JP6437384B2 - Self-leveling material, self-leveling material slurry and cured body - Google Patents

Description

  The present invention provides a self-leveling material used as a floor base material for the construction of a floor of a structure, a self-leveling material slurry obtained by kneading a self-leveling material and water, and obtained by curing the self-leveling material slurry. It relates to a cured product.

  It is considered that the self-leveling material needs to exhibit good compressive strength while having excellent fluidity and good surface properties.

Patent Document 1 discloses a hydraulic composition using high-brane gypsum that contains a predetermined amount of alumina cement, Portland cement, and gypsum, and that has a glaine specific surface area of 7500 cm ² / g or more.

JP 2006-265011 A

However, since the high-brane gypsum is difficult to handle, further improvement is required so that the strength can be improved even when a highly versatile gypsum having a specific surface area of 2000 to 6000 cm ² / g is used.

  Then, an object of this invention is to provide the self-leveling material which can form the hardening body which expresses favorable compressive strength, while having favorable surface property. Furthermore, it aims at providing the self-leveling material which can obtain the self-leveling material slurry excellent in fluidity | liquidity.

  As a result of intensive studies to achieve the above object, the present inventors have made a hydraulic component made of alumina cement, Portland cement and highly versatile gypsum, fine blast furnace slag powder, fine aggregate having a predetermined moisture content, By using a self-leveling material containing a fluidizing agent, a thickener and a setting modifier, a self-leveling material slurry having excellent fluidity, and a curing that exhibits good compressive strength while having good surface properties It was found that a body was obtained, and the present invention was completed.

That is, the present invention is a self-leveling material containing a hydraulic component, blast furnace slag fine powder, fine aggregate, fluidizing agent, thickener and setting modifier, and the hydraulic component is Portland cement, alumina cement and consists gypsum, the mixing ratio of the hydraulic component is Portland cement 15 to 55% by weight, alumina cement 15-55% by weight and 5 to 35% by weight gypsum, Blaine specific surface area of the gypsum be a 2000~6000cm ² / g The blast furnace slag fine powder content is 70 to 140 parts by mass with respect to 100 parts by mass of the hydraulic component, and the fine aggregate content is 160 to 260 parts by mass with respect to 100 parts by mass of the hydraulic component. There is provided a self-leveling material, which is a fine aggregate prepared in a range of 1.00 to 1.70% moisture content of the fine aggregate.

  According to the self-leveling material of the present invention, a self-leveling material slurry having excellent fluidity can be prepared. Moreover, the hardened | cured material which has favorable compressive strength can be formed, having favorable surface property. That is, the self-leveling material of the present invention and water are blended and kneaded to prepare (manufacture) a self-leveling material slurry, which is applied to the floor foundation surface of the structure and cured, thereby having good compressive strength. A cured product can be obtained.

  Preferred embodiments [(1) to (2)] of the self-leveling material of the present invention are shown below. In the present invention, it is more preferable to appropriately combine these aspects.

  (1) The self-leveling material of the present invention preferably has a fine aggregate coarse particle ratio of 0.60 to 1.40 and a water absorption of 3.00% or less. Thereby, better compressive strength can be obtained while having better fluidity and better surface properties.

  (2) In the self-leveling material of the present invention, the mass fraction remaining in each sieve of fine aggregate is 0.01 to 5.0% at a sieve opening of 0.425 mm, and 30.0 at a sieve opening of 0.212 mm. It is preferable that it is 60.0 to 99.0% at a sieve opening of 0.15 mm. Thereby, better compressive strength can be obtained while having better fluidity and better surface properties.

  In the present invention, a self-leveling material slurry obtained by kneading the above-mentioned self-leveling material and water is provided. Since the self-leveling material slurry of the present invention contains the self-leveling material having the above characteristics, it has excellent fluidity.

  In this invention, the hardening body obtained by hardening | curing the above-mentioned self-leveling material slurry is provided. Since the cured body of the present invention contains a self-leveling material and a self-leveling material slurry having the above characteristics, it has good surface properties and good strength characteristics.

