JP5423103B2 - Self-flowing hydraulic composition - Google Patents

Description

  The present invention can be mainly used for floor foundation adjustment of general buildings, can be obtained by maintaining a stable and high fluidity for a long time in a wide temperature range, excellent in smoothness and surface condition, and fast-curing. The present invention relates to a hydraulic composition having self-fluidity that provides an excellent cured product.

  The hydraulic composition used as a self-leveling material has high fluidity, flow retention and separation resistance to ensure self-smoothness and surface accuracy, fast curing sufficient to enable early opening, construction In view of facilitating the work, it is required that an appropriate pot life can be obtained in a wide temperature range.

As a cement-based composition having good fluidity and filling properties in a wide temperature range, Patent Document 1 includes a combination of a melamine sulfonate-based water reducing agent, a naphthalene sulfonate-based water reducing agent, and a lignin sulfonate-based water reducing agent. The cementitious grout composition used is disclosed. Patent Document 2 discloses a grout admixture and a grout cement composition using a combination of a polycarboxylate-based water reducing agent and a lignin sulfonate-based water reducing agent. Cement-based self-control that prevents cracking due to material separation and drying even when placed in a high temperature environment of around 35 ° C., and does not cause a decrease in strength or whiteness of the construction surface due to dryout. As a leveling material, Patent Document 3 discloses a self-leveling material containing fine aggregate, water-soluble cellulose ether, dispersant and cement having an absolute dry density of 0.2 to 2 g / cm ³ and a water absorption rate of 10 to 500%. ing.

Japanese Patent No. 3894780 JP 2008-189526 A JP 2008-137841 A

  An object of the present invention is to provide a hydraulic composition having a self-fluidity capable of maintaining a stable and high fluidity for a long time in a wide temperature range, excellent in fast curing and horizontal level properties, and obtaining a good surface finish. To do.

A first aspect of the present invention is a hydraulic composition comprising a hydraulic component made of alumina cement, Portland cement and gypsum and a fluidizing agent, wherein the fluidizing agent is a lignin sulfonate-based fluidizing agent and a polycarboxylic acid. The lignin sulfonate-based fluidizing agent is a hydraulic composition comprising a calcium lignin sulfonate and a sodium lignin sulfonate.
The second of the present invention is a hydraulic mortar obtained by kneading the first hydraulic composition of the present invention and water.
3rd of this invention is a concrete floor structure which has the hardening body layer of the 2nd hydraulic mortar of this invention in a surface layer.

The preferable aspect of the hydraulic composition of this invention is shown below. A plurality of preferred embodiments can be combined.
1) The total amount of the fluidizing agent containing calcium lignin sulfonate and sodium lignin sulfonate and the polycarboxylic acid based fluidizing agent is 0.01 to 5.0 parts by mass with respect to 100 parts by mass of the hydraulic component. There is.
2) In 100 mass% of the fluidizing agent, the fluidizing agent containing calcium lignin sulfonate and sodium lignin sulfonate is 45 to 95 mass%, and the polycarboxylic acid based fluidizing agent is 5 to 55 mass%. .
3) It is 20-80 mass% of alumina cement, 5-70 mass% of Portland cement, and 5-45 mass% of gypsum in 100 mass% of hydraulic components.
4) The hydraulic component includes fine aggregates, and further includes at least one component selected from an inorganic component, a setting retarder, a resin powder, a thickener, and an antifoaming agent. The hydraulic mortar prepared by kneading and having self-fluidity.
5) The setting retarder is a sodium salt of an organic acid and / or an inorganic acid.
6) The Shore hardness of the surface of the cured body of the hydraulic mortar prepared by kneading the hydraulic composition and water is 1 or more after 4 hours from the application of the hydraulic mortar.
7) The water-drawing time of the surface of the cured body of the hydraulic mortar prepared by kneading the hydraulic composition and water is 30 minutes to 150 minutes after the construction of the hydraulic mortar.

  The self-fluid hydraulic composition of the present invention includes a lignin sulfonate fluidizer and a polycarboxylic acid fluidizer, and the lignin sulfonate fluidizer includes calcium salt and sodium salt. By using a fluidizing agent containing, a fluidity can be maintained for a long time in a wide temperature range, and a cured product having excellent fast-curing property and horizontal level property and having a good finished surface can be obtained.

