JP2009235889A - Method of constructing waterproof floor structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a waterproof floor structure capable of preventing water from leaking to a lower story even if a washing operation for maintaining the aesthetic appearance and texture of covering materials such as natural stones and tiles is continuously performed when cracking or crazing occurs in a concrete floor itself in a concrete floor structure finished using plate-like materials such as natural stones and tiles. <P>SOLUTION: This method of constructing a waterproof floor structure comprises a step of forming a coating waterproof material layer 14 on the upper surface of the concrete floor 11 by applying a coating waterproof material thereonto and a step of laying down the plate-like facing materials 16 using a wall-mortar 15. The coating waterproof material comprises a primer cement-based primer 13 for coating film waterpoof material and a polymer cement-based coating film waterproof material 14. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a waterproof floor structure obtained by providing waterproofing to a concrete floor and further laying a plate-like finishing material, and a construction method thereof.

When finishing floors and walls of buildings such as condominiums and offices, a method of constructing natural stones and tiles such as ceramic plates to finish concrete surfaces with excellent aesthetics and texture may be adopted.

Patent Document 1 discloses a synthetic resin emulsion mixture and cement powder as a waterproof wall structure that simplifies the structure of the waterproof layer provided on the board in the waterproof wall structure and strengthens the waterproof and impact resistance of the joint portion. Applying a stretchable hydration-solidifying waterproof coating material directly on the board, forming a waterproof layer by interposing a non-woven fabric at the joint part of the board, and covering materials such as tiles with cement mortar on this waterproof layer A waterproof wall structure for bonding is disclosed.

Patent Document 2 relates to the fact that calcium ions are precipitated due to moisture from the front and back surfaces of tile joints, resulting in white problems. 1) A polymer cement mortar having a specific structure is waterproofed with a base It is applied as a conditioning mortar, and a tiled method that does not produce white flower characterized by a specific method of applying a pasting mortar and joint mortar having a specific configuration, and a waterproof base conditioning mortar having a specific configuration is a cement Tiling without white flakes, characterized in that it is a polymer cement mortar containing at least one kind of polymer dispersion for cement admixture and re-emulsifying type powder resin as solid content with respect to 100 parts by weight And pasted mortar and joint mortar with specific composition: 1) Silicic fine powder 2) water-soluble amino resin, 3) tiling method which does not cause efflorescence, characterized in that it contains at least one cement admixture polymer dispersion and re-emulsifying the powder resin is disclosed.

JP-A-10-317518 JP 2001-107536 A

  The surface of a concrete floor structure finished using a plate-like finishing material such as natural stone or porcelain plate has a feature that it is excellent in aesthetics and texture. However, even if the concrete floor is finished with a plate-like finishing material such as natural stone or porcelain, if the dirt accumulates on the surface of the finishing material during the long-term service, the initial aesthetics and texture will be lost. become. Therefore, it is effective to clean the surface of a concrete floor structure finished with a plate-like finishing material such as natural stone or porcelain as often as possible, to maintain its aesthetics and texture as it was originally constructed. It is. Generally, the most versatile cleaning method is cleaning by washing with water.

  On the other hand, the period during which a building is used varies depending on the structure, such as wooden, steel, or concrete, and in particular, the service period of a concrete building is generally said to be 50 years or 60 years. Even in a robust concrete building, in the process of being used for 50 to 60 years, even if unpredictable stress loads such as earthquakes are applied to the frame structure and the fatal loss of the structure does not occur, It is quite possible that cracks will occur in the wall or concrete floor. Furthermore, as mentioned above, the surface of the concrete floor is finished with a plate-like finishing material such as natural stone or ceramic plate, and in order to protect and maintain its beauty and texture, frequent washing operations are carried out. In such a case, the water accumulated on the floor during the washing process penetrates into the concrete foundation layer through the gaps between the plate-like finishing materials such as natural stone and ceramics, and the concrete floor itself has cracks and cracks. If it has occurred, there is a concern that water may drip into the lower floor through the crack or crack.

  The present invention uses a plate-like finishing material such as natural stone or porcelain, which is highly necessary to maintain the aesthetics and texture of the concrete building constructed on the premise of long-term use as described above, particularly by washing with water. With regard to the concrete floor structure to be finished, even if cracks or cracks occur in the concrete floor itself, water washing work is frequently performed without any hesitation to maintain the aesthetics and texture of finishing materials such as natural stone and ceramic plates. An object of the present invention is to provide a waterproof floor structure that does not cause water leakage to the lower floors and a method for constructing the waterproof floor structure even if it is continuously implemented.

