JP2016007784A - Manufacturing method of self-flowing hydraulic composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of a self-flowing hydraulic composition which has superior operability by virtue of high fluidity, surface smoothness (flatness), surface horizontality, quick hardening property and the like and, in particular, is excellent in surface smoothness (flatness).SOLUTION: A manufacturing method of a self-flowing hydraulic composition includes: a first manufacturing step of manufacturing an intermediate composition by mixing an admixture including a thickener and a modified silicon oil and an extender; and a second manufacturing step of manufacturing a self-flowing hydraulic composition by mixing base material which comprises portland cement, alumina cement, gypsum, inorganic powder and fine aggregate, the intermediate composition and a defoaming agent. Therein, an intermediate product does not include the defoaming agent as the admixture.

Description

  The present invention relates to a method for producing a self-flowing hydraulic composition used for construction of a structure such as a concrete floor structure.

  The self-flowing mortar obtained by kneading the self-flowing hydraulic composition with water requires excellent workability due to high fluidity, surface smoothness (flatness), surface horizontality and fast hardening. The

  Self-flowing hydraulic compositions are roughly classified into a gypsum system and a cement system. As a cement composition that has rapid hardening, can be easily manufactured, and can be provided at low cost, Patent Document 1 contains a predetermined amount of fine slag powder, alumina cement, and anhydrous gypsum based on Portland cement, and further a setting controller. A fast-hardening cement composition to which a predetermined amount is added is disclosed.

  Further, as a self-fluidity (self-leveling) composition having excellent fluidity, Patent Document 2 discloses a hydraulic component composed of alumina cement, Portland cement and gypsum, blast furnace slag, water reducing agent and / or water increasing agent. A self-flowing hydraulic composition using a blast furnace slag having an average particle diameter in a predetermined range is disclosed.

Japanese Patent Publication No. 2-15507 JP 2008-30985 A

  In recent years, there has been a demand for further improvement in the performance of a horizontal and smooth floor surface obtained from a self-flowing hydraulic composition. Therefore, the present invention has excellent workability and surface smoothness (flatness due to high fluidity). ), A method of producing a self-flowing hydraulic composition having surface horizontality, fast curing, etc., and particularly excellent in surface smoothness (flatness).

  In order to solve the above problems, the present inventors have studied the surface state of the self-flowing hydraulic composition in detail, and as a result, mixed the admixture and the extender in the first production process. A self-flowing hydraulic composition having the desired excellent characteristics can be obtained by mixing the base material, the intermediate composition and the antifoaming agent in the second step. As a result, the present invention has been completed.

  That is, the present invention includes a first production process for producing an intermediate composition by mixing an admixture containing a fluidizing agent, a thickening agent and a modified silicone oil, and an extender, Portland cement, alumina cement, gypsum A second production step of producing a self-flowing hydraulic composition by mixing a base material composed of inorganic powder and fine aggregate, an intermediate composition, and an antifoaming agent, and an intermediate product Does not contain an antifoaming agent as an admixture, and the filler is at least one selected from Portland cement, alumina cement, gypsum, blast furnace slag fine powder, limestone fine powder and fine aggregate, and is a self-flowing hydraulic composition The hydraulic component is 5 to 55% by mass of Portland cement, 10 to 60% by mass of alumina cement and 10 to 60% by mass of gypsum, and the inorganic powder is selected from blast furnace slag fine powder and limestone fine powder It is a top, to provide a method for manufacturing a self-flowable hydraulic compositions.

  According to the method for producing a self-flowing hydraulic composition of the present invention, the obtained hydraulic composition has excellent workability due to high fluidity, surface smoothness (flatness), surface horizontality, fast curing, and the like. In particular, excellent surface smoothness (flatness) can be obtained.

  Preferred embodiments [(1) to (4)] of the method for producing the self-flowing hydraulic composition of the present invention are shown below. In the present invention, it is preferable to appropriately combine these aspects.

  (1) It is preferable that it is 100-500 mass parts of fillers with respect to 100 mass parts of admixtures. Thereby, each material is mixed more homogeneously and the intermediate composition excellent in homogeneity can be obtained. Moreover, the surface smoothness (flatness) of the self-flowing hydraulic composition is further improved.

  (2) It is preferable that the fine aggregate has a coarse particle ratio of 0.60 to 1.40 and a water absorption of 1.6% or less. Thereby, the self-fluidity of the self-fluidic hydraulic composition can be further improved.

  (3) It is 10-200 mass parts of inorganic powder with respect to 100 mass parts of hydraulic components, and it is preferable that it is 70-300 mass parts of fine aggregates. Thereby, more excellent fluidity and curing characteristics can be obtained.

  (4) It is preferable that it is 0.005-3.5 mass parts of antifoaming agents with respect to 100 mass parts of hydraulic components. Thereby, more excellent surface smoothness (flatness) can be obtained.