It is a schematic diagram which shows the outline of self-leveling evaluation of mortar using SL measuring device.

  The hydraulic composition of the present invention is a hydraulic composition comprising a hydraulic component composed of alumina cement, Portland cement and gypsum and a fluidizing agent, wherein the fluidizing agent comprises calcium lignin sulfonate and lignin sulfonic acid. The present invention relates to a hydraulic composition comprising a fluidizing agent containing a sodium salt and a polycarboxylic acid fluidizing agent.

  In the present invention, a hydraulic component including a cement component and gypsum can be used as the hydraulic component, and Portland cement or alumina cement can be used as the cement component.

Portland cement includes ordinary Portland cement, early-strength Portland cement, super-early-strength Portland cement, medium heat Portland cement, low-heat Portland cement, Portland cement such as white Portland cement, mixed cement such as blast furnace cement, fly ash cement, silica cement, etc. Can be used.

  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 present invention, gypsum is used as one of the hydraulic components. Gypsum functions as a component that retains dimensional stability after the mortar obtained by kneading the hydraulic composition and water is cured.

As the gypsum used in the present invention, any of gypsum produced as a by-product in the hydrofluoric acid production process and the like and gypsum produced in nature can be used.

In the present invention, a hydraulic component made of alumina cement, Portland cement, and gypsum can be used as the hydraulic component, water having excellent self-fluidity, proper pot life, and excellent quick hardening. It is particularly preferable because a hard composition can be obtained.
The composition of the hydraulic component is preferably 20 to 80% by mass of alumina cement, 5 to 70% by mass of Portland cement, and 5 to 45% by mass of gypsum when the total mass of alumina cement, Portland cement and gypsum is 100% by mass. It is. The composition of the hydraulic component is more preferably 25 to 70% by mass of alumina cement, 15 to 60% by mass of Portland cement, and 10 to 40% by mass of gypsum. The composition of the hydraulic component is more preferably 30 to 60% by mass of alumina cement, 20 to 50% by mass of Portland cement, and 15 to 35% by mass of gypsum. The composition of the hydraulic component is particularly preferably 35 to 45% by mass of alumina cement, 30 to 40% by mass of Portland cement and 20 to 30% by mass of gypsum. By using a hydraulic composition having such a composition, a hydraulic mortar excellent in self-fluidity can be obtained, and further, it has fast curing, low shrinkage or low expansion, and a small volume change during curing. It is preferable because a cured product can be easily obtained.

In the hydraulic composition of the present invention, the fine aggregate is preferably 50 to 500 parts by mass, more preferably 100 to 400 parts by mass, still more preferably 150 to 300 parts by mass, particularly preferably 100 parts by mass of the hydraulic component. Contains 150-250 parts by weight.
As the fine aggregate, an aggregate having a particle size of 2 mm or less, preferably an aggregate having a particle size of 0.1 to 2 mm, more preferably an aggregate having a particle size of 0.2 to 2 mm, particularly preferably 0.3 to 2 mm. Aggregate is the main component.
Fine aggregates include silica sand, river sand, sea sand, mountain sand, crushed sand, etc., alumina clinker, silica powder, clay mineral, waste FCC catalyst, inorganic materials such as limestone, crushed urethane, EVA foam, foaming resin A resin pulverized product such as can be used.
In particular, as fine aggregates, sand such as quartz sand, river sand, sea sand, mountain sand, crushed sand, waste FCC catalyst, quartz powder, alumina clinker and the like can be preferably used.
The particle size of the fine aggregate is measured using several sieves having different nominal dimensions as defined in JIS Z 8801.