  According to the present invention, a self-leveling material slurry capable of forming a cured body having good surface properties and good compressive strength, and having excellent fluidity, and such a self-leveling material slurry can be prepared. A self-leveling material 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.

<Self-leveling material>
A preferred embodiment of the self-leveling material of the present invention will be described below. The self-leveling material of this embodiment is a self-leveling material used as a floor base material for the construction of a floor surface of a structure. The self-leveling material of the present embodiment is a self-leveling material containing a hydraulic component, blast furnace slag fine powder, fine aggregate, fluidizing agent, thickener and setting modifier, and the hydraulic component includes Portland cement, It consists of three components: alumina cement and gypsum.

  The self-leveling material of the present embodiment has excellent fluidity and fast curing, and in order to obtain a cured body with little volume change during curing, the blending ratio of the three components in 100% by mass of the hydraulic component is Portland cement. 15 to 55% by mass of alumina, 15 to 55% by mass of alumina cement, and 5 to 35% by mass of gypsum.

  The blending ratio of the hydraulic component is preferably 20 to 50% by mass of Portland cement, 20 to 50% by mass of alumina cement and 10 to 30% by mass of gypsum, more preferably 25 to 48% by mass of Portland cement and alumina cement. 25 to 45% by mass and gypsum 15 to 29% by mass, more preferably Portland cement 30 to 46% by mass, alumina cement 28 to 42% by mass and gypsum 20 to 28% by mass, particularly preferably Portland cement 35 to 35% by mass. 45% by mass, alumina cement 30-35% by mass and gypsum 23-27% by mass.

  When the blending ratio of the hydraulic component is within the above preferable range, it is more reliable to obtain a cured body having low material cost, better fluidity and quick curing, and less volume change during curing. Become.

  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.

The Blaine specific surface area of Portland cement becomes like this. Preferably it is 3000-6000 cm < ² > / g, More preferably, it is 4000-5000 cm < ² > / g, More preferably, it is 4200-4800 cm < ² > / g. The Blaine specific surface area of Portland cement is calculated | required according to JISR5201: 1997.

  When the specific surface area of Portland cement is within the above preferred range, it is excellent in the balance of strength development and setting time when three components are used.

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 2000-6000 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 fluidity and strength development, anhydrous gypsum is preferably used.

The glaine specific surface area of gypsum is 2000 to 6000 cm ² / g. When the brane specific surface area of gypsum is in the above range, the handling becomes easy and the versatility is high, so that it can be obtained at a low cost. The brane specific surface area of gypsum is determined according to JIS R 5201: 1997.

Further, the specific surface area of gypsum is preferably 2250 to 5800 cm ² / g, more preferably 2500 to 5600 cm ² / g, still more preferably 2750 to 5400 cm ² / g, and particularly preferably 3000 to 5000 cm. ² / g.

  When the glaine specific surface area of gypsum is within the above-mentioned preferable range, the handling becomes easier and the versatility is high, and therefore, it can be obtained at a lower cost.

  When the hydraulic component is composed of three components of Portland cement, alumina cement, and gypsum, a cured product having excellent fluidity and rapid curing and less volume change during curing can be obtained.

The blast furnace slag fine powder is preferably a blast furnace slag fine powder defined in JIS A 6206 “Blast furnace slag fine powder for concrete”. Also, the Blaine specific surface area of the ground granulated blast furnace slag is preferably 3000 cm ² / g or more, more preferably 3000~8000cm ² / g, more preferably from 3500~6000cm ² / g, particularly preferably 4000 ˜5000 cm ² / g. The Blaine specific surface area of blast furnace slag fine powder is calculated | required according to JISR5201: 1997.

  When the Blaine specific surface area of the blast furnace slag fine powder is within the above preferred range, excellent fluidity, dimensional stability and strength development can be obtained.

  The content of the blast furnace slag fine powder is 70 to 140 parts by mass, preferably 75 to 135 parts by mass, more preferably 80 to 133 parts by mass, and still more preferably 100 parts by mass of the hydraulic component. It is 85-130 mass parts, Most preferably, it is 90-125 mass parts.

  When the content of the blast furnace slag fine powder is in the above range, excellent fluidity, dimensional stability and strength development can be obtained.

