JP6437385B2 - 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 have good storage stability while having excellent fluidity and excellent quick hardening and quick drying properties.

  Patent Document 1 discloses a self-flowing hydraulic composition containing a hydraulic component, a fine aggregate, and a fluidizing agent, and the fine aggregate is 600 μm or more in the fine aggregate (100% by mass). A self-flowing hydraulic composition containing less than 5% by weight of coarse particles having a particle size of 5% and a fine aggregate water absorption of 1.6% or less is disclosed.

JP 2010-229209 A

  However, in order to have better storage stability while having excellent fluidity and excellent quick hardening and quick drying properties, further improvement is necessary.

  Therefore, the present invention can obtain a self-leveling material slurry excellent in fluidity, can form a cured product having excellent fast-curing fast-drying properties, and has better storage stability. The object is to provide a self-leveling material.

  As a result of intensive studies to achieve the above object, the present inventors have found that hydraulic components comprising alumina cement, Portland cement and gypsum, fine powder of blast furnace slag, fine aggregate having a predetermined moisture content, fluidizing agent, By using a self-leveling material containing a thickener and a setting modifier, a self-leveling material slurry having excellent fluidity, a cured product having excellent quick-hardening and quick-drying properties, and a self-leveling material having good storage stability Has been found, and the present invention has been 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. 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, and the content of the blast furnace slag fine powder is the hydraulic component. 70 to 140 parts by mass with respect to 100 parts by mass, the content of fine aggregate is 160 to 260 parts by mass with respect to 100 parts by mass of the hydraulic component, and the moisture content of the fine aggregate is 0.35. Provided is a self-leveling material that is a fine aggregate prepared in a range of less than ˜1.00%.

  According to the self-leveling material of the present invention, a self-leveling material slurry having good storage stability and excellent fluidity can be prepared. Moreover, the hardening body which has the outstanding quick hardening quick-drying property can be formed. 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 surface of the structure and cured to provide excellent fast-hardening and quick-drying properties. A cured product having 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, the more excellent fluidity | liquidity and the more excellent quick hardening quick drying property can be obtained.

  (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, the more excellent fluidity | liquidity and the more excellent quick hardening quick drying property can be obtained.

  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 hardening body of this invention contains the self-leveling material and self-leveling material slurry which have the said characteristic, it has the outstanding quick hardening quick drying property.

  According to the present invention, a self-leveling material slurry that can form a cured body having excellent fast-curing and quick-drying properties and that has excellent fluidity, and good storage capable of preparing such a self-leveling material slurry. A self-leveling material having stability can be provided.

<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 / fast drying properties, and in order to obtain a cured body with little volume change during curing, the blending ratio of the three components in 100 mass% of the hydraulic component is Portland cement 15 to 55% by mass, alumina cement 15 to 55% by mass and gypsum 5 to 35% by mass.

The blending ratio of hydraulic component is
Preferably, Portland cement is 20 to 50% by mass, Alumina cement is 20 to 50% by mass, and Gypsum is 10 to 30% by mass. More preferably, Portland cement is 25 to 48% by mass, Alumina cement is 25 to 45% by mass, and Gypsum is 15 to 29%. %, More preferably 30 to 46% by weight of Portland cement, 28 to 42% by weight of alumina cement and 20 to 28% by weight of gypsum, particularly preferably 35 to 45% by weight of Portland cement and 30 to 35% of alumina cement. % 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 preferably 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.

Moreover, the brane specific surface area of gypsum is 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, it is possible to obtain a cured product that has excellent fluidity, quick curing, and quick drying, and has little volume change during curing.

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”. Moreover, the Blaine specific surface area of the blast furnace slag fine powder is
Preferably at 3000 cm ² / g or more, more preferably 3000~8000cm ² / g, more preferably from 3500~6000cm ² / g, particularly preferably 4000~5000cm 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% 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%. In order to obtain excellent fluidity, the coarse particle content in the fine aggregate is more preferably 0 to 3%, further preferably 0 to 0.5%, and particularly preferably 0.01 to 0.2%. %.

  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 within the above range, it is possible to obtain more excellent fluidity and better quick hardening and quick drying.

  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 and excellent quick hardening and quick drying 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 preferably less than 0.35 to 1.00%, Is 0.37 to 0.98%, more preferably 0.40 to 0.95%, still more preferably 0.45 to 0.92%, and particularly preferably 0.50 to 0.90. %. By using a fine aggregate whose water content is adjusted in the above range, it is possible to obtain good storage stability while having excellent fluidity and excellent quick hardening and quick drying.

  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-mentioned preferable range, it has excellent fluidity, and after securing a good fluidity retention time, it is possible to express suitable quick hardening and quick drying.

  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.

