JP5593765B2 - Self-leveling hydraulic composition - Google Patents

Description

  The present invention relates to a self-leveling hydraulic composition capable of obtaining a mortar cured body having a good surface state while having both excellent fluidity and material separation resistance. More specifically, the present invention relates to a self-leveling hydraulic composition that can be used for level adjustment of the top edge of foundation concrete such as a house.

  Patent Document 1 discloses a low-shrinkage self-leveling material having excellent fluidity, good workability, no material separation, excellent surface hardness after curing (Shore hardness) and good surface accuracy. Disclosed is a self-leveling cement composition characterized by comprising 0.1 to 0.45% by weight of aluminum sulfate as a main component and aluminum sulfate based on the total amount of cement and aggregate. ing.

In Patent Document 2, as a high-strength self-leveling cement composition that is excellent in fluidity and self-smoothness, particularly extremely high in compressive strength after curing and adhesive strength with a base, a Blaine specific surface area is 7000 compared to Portland cement. A high-strength self-leveling cement composition comprising 5 to 30% by weight of one or more inorganic finely pulverized powders selected from the group consisting of -30000 cm ² / g limestone powder, fly ash, and granulated blast furnace slag Is disclosed.

  Patent Document 3 discloses a self-leveling hydraulic composition comprising a main component composed of Portland cement, fine aggregate, admixture and expansion material, and aluminum sulfate, shrinkage reducing agent, limestone fine powder, thickener and water retention agent. A self-leveling hydraulic composition is disclosed, wherein the thickener is a thickener of a cellulose-based water-soluble polymer, and the water-retaining agent is a water-retaining agent of a polyether-based water-soluble polymer. Yes.

  Patent Document 4 describes a construction method for a foundation concrete structure for buildings, which includes pouring and curing a hydraulic mortar prepared by kneading a self-leveling hydraulic composition and water. . Moreover, in the construction method described in Patent Document 4, the self-leveling hydraulic composition is composed of a main component composed of Portland cement, fine aggregate, admixture, and expansion material, aluminum sulfate, shrinkage reducing agent, limestone fine powder, It includes a thickener and a water retention agent, the thickener is a thickener of a cellulose water-soluble polymer, and the water retention agent is a water retention agent of a polyether water-soluble polymer.

JP-A-8-333150 JP-A-8-208285 JP 2008-247666 A JP 2008-248554 A

  An object of the present invention is to provide a self-leveling hydraulic composition that has both good workability and excellent cured body characteristics in obtaining a foundation concrete structure for buildings. When bolts are arranged at the place where the self-leveling hydraulic composition is applied, cracks (such as the part around the bolt and the part along the mold) at the initial stage when the self-leveling hydraulic composition is cured. There is a problem that cracks occur. Therefore, an object of the present invention is to obtain a self-leveling hydraulic composition that can reduce initial cracks in a cured mortar.

  In order to solve the above problems, the present inventors have conducted intensive research and completed the present invention.

  That is, the present invention is a self-leveling hydraulic composition comprising a main component comprising Portland cement, fine aggregate, an admixture and an expander, and aluminum sulfate, a shrinkage reducing agent, limestone fine powder and a thickener. The thickener is a self-leveling hydraulic composition that is a thickener containing two types of cellulose-based water-soluble polymers having different viscosities. By using the self-leveling hydraulic composition of the present invention, it is possible to reduce initial cracks of the mortar cured body, particularly initial cracks around the bolt and along the mold.

Preferred embodiments of the self-leveling hydraulic composition of the present invention are shown below. In the present invention, these embodiments can be appropriately combined.
(1) The main component is 100 parts by weight of Portland cement, 100 to 400 parts by weight of fine aggregate, 5 to 150 parts by weight of admixture, and 3 to 30 parts by weight of an expanding material, and the thickener is 20% of 2% aqueous solution. A high-viscosity cellulose-based water-soluble polymer with a viscosity at 20,000 to 50,000 mPa · s and a low-viscosity cellulose with a 2% aqueous solution having a viscosity at 20 ° C. of 50 to 6,000 mPa · s It consists of a water-soluble polymer, and the total content of Portland cement and fine aggregate is 100 parts by mass, the content of aluminum sulfate is 0.1 to 0.7 parts by mass, and the content of fine limestone powder is 11 to 35 parts by mass The content of the high-viscosity type cellulose water-soluble polymer is 0.005 to 0.2 parts by mass, and the content of the low-viscosity type cellulose water-soluble polymer is 0.04 to 0.2. It is a quantity part. When the content of the high-viscosity type and the low-viscosity type cellulose-based water-soluble polymer is in the above range, the initial crack can be reliably reduced.
(2) The content of the shrinkage reducing agent is 0.1 to 3 parts by mass with respect to 100 parts by mass in total of the main components. By mix | blending a shrinkage reducing agent, generation | occurrence | production of the crack at the time of hardening can be suppressed and durability can be improved.
(3) The self-leveling hydraulic composition further includes fibers, and the fiber content is 0.01 to 5 parts by mass with respect to 100 parts by mass in total of the main components. By containing the fiber, a cured product having excellent bending strength and hardly or hardly causing cracks can be stably obtained.
(4) The self-leveling hydraulic composition further includes a fluidizing agent and an antifoaming agent, and the content of the fluidizing agent is 0.01 to 3 parts by mass with respect to a total of 100 parts by mass of the main component, Content of an antifoamer is 0.01-3 mass parts with respect to a total of 100 mass parts of a main component. When the fluidizing agent and the antifoaming agent are in the above ranges, an effect that is economically commensurate with the content can be achieved.
(5) The self-leveling hydraulic composition further contains another setting modifier other than aluminum sulfate. By including a setting regulator, the pot life of the self-leveling hydraulic composition can be adjusted.
(6) The self-leveling hydraulic composition is a self-leveling hydraulic composition for adjusting the level of the top edge of the residential foundation concrete. By using the self-leveling hydraulic composition of the present invention, excellent workability can be obtained, and a high strength residential foundation concrete structure with high smoothness and reduced initial cracks is formed in a short construction period. be able to.