  As a result of repeating diligent trial and error on the above problems, the present inventors have excellent foundation adhesion to the concrete floor top surface when finishing the floor surface of the concrete structure with a plate-like finishing material such as natural stone or tile. After forming a waterproof layer with excellent tensile and elongation properties, and using a mortar to lay plate finishing materials such as natural stone and tiles, cracks and cracks should occur in the concrete floor. Even in the case of water, a waterproof floor structure that does not cause water leakage to the lower floors even when frequent washing operations are performed to maintain the aesthetics and texture of the finishing materials such as natural stone and ceramic plates, and its construction A method was found to complete the present invention.

That is, the present invention
A waterproof floor structure comprising a step of applying a coating-type waterproofing material on an upper surface of a concrete floor to provide a coating-type waterproofing material layer, and a step of laying a plate-like finishing material on the upper surface of the coating-type waterproofing material layer using a mortar The coating type waterproofing material includes a primer for a polymer cement type coating film waterproofing material and a polymer cement type coating film waterproofing material, and the coating type waterproofing material layer has an elongation rate of 100 to 300% at room temperature. It is the construction method of the waterproof floor structure characterized by having.

The preferable aspect of the construction method of this invention is shown below. In the present invention, these embodiments can be appropriately combined.
(1) The step of providing a coating-type waterproof material layer includes a step of applying a polymer cement-based waterproofing material primer on a concrete floor and drying to provide a polymer cement-based waterproofing material primer layer, and the primer layer Applying a polymer cement-based waterproofing material prepared by kneading a hydraulic composition containing alumina cement and a polymer emulsion on the upper surface of the resin, and curing the coating to form a polymer cement-based waterproofing material layer. .
(2) The thickness of the polymer cement-based coating film waterproofing material layer is 0.1 to 2 mm.
(3) The hydraulic composition of the polymer cement-based waterproofing coating material contains alumina cement, and is further selected from inorganic powder, fine aggregate, setting modifier, fluidizing agent, thickener and antifoaming agent. Containing at least one kind.
(4) The polymer emulsion of the polymer cement-based coating film waterproofing material is an acrylic emulsion or an ethylene / vinyl acetate emulsion.
(5) The plate-like finishing material is one or more selected from natural stone, artificial stone, ceramic plate or ceramic tile, and the size of the plate-like finishing material is 30 to 600 mm in length. The length is 30 to 600 mm and the thickness is 3 to 20 mm.
(6) A hydraulic mortar is placed on the upper surface of the concrete floor and cured to provide a hydraulic mortar cured body layer, and an application type waterproof material is applied to the upper surface of the hydraulic mortar cured body layer to form an application type waterproof material layer. To provide.

  Moreover, this invention is a waterproof floor structure obtained by said construction method.

  By adopting the construction method of the waterproof floor structure of the present invention, it is a concrete structure built on the premise of long-term service, especially natural stone and ceramic plates, etc., which are highly required to maintain aesthetics and texture by washing with water To maintain the aesthetics and texture of finishing materials such as natural stone and porcelain, even if the concrete floor structure is finished with any plate finishing material, even if the concrete floor is cracked or cracked. Even if the water washing operation is frequently continued without any hesitation, a waterproof floor structure that does not cause water leakage in the lower floor can be obtained. As a result, it is possible to maintain the aesthetics and texture of a concrete floor finished with a plate-like finishing material such as natural stone or ceramic plate over a long period of time.

The waterproof floor structure of the present invention comprises a primer for a polymer cement-based coating film waterproofing material and a polymer cement-based coating film waterproofing material, and a coating type waterproofing material layer having an elongation of 100 to 300% at room temperature is applied to the top surface of the concrete floor. After that, it is characterized in that the surface of the concrete floor structure is finished by laying a plate-like finishing material such as natural stone or porcelain using mortar. Below, an example of embodiment is described based on Drawing 1 (1)-(5) about the waterproof floor structure of the present invention, and its construction method.

FIG. 1A is a partial cross-sectional view showing the concrete floor 11.
In the present invention, first, as shown in FIG. 1 (2), a hydraulic mortar is applied to the upper surface of the concrete floor 11 and cured to provide a hardened mortar hardened body layer 12, thereby adjusting the level of the upper surface of the concrete floor 11.
The hydraulic mortar is not particularly limited, and a commercially available premix mortar for repairing concrete, a mortar prepared by kneading cement, sand and water in the field can be used.