  According to the present invention, it has excellent workability due to high fluidity, surface smoothness (flatness), surface horizontality, fast hardness, etc., and in particular, self-flow that provides excellent surface smoothness (flatness). A method for producing a water-soluble hydraulic composition can be provided.

It is a perspective view of SL measuring device used for self-leveling property evaluation. (A) It is sectional drawing which shows the state with which the SL measuring device was filled with the slurry, and (b) the state which pulled up the weir board and the slurry flowed.

  A preferred embodiment of the method for producing a self-flowing hydraulic composition of the present invention will be described below.

<Manufacturing method>
The manufacturing method of the self-flowing hydraulic composition of the present embodiment includes a first manufacturing process for manufacturing an intermediate composition that does not include an antifoaming agent, and a self-flowing hydraulic composition that includes the intermediate composition and the antifoaming agent. A second manufacturing process for manufacturing a product. Hereinafter, each process in the manufacturing method of the self-fluid hydraulic composition of this embodiment is demonstrated in detail.

  In the first production process, an admixture containing a fluidizing agent, a thickener and a modified silicone oil and an extender are mixed as materials to produce an intermediate product which does not contain an antifoaming agent.

  For mixing the materials, a mixer capable of mixing materials such as an Eirich mixer, a Nauter mixer, a ribbon mixer, and a rocking mixer can be used.

  The order of feeding materials to the mixer is not particularly limited, a method of mixing all the materials at once after mixing them into the mixer, a method of charging materials into the mixer in order while mixing, A method of repeating mixing and stopping each time one material is fed into the mixer may be used, but it is preferable to feed from a powder material having a large amount of blending because it is easy to mix uniformly in a short time. Moreover, when a liquid material is contained, it is preferable to add after adding powder material. In particular, it is preferable to add and mix the liquid material after mixing all the powder materials in advance with a mixer because the liquid material is easily mixed homogeneously. A method for adding the liquid material is not particularly limited, but a method of adding it in the form of small droplets using a sprayer or the like is preferable because it can be more uniformly mixed.

  The obtained intermediate composition may be used as a material in the second production process all at once, or may be used by weighing a predetermined amount.

  The intermediate composition includes, as materials, an admixture containing a fluidizing agent, a thickening agent and a modified silicone oil, and an extender, and does not contain an antifoaming agent.

  The type of fluidizing agent is not particularly limited, and has a water reducing effect, such as formaldehyde condensate of melamine sulfonic acid, casein, calcium caseinate, polycarboxylic acid, polyether, and polyether polycarboxylic acid. Any commercially available fluidizing agent can be used regardless of the type, and in particular, it is preferable to use a commercially available fluidizing agent such as polyether-based and polyetherpolycarboxylic acid-based, since it exhibits a high water reducing effect with a small addition amount. .

The fluidizing agent can be appropriately added in a range not impairing the characteristics depending on the hydraulic component to be used, and with respect to 100 parts by mass of the hydraulic component,
Preferably 0.01 to 2.0 parts by weight,
More preferably 0.02-1.0 parts by mass,
More preferably 0.05 to 0.50 parts by mass,
Especially preferably, it is 0.08-0.30 mass part.
If the addition amount of the fluidizing agent is too small, a suitable effect (excellent fluidity and high cured body strength) will not be exhibited, and if the addition amount is too large, an effect commensurate with the addition amount cannot be expected, and it is simply ineffective. Not only is it economical, but in some cases the viscosity becomes large and the amount of kneading water for obtaining the required fluidity increases, which may deteriorate the strength properties.

  The type of thickener is not particularly limited. Thickeners such as cellulose, modified starch such as starch ether and guar gum, protein, latex, and water-soluble polymer may be used alone or in combination. Can be used. A cellulose-based thickener is more preferable from the viewpoints of availability and handling and surface smoothness.

The thickener has a viscosity of 1% by weight aqueous solution at 20 ° C. measured with a B-type viscometer,
Preferably, it is 2500 to 50000 mPa · s,
More preferably, it is 5000-40000 mPa · s,
More preferably, it is 7500-35000 mPa · s,
Particularly preferably, it is 10,000 to 30,000 mPa · s.
The thickener has a viscosity of 2% by weight aqueous solution at 20 ° C. measured with a B-type viscometer.
Preferably it is 5000-60000 mPa · s,
More preferably, it is 10,000 to 50000 mPa · s,
More preferably, it is 15000-45000 mPa * s,
Especially preferably, it is 20000-40000 mPa * s.
Thereby, surface smoothness (flatness) and surface levelness can be obtained while having excellent workability due to high fluidity. In particular, excellent surface characteristics can be obtained that have high fluidity and do not cause surface powdering or surface irregularities due to material separation or surface water floating.

  The viscosity of the thickener can be obtained by measuring an aqueous solution (20 ° C.) containing 1% by mass of the thickener using a B-type viscometer.