  Moreover, this invention is a hydraulic mortar obtained by knead | mixing the above-mentioned self-leveling hydraulic composition and water. By using the hydraulic mortar of the present invention, excellent workability can be obtained, and a high strength residential foundation concrete structure with high smoothness and reduced initial cracks can be formed in a short construction period.

  Moreover, this invention is a mortar hardening body obtained by hardening the above-mentioned hydraulic mortar. With the mortar hardened body of the present invention, a high-strength residential foundation concrete structure with reduced initial cracks can be obtained.

  According to the present invention, a self-leveling hydraulic composition having both good workability and excellent cured body characteristics can be obtained. Further, according to the present invention, even when a bolt is arranged at a place where a self-leveling hydraulic composition is applied, the initial crack of the mortar cured body, particularly the initial crack around the bolt and along the formwork is reduced. A self-leveling hydraulic composition that can be obtained can be obtained.

It is a figure which shows the outline of self-leveling property evaluation using SL measuring device. It is a perspective view which shows typically the mortar merge location at the time of pouring and constructing hydraulic mortar. It is a plane schematic diagram of an example of the mortar hardening body which has a corner | angular part obtained by pouring and constructing hydraulic mortar.

  The self-leveling hydraulic composition of the present invention contains the main components consisting of Portland cement, fine aggregate, admixture and expansion material, and further contains aluminum sulfate, shrinkage reducing agent, limestone fine powder and thickener. The self-leveling hydraulic composition of the present invention is characterized in that the thickener is a thickener containing two types of cellulose-based water-soluble polymers having different viscosities. If the hydraulic mortar of the self-leveling hydraulic composition of the present invention is used, initial cracks of the mortar cured body (cracks generated within one day after pouring of the hydraulic mortar), particularly around bolts and along the formwork The initial crack can be reduced. The present invention will be described below.

  The main components of the self-leveling hydraulic composition of the present invention are composed of Portland cement, fine aggregate, admixture and expansion material.

  Portland cement, which is one of the main components and is a hydraulic component, includes ordinary Portland cement, early-strength Portland cement, ultra-high-strength Portland cement, medium-heated Portland cement, sulfate-resistant Portland cement, low-heat Portland cement that conforms to JIS. And white Portland cement and combinations thereof. Further, instead of Portland cement, mixed cement such as blast furnace cement, fly ash cement and silica cement can be used.

  The self-leveling hydraulic composition of the present invention contains fine aggregate as one of the main components. Fine aggregates include silica sand, river sand, sea sand, mountain sand and crushed sand, alumina clinker, silica powder, clay mineral, waste FCC catalyst and inorganic materials such as limestone, urethane crushed, EVA foam and foaming resin It can select suitably from resin pulverized materials etc., such as. In particular, as the fine aggregate, one or a mixture of two or more selected from sands such as quartz sand, river sand, sea sand, mountain sand, crushed sand, waste FCC catalyst, quartz powder and alumina clinker is preferably used. it can.

  The particle size of the fine aggregate is preferably 2 mm or less, more preferably 1 mm or less, more preferably 0.7 mm or less, particularly preferably 0.6 mm or less. Those having a particle size of can be suitably used. The particle size of the fine aggregate is measured using several sieves having different nominal dimensions defined in JIS / Z-8801.

  The content of the fine aggregate in the self-leveling hydraulic composition of the present invention is preferably 100 to 400 parts by mass, more preferably 120 to 350 parts by mass, and more preferably 140 parts per 100 parts by mass of Portland cement. It is -320 mass parts, Most preferably, it is the range of 150-300 mass parts. When the content of the fine aggregate in the self-leveling hydraulic composition of the present invention is within the above range, a mortar slurry excellent in fluidity and material separation resistance can be obtained, and the surface state is excellent. It is preferable because a high-strength cured product can be obtained.

  Examples of the admixture that is one of the main components include slag powder such as fly ash and blast furnace slag fine powder, and these can be used alone or in combination of two or more. In particular, bending and compressive strength can be increased by including blast furnace slag fine powder. Therefore, the admixture preferably contains blast furnace slag fine powder.

An admixture having a fineness (Brain specific surface area) of 3,000 to 5,000 cm ² / g can be preferably used. If the Blaine specific surface area of the admixture is less than 3,000 cm ² / g, the effect of increasing the material separation resistance of the mortar slurry will be poor, and the hydration reactivity of the admixture will be poor. On the other hand, when the Blaine specific surface area of the admixture exceeds 5,000 cm ² / g, the tendency of the viscosity of the mortar slurry to increase becomes remarkable, and the fluidity may be inhibited.

  The content of the admixture in the self-leveling hydraulic composition of the present invention is preferably 5 to 150 parts by mass, more preferably 10 to 120 parts by mass, and still more preferably 15 to 100 parts by mass of Portland cement. It is suitable that it is in the range of 90 parts by mass, particularly preferably 20 to 80 parts by mass. When the admixture has a content in the above range, a mortar cured product having excellent surface properties and compressive strength can be obtained.