  The fine aggregate preferably has a maximum particle diameter of 0.85 mm or less, and the coarse aggregate having a particle diameter of more than 0.6 mm is contained in less than 5 mass% 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 determined according to the aggregate screening test method defined in JIS A 1102: 2014. Further, in this specification, “coarse fraction having a particle diameter of greater than 0.6 mm” means a mass fraction of fine aggregates that remain on the sieve when a sieve having a sieve mesh of 0.6 mm is used ( %).

  When the fine aggregate contains 5% by mass or more of coarse particles having a particle diameter of more than 0.6 mm, the fluidity of the self-leveling material tends to decrease. The lower limit of the coarse particles is not particularly limited, and may be 0% by mass. In order to obtain excellent fluidity, the coarse particle content in the fine aggregate is more preferably 0 to 3% by mass, still more preferably 0 to 0.5% by mass, and particularly preferably 0.01 to 0%. .2% by mass.

  Further, the mass fraction remaining in each sieve of the fine aggregate is preferably 0.01 to 5.0% at a sieve opening of 0.425 mm, 30.0 to 90.0% at a sieve opening of 0.212 mm, It is 60.0 to 99.0% when the sieve opening is 0.15 mm, more preferably 0.02 to 4.0% when the sieve opening is 0.425 mm, and 35.0 to 85 when the sieve opening is 0.212 mm. 0.05, sieve opening 0.15 mm, 65.0 to 98.0%, more preferably sieve opening 0.425 mm, 0.04 to 3.0%, sieve opening 0.212 mm, 35 0.087.5%, sieve opening 0.15 mm, 65.0-97.0%, particularly preferably sieve opening 0.425 mm, 0.1-1.5%, sieve opening 0 .40.0-85.0% at 212mm, sieve opening It is 70.0 to 95.0% at 0.15mm.

  When the mass fraction remaining on each sieve of the fine aggregate is in the above range, better compressive strength can be obtained while having better fluidity and better surface properties.

  The coarse particle ratio of the fine aggregate is 0.60 to 1.40, and the water absorption is preferably 3.00% or less. Thereby, more excellent fluidity can be obtained.

  In the present specification, the “coarse grain ratio” refers to the coarse grain ratio of the aggregate as defined in JIS A 1102: 2014. 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.

  The coarse particle ratio of the fine aggregate is more preferably 0.68 to 1.35, further preferably 0.72 to 1.28, and particularly preferably 0.74 to 1.25. The water absorption rate of the fine bone agent is more preferably 2.95% or less, still more preferably 2.90% or less, and particularly preferably 2.80% or less.

  The content of the fine aggregate is 160 to 260 parts by mass with respect to 100 parts by mass of the hydraulic component, preferably 170 to 250 parts by mass, more preferably 180 to 240 parts by mass, and still more preferably 185. It is -235 mass parts, Most preferably, it is 190-230 mass parts.

  When the content of the fine aggregate is within the above range, excellent fluidity, good surface properties, and good compressive strength can be obtained.

  The fine aggregate used for the self-leveling material of the present embodiment is a fine aggregate prepared to a predetermined moisture content, and the moisture content of the fine aggregate is 1.00 to 1.70%, preferably 1.05 to 1.65%, more preferably 1.10 to 1.60%, still more preferably 1.15 to 1.55%, and particularly preferably 1.20 to 1.50%. is there.

  By using a fine aggregate whose water content is adjusted within the above range, a good compressive strength can be obtained without using a high-brane gypsum while having excellent fluidity and good surface properties.

  In the present specification, the “water content” is a ratio (unit:%) obtained by dividing the mass (decreasing mass) that decreases by heating and drying the fine aggregate by the mass of the fine aggregate before heating and drying. For example, when the reduced mass obtained by heating and drying 500 g of fine aggregate is 5.0 g, 5.0 (g) ÷ 500 (g) × 100 = 1.0%.