After the hydraulic mortar is cured, as shown in FIG. 1 (3), a polymer cement-based waterproofing primer is applied to the upper surface of the cured hydraulic mortar layer 12 and dried, and the polymer is applied to the upper surface of the primer layer 13. A cement-based waterproofing material is applied to form a polymer cement-based waterproofing layer 14 to form a coating-type waterproofing material layer.

Next, after the polymer cement-based coating film waterproof layer 14 is dried, a mortar 15 is applied to the top surface of the polymer cement-based coating film waterproof layer 14 and the back surface of the plate-like finish 16 as shown in FIG. The plate-like finishing material 16 is laid to be approximately evenly attached to a thickness of 2 mm to 10 mm, respectively, and the laying operation of the plate-like finishing material 16 is completed by adjusting the horizontal level as shown in FIG. .

Further, in the present invention, after the laying of the plate-like finishing material 16 is finished and the mortar is hardened, it is preferable to use various joint materials such as joint mortar to fill the gaps in the plate-like finishing material 16 and finish. .

Next, the coating type waterproof material used in the present invention will be described. The coating-type waterproof material of the present invention includes a primer for a polymer cement-based coating film waterproofing material and a polymer cement-based coating film waterproofing material.
The primer for polymer cement-based waterproof coating material used in the present invention is used to firmly bond a hydraulic mortar cured body layer and a polymer cement-based waterproof coating layer and for polymer cement-based waterproof coating material. It is used to prevent the water in the waterproof coating material from penetrating into the cured hydraulic mortar when it is constructed.
As a primer for a waterproofing material for polymer cement-based coating film, a commercially available primer mainly composed of an acrylic-styrene copolymer resin or an ethylene vinyl acetate copolymer can be used, and in particular, an acrylic-styrene copolymer resin as a main component. Can be suitably used.
The primer coating amount is preferably 80 to 240 g / m ² , and particularly preferably 120 to 180 g / m ² , in order to stably obtain good adhesive strength.
The drying time after application of the primer can be appropriately determined according to temperature conditions and ventilation conditions, and it is usually preferable to dry for 3 to 8 hours in summer and 5 to 12 hours in winter.

As the polymer cement-based waterproofing material used in the present invention, a slurry-like polymer cement-based waterproofing material containing a hydraulic composition containing alumina cement, a filler, a polymer emulsion and a thickener is preferably used. it can.
The polymer cement-based waterproof coating material used in the present invention can be applied to the upper surface of the hydraulic mortar cured body layer by spraying, glazing, or roller coating.

The hydraulic composition can contain one or two components selected from Portland cement and gypsum in addition to alumina cement.
The hydraulic composition preferably contains 5% by mass or more, more preferably 10% by mass or more, more preferably 20% by mass or more, and particularly preferably 30% by mass or more of alumina cement in 100% by mass of the hydraulic composition. It is preferable to use one.
In particular, it is preferable to use a hydraulic composition that contains 30 mass% or more of alumina cement in 100 mass% of the hydraulic composition because the elongation percentage of the cured product is excellent.

Alumina cement has a potentially rapid hardening property, and gives a cured product excellent in chemical resistance and fire resistance after curing. In addition, due to the presence of blast furnace slag having latent hydraulic properties, a decrease over time in the strength of the cured body, which is a drawback thereof, is also suppressed. Several types of alumina cements having different mineral compositions are known and commercially available, and all of them are monocalcium aluminate (CA). However, in terms of strength and colorability, there are many CA components and C _4. Alumina cement with a small amount of small components such as AF is preferred.

  As the Portland cement, portland cement such as ordinary Portland cement, early-strength Portland cement, ultra-high-strength Portland cement, white Portland cement, mixed cement such as blast furnace cement, fly ash cement, and silica cement can be used.

  As for gypsum, each gypsum such as anhydrous and semi-water can be used as one kind or a mixture of two or more kinds regardless of the kind. Gypsum is rapidly hardened and acts as a component for maintaining dimensional stability after curing.

As filler, sand such as quartz sand, river sand, sea sand, mountain sand, crushed sand, slag powder, fly ash, silica foam, limestone powder, talc, kaolin, alumina powder, titanium oxide, aluminum hydroxide, etc. may be used. One or two or more of these fillers can be used. In particular, when silica sand is used, it is preferable to use one having a particle size of 5-7.
In addition, the use of talc further improves the coating workability of the polymer cement-based waterproofing material, so that it is divided into 100% by mass of the hydraulic composition, preferably 5 to 30% by mass, more preferably It is preferable to mix | blend in the ratio of 10-25 mass%, Most preferably 12-20 mass%.