  Examples of the expansion material that is one of the main components include expansion materials mainly composed of ettringite-based calcium sulfoaluminate, expansion materials mainly composed of calcium oxide, aluminum oxide and sulfur trioxide, and lime-based materials such as quick lime. Examples of the expansion material and gypsum-based expansion material such as gypsum, and the like can be used as one or a mixture of two or more of these expansion materials. As the expansion material, it is preferable to use a gypsum-based expansion material, particularly an expansion material containing gypsum or gypsum.

  The content of the expanding material in the self-leveling hydraulic composition of the present invention is preferably 3 to 30 parts by mass, more preferably 5 to 25 parts by mass, and more preferably 8 to 100 parts by mass with respect to 100 parts by mass of Portland cement. It can be in the range of 20 parts by weight, particularly preferably 10-18 parts by weight. It is preferable for the inflatable material to be in the above-mentioned content range because appropriate expansibility can be expressed and the change in the length of the mortar cured body can be suppressed, and at the same time, generation of cracks due to excessive expansion action can be prevented.

  Gypsum that is particularly preferably used as the expansion material is gypsum such as anhydrous and semi-water. Regardless of the type of gypsum such as anhydrous and semi-water, the expansion material can be used as one kind or a mixture of two or more kinds thereof.

  Examples of limes preferably used as the expansion material include quick lime, slaked lime, calcined dolomite, and the like, and can be used as one kind or a mixture of two or more kinds thereof.

  The self-leveling hydraulic composition of the present invention comprises aluminum sulfate, a shrinkage reducing agent, fine limestone powder, and a cellulose-based water-soluble polymer thickener, together with main components comprising Portland cement, fine aggregate, admixture and expansion material. Including.

  Aluminum sulfate contained in the self-leveling hydraulic composition of the present invention has a function as a setting accelerator. The content of aluminum sulfate is preferably 0.1 to 0.7 parts by mass, more preferably 0.15 to 0.6 parts by mass with respect to the total amount (100 parts by mass) of Portland cement and fine aggregate. More preferably, the range is 0.2 to 0.5 parts by mass, and particularly preferably 0.25 to 0.45 parts by mass. By making the content of aluminum sulfate in the above range, it is possible to obtain a good strength enhancement effect, and it is possible to obtain a good effect of reducing shrinkage of the cured product due to this early strength development. When there is too little content of aluminum sulfate, the expression of the shrinkage reduction effect will be insufficient. In addition, the shrinkage reduction effect increases as the content of aluminum sulfate increases, but if added excessively, the setting effect of cement becomes prominent and fluidity of the mortar slurry decreases, and fine cracks appear in the hardened body. May occur. Therefore, the content of aluminum sulfate is preferably in the above range.

  The self-leveling hydraulic composition of the present invention contains a shrinkage reducing agent. By adding a shrinkage reducing agent to the self-leveling hydraulic composition of the present invention within a range that does not impair the characteristics, the occurrence of cracks during curing can be suppressed and durability can be improved.

  A known shrinkage reducing agent can be used as the shrinkage reducing agent. As the shrinkage reducing agent, in particular, those having an alkylene oxide polymer represented by the following chemical formula (1) in the skeleton of the chemical structure can be suitably used.

（但し式（１）中、Ｒ^１及びＲ^２は、互いに独立してアルキル基、フェニル基、シクロアルキル基、水素基などであり、Ａは炭素数２〜３の１種のアルキレン基（エチレン基、プロピレン基）又はランダム若しくはブロック重合させた２種のアルキレン基であり、ｎは２〜２０の整数である。）

(In the formula (1), R ¹ and R ² are each independently an alkyl group, a phenyl group, a cycloalkyl group, a hydrogen group, etc., and A is an alkylene group having 2 to 3 carbon atoms (ethylene Group, propylene group) or two kinds of random or block polymerized alkylene groups, and n is an integer of 2 to 20.)

  As the shrinkage reducing agent, for example, polyalkylene glycols such as polypropylene glycol and poly (propylene / ethylene) glycol and generally known ones such as alkoxy poly (propylene / ethylene) glycol having 1 to 6 carbon atoms are appropriately selected and used. be able to.

  The content of the shrinkage reducing agent relative to the self-leveling hydraulic composition can be appropriately selected according to the content of the main component and subcomponent used. For example, the content of the shrinkage reducing agent is preferably 0.1 to 3 parts by mass, more preferably 0.15 to 2 parts by mass, and more preferably 0.18 to 1 part by mass with respect to 100 parts by mass of the main component. More preferably, the content is 0.2 to 0.8 parts by mass.

  The self-leveling hydraulic composition of the present invention contains limestone fine powder. When the self-leveling hydraulic composition of the present invention contains fine limestone powder, the fluidity excellent in the hydraulic mortar, in particular, the excellent flow rate is provided, and the material separation resistance is improved, and further high. A mortar cured body having compressive strength can be obtained.

  As content of the limestone fine powder with respect to a self-leveling hydraulic composition, Preferably it is 11-35 mass parts with respect to the total amount (100 mass parts) of Portland cement and a fine aggregate, More preferably, it is 12-33 masses. Parts, more preferably 13 to 31 parts by mass, particularly preferably 14 to 30 parts by mass. By using the limestone fine powder in the above content range, a hydraulic mortar slurry having good fluidity and excellent material separation resistance can be obtained. Further, by using the hydraulic mortar slurry, a mortar cured body having a good surface state and excellent compressive strength can be obtained.

