 28: Motor 29, 30: Power transmission belt 31: Hydraulic mortar (slurry) preparation and construction truck 32: Hydraulic composition supply port 33: Hydraulic composition tank 34: Hydraulic mortar (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: Hydraulic mortar (slurry) tank (reservoir tank)
43: Slurry pump 44: Slurry hose

Claims (8)

A hydraulic composition containing a hydraulic component, a fine aggregate, a fluidizing agent, and a swelling agent,
The fine aggregate contains 5 to 30% by mass of particles of 30 μm or more and less than 150 μm in 100% by mass of the fine aggregate,
Including 25 to 55% by mass of particles of 150 μm or more and less than 600 μm,
A hydraulic composition comprising 25 to 60% by mass of particles of 600 μm or more and less than 2000 μm. The hydraulic composition according to claim 1, wherein the fluidizing agent is a modified polycarboxylic acid based fluidizing agent. A hydraulic mortar (slurry) prepared by kneading the hydraulic composition for 1 minute under the condition of kneading condition A for 1 minute under the flow of the J funnel (slurry) and 2 minutes, 4 minutes or 6 minutes. ) The ratio of J funnel flow time Y, X, W
The hydraulic composition according to any one of claims 1 and 2, wherein Y / Z, X / Z and W / Z are in the range of 0.75 to 1.00.
(1) Kneading condition A: After adding 16 parts by mass of water in a 2 L plastic container at 20 ° C., and using 100% by mass of the hydraulic composition while stirring at 300 rpm using a 0.15 KW stirrer equipped with turbine blades (Powder 1500 g) and kneading at 780 rpm for a predetermined time to prepare hydraulic mortar (slurry).
(2) J funnel flow time Z: J funnel flow time of hydraulic mortar (slurry) kneaded for 1 minute under the conditions of kneading condition A.
(3) J funnel flow time Y: J funnel flow time of hydraulic mortar (slurry) kneaded for 2 minutes under the conditions of kneading condition A.
(4) J funnel flow time X: J funnel flow time of hydraulic mortar (slurry) kneaded for 4 minutes under the condition of kneading condition A.
(5) J funnel flow time W: J funnel flow time of hydraulic mortar (slurry) kneaded for 6 minutes under the conditions of kneading condition A. Flow time Y of hydraulic mortar (slurry) prepared by kneading the hydraulic composition for 2 minutes under the condition of kneading condition A, and J of hydraulic mortar (slurry) prepared by kneading for 4 minutes or 6 minutes. Ratio of funnel flow time X and W is
The hydraulic composition according to any one of claims 1 to 3, wherein X / Y and W / Y are in the range of 0.90 to 1.02. A hydraulic mortar (slurry) prepared by kneading a hydraulic composition and water for 2 minutes under kneading condition A has a dehydration amount of 2 to 18 ml in a pressure breathing test (at the time of 1 minute pressurization). The hydraulic composition according to any one of claims 1 to 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 (slurry) having a tank for storing the hydraulic composition. Prepare hydraulic mortar (slurry)
It is used for a grout construction method in which hydraulic mortar (slurry) is continuously supplied to a construction site through a slurry hose by a slurry pump mounted on the truck and is hardened by being placed. The hydraulic composition according to any one of 5. A hydraulic mortar (slurry) obtained by kneading the hydraulic composition according to any one of claims 1 to 6 and water. A cured body of a hydraulic mortar (slurry) obtained by curing a hydraulic mortar (slurry) obtained by kneading the hydraulic composition according to any one of claims 1 to 6 and water.

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