  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. As for the scattering of the powder during the production of the self-leveling material, the less it is, the better. If it is too much, the expected performance may not be exhibited. The scattering index can be expressed by a powder scattering state when a predetermined amount of the self-leveling material after production is taken out and put into another container, and is confirmed visually. In addition, since the self-leveling material of this embodiment has good storage stability, the self-leveling material slurry is prepared at any timing immediately after the self-leveling material is manufactured or after being stored for a certain time after the self-leveling material is manufactured. However, it has excellent fluidity regardless of the difference in storage time, and the cured product has excellent fast-hardening and quick-drying properties.

<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 this embodiment has excellent fluidity regardless of the storage time of the self-leveling material, it can be easily applied to a floor surface of a structure to form a horizontal and flat floor surface. Can be formed. 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”. In addition, the storage stability index can be represented by a flow change value, which is a self-leveling material slurry prepared by mixing with a predetermined amount of water using a self-leveling material stored for 24 hours after manufacture. This is a value obtained by dividing the flow value by the flow value of a self-leveling material slurry prepared by mixing with a predetermined amount of water using a self-leveling material stored for 25 minutes after production.

  The flow value of the self-leveling material slurry prepared by mixing with a predetermined amount of water using a self-leveling material stored for 25 minutes after production is preferably 190 to 260 mm, more preferably 195 to 250 mm, and still more preferably Is 200 to 245 mm, particularly preferably 205 to 240 mm. When the flow value is in the above-described range, the fluidity is more excellent.

  The flow change value of the self-leveling material slurry is preferably 0.85 to 1.15, more preferably 0.90 to 1.10, still more preferably 0.95 to 1.08, and particularly preferably. Is 0.98 to 1.05. By having the flow change value in the above-mentioned range, it has good storage stability.

<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 has excellent quick-hardening and quick-drying regardless of the storage time of the self-leveling material. It can be suitably used as a material. The quick-drying index can be expressed by a watering time. The watering time is the time (minutes) required after the self-leveling material slurry is prepared (manufactured) until the moisture on the surface of the self-leveling material slurry disappears. The fast hardening index can be expressed by Shore hardness, and the Shore hardness measured the surface of the cured body with a Shore hardness meter when 2 hours passed after preparation (manufacture) of the self-leveling material slurry. Value.

  In addition, the storage stability index can be expressed by a watering time change value and a shore hardness change value, and the watering time change value is obtained by mixing with a predetermined amount of water using a self-leveling material stored for 24 hours after manufacture. It is a value obtained by dividing the watering time of the prepared self-leveling material slurry by the watering time of the self-leveling material slurry prepared by mixing with a predetermined amount of water using a self-leveling material stored for 25 minutes after production, and the Shore hardness change The value is the level of shore hardness of the self-leveling material slurry prepared by mixing with a predetermined amount of water using a self-leveling material stored for 24 hours after manufacture, and the self-leveling material stored for 25 minutes after manufacture. It is a value obtained by dividing the self-leveling material slurry prepared by mixing with a predetermined amount of water by the Shore hardness after 2 hours of age.

  The watering time of the self-leveling material slurry surface (cured product) prepared using the self-leveling material stored for 25 minutes after production is preferably 30 to 120 minutes, more preferably 40 to 110 minutes, and still more preferably. It is 45 to 100 minutes, and particularly preferably 50 to 90 minutes. When the watering time is in the above preferred range, the cured product has excellent quick drying properties.

  The watering time change value of the self-leveling material slurry surface (cured body) is preferably 0.75 to 2.00, more preferably 0.85 to 1.90, and still more preferably 0.90 to 1. 80, particularly preferably 0.95 to 1.50. The self-leveling material has good storage stability because the watering time change value is in the above preferred range.

  The shore hardness at the age of 2 hours of the self-leveling material slurry surface (cured product) prepared using the self-leveling material stored for 25 minutes after production is preferably 10 or more, more preferably 20 or more, Preferably it is 30 or more, Most preferably, it is 35 or more. When the Shore hardness is in the above-mentioned preferable range, the cured body has excellent fast curing.

  The Shore hardness change value of the self-leveling material slurry (cured body) at an age of 2 hours is preferably 0.2 to 1.20, more preferably 0.4 to 1.15, and still more preferably 0. .6 to 1.10, particularly preferably 0.8 to 1.05. When the Shore hardness change value is in the above preferable range, the self-leveling material has good storage stability.

  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%, water absorption rate = 2.61%)

  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 (production)]
The self-leveling material was prepared in a temperature-controlled room at a temperature of 20 ° C., and the above materials (total amount: 15 kg) were mixed at a blending ratio shown in Table 4. In the mixing method, the fine aggregate, hydraulic component, and blast furnace slag fine powder are charged in the order of the Eirich mixer container, and then the premixed fluidizing agent, thickener and setting modifier are added for 7 minutes. Mixed. The prepared self-leveling material was sealed in polyethylene having a thickness of 0.2 mm, half of which was stored for 25 minutes, and the remaining half was stored for 24 hours. In addition, content of a blast furnace slag fine powder, a fine aggregate, a fluidizing agent, a thickener, and a setting regulator is represented by a mass part when a hydraulic component is 100 mass parts.