  If the content of fine limestone powder with respect to the self-leveling hydraulic composition is too small, it becomes difficult to obtain good material separation resistance, and the effect of improving the strength of the cured product becomes insufficient. Conversely, if the addition of fine limestone powder to the self-leveling hydraulic composition is excessive, the viscosity of the hydraulic mortar / slurry tends to increase and the fluidity is lowered. For this reason, it is preferable that content of limestone fine powder is the said range.

As the fineness (brane specific surface area) of the fine limestone powder, a powder having a fine particle size of 3,000 to 5,000 cm ² / g can be suitably used. When the specific surface area of the brane is less than 3,000 cm ² / g, the effect of increasing the material separation resistance of the mortar slurry becomes poor. On the other hand, if the Blaine specific surface area exceeds 5,000 cm ² / g, the tendency of the viscosity of the mortar slurry to increase becomes remarkable and flowability may be impaired.

  In the self-leveling hydraulic composition of the present invention, the self-leveling property of the hydraulic mortar and the material separation resistance are balanced at a high level, and further, the surface of the hydraulic mortar is dried in the initial stage of hardening of the hydraulic mortar. In order to suppress the occurrence of cracks and avoid the occurrence of cracks, a thickener containing two types of water-soluble cellulose-based polymers having different viscosities is used.

  The thickener contained in the self-leveling hydraulic composition of the present invention has a 2% aqueous solution having a viscosity at 20 ° C. of 20,000 to 50,000 mPa · s, preferably 20,000 to 40,000 mPa · s. The viscosity at 20 ° C. of the high-viscosity cellulose-based water-soluble polymer and 2% aqueous solution is 50 to 6,000 mPa · s, preferably 50 to 4,000 mPa · s, more preferably 100 to 2,000 mPa · s. It consists of a low-viscosity cellulosic water-soluble polymer. In this specification, the viscosity means a 2% aqueous solution of a cellulose-based water-soluble polymer at a rotational speed of 12 rpm and 20 ° C. using a B-type viscometer (digital viscometer DVL-B type manufactured by Toki Sangyo Co., Ltd.). The measured value.

  Specific examples of thickeners include water-soluble polymers such as cellulose derivatives such as methylcellulose, hydroxyethylcellulose, hydroxypropylmethylcellulose, hydroxyethylmethylcellulose, glyoxal-added hydroxypropylmethylcellulose and carboxymethylcellulose. 1 type, or 2 or more types of mixtures selected from these can be used.

  The viscosity of the cellulose-based water-soluble polymer contained in the thickener can be adjusted by selecting one having a predetermined viscosity from commercially available thickeners. As a thickener containing a cellulose-based water-soluble polymer, various types having different viscosities are commercially available.

The content of the high-viscosity cellulosic water-soluble polymer contained in the thickener is 0.005 to 0.2 parts by mass, preferably with respect to the total amount (100 parts by mass) of Portland cement and fine aggregate. Is preferably 0.008 to 0.1 parts by mass, more preferably 0.01 to 0.07 parts by mass. The content of the low-viscosity cellulose-based water-soluble polymer contained in the thickener is 0.04 to 0.2 parts by mass with respect to the total amount (100 parts by mass) of Portland cement and fine aggregate. , Preferably 0.05 to 0.17 parts by mass, more preferably 0.06 to 0.14 parts by mass. When the content of the high-viscosity type and low-viscosity type cellulosic water-soluble polymers is in the above range, the effect of the present invention can be ensured. In addition, when the content of the thickener is reduced, the effect of the thickener is reduced, and when the content of the thickener is increased, the fluidity may be lowered. The proportion of the low- viscosity cellulose-based water-soluble polymer in the total thickener is not particularly limited, but is 40% by mass or more, preferably 50% by mass or more, more preferably 60% by mass or more, particularly Preferably it is 70 mass% or more.

  By adding a predetermined thickener to the self-leveling hydraulic composition of the present invention, the effect of increasing the material separation resistance of a hydraulic mortar having particularly excellent fluidity is remarkable, and the fluidity of the mortar is improved. Material separation can be avoided and suppressed with almost no loss. Therefore, it is possible to prevent the occurrence of cracks by suppressing the drying of the surface of the hydraulic mortar in the initial stage of hardening of the hydraulic mortar, and in particular, the initial crack around the bolt of the hydraulic mortar, specifically the crack The width and length, especially the crack length, can be reduced. Specifically, if the self-leveling hydraulic composition of the present invention having a predetermined thickener is used, the crack width is 0.25 mm or less, preferably 0 in the initial crack around the bolt of the hydraulic mortar. 0.15 mm or less, and the crack length can be less than 10 mm. If the thickener is a high-viscosity cellulose-based water-soluble polymer alone, initial cracks around the bolt cannot be sufficiently suppressed, and the low-viscosity-type cellulose-based water-soluble polymer alone can cause problems such as material separation and whitening. This is not preferable.

  The self-leveling hydraulic composition contains one or more of a setting adjuster (setting retarder and setting accelerator), a fluidizing agent (water reducing agent), an antifoaming agent, a resin powder, and a fiber as necessary. be able to.

  The self-leveling hydraulic composition of the present invention can contain a setting modifier other than aluminum sulfate, if necessary. As the setting regulator, a setting retarding agent that is a component that delays the setting and a setting accelerator that is a component that accelerates the setting can be used alone or in combination.

  In the self-leveling hydraulic composition of the present invention, the fluidity, pot life and curing properties are adjusted by appropriately selecting the components, content and mixing ratio of the setting retarder and / or setting accelerator. Can do. Specifically, by appropriately performing the above selection, at 20 ° C., the pot life of the self-leveling hydraulic composition can be adjusted to an arbitrary time from about several minutes to about 1 hour.