The hydraulic composition uses a fluidizing agent (a water reducing agent such as a high performance water reducing agent) that ensures suitable fluidity while suppressing material separation.
Since the expression strength of alumina cement, which is a hydraulic component, is greatly affected by the water / cement ratio, it is particularly preferable to reduce the water / hydraulic component ratio by using a fluidizing agent having a water reducing effect.
The fluidizing agent is a fluidizing agent containing lignin sulfonic acid calcium salt and lignin sulfonic acid sodium salt, such as formaldehyde condensate of melamine sulfonic acid, casein, calcium caseinate, polyether type, polyether polycarboxylic acid type, etc. Use with a fluidizer. As for the fluidizing agent used in combination with a fluidizing agent containing lignin sulfonic acid calcium salt and lignin sulfonic acid sodium salt, a commercially available fluidizing agent can be used regardless of the type, particularly in combination with a polycarboxylic acid based fluidizing agent. It is preferable that suitable flow characteristics can be obtained stably.
The fluidizing agent can be appropriately added according to the hydraulic component to be used within a range that does not impair the characteristics, and is 0.01 to 5.0 parts by mass, more preferably 0 with respect to 100 parts by mass of the hydraulic component. 0.05 to 3.0 parts by mass, more preferably 0.1 to 2.0 parts by mass, and particularly preferably 0.2 to 1.0 parts by mass. Further, when the total mass of the fluidizing agent containing lignin sulfonic acid calcium salt and lignin sulfonic acid sodium salt and the polycarboxylic acid-based fluidizing agent is 100% by mass, lignin sulfonic acid calcium salt and lignin sulfonic acid sodium are preferable. 50-90% by mass of a fluidizing agent containing a salt, 10-50% by mass of a polycarboxylic acid-based fluidizing agent, more preferably 55-85% by mass of a fluidizing agent containing calcium lignin sulfonate and sodium lignin sulfonate. 15 to 45% by mass of a polycarboxylic acid-based fluidizing agent, particularly preferably 60 to 80% by mass of a fluidizing agent containing calcium lignin sulfonate and sodium lignin sulfonate, and 20 to 20% of a polycarboxylic acid-based fluidizing agent. 40% by mass. If the amount added is too small, no suitable effects (excellent fluidity and high cured product strength) will be exhibited, and if the amount added is too large, an effect commensurate with the amount added cannot be expected and it is merely uneconomical. In some cases, the viscosity is increased, and the amount of kneading water for obtaining the required fluidity increases to deteriorate the strength properties.

The hydraulic composition of the present invention includes a hydraulic component composed of alumina cement, Portland cement and gypsum, a fine aggregate, and a fluidizing agent, and further includes an inorganic component, a setting retarder, a setting accelerator, and a thickener. And at least one component selected from antifoaming agents.
The hydraulic composition of the present invention contains at least one inorganic component selected from blast furnace slag fine powder, fly ash and silica fume. Can increase the sex.
In the hydraulic composition, the addition amount of the inorganic component is preferably 10 to 350 parts by mass, more preferably 30 to 200 parts by mass, still more preferably 50 to 150 parts by mass, particularly preferably 100 parts by mass of the hydraulic component. Is preferably 70 to 130 parts by mass.

In the hydraulic composition, the amount of blast furnace slag fine powder added is preferably 10 to 350 parts by mass, more preferably 30 to 200 parts by mass, and still more preferably 50 to 150 parts by mass with respect to 100 parts by mass of the hydraulic component. Most preferably, it is preferable to set it as 70-130 mass parts. If the addition amount of the blast furnace slag fine powder is too small, the drying shrinkage of the cured body increases, and if it is too large, the initial strength may be lowered.
As the blast furnace slag fine powder, those having a brain specific surface area of 3000 cm ² / g or more as defined in JIS A 6206 can be used.

  The setting retarder added to the hydraulic composition of the present invention can be appropriately added within a range that does not impair the characteristics, depending on the hydraulic component used in the hydraulic composition and components other than the hydraulic component. Moreover, the pot life and quick-hardness of the hydraulic composition of this invention can be adjusted by selecting suitably the component, addition amount, and mixing ratio of a setting retarder. The addition of a setting retarder to the hydraulic composition is preferable because it can be very easily used as a self-leveling material (self-flowing mortar).

  As the setting retarder, a known setting retarder can be used. Examples of setting retarders include organic acids such as tartaric acid, malic acid, citric acid, gluconic acid and their salts, sodium sulfate, sodium bicarbonate, sodium phosphate, sodium polyphosphate, sodium tripolyphosphate Inorganic sodium salts such as can be used alone or in combination of two or more components. In particular, from the standpoints of setting delay effect, availability, and cost, the setting retarder is preferably a sodium salt of an organic acid and / or an inorganic acid, and a sodium salt of an organic acid and a sodium salt of an inorganic acid are used in combination. More preferably.