The thickener is based on 100 parts by weight of the hydraulic component.
Preferably 0.01 to 1.00 parts by mass,
More preferably, it is 0.05 to 0.75 parts by mass,
More preferably 0.08 to 0.50 parts by mass,
Especially preferably, it is 0.10-0.20 mass part.
Thereby, surface smoothness (flatness) and surface levelness can be obtained while having excellent workability due to high fluidity. In particular, excellent surface characteristics can be obtained that have high fluidity and do not cause surface powdering or surface irregularities due to material separation or surface water floating.

  The type of the modified silicone oil is not particularly limited, but is preferably one in which a part of the side chain of the straight silicone oil is modified with an organic group. As the organic group, those having reactivity such as monoamine group, diamine group, amino group, epoxy group, carbinol group, mercapto group, carboxyl group, hydrogen group and the like are preferable. Among these, a modified silicone oil obtained by modifying a part of the side chain with a hydrogen group is more preferable. Thereby, the fall of the hydration activity of the hydraulic component in storage can be suppressed, and the effect outstanding with respect to an alumina cement is shown especially.

The modified silicone oil is based on 100 mass hydraulic components.
Preferably it is 0.0005 to 0.10 parts by mass,
More preferably 0.001 to 0.07 parts by mass,
More preferably 0.005 to 0.06 parts by mass,
Most preferably, it is 0.01-0.05 mass part.
When the modified silicone oil is in the above-mentioned range, it is possible to suppress a decrease in the hydration activity of the hydraulic component during storage, and in particular, an excellent effect on alumina cement is exhibited.

  The filler is at least one selected from Portland cement, alumina cement, gypsum, blast furnace slag fine powder, limestone fine powder and fine aggregate. When mixed, each material (admixture) in the intermediate composition is homogeneous. It is a mixing aid used to disperse the material. Therefore, from the viewpoint of quality stability, the filler is the same as the base material used in the second manufacturing process from the group consisting of Portland cement, alumina cement, gypsum, blast furnace slag fine powder, limestone fine powder and fine aggregate. It is preferable to select and use the material. Further, from the viewpoint of the homogeneity of the admixture, it is preferable to add more filler than the admixture (total of all admixtures contained in the intermediate composition).

  The filler is preferably 100 to 500 parts by weight, more preferably 150 to 400 parts by weight, still more preferably 180 to 350 parts by weight, and particularly preferably 200 parts per 100 parts by weight of the admixture. -300 parts by mass.

  Detailed description of Portland cement, alumina cement, gypsum, blast furnace slag fine powder, limestone fine powder and fine aggregate will be described later.

  In the intermediate composition in the method for producing a self-flowing hydraulic composition of the present embodiment, in addition to the above essential components, a coagulation adjusting agent or the like can be appropriately added as long as the characteristics of the present invention are not impaired. .

  The setting modifier includes a setting accelerator that accelerates the hydration reaction of the hydraulic component and a setting retarder that delays the hydration reaction of the hydraulic component. Depending on the combination of the hydraulic component used, The addition amount can be appropriately selected.

  A well-known thing can be used as a setting retarder. For example, organic acids such as oxycarboxylic acids, sugars such as glucose, maltose, dextrin, sodium bicarbonate, sodium phosphate, etc. may be used alone or in combination of two or more components. it can.

  Oxycarboxylic acids include oxycarboxylic acids and their salts. Examples of oxycarboxylic acid include citric acid, gluconic acid, tartaric acid, glycolic acid, lactic acid, hydroacrylic acid, α-oxybutyric acid, glyceric acid, tartronic acid, malic acid and other aliphatic oxyacids, salicylic acid, m-oxy Mention may be made of aromatic oxyacids such as benzoic acid, p-oxybenzoic acid, gallic acid, mandelic acid and tropic acid.

  Examples of the salt of oxycarboxylic acid include alkali metal salts (specifically sodium salt and potassium salt) and alkaline earth metal salts (specifically calcium salt, barium salt and magnesium salt). Sodium salts are more preferred. In particular, sodium tartrate is preferred from the standpoint of setting delay effect, availability, and price, and more preferably used in combination with sodium bicarbonate.

The setting retarder is based on 100 parts by mass of the hydraulic component.
Preferably 0.01 to 2.0 parts by weight,
More preferably 0.05 to 1.5 parts by mass,
More preferably 0.08-1.2 parts by mass,
The pot life (handling time) with which suitable fluidity | liquidity is acquired can be ensured by using especially preferably in the range of 0.10-1.0 mass part.

  As the setting accelerator, a known component for promoting setting can be used. For example, lithium salt, aluminum sulfate, sodium aluminate and calcium chloride having a setting acceleration effect can be suitably used, and these can be used in combination.