  As the setting accelerator, a known setting accelerator can be used. Examples of setting accelerators include lithium salts, specifically, lithium carbonate, lithium chloride, lithium sulfate, lithium nitrate, lithium hydroxide and other inorganic lithium salts, lithium acetate, lithium tartrate, lithium malate, lithium citrate, etc. One or more selected from organic lithium salts and metal sulfates other than aluminum sulfate can be preferably used. In particular, by using aluminum sulfate and potassium sulfate in combination, a stable setting promoting effect can be obtained. Moreover, it is preferable to use aluminum sulfate and potassium sulfate as a setting accelerator from the point of availability and low cost.

  When using potassium sulfate as a setting accelerator, the amount used (content) is preferably 0.1 to 0.9 parts by mass with respect to the total amount (100 parts by mass) of Portland cement and fine aggregate. More preferably, it is 0.15-0.8 mass part, More preferably, it is 0.2-0.75 mass part, Especially preferably, it is preferable that it is the range of 0.25-0.7 mass part. When the content of potassium sulfate is in the above range, it is possible to obtain a good strength enhancement effect for hydraulic mortar.

  As the particle size of the setting accelerator, it is preferable to use a particle which does not interfere with the characteristics of the self-leveling hydraulic composition of the present invention. Specifically, the particle size of the setting accelerator is preferably 50 μm or less.

  As the setting retarder, a known setting retarder can be used. Examples of setting retarders include sodium salts, specifically selected from inorganic sodium salts such as sodium sulfate and sodium bicarbonate, and organic sodium salts such as sodium tartrate, sodium malate, sodium citrate and sodium gluconate. The above can be used.

  The content of the setting retarder in the self-leveling hydraulic composition of the present invention is preferably 0.01 to 1.0 part by mass with respect to the total amount (100 parts by mass) of Portland cement and fine aggregate. More preferably, it is 0.02-0.85 mass part, More preferably, it is 0.025-0.8 mass part, Most preferably, it is the range of 0.03-0.75 mass part. When the content of the setting retarder is in the above range, preferable workability can be obtained.

  As a fluidizing agent, naphthalene sulfonate formalin condensate, olefin unsaturated carboxylic acid copolymer salt, lignin sulfonate, casein, casein calcium, polyether-based and polycarboxylic acid-based fluidizing agents are commercially available. A thing can be used as those 1 type, or 2 or more types of mixtures irrespective of the kind. The fluidizing agent can also have a water reducing effect.

  A fluidizing agent (water reducing agent) can be added as long as the characteristics of the present invention are not impaired. The content of the fluidizing agent (water reducing agent) in the self-leveling hydraulic composition of the present invention is preferably 0.01 to 3 parts by mass, more preferably 0.02 to 2 parts per 100 parts by mass of the main component. Part by mass, more preferably 0.04 to 1 part by mass, particularly preferably 0.06 to 0.5 part by mass. If the content of the fluidizing agent (water reducing agent) is too small, sufficient effects are not exhibited. Moreover, even if the content of the fluidizing agent (water reducing agent) is too much, an effect commensurate with the content cannot be expected and not only is uneconomical, but the amount of kneading water to obtain the required fluidity increases, At the same time, the viscosity increases and the filling property may deteriorate.

  In the self-leveling hydraulic composition of the present invention, it is preferable to use an antifoaming agent in combination with the above thickener. When the self-leveling hydraulic composition of the present invention contains an antifoaming agent, it has a favorable effect on the suppression of separation of fine aggregates contained in the main component, suppression of bubble generation and improvement of the surface of the cured body, and self-leveling. The characteristics as a material can be improved.

  Anti-foaming agents contained in the self-leveling hydraulic composition of the present invention include known synthetic materials such as silicon-based, alcohol-based and polyether-based materials, mineral oils derived from petroleum refining, and plant-derived natural materials. One or more types can be selected and used.

  An antifoamer can be added in the range which does not impair the characteristic of the self-leveling hydraulic composition of this invention. The content of the antifoaming agent in the self-leveling hydraulic composition of the present invention is preferably 0.01 to 3 parts by mass, more preferably 0.02 to 1.5 parts by mass with respect to 100 parts by mass of the main component. Part, more preferably 0.03 to 1 part by weight, particularly preferably 0.04 to 0.5 part by weight. When the content of the antifoaming agent is within the above range, a good antifoaming effect is recognized, and the fluidity of the hydraulic mortar slurry and the finish of the cured body surface can be adjusted favorably.

  The self-leveling hydraulic composition of the present invention can contain fibers. Fibers include polyethylene, ethylene / vinyl acetate copolymer (EVA), polyolefins such as polypropylene, organic fibers composed of resin components such as polyester, polyamide, polyvinyl alcohol, and polyvinyl chloride, and metal systems such as stainless steel fibers and aluminum fibers. A fiber etc. can be used and it can use as a 1 type, or 2 or more types of mixture of these.

  The fiber contained in the self-leveling hydraulic composition of the present invention is preferably an organic fiber because of its low cost and easy handling. The fiber length of the organic fiber is preferably about 0.5 to 15 mm.