Oxycarboxylic acids include oxycarboxylic acids and their salts. Examples of the 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, and m-oxybenzoic acid. Examples thereof include aromatic oxyacids such as acid, p-oxybenzoic acid, gallic acid, mandelic acid and tropic acid.

Examples of the oxycarboxylic acid salt include alkali metal salts (specifically sodium salt and potassium salt) of oxycarboxylic acid and alkaline earth metal salts (specifically calcium salt, barium salt and magnesium salt). Can be mentioned.

The setting retarder is based on 100 parts by mass of the hydraulic component.
Preferably in the range of 0.01 to 1.5 parts by weight, more preferably in the range of 0.1 to 1.2 parts by weight, still more preferably in the range of 0.2 to 1.0 parts by weight, particularly preferably 0.3. Use in the range of ˜0.8 parts by mass is preferable because the pot life (handling time) for obtaining suitable fluidity can be ensured.
Furthermore, by adjusting the addition amount of the setting retarder to the above preferred range, a mortar having self-fluidity (self-leveling property) and having a pot life (handling time) capable of obtaining suitable fluidity is obtained. It is preferable because it can be obtained.

The hydraulic composition can further contain a resin powder as required.
As a resin powder, it does not specifically limit about manufacturing methods, such as the powdering method of resin, What was manufactured with the well-known manufacturing method can be used. Moreover, as resin powder, what has adhered the antiblocking agent mainly to the surface of resin powder can be used.
As the resin powder, it is preferable to use a re-emulsification type powder resin obtained by removing the solvent by a method such as spraying or freeze-drying an aqueous polymer dispersion.
As the particle size of the resin powder, those having a residue on the 315 μm sieve of 3% or less, a residue on the 300 μm sieve of 3% or less, and particularly a residue of 300% on the sieve of 2% or less can be preferably used.
The resin powder is preferably 0.01 to 5 parts by mass, more preferably 0.1 to 3 parts by mass, still more preferably 0.3 to 2 parts by mass, and particularly preferably 0 to 100 parts by mass of the hydraulic component. What mix | blended 5-1.5 mass parts can be used.

As the resin powder, it is possible to use a powdered resin obtained from one or more kinds of components such as acrylic acid ester, styrene, butadiene, ethylene, vinyl acetate, and vinyl versatate.
The resin powder is preferably a resin powder obtained from a component containing at least one or two selected from vinyl acetate and vinyl versatate, and in particular, vinyl acetate / vinyl versatate, vinyl acetate / vinyl versatate / acrylic. Copolymers such as acid esters, vinyl acetate / vinyl versatic acid / acrylic acid ester / ethylene, vinyl acetate / ethylene, vinyl acetate / acrylic acid ester / ethylene, vinyl vinyl versatate / acrylic acid ester can be preferably used. .

The thickener includes hydroxyethylmethylcellulose, and can be used in combination with other cellulose-based, protein-based, latex-based, and water-soluble polymer-based thickeners other than hydroxyethylmethylcellulose.
The addition amount of the thickener can be added within a range not impairing the characteristics of the present invention, and is preferably 0.001 to 2 parts by mass, more preferably 0.01 to 100 parts by mass with respect to 100 parts by mass of the hydraulic component. It is preferable to include 1.5 parts by mass, more preferably 0.05 to 1 part by mass, particularly 0.1 to 0.6 parts by mass. When the addition amount of the thickener is increased, the mortar viscosity is increased and the fluidity may be lowered. Therefore, it is preferably used in the above preferred range.

  The combined use of a thickener and an antifoaming agent has a favorable effect on suppression of separation of aggregates such as hydraulic components and fine aggregates, suppression of bubble generation, and improvement of the surface of the cured body. It is preferable for improving the properties of the cured product.

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 within a range that does not impair the characteristics of the present invention, and with respect to 100 parts by mass of the hydraulic component,
Preferably it is 0.001-2 mass part, More preferably, it is 0.01-1.5 mass part, More preferably, it is 0.05-1 mass part, It is preferable to contain 0.1-0.5 mass part especially. The addition amount of the antifoaming agent is preferably within the above range because a suitable antifoaming effect is recognized.