A known polymer emulsion can be used as the polymer emulsion.
Polymer emulsions include polyvinyl acetate emulsions, copolymer emulsions of ethylene and vinyl acetate, copolymers of ethylene, vinyl acetate and (meth) acrylic acid derivatives, and copolymers of ethylene and (meth) acrylic acid derivatives. Emulsion, Emulsion of poly (meth) acrylic acid derivative, Copolymer emulsion of styrene and (meth) acrylic acid derivative, Polychloroprene latex, Copolymer emulsion of vinyl acetate and vinyl chloride, Copolymer emulsion of styrene and butadiene , A copolymer emulsion of acrylonitrile and butadiene, an emulsion of a synthetic resin containing at least one kind of ethylene, styrene, vinyl acetate, a (meth) acrylic acid derivative, such as an emulsion of vinyl acetate and a (meth) acrylic acid derivative. Can . The (meth) acrylic acid derivative means an acid derivative such as acrylic acid and / or methacrylic acid or an ester thereof, and includes at least one or more of these components.

  The glass transition temperature of the polymer component contained in the polymer emulsion is not particularly limited, and a commercially available one can be used, but is preferably 0 ° C. or lower, more preferably −25 ° C. or lower, more preferably −25 ° C. to −50. Those having a range of ° C, particularly preferably a range of -33 ° C to -50 ° C are preferable because they have excellent characteristics even in a low-temperature environment, and the glass transition temperature containing a (meth) acrylic acid derivative is 0 ° C or lower. A polymer emulsion in the range of −25 ° C. or less, particularly preferably −25 ° C. to −50 ° C. can be preferably used because the elongation percentage of the cured product is excellent.

The (meth) acrylic acid derivative represents an acrylic acid derivative and a methacrylic acid derivative. For example, acrylic acid, methacrylic acid, methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, butyl acrylate, butyl methacrylate, 2-ethylhexyl acrylate 2-ethylhexyl methacrylate, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, acrylonitrile, methacrylonitrile, acrylamide, methacrylamide, and the like.
The polymer emulsion is preferably an acrylic emulsion produced by using one or more (meth) acrylic acid derivatives.

  As the polymer emulsion, one obtained by a known production method can be used. For example, in the presence of an emulsifier, a polymerization initiator is used to emulsify a polymerizable monomer that is a raw material for a synthetic resin in water or a hydrous solvent. It can be produced by a polymerization method or the like.

  As the emulsifier, known ones can be used, and examples thereof include anionic, nonionic, cationic or amphoteric surfactants and protective colloids such as polyvinyl alcohol.

  The polymer emulsion contains powdery synthetic resin particles that do not contain water or a water-containing solvent. When powdery synthetic resin particles are used, all components excluding water or the water-containing solvent can be combined into one package. It is convenient because it can be used just by adding water on site.

When a polymer emulsion containing water or a water-containing solvent is used, mortar can be obtained by kneading the polymer cement composition alone, and water is added as necessary for the purpose of adjusting the viscosity. be able to.
When powdered synthetic resin particles are used as a polymer emulsion, it is impossible to obtain a slurry-like mortar with the polymer cement composition alone, so a homogeneous slurry is produced by kneading the polymer cement composition and water. can do.

  In the emulsion excluding the powdered synthetic resin not containing water or a water-containing solvent, the solid content of the polymer contained in the emulsion can be appropriately selected, but 30 to 80 parts by mass is preferable in 100 parts by mass of the emulsion. -60 mass parts is more preferable.

  The polymer cement-based waterproof coating material is preferably 15 to 350 parts by mass, more preferably 20 to 330 parts by mass, and more preferably 22 to 300 parts by mass with respect to 100 parts by mass of the polymer solid content of the emulsion. More preferably, it contains 23 to 270 parts by mass, more preferably 80 to 250 parts by mass, and particularly preferably 150 to 230 parts by mass.

As the thickener to be blended with the polymer cement-based waterproofing film, water-soluble polymer such as polyether, urethane, and acrylic, cellulose, and protein can be used. Water-soluble polymer thickeners such as water-soluble polyurethane can be preferably used.
The addition amount of the thickener can be appropriately adjusted within a range not impairing the characteristics of the present invention, and is 0.05 to 1.0% by mass, and further 0.1 to 100% by mass of the hydraulic composition. It is preferable to contain -0.7 mass part, especially 0.2-0.5 mass part.