  The content of the fiber with respect to the self-leveling hydraulic composition of the present invention is preferably 0.01 to 5 parts by mass, more preferably 0.02 to 2 parts by mass, and still more preferably 0 with respect to 100 parts by mass of the main component. 0.03 to 1 part by mass, particularly preferably 0.05 to 0.2 part by mass. By containing the fiber of the above-mentioned content with respect to the self-leveling hydraulic composition of the present invention, it is possible to stably obtain a cured product that is excellent in bending strength and hardly or does not generate cracks.

  The self-leveling hydraulic composition of the present invention can contain a resin powder. As the resin powder, polymer particles (such as re-emulsified resin particles) obtained by removing a liquid component from a known polymer emulsion for construction or building materials can be used. For example, polymer resin particles obtained by removing a liquid component of a polymer emulsion obtained by emulsion polymerization of an α, β-ethylenically unsaturated monomer can be used as the resin powder.

  The resin powder content of the self-leveling hydraulic composition of the present invention is preferably 0.001 to 10 parts by mass, more preferably 0.005 to 8 parts by mass, and still more preferably 100 parts by mass of the main component. The amount can be 0.01 to 5 parts by mass, particularly preferably 0.05 to 2 parts by mass.

Examples of the α, β-ethylenically unsaturated monomer that can be used as the resin powder include known α, β-ethylenically unsaturated monomers. Examples of the α, β-ethylenically unsaturated monomer include acrylic acid and derivatives thereof such as esters, methacrylic acid and derivatives such as esters, α-olefins such as ethylene and propylene, aromatics such as vinyl acetate and styrene. Tertiary fatty acid vinyl esters having 9 to 11 carbon atoms (R—COO—CH═CH ₂ , R is a tertiary carbon having 9 to 11 carbon atoms, such as vinyls, vinyl chloride, and versatic acid vinyl esters. ) And the like.

  A hydraulic mortar can be produced by blending and kneading the self-leveling hydraulic composition of the present invention and water. Moreover, since the mortar flow (flow value) of hydraulic mortar can be adjusted by selecting the compounding quantity of water suitably, the hydraulic mortar suitable for a use can be manufactured.

  In the self-leveling hydraulic composition of the present invention, the amount of water is preferably 10 to 70 parts by weight, more preferably 20 to 50 parts by weight, and still more preferably 23 to 40 parts by weight with respect to 100 parts by weight of the main component. Part.

  The self-leveling hydraulic composition of the present invention preferably has a flow value of a hydraulic mortar prepared by mixing with water (measured according to the test method described in JASS 15M-103), preferably 180 to 270 mm, More preferably, it is adjusted to 200 to 260 mm, and more preferably 210 to 250 mm. Due to the flow value being in the above range, hydraulic mortar has ease of construction and excellent fluidity, in particular, stably exhibits excellent mortar flow rate, has high horizontal level accuracy, The familiarity of the confluence of the slurry is excellent.

  The self-leveling hydraulic composition of the present invention preferably has an SL flow rate (L0) (sec / 200 mm) using a hydraulic mortar SL meter (FIG. 1) prepared by mixing with water, preferably 2 to It is preferably adjusted to a range of 9 seconds, more preferably a range of 2.5 to 8 seconds. Due to the SL flow rate (L0) being in the above range, the hydraulic mortar stably demonstrates the ease of construction and the excellent mortar flow rate, and the horizontal level accuracy is high. The familiarity of is excellent.

  The self-leveling hydraulic composition of the present invention can be used as a mortar for pouring, troweling and spraying in applications such as plastering materials, roofing materials, flooring materials and waterproofing materials. Furthermore, the self-leveling hydraulic composition of the present invention can be used in the civil engineering, construction, and construction fields as a cross-sectional restoration material or grout material used for repairing or reinforcing civil engineering structures.

  In particular, the self-leveling hydraulic composition of the present invention exhibits excellent performance in concrete surface finishing, top surface finishing (level adjustment) of residential foundation concrete, and the like. In FIG. 2, the example of the construction method in the case of using the hydraulic mortar using the self-leveling hydraulic composition of this invention for construction of a top end is shown. If the self-leveling hydraulic composition of the present invention is used, it is possible to provide a highly reliable concrete structure by forming a high-strength mortar hardened body with improved construction efficiency and high horizontal level accuracy. it can.

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

(Flow evaluation of hydraulic mortar)
The flow value is measured according to the test method described in JASS 15M-103. A pipe made of vinyl chloride (internal volume: 100 ml) having an inner diameter of 50 mm and a height of 51 mm is placed on a glass sheet having a thickness of 5 mm, filled with kneaded hydraulic mortar, 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.

(SL evaluation of hydraulic mortar)
Using a SL (self-leveling) measuring instrument shown in FIG. 1, a rail is provided on a rail having a width of 30 mm × a height of 30 mm × a length of 750 mm and a length of 150 mm from the tip, and the hydraulic mortar immediately after kneading is provided. A predetermined amount is filled and molded. Immediately after molding, the weir plate is pulled up, and after stopping the flow of hydraulic mortar, measure the distance from the gage (installed portion of the weir plate) to the shortest portion of the flow of hydraulic mortar, and the value (SL value) Let L0. Further, the time required for hydraulic mortar to flow 200 mm from the weir plate is measured, and the measurement time is defined as SL flow rate (L0) (second / 200 mm).

  Similarly, after 30 minutes after molding, the weir plate is pulled up, and after stopping the flow of hydraulic mortar, the distance from the gauge point (the installation portion of the weir plate) to the shortest portion of the flow of hydraulic mortar is measured, and the value ( SL value) is set to L30. Moreover, the time required for hydraulic mortar to flow 200 mm from the weir plate is measured, and the measurement time is defined as SL flow rate (L30) (second / 200 mm).