  The scattering property of the powder at the time of manufacture of the self-leveling material which mix | blended the fine aggregates AF shown in Table 4 was measured. The scattering property during the production of the self-leveling material was evaluated by visually confirming the amount of powder scattered when 1.5 kg of the self-leveling material stored for 25 minutes after the production was put into a 2 L plastic beaker. The powder scattered in the air covers the entire upper part of the beaker, the inside of the beaker becomes invisible, and the state in which the scattering from the upper part of the beaker can be visually confirmed is “X”, the powder scattered in the air The state where the upper part in the beaker was only partially covered by the above and scattering to the outside could not be confirmed visually was indicated as “◯”. These results are shown in Table 5.

  As shown in Table 5, in Comparative Example 1 using fine aggregate A, the powder was scattered to the outside of the beaker as compared with the composition using fine aggregates BF.

[Preparation of self-leveling material slurry (production)]
390 g of water was added to 1.5 kg of the self-leveling material in each storage condition using the fine aggregates A to F shown in Table 4, and kneaded for 3 minutes using a chemistor to obtain a self-leveling material slurry.

  The flow value, flow change value, watering time, watering time change value, Shore hardness and Shore hardness change value of each obtained self-leveling material slurry were obtained by the following methods. These values are shown in Table 6.

[Flow value]
The flow value was measured in a thermostatic chamber at a temperature of 20 ° C. in accordance with JASS 15M-103 “Architectural Institute of Japan: Quality standards for self-leveling materials”. Table 6 shows the flow values of the self-leveling material slurry prepared by mixing with a predetermined amount of water using the self-leveling material stored for 25 minutes after the production.

[Flow change value]
The flow change value is a predetermined amount using the self-leveling material stored for 25 minutes after the production of the self-leveling material slurry prepared by mixing with a predetermined amount of water using the self-leveling material stored for 24 hours after the production. It was obtained by dividing by the flow value of the self-leveling material slurry prepared by mixing with water. The results are shown in Table 6.

[Watering time]
Immediately after preparation of the self-leveling material slurry, the watering time is poured into a synthetic resin container having an inner dimension of width 130 × length 190 × height 17 mm so that the thickness becomes 15 mm. The time until the surface water of the slurry surface (cured body) disappeared (light reflection was lost and clouded) was measured. Table 6 shows the watering time of the surface of the self-leveling material slurry (cured body) prepared by mixing with a predetermined amount of water using the self-leveling material stored for 25 minutes after the production.

[Change in watering time]
The watering time change value is the self-leveling of the self-leveling material slurry surface (cured body) prepared by mixing with a predetermined amount of water using a self-leveling material stored for 24 hours after production, and stored for 25 minutes after production. It was determined by dividing the surface of the self-leveling material slurry (cured body) prepared by mixing with a predetermined amount of water using the material by the watering time. The results are shown in Table 6.

[Shore hardness]
The shore hardness was set immediately after preparation of the self-leveling material slurry, and after 2 hours had passed since the inner dimensions were poured into a synthetic resin container having a width of 130 × length of 190 × height of 17 mm so as to have a thickness of 15 mm. The surface hardness (Shore hardness) was measured using a spring type hardness tester type D type (manufactured by Ueshima Seisakusho Co., Ltd.), and the surface hardness of any four locations was measured. The average value of the readings was used. Table 6 shows the Shore hardness after 2 hours of age of a self-leveling material slurry prepared by mixing with a predetermined amount of water using a self-leveling material stored for 25 minutes after production.

[Shore hardness change value]
The Shore hardness change value is the self hardness of the self-leveling material slurry prepared by mixing with a predetermined amount of water using a self-leveling material stored for 24 hours after manufacture and the shore hardness after 2 hours of age stored for 25 minutes after manufacture. A value obtained by dividing the self-leveling material slurry prepared by mixing with a predetermined amount of water using a leveling material by the Shore hardness after 2 hours of age. The results are shown in Table 6.

  As shown in Table 6, in Examples 1 to 3, the flow value shows excellent fluidity of 213 to 219 mm under the condition of storing for 25 minutes after production, and the flow change value also in the condition of storing for 24 hours after production. Exhibited a good storage stability at 1.00 to 1.03. Also, under the conditions of storage for 25 minutes after production, the watering time is 54-60 minutes, showing an excellent quick-drying property, and the Shore hardness is 45, showing an excellent fast-curing property. The time change value was 1.07 to 1.48, showing good storage stability, and the Shore hardness change value was 0.78 to 0.96, showing good storage stability.

  From the above, the self-leveling material of the present embodiment has good storage stability, it is possible to prepare a self-leveling material slurry having excellent fluidity, and excellent fast hardening and quick drying properties. It was confirmed that a cured product having the above can be formed.

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 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 has a water content of 0.35 to less than 1.00%.
Self-leveling material.   The self-leveling material according to claim 1, wherein the fine aggregate has a coarse particle ratio of 0.60 to 1.40 and a water absorption of 3.00% or less. 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.