  In addition, as a method for producing a fine aggregate adjusted to a predetermined moisture content, conditions for reaching a constant weight by heating and drying the fine aggregate are determined in advance, and the fine aggregate is heated and dried under a condition for reaching the constant weight. Later, there is a method in which a precalculated amount of water is added to the fine aggregate to achieve a desired moisture content and mixed. In addition, in order to confirm that the desired moisture content is obtained, a part of the fine aggregate mixed with the predetermined amount of water is collected, the mass thereof is measured, and after heating and drying, the mass is measured again. What is necessary is just to calculate "moisture content".

  The self-leveling material of this embodiment is used with a small amount of mixing water in order to obtain a high-strength cured body while suppressing material separation. Accordingly, the self-leveling material of the present invention contains a fluidizing agent having a water reducing effect in order to ensure high fluidity even if the water / binder component ratio is small.

  As the fluidizing agent, commercially available fluidizing agents such as formaldehyde condensate of melamine sulfonic acid, casein, casein calcium, polycarboxylic acid, polyether and polyether polycarboxylic acid, which have a water reducing effect, are included. Can be used regardless of type.

  The content of the fluidizing agent can be appropriately contained in a range that does not impair the properties, depending on the binder component to be used, and is preferably 0.005 to 1.0 mass with respect to 100 parts by mass of the hydraulic component. Part, more preferably 0.01 to 0.5 part by weight, still more preferably 0.025 to 0.4 part by weight, and particularly preferably 0.1 to 0.3 part by weight.

  If the content of the fluidizing agent is too small, it is difficult to obtain a suitable effect (excellent fluidity and good compressive strength), and even if the content is too large, it is difficult to obtain an effect commensurate with the added amount, In addition to being uneconomical, in some cases, the viscosity is increased and the amount of kneading water for obtaining the required fluidity may increase.

  The self-leveling material of this embodiment contains a thickener in order to suppress material separation and obtain good surface properties. The thickener is preferably a methylcellulose thickener. The methylcellulose thickener can be used regardless of its type, and it is particularly preferable to use a hydroxyethylmethylcellulose thickener or a hydroxypropylmethylcellulose thickener. When the thickener is a methylcellulose-based thickener, it has a favorable effect on suppressing the separation of hydraulic components and fine aggregates, suppressing the generation of bubbles, and improving the surface properties of the cured body, and curing the hydraulic composition. It is preferable in order to improve the properties of the product.

  The viscosity of the thickener is preferably 400 to 100,000 mPa · s, more preferably 1000 to 80000 mPa · s, still more preferably 2000 to 50000 mPa · s, and particularly preferably 3000 to 40000 mPa · s.

  In the present specification, “viscosity” refers to a viscosity obtained by measuring a 1% by mass aqueous solution of a thickener at 20 ° C. using a B-type viscometer. A combination determined by a viscometer to be used is appropriately selected as the type and rotation speed of the rotor when measuring the viscosity.

  The content of the thickener is preferably 0.02 to 0.80 parts by mass, more preferably 0.04 to 0.70 parts by mass, further preferably 100 parts by mass of the hydraulic component. It is 0.06-0.60 mass part, Most preferably, it is 0.10-0.40 mass part.

  When the content of the thickener is in the above range, the balance between material separation resistance and fluidity is more excellent, and better surface properties can be obtained.

  The self-leveling material of the present embodiment contains a setting adjuster in order to adjust the fluidity retention time and fast curing. The setting modifier includes a setting accelerator that accelerates the hydration reaction of the binder component and a setting retarder that delays the hydration reaction of the binder component. Depending on the combination of the binder component used, these components and The content is 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 content of the setting retarder is preferably 0.10 to 2.0 parts by weight, more preferably 0.20 to 1.8 parts by weight, and still more preferably 100 parts by weight of the hydraulic component. 0.30 to 1.5 parts by mass, particularly preferably 0.40 to 1.2 parts by mass.

  When the content of the setting retarder is in the above-mentioned preferable range, it has more excellent fluidity and a suitable fluidity retention time can be obtained.

  As the setting accelerator, a known component for promoting setting can be used. For example, lithium salt, aluminum sulfate, and calcium chloride having a setting acceleration effect can be preferably used, and several of 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.