In the hydraulic composition of the present invention, in order to further improve the effect of preventing and suppressing dry cracks, a shrinkage reducing agent, silicone oil, etc., in the case of adjusting the pot life and fast curing, etc., a setting accelerator, etc. Can be appropriately selected and used.

As the setting accelerator, a known component that promotes setting can be used, for example, a sulfate such as lithium salt or aluminum sulfate having a setting acceleration effect can be preferably used, and several of these can be combined. Can be used.
Examples of lithium salts include inorganic lithium salts such as lithium carbonate, lithium chloride, lithium sulfate, lithium nitrate, and lithium hydroxide, and organic acid organic lithium salts such as lithium acetate, lithium tartrate, lithium malate, and lithium citrate. Lithium salts can be used. In particular, lithium carbonate is preferable from the viewpoints of the setting acceleration effect, availability, and cost.

As the setting accelerator, it is preferable to use a particle size that does not interfere with the properties, and the particle size is preferably 50 μm or less.
Particularly when a lithium salt is used, the particle diameter of the lithium salt is preferably 50 μm or less, more preferably 30 μm or less, and particularly preferably 10 μm or less. If the particle diameter is larger than the above range, the solubility of the lithium salt decreases, which is not preferable. Then, it may be conspicuous as a large number of fine spots, and the appearance may be impaired.

The setting accelerator is based on 100 parts by mass of the hydraulic component.
Preferably it is 0.01-1 mass part, More preferably, it is 0.01-0.5 mass part, More preferably, it is 0.02-0.4 mass part, Most preferably, it is 0.04-0.3 mass part. By using in this range, after securing the pot life of a hydraulic composition, it is preferable from suitable quick-hardening being obtained.
By adjusting the addition amount of the setting accelerator within the above-mentioned preferable range, a mortar having self-fluidity (self-leveling property) and securing a good pot life is obtained, and a suitable fast-curing property is obtained. This is preferable.

  In the case of constituting the hydraulic composition of the present invention, particularly suitable component constitution is a hydraulic component composed of alumina cement, Portland cement and gypsum, fine aggregate such as dredged sand, fluidizing agent, inorganic component, setting modifier. , Including thickeners and antifoaming agents.

  Mixing hydraulic and inorganic components, fine aggregates, fluidizing agents, inorganic components, setting modifiers, thickeners and antifoaming agents with a mixer to obtain a premix powder of a hydraulic composition it can.

  The premix powder of the hydraulic composition can be mixed and stirred with a predetermined amount of water to produce a hydraulic mortar having self-fluidity, and the hydraulic mortar is cured to A cured product can be obtained.

Hydraulic composition can produce hydraulic mortar by mixing and stirring with water. By adjusting the amount of water added, hydraulic mortar fluidity, pot life, material separability, cured product The strength of the can be adjusted.
The amount of water added to the hydraulic composition of the present invention is preferably 10 to 36 parts by mass, more preferably 12 to 32 parts by mass, more preferably 16 to 28 parts by mass, relative to 100 parts by mass of the hydraulic composition. It is particularly preferable to add and use in the range of 20 to 26 parts by mass.

  In the hydraulic composition of the present invention, the flow value of a self-fluidic hydraulic mortar prepared by mixing with water is preferably adjusted to 190 to 270 mm, more preferably 200 to 260 mm, and particularly preferably 210 to 250 mm. It is preferable for the reason that it is easy to obtain a hardened body surface with high ease of construction and high smoothness.

The hydraulic mortar of the present invention starts curing between 0.5 hours to 2.5 hours after the completion of construction, and the surface hardness of the cured body increases with the progress of curing, and the moisture content of the surface of the cured body increases. descend.
The shore hardness of the hardened body of the hydraulic mortar is preferably 1 or more after 4 hours from the placement (construction) of the mortar. Mortar construction can be completed.

  When the hydraulic composition of the present invention is used as a self-leveling material taking advantage of excellent self-fluidity, it is used in schools, condominiums, convenience stores, hospitals, verandas, factories, warehouses, parking lots, gas stations, kitchens, rooftops, etc. It can be used for flooring and floor finishing materials.