(Evaluation of material separation resistance of hydraulic mortar)
Using the SL measuring device shown in FIG. 1, a barrier plate is provided on a rail having a width of 30 mm × a height of 30 mm × a length of 750 mm and a length of 150 mm from the tip, and a predetermined amount of slurry immediately after kneading is filled and molded. Immediately after molding, the weir plate is pulled up, and after the flow of the hydraulic mortar is stopped, the material separation state of the fine aggregate and the paste is evaluated by palpation at the head of the flow of the hydraulic mortar.

(Evaluation of surface condition after curing)
As shown in FIG. 2, the foundation concrete is placed, and after watering, hydraulic mortar is poured onto the foundation concrete and exposed to the outside air, and the surface of the obtained cured product is visually observed and evaluated. Evaluation was made on five items: surface whitening, initial cracks (cracks generated within one day after casting of hydraulic mortar), irregularities, bubble traces and floats.
・ Evaluation of whitening: (O: No whitening, Δ: Some whitening was observed, ×: Whitening was recognized.)
・ Evaluation of initial cracks: The presence or absence of cracks was evaluated on the boundary between the daily allowance and shade, around the bolts, and other parts. When there was a crack, the width and length were measured.
・ Evaluation of surface irregularities: (O: performed in three stages: irregularities were 0, Δ: about 1 to 5 irregularities, and x: many irregularities were observed.)
・ Evaluation of bubble marks: (○: No bubble marks, ×: Bubble marks)
-Evaluation of float: The ratio of the float 7 days after construction was measured.

(1) Materials used: The following materials were used. The viscosity of thickeners A and B was determined by using a B-type viscometer (digital viscometer DVL-B type manufactured by Toki Sangyo Co., Ltd.) with a 2% aqueous solution of a cellulose-based water-soluble polymer. Measured at ° C. The B-type viscometer is a viscometer that measures the viscous resistance torque of the liquid acting on the rotor when the cylindrical rotor is rotated in the liquid. In the B type viscometer, it is necessary to select the type of rotor according to the viscosity to be measured. To measure the viscosity of thickener A, rotor No. for DVL-B type manufactured by Toki Sangyo Co., Ltd. 4 for measuring the viscosity of thickener B. 1 was used.
Portland cement: Hayashi Cement, manufactured by Ube Mitsubishi Cement, Blaine specific surface area of 4,500 cm ² / g.
-Fine aggregate A: quartz sand, Takano No. 6 (Takano Shoji).
-Fine aggregate B: Silica sand, N70 (Ashiya).
Admixture: Blast furnace slag, manufactured by Kawasaki Steel Corporation, liberment, Blaine specific surface area 4,400 cm ² / g.
Expandable material: gypsum, manufactured by Asahi Glass Co., Ltd., hydrofluoric acid anhydrous gypsum, Blaine specific surface area 3,300 cm ² / g.
-Setting accelerator A: Potassium sulfate, manufactured by Ueno Pharmaceutical Co., Ltd.
-Setting accelerator B: Aluminum sulfate, manufactured by Daimei Chemical Co., Ltd., S150.
-Limestone fine powder: Calcium carbonate fine powder, manufactured by Yuesu Mining Co., Ltd., TM-1, No. Blaine surface area 4,830 cm ² / g.
Thickener A: MX30000 (high viscosity type cellulose water-soluble polymer), Matsumoto Yushi Seiyaku Co., Ltd., viscosity 30000 mPa · s.
Thickener B: MP400 (low viscosity type cellulose water-soluble polymer), manufactured by Matsumoto Yushi Seiyaku Co., Ltd., viscosity 400 mPa · s.
・ Shrinkage reducing agent: Hibidan, manufactured by Takemoto Yushi Co., Ltd.
・ Fluidizing agent: Polycarboxylic acid-based water reducing agent (commercially available, for building materials).
-Antifoaming agent B: ADEKA company make, Adecanate B115F.
-Setting retarder: Sodium gluconate, manufactured by Tomita Pharmaceutical.
Resin powder: Nippon Synthetic Chemical Co., Ltd., Movinyl Powder DM200.
-Fiber: Polyester fiber, manufactured by Kyoto Textile Materials Co., Ltd., fiber length: 2 mm.

(Comparative Examples 1-3, Examples 1-3)
The components listed in Table 1 were mixed to produce a self-leveling hydraulic composition. Table 2 shows the content ratio of components such as a setting accelerator among the components shown in Table 1 when the total of Portland cement and aggregate is 100 parts by mass. Table 3 shows the content of components such as a shrinkage reducing agent among the components shown in Table 1 when the total of the main components (Portland cement, aggregate, admixture and expansion material) is 100 parts by mass. Indicates the percentage. Next, while stirring the inside of a polyethylene beaker (2.0 liters) containing water (0.26 kg) with a mixer, the self-leveling hydraulic composition so that the water / self-leveling hydraulic composition ratio is 0.26. A product (1 kg) was added and kneaded for 3 minutes to obtain a hydraulic mortar. The flow value, SL value and flow rate of the obtained hydraulic mortar were measured, and the tendency of material separation was evaluated. The results are shown in Table 4.

  About the mortar hardened | cured body of hydraulic mortar, evaluation of the surface state after 1 day of material age and evaluation of the float after 7 days of material age were performed. The results are shown in Table 5.