  As the setting accelerator, those having a particle size that does not interfere with the properties of the self-leveling material are preferably used, 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, still more preferably 20 μm or less, and particularly preferably 10 μm or less. When the particle diameter of the lithium salt is larger than the above range, the solubility of the lithium salt becomes small, which is not preferable. In particular, in the pigment addition system, it is noticeable as a large number of fine spots, and the appearance may be impaired.

  The content of the setting accelerator is preferably 0.01 to 2.5 parts by mass, more preferably 0.02 to 1.5 parts by mass, still more preferably 100 parts by mass of the hydraulic component. It is 0.05-1.0 mass part, Most preferably, it is 0.1-0.5 mass part.

  When the content of the setting accelerator is within the above-described preferable range, it has excellent fluidity, and after securing a good fluidity retention time, it is possible to develop a suitable fast-curing property.

  As a method for producing the self-leveling material of the present embodiment, a fine aggregate, a hydraulic component, a blast furnace slag fine powder, a fluidizing agent, a thickening agent, and a coagulation adjusting agent prepared at a predetermined moisture content are mixed in a mixer. The content may be charged and mixed for a predetermined time. Although there is no restriction | limiting in particular about an injection | throwing-in order, after adding the fine aggregate with a large particle diameter initially, it is easier to mix uniformly in a short time if the remaining raw material is thrown in.

  In addition to the above essential components, an antifoaming agent, a shrinkage reducing agent, a resin powder and the like can be added to the self-leveling material of the present invention as necessary. Examples of the antifoaming agent include known substances such as synthetic substances such as silicone-based, alcohol-based and / or polyether-based substances and / or plant-derived natural substances. Among these, polyether antifoaming agents are preferable from the viewpoints of price and availability. By using an antifoaming agent, it can be expected that the defoaming effect of the self-leveling material is improved.

<Self-leveling material slurry>
The self-leveling material slurry of the present invention can be prepared (manufactured) by mixing and stirring the above-mentioned self-leveling material with a predetermined amount of water. A preferred embodiment of the self-leveling material slurry of the present invention will be described below. Since the self-leveling material slurry of the present embodiment has excellent fluidity, a horizontal and flat floor surface can be easily formed by applying it to the floor surface of the structure. When preparing the self-leveling material slurry, the fluidity of the self-leveling material slurry can be adjusted by adjusting the blending amount of water.

  In the self-leveling material slurry, the mass ratio (W / S) of water (W) to the self-leveling material (S) is preferably 0.21 to 0.29, more preferably 0.22 to 0.28. Can be blended and kneaded so as to be in the range of 0.23 to 0.27, particularly preferably 0.24 to 0.26.

  There is a flow value as an index of fluidity of the self-leveling material slurry. The flow value is a value (unit: mm) measured in accordance with the Architectural Institute of Japan JASS 15M-103 “Quality Standard for Self-Leveling Material”.

  The flow value of the self-leveling material slurry is preferably 190 to 260 mm, more preferably 195 to 250 mm, still more preferably 200 to 245 mm, and particularly preferably 205 to 240 mm. When the flow value is in the above-described range, the fluidity is more excellent.

  Moreover, there exists SL value as a parameter | index of the fluidity | liquidity of a self-leveling material slurry. The SL value can be measured using the SL measuring device shown in FIG.

  The SL measuring device 10 is made of a synthetic resin and has a bowl shape with an internal dimension of 30 mm width × 30 mm height × length 750 mm, and only one end is an open end. The SL measuring device 10 includes a filling portion 11 for filling the self-leveling material slurry on the closed end side, and a synthetic resin adjacent to the filling portion 11 for damming the filled self-leveling material slurry. The filling section 11 has a capacity of 30 mm in width, 30 mm in height, and 150 mm in length.

  FIG. 2 is a cross-sectional view schematically showing a method for evaluating the SL value of a self-leveling material slurry using the above-described SL measuring device. First, as shown in FIG. 2A, the self-leveling material slurry immediately after kneading is poured so as to fill the filling portion 11. By pulling up the weir plate 12 immediately after pouring, the poured self-leveling material slurry flows toward the opening end side of the SL measuring instrument 10 as shown in FIG.