  Examples of lithium salts include inorganic lithium salts such as lithium carbonate, lithium chloride, lithium sulfate, lithium nitrate and lithium hydroxide, and organic acid organics such as lithium oxalate, lithium acetate, lithium tartrate, lithium malate and lithium citrate. A lithium salt can be mentioned. In particular, lithium carbonate is preferable from the viewpoint of the setting acceleration effect, availability, and cost.

The setting accelerator is based on 100 parts by mass of the hydraulic component.
Preferably 0.01 to 1.0 parts by weight,
More preferably, 0.01 to 0.5 parts by mass,
More preferably 0.02-0.4 parts by mass,
It is particularly preferable to use it in the range of 0.03 to 0.3 parts by mass because a suitable quick setting can be obtained after securing the pot life of the self-flowing hydraulic composition.

  In the second manufacturing process, as a material, a self-flowing hydraulic composition is prepared by mixing a base material made of Portland cement, alumina cement, gypsum, inorganic powder and fine aggregate, an intermediate composition, and an antifoaming agent. Manufacturing.

  For mixing the materials, a mixer capable of mixing materials such as an Eirich mixer, a Nauter mixer, a ribbon mixer, and a rocking mixer can be used.

  The order in which materials are charged into the mixer is not particularly limited, and all the materials are charged into the mixer at once and then mixed for a predetermined time, or the materials are charged into the mixer in order while mixing. The method and the method of repeating mixing and stopping each time a single material is introduced into the mixer may be used, but it is easier to mix homogeneously in a short time if the maximum particle size is large and the amount of the compounded material is charged. Therefore, it is preferable. Moreover, when a liquid material is contained, it is preferable to add after adding powder material. In particular, it is preferable to add a liquid material after adding a powder material having a large maximum particle size and a large amount of blending because the liquid material is easily mixed homogeneously. A method for adding the liquid material is not particularly limited, but a method of adding it in the form of small droplets using a sprayer or the like is preferable because it can be more uniformly mixed.

  As the Portland cement, normal Portland cement, early-strength Portland cement, ultra-high-strength Portland cement, moderately hot Portland cement, low heat Portland cement and sulfate-resistant Portland cement can be used. Moreover, mixed cements such as blast furnace cement, fly ash cement, silica cement and the like can be used as an alternative. From the viewpoint of quick setting, it is preferable to use ordinary Portland cement, early-strength Portland cement, or ultra-early-strength Portland cement.

Several types of alumina cement having different mineral compositions are known and commercially available, but their main component is monocalcium aluminate (CA), and commercially available products can be used regardless of the type. Especially, it is preferable to use the alumina cement which has a Blaine specific surface area of 4000-6000 cm < ² > / g. The brane specific surface area of the alumina cement is determined according to JIS R 2521: 1995.

  Examples of the gypsum include dihydrate gypsum, hemihydrate gypsum, and anhydrous gypsum, and any gypsum produced as a by-product in flue gas desulfurization or hydrofluoric acid production process or naturally produced gypsum can be used. it can. From the viewpoint of workability (high fluidity, long pot life), it is preferable to use anhydrous gypsum.

  By using a hydraulic component composed of the above-mentioned Portland cement, alumina cement, and gypsum, it is possible to obtain a cured body having excellent self-fluidity, proper pot life, excellent quick hardening, and small volume change. .

  The hydraulic component is 5 to 55% by mass of Portland cement, 10 to 60% by mass of alumina cement, and 10 to 60% by mass of gypsum. When the blending ratio of Portland cement, alumina cement and gypsum is within the above range, a cured material having a low material cost, excellent self-fluidity, excellent quick-hardness, and a small volume change during curing is obtained. Becomes easy.

The blending ratio of hydraulic component is
Preferably, Portland cement is 10 to 49% by mass, Alumina cement is 17 to 57% by mass and Gypsum is 14 to 54% by mass,
More preferably, Portland cement 15-44% by weight, alumina cement 22-52% by weight and gypsum 19-49% by weight,
More preferably, Portland cement 19-39% by mass, alumina cement 27-47% by mass and gypsum 24-44% by mass,
Particularly preferred are Portland cement 24-34 mass%, alumina cement 32-42 mass% and gypsum 29-39 mass%.

  The inorganic powder is at least one selected from blast furnace slag fine powder and limestone fine powder defined in JIS A 6206 “Blast furnace slag fine powder for concrete”. Here, the limestone fine powder can be suitably used by pulverizing limestone, but if it is an inorganic powdery substance mainly composed of calcium carbonate, it is obtained by pulverizing waste concrete or the like and chemically purified. Calcium carbonate or the like can be substituted. By using blast furnace slag fine powder and / or limestone fine powder as the inorganic powder, strength development and dimensional stability can be enhanced.