In the description of Table 5, the width and length of each part of the initial crack mean the following value range. In addition, as shown in FIG. 3, a “corner part” means a part that becomes a corner when the mortar cured body is shown in a schematic plan view.
Crack width; Thick: greater than 0.35 mm, Medium: 0.35-0.25 mm, Fine: 0.25-0.15 mm, Ultrafine: less than 0.15 mm, None: No crack.
Length of crack; length: more than 30 mm, medium: 30 to 10 mm, short: less than 10 mm, no: no crack.

  In Examples 1 to 3, hydraulic mortars were produced using a self-leveling hydraulic composition using a thickener containing a high-viscosity and low-viscosity type cellulosic water-soluble polymer. In the hydraulic mortars of Examples 1 to 3, it was possible to reduce initial cracks, particularly initial cracks around the bolts. Specifically, in Examples 1 and 3, the width of the initial crack around the bolt is less than 0.15 mm, the width of the initial crack in Example 2 is 0.25 to 0.15 mm, and the length is less than 10 mm. Met. Moreover, initial cracks did not occur at the daily allowance / shade boundary and other parts. That is, the hydraulic mortars obtained using the self-leveling hydraulic compositions of Examples 1 to 3 have excellent fluidity (flow value and SL flow rate) and material separation resistance while maintaining initial cracking. The occurrence of was solved.

  On the other hand, in Comparative Examples 1-3, Comparative Examples 1-3 in which hydraulic mortars were manufactured using a self-leveling hydraulic composition using a thickener containing one type of cellulose-based water-soluble polymer. In this hydraulic mortar, the initial cracks in the part around the bolt and the other part (the part along the mold) occurred with such a size as to cause a construction problem. Specifically, in Comparative Example 1, a crack having a width of 0.25 to 0.15 mm and a length of more than 30 mm occurred around the bolt. In Comparative Example 2, cracks having a width of 0.25 to 0.15 mm and a length of 30 to 10 mm occurred at the corners. In Comparative Example 3, a crack having a width of 0.25 to 0.15 mm and a length of more than 30 mm occurred around the bolt.

  From the above, by using the self-leveling hydraulic composition of the present invention, it is possible to obtain a mortar cured body having a good surface state while maintaining excellent slurry fluidity and material separation resistance. It became clear. In particular, when the flow rate of the slurry is large, it not only improves the efficiency at the time of construction, but also has a positive effect on the homogenization of the hydraulic mortar slurry at the location where the hydraulic mortar slurry constructed from multiple locations merges, It was revealed that the finished surface of the mortar cured body was improved. Therefore, by using the self-leveling hydraulic composition of the present invention for the level adjustment of the top end of the residential foundation concrete, it is possible to obtain excellent construction workability, high smoothness and high strength residential foundation concrete. It became clear that the structure can be formed in a short construction period.

17: Mortar cured body of self-leveling hydraulic composition 18: Corner

Claims (9)

The main components consisting of Portland cement, fine aggregate, admixture and expansion material, and
A self-leveling hydraulic composition comprising aluminum sulfate, shrinkage reducing agent, limestone fine powder and thickener,
Thickener, Ri thickeners der comprising two cellulose-based water-soluble polymers having different viscosity,
A thickener is a high-viscosity cellulose-based water-soluble polymer whose viscosity at 20 ° C. of a 2% aqueous solution is 20,000 to 50,000 mPa · s, and a viscosity at 20 ° C. of a 2% aqueous solution is 50 to 6,000 mPa A low-viscosity cellulose water-soluble polymer that is s,
The content of the high-viscosity type cellulose water-soluble polymer is 0.008 to 0.1 parts by mass and the content of the low-viscosity type cellulose water-soluble polymer with respect to 100 parts by mass of the total of Portland cement and fine aggregate Is 0.04 to 0.2 parts by mass, and the ratio of the low-viscosity type cellulose water-soluble polymer in the total thickener is 50% by mass or more.
Self-leveling hydraulic composition. The main component consists of 100 parts by weight of Portland cement, 100 to 400 parts by weight of fine aggregate, 5 to 150 parts by weight of admixture, and 3 to 30 parts by weight of expansion material,
For a total of 100 parts by mass of Portland cement and fine aggregate,
The content of aluminum sulfate is 0.1 to 0.7 parts by mass, and the content of fine limestone powder is 11 to 35 parts by mass,
The self-leveling hydraulic composition according to claim 1.   The self-leveling hydraulic composition according to claim 1 or 2, wherein the content of the shrinkage reducing agent is 0.1 to 3 parts by mass with respect to 100 parts by mass in total of the main components. The self-leveling hydraulic composition further comprises fibers,
The self-leveling hydraulic composition according to any one of claims 1 to 3, wherein the fiber content is 0.01 to 5 parts by mass with respect to 100 parts by mass in total of the main components. The self-leveling hydraulic composition further comprises a fluidizing agent and an antifoaming agent,
The content of the fluidizing agent is 0.01 to 3 parts by mass with respect to 100 parts by mass in total of the main components
The self-leveling hydraulic composition according to any one of claims 1 to 4, wherein the content of the antifoaming agent is 0.01 to 3 parts by mass with respect to 100 parts by mass in total of the main components.   The self-leveling hydraulic composition according to any one of claims 1 to 5, wherein the self-leveling hydraulic composition further contains another setting modifier other than aluminum sulfate.   The self-leveling hydraulic composition according to any one of claims 1 to 6, wherein the self-leveling hydraulic composition is a self-leveling hydraulic composition for adjusting the level of the top edge of residential foundation concrete. .   A hydraulic mortar obtained by kneading the self-leveling hydraulic composition according to claim 1 and water.   A mortar cured body obtained by curing the hydraulic mortar according to claim 8.

Images