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

(1) Mortar evaluation:
As the mortar used for evaluation, a hydraulic mortar immediately after kneading prepared by kneading a hydraulic composition and water is used.
-Self-leveling property (self-fluidity): flow value and SL value The flow value is measured according to JASS 15M-103. A pipe made of vinyl chloride having an inner diameter of 50 mm and a height of 51 mm (internal volume: 100 ml) is placed on a glass sheet having a thickness of 5 mm, filled with the kneaded hydraulic mortar composition, and then the pipe is pulled up. After the spread has stopped, the diameters in two perpendicular directions are measured, and the average value is taken as the flow value.
The SL value is measured by using an SL (self-leveling) measuring instrument shown in FIG. 1, and a weir plate is provided on a rail having a width of 30 mm × a height of 30 mm × a length of 750 mm at a length of 150 mm from the tip. A predetermined amount of mortar is filled and molded. Immediately after molding, the weir plate is pulled up, and after the mortar flow is stopped, the distance from the reference point (the installation portion of the weir plate) to the shortest portion of the mortar flow is measured, and the value (SL value) is defined as L0.
Similarly, after 3 minutes, 5 minutes or 10 minutes after molding, the weir plate is pulled up, and after the mortar flow is stopped, the distance from the gauge point (weir plate installation part) to the shortest part of the mortar flow is measured, and the value (SL value) is set to L3, L5, or L10.

(2) Watering time After pouring the prepared hydraulic mortar into a 13 cm x 19 cm resin mold at a thickness of 10 mm, the water on the surface of the hydraulic mortar disappears as the condensation starts (the reflection of light is lost and cloudy) The time when the water was removed) was taken as the watering time. The state of the surface of the cured hydraulic mortar was visually evaluated.

(3) Shore hardness of the cured body surface:
In a predetermined elapsed time after placing the hydraulic mortar, the hardness of the hardened surface is measured by using a spring type hardness meter type D type (manufactured by Ueshima Seisakusho Co., Ltd.), and the surface hardness at any four locations is measured. The average value of the reading values of the spring type hardness tester type D gauge is defined as the surface hardness at that time.

(4) Hardened body surface state:
The surface of the cured hydraulic mortar body is prepared by pouring the prepared hydraulic mortar into a 13 cm × 19 cm resin mold at a thickness of 10 mm, and visually observing the surface finish at 24 hours after curing. evaluated. Evaluation was as follows.
○: No irregularities, ×: Irregularities.

The following materials were used.
1) Hydraulic component / alumina cement (Fonju, Kerneos, Blaine specific surface area 3100 cm ² / g).
Portland cement (early strong cement, manufactured by Ube Mitsubishi Cement Co., Ltd., Blaine specific surface area 4500 cm ² / g).
Gypsum a: type II anhydrous gypsum (Asahi Glass Co., Ltd., Blaine specific surface area 3600 cm ² / g).
2) Fluidizing agent / fluidizing agent A: Fluidizing agent containing calcium lignin sulfonate (manufactured by Borregard Deutschland GmbH, LignoTech Wark Karlsruhe)
Fluidizing agent B: Fluidizing agent containing lignin sulfonic acid calcium salt and lignin sulfonic acid sodium salt (manufactured by LignoTech South Africa)
-Fluidizer C: Polycarboxylic acid fluidizer (manufactured by Kao Corporation).
2) Fine aggregate, silica sand: No. 6 silica sand (manufactured by Takano Shoji Co., Ltd.)
4) Inorganic component / blast furnace slag fine powder (Reverment, manufactured by Chiba Riverment Co., Ltd., Blaine specific surface area: 4400 cm ² / g).
5) Setting agent:
-Sodium polyphosphate (manufactured by Organo).
-Sodium tripolyphosphate (manufactured by Taiyo Chemical Industries).
-Bicarbonate Na: Sodium bicarbonate (made by Tosoh Corporation).
-Sodium tartrate: L-sodium tartrate (manufactured by Fuso Chemical Industries).
-Carbonic acid Li: Lithium carbonate (made by Honjo Chemical Co., Ltd.).
6) Thickener: Hydroxyethylmethylcellulose thickener (Marporose MX-30000, manufactured by Matsumoto Yushi Co., Ltd.).
7) Antifoaming agent: polyether type antifoaming agent (manufactured by ADEKA).
8) Resin powder: Copolymer of vinyl acetate / vinyl versatate (manufactured by Nichigo Movinyl).