Further, these inorganic powders have a specific surface area of branes measured according to JIS R 5201 “Physical Test Method for Cement”.
Preferably it is 3000 cm ² / g or more,
More preferably, it is 3000-8000 cm < ² > / g,
More preferably, it is 3500-6000 cm ² / g,
Especially preferably, it is 4000-5000 cm < ² > / g.
When the brain specific surface area is in the above range, more excellent fluidity retention, strength development and dimensional stability can be obtained.

  The fine aggregate has a maximum particle diameter of 850 μm or less, and preferably contains less than 5 mass% of coarse particles having a particle diameter of more than 600 μm in 100 mass% of the fine aggregate. Such fine aggregates can be appropriately selected from sands such as quartz sand, river sand, land sand, sea sand, crushed sand, slag fine aggregate, regenerated fine aggregate, and alumina clinker. In particular, as the fine aggregate, those selected from sands such as quartz sand, river sand, land sand, sea sand and crushed sand, and alumina clinker can be suitably used.

  The particle diameter of the fine aggregate can be measured by using several sieves having different nominal dimensions as defined in JIS Z 8801: 2006. In the present invention, the term “coarse fraction having a particle diameter of more than 600 μm” refers to the mass ratio of particles on the sieve residue when a 600 μm sieve is used.

If the fine aggregate contains 5% by mass or more of coarse particles having a particle diameter of more than 600 μm, the self-fluidity of the self-leveling material tends to be reduced. The lower limit of the coarse particles is not particularly limited, and may be 0% by mass. In order to obtain excellent self-fluidity, the coarse particles in the fine aggregate
More preferably, it is 0 to 3% by mass.
More preferably, it is 0-0.5 mass%,
Especially preferably, it is 0-0.15 mass%.

  It is preferable that the coarse aggregate ratio of the fine aggregate is in the range of 0.60 to 1.40, and the water absorption is 1.6% or less. Thereby, more excellent self-fluidity can be obtained.

  Here, the “rough grain ratio” refers to the coarse grain ratio of the aggregate as defined in JIS A 1102: 2006. Further, the “water absorption rate” refers to a value measured according to the method for measuring the water absorption rate (unit:%) of an aggregate defined in JIS A 1109: 2006.

As the coarse particle ratio of fine aggregate,
More preferably, it is 0.68-1.35,
More preferably, it is 0.72-1.28,
Especially preferably, it is 0.74-1.25.
Further, the lower limit value of the water absorption rate is not particularly limited, and may be 0%. The water absorption rate of fine bone agent is
More preferably 1.40% or less,
More preferably, it is 1.20% or less,
Particularly preferably, it is 1.00% or less.

  The inorganic powder and fine aggregate used in the present invention are 10 to 200 parts by mass of inorganic powder and preferably 70 to 300 parts by mass of fine aggregate with respect to 100 parts by mass of the hydraulic component. Thereby, fluidity | liquidity (workability | operativity) and a hardening characteristic can be improved more.

The inorganic powder is based on 100 parts by mass of the hydraulic component.
More preferably, 20 to 150 parts by mass,
More preferably, 30-100 mass parts,
Especially preferably, it is 40-80 mass parts.

Fine aggregate is 100 parts by weight of hydraulic component,
More preferably, 80 to 250 parts by mass,
More preferably 90-220 parts by mass,
Especially preferably, it is 100-200 mass parts.

  When the inorganic powder and the fine aggregate are within the above ranges, the fluidity (workability) and the curing characteristics can be further improved.

  As the antifoaming agent, known materials such as silicone-based, alcohol-based, polyether-based synthetic materials, mineral oil-based materials, plant-derived natural materials, and the like can be used alone or in combination of two or more.

The amount of antifoaming agent added is 100 parts by weight of the hydraulic component.
Preferably it is 0.005 to 3.5 parts by mass,
More preferably, it is 0.01 to 2.0 parts by mass,
More preferably, it is 0.03 to 1.5 parts by mass,
Especially preferably, it can use in 0.05-1.0 mass part. The addition amount of the antifoaming agent is preferably within the above range because a suitable antifoaming effect is observed.

  In addition, by mixing the antifoaming agent in the first manufacturing process and mixing it in the second manufacturing process, the original effect can be exhibited without deteriorating the performance of the antifoaming agent. (Flatness) can be obtained.

  In the second manufacturing process, a fine aggregate having a large maximum particle size and a large amount is added to the mixer, and then the total amount or a predetermined amount of the intermediate composition obtained in the first manufacturing process is charged for a certain period of time. A method of mixing and then mixing the remaining materials (base materials) is particularly preferable. Further, the order of charging the remaining materials is not particularly limited.

  The self-flowing hydraulic composition obtained by the production method of the present embodiment has excellent workability due to high fluidity, surface smoothness (flatness), surface horizontality, quick hardening, etc. Since it has excellent surface characteristics (flatness), it can be used as a floor foundation for schools, condominiums, convenience stores, hospitals and the like.