  The distance from the mark 13 to the end point 14 at which the flow of the self-leveling material slurry is stopped is defined as the SL value (mm). By measuring this SL value, the fluidity of the self-leveling material slurry can be evaluated.

  The SL value of the self-leveling material slurry is preferably 250 to 600 mm, more preferably 300 to 580 mm, still more preferably 350 to 560 mm, and particularly preferably 400 to 550 mm. When the SL value is in the above range, the fluidity is more excellent.

<Hardened body>
The cured body of the present invention can be obtained by curing the above-mentioned self-leveling material slurry. A preferred embodiment of the cured body of the present invention will be described below. The cured body of the present embodiment can be suitably used as a floor base material for schools, condominiums, convenience stores, hospitals, verandas and the like because it has a good compressive strength while having a good surface state. The compressive strength is a value (unit: N / mm ² ) measured in accordance with the Japan Architectural Institute JASS 15M-103 “Quality Standard for Self-Leveling Material”.

  The surface of the cured body of the present embodiment is required to have horizontality and smoothness (flatness). In particular, surface pulverization (a powdery thin layer is formed on the surface) and surface irregularities (fine irregularities on the surface) that cause a decrease in adhesiveness when constructing a stretch or painted floor on the cured body surface Is not generated). As the surface state, it is preferable that the surface of the cured body is visually or touched with a finger so that the powder does not adhere to the finger or does not feel unevenness on the finger.

Compressive strength at the age of 28 days of the cured product of the present embodiment is preferably 23N / mm ² or more, more preferably 25 N / mm ² or more, more preferably 27N / mm ² or more, particularly preferably Is 28 N / mm ² or more. When the compressive strength is within the above-mentioned preferable range, the cured body has a good compressive strength as a floor base material.

  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) Hydraulic component Portland cement [PC] (Hayato Portland cement, manufactured by Ube Mitsubishi Cement Co., Ltd., Blaine specific surface area 4480 cm ² / g)
Alumina cement [AC] (main component: monocalcium aluminate, manufactured by Kerneos, Blaine specific surface area 3080 cm ² / g)
Gypsum [GG] (natural anhydrous gypsum, Blaine specific surface area 4740 cm ² / g)

  The said material was mix | blended in the ratio shown in Table 1, and the hydraulic component was prepared.

(2) Blast furnace slag fine powder (Blaine specific surface area 4300 cm ² / g)
(3) Fine aggregate Silica sand (coarse fraction having a particle diameter of more than 0.6 mm = 0.1% by mass, water absorption rate = 2.16%)

  Table 2 shows the particle size constitution (mass fraction remaining in each sieve, mass fraction remaining between each successive sieve) and coarse grain ratio of the fine aggregate.

  About the moisture content measurement of fine aggregate, after collecting about 100g of fine aggregate, measuring the mass before heating (mass before heating), heating for 8 minutes using a 500W microwave oven, and mass after heating (Mass after heating) is measured. After obtaining a value (decreasing mass) obtained by subtracting the mass after heating from the mass before heating, the value obtained by dividing the decreasing mass by the mass before heating was regarded as a percentage.

  Regarding the preparation of the moisture content of the fine aggregate, the fine aggregate of 20 kg was dried for 24 hours with a dryer at 105 ° C. (equivalent to the condition where about 100 g of the fine aggregate was heated for 8 minutes using a 500 W microwave oven). Then, a precalculated amount of water was added to the dried fine aggregate to achieve a predetermined water content, and the mixture was stirred for 5 minutes with a scoop and mixed. Then, after sealing with a polyethylene bag having a thickness of 0.2 mm and allowing to stand for 24 hours, the mixture was further mixed for 5 minutes to prepare (manufacture) a fine aggregate having a predetermined moisture content. Moreover, about the fine aggregate which adjusted the moisture content, the moisture content was calculated | required with the above-mentioned moisture content measuring method.

  Table 3 shows the fine aggregates whose water content was adjusted using the fine aggregates.