(Examples and reference examples)
Hydraulic composition obtained by kneading the hydraulic component, fluidizing agent, fine aggregate, inorganic component, setting retarder, thickener and antifoaming agent (total amount: 1.5 kg) shown in Table 1 using a chemistor. Then, 360 g of water was further added and kneaded for 1.5 minutes to obtain a hydraulic mortar. The preparation and curing of the hydraulic composition and hydraulic mortar were carried out in an atmosphere at a temperature of 20 ° C., 30 ° C., 35 ° C., and a relative humidity of 65%.

  Table 2 shows the results of evaluation of SL (self-leveling) characteristics, Shore hardness development, and cured body surface finish using the obtained mortar.

From Comparative Examples 1 to 3 and Example 1 shown in Table 2, except for the case where a fluidizing agent containing calcium lignin sulfonate and sodium lignin sulfonate and a polycarboxylic acid fluidizing agent are used in combination, fluidity, It can be seen that the targets of Shore hardness development and cured surface condition cannot be achieved. Furthermore, when the lignin sulfonic acid calcium salt fluidizer is used, the SL value target at 30 ° C. cannot be satisfied as shown in Comparative Example 4, whereas the lignin sulfonic acid calcium salt and lignin sulfonic acid are not satisfied. When a fluidizing agent containing a sodium salt is used, as shown in Examples 3 and 6, the target can be satisfied not only at 30 ° C. but also at 35 ° C., indicating that temperature dependence is small.
In addition, as can be seen from a comparison between Example 1 and Example 2, Example 3 and Examples 4 and 5, when a fluidizing agent containing lignin sulfonate calcium salt and lignin sulfonate sodium salt is used, a small addition amount But you can see that you can achieve your goals.

  The self-flowing hydraulic composition of the present invention has a small temperature dependency, and therefore a cured product having a good finished surface can be obtained in a wide temperature range.

Claims (10)

  A hydraulic composition comprising a hydraulic component composed of alumina cement, Portland cement and gypsum and a fluidizing agent, wherein the fluidizing agent comprises a fluidizing agent comprising calcium lignin sulfonate and sodium lignin sulfonate. A hydraulic composition comprising a polycarboxylic acid-based fluidizing agent.   The water according to claim 1, wherein the fluidizing agent containing calcium lignin sulfonate and sodium lignin sulfonate is 0.01 to 5.0 parts by mass with respect to 100 parts by mass of the hydraulic component. Hard composition.   In 100 mass% of the fluidizing agent, the fluidizing agent containing calcium lignin sulfonate and sodium lignin sulfonate is 50 to 90 mass%, and the polycarboxylic acid-based fluidizing agent is 10 to 50 mass%. The hydraulic composition according to claim 1 or 2.   The water according to any one of claims 1 to 3, which is 20 to 80% by mass of alumina cement, 5 to 70% by mass of Portland cement and 5 to 45% by mass of gypsum in 100% by mass of the hydraulic component. Hard composition. The hydraulic composition includes fine aggregate,
Furthermore, including at least one component selected from inorganic components, setting retarders, resin powders, thickeners and antifoaming agents,
The hydraulic composition according to any one of claims 1 to 4, wherein the hydraulic mortar prepared by kneading the hydraulic composition and water has a flow value of 190 to 270 mm .   6. The hydraulic composition according to claim 5, wherein the setting retarder is a sodium salt of an organic acid and / or an inorganic acid.   The shore hardness of the surface of a cured body of a hydraulic mortar prepared by kneading a hydraulic composition and water is 1 or more after 4 hours from the construction of the hydraulic mortar. The hydraulic composition of any one of these.   The water-drawing time on the surface of a cured body of a hydraulic mortar prepared by kneading a hydraulic composition and water is 30 to 150 minutes after the construction of the hydraulic mortar. The hydraulic composition of any one of these.   A hydraulic mortar obtained by kneading the hydraulic composition according to any one of claims 1 to 8 and water.   The concrete floor structure which has the hardening body layer of the hydraulic mortar of Claim 9 in a surface layer.

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