  A self-flowing hydraulic mortar can be manufactured by mixing and stirring the self-flowing hydraulic composition obtained by the manufacturing method of the present embodiment with a predetermined amount of water. By adjusting the amount of water added, the fluidity, material separability, and curing characteristics of the self-flowing hydraulic mortar can be adjusted.

The self-flowing hydraulic mortar has a mass ratio (W / S) between water (W) and the self-flowing hydraulic composition (S).
Preferably 0.21 to 0.29,
More preferably 0.22 to 0.28,
More preferably 0.23 to 0.27,
It can mix | blend and knead | mix so that it may become the range of 0.24-0.26 especially preferably.

From the viewpoint of fluidity of self-flowing hydraulic mortar, the flow value is
Preferably it is 190 mm-260 mm,
More preferably, it is 200 mm to 250 mm,
More preferably, it is 210-240 mm,
Especially preferably, it is 215-235 mm.
When the flow value is in the above range, the fluidity is suitable and the cured body surface excellent in excellent workability and horizontality tends to be obtained.

  Moreover, the self-leveling property of the self-flowing hydraulic mortar can be evaluated using the SL measuring device shown in FIG.

  FIG. 1 is a perspective view schematically showing an SL measuring instrument used for self-flowing hydraulic mortar self-leveling evaluation. The SL measuring instrument 10 is made of synthetic resin and has an internal dimension of 30 mm width × 30 mm height. X It has a bowl shape with a length of 750 mm, and only one end is an open end. And the SL measuring device 10 dams the filling part 11 for filling the self-flowing hydraulic mortar on the closed end side and the self-flowing hydraulic mortar to be filled adjacent to the filling part 11. The filling section 11 has a capacity of 30 mm width × 30 mm height × 150 mm length.

  FIG. 2 is a cross-sectional view schematically showing a method for evaluating the self-leveling property of a self-flowing hydraulic mortar using the above-described SL measuring device. First, as shown in FIG. 2A, the self-flowing hydraulic mortar immediately after kneading is poured so as to fill the filling portion 11. Next, when the weir plate 12 is pulled up, as shown in FIG. 2B, the poured self-flowing hydraulic mortar flows out toward the opening end side of the SL measuring device 10. Here, when the weir plate 12 is pulled up immediately after the filling part 11 is filled with the self-fluid hydraulic mortar, it is expressed as L0, and when the weir plate 12 is pulled up after 20 minutes and 30 minutes, This is represented as L30.

  The time required for the self-flowing hydraulic mortar that has flowed out to flow a distance of 200 mm from the mark 13 is the SL flow time (seconds), and from the mark 13 to the end point 14 where the flow of the self-flowing hydraulic mortar has stopped. Is the SL value (mm). By measuring the SL flow time and SL value, the self-leveling property of the self-flowing hydraulic mortar can be evaluated.

Immediately after pouring the self-flowing hydraulic mortar into the filling part 11, the weir plate 12 is pulled up, and the flow time (L0) in which the self-flowing hydraulic mortar flows through a distance of 200 mm is in an environment of a temperature of 20 ° C.
Preferably it is 3 to 35 seconds,
More preferably 6 to 30 seconds,
More preferably, it is 8 to 27 seconds,
Particularly preferred is 10 to 25 seconds.

The SL value (L0) of the self-flowing hydraulic mortar is 20 ° C.
Preferably it is 400-600mm,
More preferably, it is 420-580 mm,
More preferably, it is 440-560 mm,
Especially preferably, it is 450-550 mm.

The SL value (L30) of the self-flowing hydraulic mortar is 20 ° C,
Preferably it is 300-550 mm,
More preferably, it is 350-530 mm,
More preferably, it is 380-510 mm,
Especially preferably, it is 400-500 mm.

  Self-fluid hydraulic mortar begins to harden within 1 to 2.5 hours after the end of pouring, depending on the temperature and humidity conditions at the construction site (water pulling: surface water of self-fluid hydraulic mortar The surface hardness of the self-flowing hydraulic mortar cured body increases with the progress of curing, and the moisture content on the surface of the cured body tends to decrease.

The shore hardness of the surface of the cured body after 3 hours formed by casting a self-flowing hydraulic mortar and finishing the surface is 20 ° C.
Preferably it is 1 or more,
More preferably 10 or more,
More preferably, it is 20 or more,
Especially preferably, it is 30 or more.

  The upper limit of the Shore hardness is not particularly limited, but is about 100 which is the measurement limit value of the Shore hardness meter. When the Shore hardness of the surface of the self-flowing hydraulic mortar cured body is in the above range, the concrete floor structure is formed by the rapid hardening after the self-flowing hydraulic mortar construction (placement and finishing) is completed. It becomes easier to form the body in a short time.