(4) Fluidizer Polycarboxylic acid based fluidizer (5) Thickener Hydroxypropyl methylcellulose thickener (viscosity of 1 mass% aqueous solution at 20 ° C. = 18400 mPa · s)

  The viscosity of the thickener was measured using a B-type viscometer (Digital Viscometer manufactured by Tokyo Keiki Co., Ltd .: DVL-B), with respect to an aqueous solution (20 ° C.) containing 1% by weight of the thickener. 4. Measurement was performed under the condition of a rotor rotational speed of 12 rpm.

(6) Setting controller Setting retarder: Mixture of sodium tartrate and sodium bicarbonate Setting accelerator: Lithium carbonate (particle size 3.5 ± 1 μm)

[Preparation of self-leveling material]
The above materials (total amount: 15 kg) were mixed at the blending ratio shown in Table 4. As a mixing method, it was mixed for 7 minutes using an Eirich mixer. 390 g of water was added to 1.5 kg of the mixed self-leveling material and kneaded for 3 minutes using a chemistor to obtain a self-leveling material slurry. The self-leveling material was prepared in a thermostatic chamber at a temperature of 20 ° C. In addition, content of a blast furnace slag fine powder, a fine aggregate, a fluidizing agent, a thickener, and a setting regulator is shown by a mass part when a hydraulic component is 100 mass parts.

  The flow value, the SL value, the surface property of the cured body, and the compressive strength of the cured body were measured as shown below in each formulation shown in Table 4 using the fine aggregates A to E. These results are shown in Table 5.

[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.

[SL value]
The SL value was measured using the SL measuring device shown in FIG. The measurement was performed in a constant temperature room at a temperature of 20 ° C.

[Surface properties]
The self-leveling material slurry immediately after kneading was poured into a synthetic resin container having an internal dimension of width 130 × length 190 × height 17 mm so that the thickness was 15 mm, and after 24 hours had passed in a temperature-controlled room at 20 ° C., The properties (surface pulverization and surface irregularities) of the cured body surface were evaluated visually and by palpation.

[Compressive strength]
Compressive strength was measured in accordance with JASS 15M-103 “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., and the material age was 28 days.

  As shown in Table 5, the flow value of the self-leveling material slurry of the example showed an excellent fluidity of 212 mm, and the SL value showed an excellent fluidity of 430 mm. The surface properties after 24 hours were good with no powdering or unevenness.

Furthermore, even when Example 1 uses a highly versatile gypsum in the range of a Blaine specific surface area of 2000 to 6000 cm ² / g, the compressive strength of the material 28 days old is due to the moisture content of the fine aggregate being in a specific range. Was 29.2 N / mm ² , which was higher and better than Comparative Examples 1 to 3.

  From the above, the self-leveling material of this embodiment can form a cured body having good surface properties and good compressive strength, and has a good fluidity, and such a self-leveling material slurry. It was confirmed that it was possible to prepare

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

Claims (5)

A self-leveling material containing a hydraulic component, blast furnace slag fine powder, fine aggregate, fluidizer, thickener and setting modifier,
The hydraulic component is made of Portland cement, alumina cement and gypsum,
The blending ratio of the hydraulic component is 15 to 55% by mass of Portland cement, 15 to 55% by mass of alumina cement and 5 to 35% by mass of gypsum,
The gypsum has a brain specific surface area of 2000 to 6000 cm ² / g,
The content of the blast furnace slag fine powder is 70 to 140 parts by mass with respect to 100 parts by mass of the hydraulic component,
The content of the fine aggregate is 160 to 260 parts by mass with respect to 100 parts by mass of the hydraulic component,
The fine aggregate is prepared in the range of 1.00 to 1.70% water content of the fine aggregate,
Self-leveling material. The coarse aggregate ratio of the fine aggregate is 0.60 to 1.40, and the water absorption is 3.00% or less.
The self-leveling material according to claim 1. The mass fraction remaining on each sieve of the fine aggregate is 0.01 to 5.0% when the sieve opening is 0.425 mm, 30.0 to 90.0% when the sieve opening is 0.212 mm, and the sieve opening is 0. .15mm and 60.0-99.0%,
The self-leveling material according to claim 1 or 2.   A self-leveling material slurry obtained by kneading the self-leveling material according to any one of claims 1 to 3 and water.   A cured product obtained by curing the self-leveling material slurry according to claim 4.

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