  The surface on which the self-flowing hydraulic mortar is cured is required to have horizontality and smoothness (flatness). In particular, it is necessary not to emit bubble traces or surface irregularities (fine irregularities are formed on the surface) that cause a decrease in adhesion when constructing a stretch or painted floor on the cured body surface. is there. It is preferable that the surface of the cured body is not visually felt by touching the surface of the cured body with eyes or fingers.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment.

  The contents of the present invention will be specifically described below with reference to examples. Note that the present invention is not limited to these examples.

[Materials used]
The materials used in Examples and Comparative Examples are described below.

(1) Antifoaming agent Antifoaming agent A (polyether surfactant, manufactured by San Nopco)
Antifoam B (polyether surfactant, mineral oil, manufactured by ADEKA)

<Intermediate composition>
(1) Bulking material Portland cement [PC] (early strong Portland cement, manufactured by Ube Mitsubishi Cement Co., Ltd., Blaine specific surface area 4500 cm ² / g)
(2) Fluidizing agent Polycarboxylic acid based fluidizing agent (Kao Corporation)
(3) Thickener Cellulosic thickener (Matsumoto Yushi Co., Ltd., viscosity 18380 mPa · s)

  The viscosity of the thickener was measured using a B-type viscometer (Digital Viscometer manufactured by Tokyo Keiki Co., Ltd .: DVL-B). 4. Measurement was performed under the condition of a rotor rotational speed of 12 rpm.

(4) Modified silicone oil (manufactured by Shin-Etsu Chemical Co., Ltd., modified silicone oil in which a part of the side chain is modified with a hydrogen group)
(5) Setting modifier Delay agent A: Sodium tartrate Delay agent B: Sodium bicarbonate Accelerator A: Lithium carbonate Accelerator B: Aluminum sulfate

<Base material>
(1) Hydraulic component Portland cement [PC] (early strength Portland cement, manufactured by Ube Mitsubishi Cement Co., Ltd., Blaine specific surface area 4500 cm ² / g)
Alumina cement [AC] (Fonju, Kerneos, Blaine specific surface area 3100 cm ² / g)
Gypsum [GG] (Natural anhydrous gypsum, Blaine specific surface area 3880 cm ² / g)
(2) Inorganic powder Blast furnace slag fine powder (manufactured by Chiba Riverment Co., Blaine specific surface area 4400 cm ² / g)
(3) Fine aggregate Silica sand (coarse fraction having a particle diameter of more than 600 μm = 0.12 mass%, coarse grain ratio = 1.20%, water absorption = 0.79%)

  As a 1st manufacturing process, the mixing | blending for obtaining an intermediate composition was made into Table 1, and it was set as the mixture ratio with respect to 100 mass parts of hydraulic components in a self-flowing hydraulic composition.

  From Table 1, the retarder used together the retarder A and the retarder B suitably, and the accelerator used the accelerator A and the promoter B suitably together. Moreover, a part of 100 mass parts of hydraulic components was used for the extender (Portland cement) of Table 1. Furthermore, the antifoamer was not mix | blended with the intermediate compositions 1-3.

  The powder materials in the respective formulations shown in Table 1 were preliminarily mixed at the respective mixing ratios, and then liquid materials were added and mixed to obtain intermediate compositions 1 to 7, which were stored in a constant temperature room at 20 ° C. for 1 week.

  As a 2nd manufacturing process, the mixing | blending for obtaining a self-fluid hydraulic composition was made into Table 2, and it was set as the mixture ratio with respect to 100 mass parts of hydraulic components. Here, when the total mass part of PC, AC, and GG which are hydraulic components of Table 2 and the mass part of the extender of Table 1 are added together, it becomes 100 parts by mass.

  Each formulation in Table 2 was mixed to obtain a self-flowing hydraulic composition.

[Preparation of self-flowing hydraulic mortar]
1.5 kg was taken from the self-flowing hydraulic composition, 375 g of water was added, and kneaded for 3 minutes using a chemistor to obtain a self-flowing hydraulic mortar. The self-flowing hydraulic mortar was prepared in a thermostatic chamber at a temperature of 20 ° C.

[Flow value]
The flow value was measured according to JASS 15M-103 “The Architectural Institute of Japan: Quality standards for self-leveling materials”. The measurement was performed in a constant temperature room at a temperature of 20 ° C. Table 3 shows the measurement results.

[Self-leveling (SL) value]
The self-flowing hydraulic mortar immediately after kneading into the filling part 11 of the SL measuring device 10 shown in FIG. 1 is pulled up immediately after pouring, and the self-flow flowing out from the filling part 11 as shown in FIG. After the flow of the hydraulic hydraulic mortar stopped, the distance from the reference point (dam plate installation portion) 13 to the end point 14 where the flow of the self-flowing hydraulic mortar stopped was measured as the SL value (mm). In addition, the SL flow time (second / 200 mm) required for the self-flowing hydraulic mortar to flow a distance of 200 mm from the mark 13 was measured. Table 3 shows the measurement results.

[Air volume]
Measured in accordance with JIS A 1171: 2000 “Testing Method for Polymer Cement Mortar” 6.4 Air Content Test. A Maruto-made mortar air meter was used for the measurement. Table 3 shows the measurement results.

[Watering time]
The prepared self-flowing hydraulic slurry was poured into a synthetic resin container having an inner dimension of width 130 × length 190 × height 17 mm so as to have a thickness of 15 mm. The time when disappearance of light (the state where the reflection of light was lost and clouded) was measured as watering time. Table 3 shows the measurement results.

[surface hardness]
After a predetermined elapsed time from the placement of the self-flowing hydraulic slurry, the hardness of the hardened surface (Shore hardness) is changed to any 4 using a spring type hardness meter type D type (manufactured by Ueshima Seisakusho Co., Ltd.). The surface hardness of the place was measured, and the average value of the reading values of the spring type hardness tester type D gauge was defined as the surface hardness at that time. In this example and comparative examples, the Shore hardness after 3 hours and 24 hours was measured. Table 3 shows the measurement results.

[Surface condition]
The surface condition is as follows. Weirs are provided on the outer periphery of a concrete plate having an outer dimension of width 450 × length 450 × height 30 mm, and the obtained self-flowing hydraulic mortar is poured so as to have a thickness of 15 mm, and after 24 hours. Then, the surface bubble traces and unevenness were evaluated by visual observation or touching with a finger. Here, “bubble marks” are holes on the surface having a diameter of about 0.1 to 0.5 mm, and “unevenness” is the resistance felt when palpating (tracing) the surface with a finger. (Rough feeling). In the evaluation of the bubble trace, “◯” was given when there was no hole, and the diameter and number of holes were given when there was a hole. In the evaluation of smoothness, the case where resistance was not felt at the fingertips after palpation was evaluated as “◯”, and the case where resistance was felt at the fingertips was evaluated as “X”. The measurement was performed in an environment with a temperature of 20 ° C. and a humidity of 65%. The evaluation results are shown in Table 3.

  As shown in Examples 1 to 3 of Table 3, the self-fluidic hydraulic slurry prepared using the self-fluidic hydraulic composition of the present invention exhibits excellent flow value and SL value (fluidity). The time was within 2 hours, and the surface hardness was 10 or more in 3 hours. Further, the surface state was free of bubble marks and irregularities, and excellent surface smoothness (flatness) was obtained.

  On the other hand, in Comparative Examples 1 to 3 of Table 3 in which the antifoaming agent was blended in the first step, bubble marks were generated on the surface, and in Comparative Example 4, the SL value of L30 was lowered.

  From Examples 1 to 3 of the present invention, the admixture excluding the antifoaming agent and the extender are mixed in the first production process to obtain an intermediate composition, and the antifoaming agent is blended in the second production process. Self-flowing hydraulic composition that has excellent workability due to high fluidity, surface smoothness (flatness), surface horizontality, quick hardening, etc., and in particular, excellent surface smoothness (flatness) can be obtained. It was confirmed that

  DESCRIPTION OF SYMBOLS 10 ... SL measuring device, 11 ... Filling part, 12 ... Barrage board, 13 ... Marking point, 14 ... End point.

Claims (5)

A first production step of producing an intermediate composition by mixing an admixture comprising a fluidizing agent, a thickener and a modified silicone oil, and an extender;
A second production process for producing a self-flowing hydraulic composition by mixing a base material made of Portland cement, alumina cement, gypsum, inorganic powder and fine aggregate, the intermediate composition, and an antifoaming agent; Have
The intermediate composition does not contain an antifoam as an admixture,
The filler is at least one selected from Portland cement, alumina cement, gypsum, blast furnace slag fine powder, limestone fine powder and fine aggregate,
The hydraulic component in the self-flowing hydraulic composition consists of 5-55% by weight of Portland cement, 10-60% by weight of alumina cement and 10-60% by weight of gypsum,
The inorganic powder is at least one selected from blast furnace slag fine powder and limestone fine powder,
A method for producing a self-flowing hydraulic composition. The filler is 100 to 500 parts by mass with respect to 100 parts by mass of the admixture.
The manufacturing method of the self-fluid hydraulic composition of Claim 1.   The production of the self-flowing hydraulic composition according to claim 1 or 2, wherein the fine aggregate has a coarse particle ratio of 0.60 to 1.40 and a water absorption of 1.6% or less. Method. The inorganic powder is 10 to 200 parts by mass with respect to 100 parts by mass of the hydraulic component, and the fine aggregate is 70 to 300 parts by mass.
The manufacturing method of the self-fluid hydraulic composition of any one of Claims 1-3.   The manufacturing method of the self-fluid hydraulic composition of any one of Claims 1-4 which is the said antifoamer 0.005-3.5 mass part with respect to 100 mass parts of said hydraulic components. .

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