  The polymer cement-based waterproofing material can be blended with a setting retarder, a setting adjuster for setting accelerator, a fluidizing agent, an antifoaming agent and the like as long as the characteristics of the present invention are not impaired.

As an example of a method for producing a polymer cement-based waterproofing material, a predetermined amount of emulsion is measured in a stirring vessel, and a hydraulic composition, a filler and a thickener containing a predetermined amount of alumina cement while stirring the emulsion with a stirrer If necessary, add a setting retarder, a setting accelerator for setting accelerator, a fluidizing agent, an antifoaming agent, etc., stir and mix for several minutes, and then add water if necessary. A slurry-like composition having the following viscosity can be produced.
As an example of a method for producing a polymer cement-based waterproofing material, a predetermined amount of each component of the polymer cement-based waterproofing material is weighed into a container, and further, a setting retarder or a setting accelerator is added as necessary. Add a coagulation modifier, fluidizer, antifoaming agent, etc., stir and mix with a stirrer for several minutes, and then add water as needed to produce a slurry-like waterproof coating material with a predetermined viscosity can do.
Fillers, thickeners, additives, etc. to be blended into the hydraulic composition containing alumina cement may be added singly or may be added in advance mixed with other several kinds, the order of addition Is not particularly selected. Moreover, what has a stirring function, such as a general solid-liquid stirrer, can be used for a stirrer without a problem.
When adding water, it is preferable to add so that a homogeneous slurry may be obtained so that a component may not isolate | separate.

The polymer cement-based waterproof coating material used in the present invention is applied to the surface of a hydraulic mortar cured body layer that has been previously applied and cured by a general method using a roller, a trowel, and spraying (spray etc.). It can be used to obtain a composite concrete floor structure including a cured body of a polymer cement-based coating film waterproof material and a hydraulic mortar cured body layer.
After the polymer cement-based waterproofing membrane is dried, the same operation is repeated to form a multi-layered polymer cement-based waterproofing material to obtain a structure having higher waterproof performance.

The coating type waterproofing material layer comprising the primer for the polymer cement-based waterproofing material and the polymer cement-based waterproofing material of the present invention retains excellent waterproof performance even when cracks or cracks occur in the ground concrete. It is preferable to have a high elongation.
The elongation rate of the coating type waterproof material layer of the present invention is preferably 100 to 300% at room temperature, more preferably 120 to 280%, and particularly preferably 150 to 250% at room temperature. Having an elongation rate is preferable because excellent waterproof performance can be maintained even when cracks or cracks occur in the ground concrete.

In the present invention, an adhesive mortar is used to firmly bond the polymer cement-based waterproofing film cured material layer provided on the upper surface of the hydraulic mortar cured material layer and a plate-like finishing material such as stone or tile.
Affixing mortar is almost uniformly applied to the upper surface of the cured polymer cement coating waterproof material layer to a thickness of 4 mm to 20 mm, and laying a plate-like finishing material such as stone or tile, or polymer cement coating It is possible to lay a plate-like finishing material such as stone or tile on the upper surface of the cured waterproof material layer and the back surface of the plate-like finishing material such as stone or tile almost uniformly. Especially, it is particularly preferable to apply to the upper surface of the polymer cement-based coating film waterproofing material hardened body layer and the back surface of the plate-like finishing material, because voids are unlikely to remain on the back surface of the plate-like finishing material, and damage due to falling objects can be avoided. Particularly preferred.
The pasting mortar used in the present invention can be appropriately selected from commercially available stone tensioning mortars, tile tensioning mortars, or stone or tile tensioning polymer cement mortars.

In the present invention, a plate-like finishing material such as stone or tile is used as the surface finishing material of the concrete floor structure.
The stone material is not particularly limited, and is a plate formed by cutting a natural stone such as marble or granite to a length of 30 to 600 mm, a length of 30 to 600 mm, and a stone plate thickness of 3 to 20 mm. These stone materials can be appropriately selected and used.
The tiles are not particularly limited in terms of the production method and type, and ceramic tiles, ceramic plates, etc. can be suitably used. The size of the tiles is 30-600 mm in length, the length of the side Having a thickness of 30 to 600 mm and a tile thickness of 3 to 20 mm can be appropriately selected and used.

In the present invention, it is preferable to fill a joint portion with a cement-based joint material, a polymer cement-based joint material, a resin-based joint material, etc. after laying stone or tile.
The joint material is not particularly limited, and commercially available joint materials can be appropriately selected and used.

The waterproof floor structure of the present invention comprises a primer for a polymer cement-based coating film waterproofing material and a polymer cement-based coating film waterproofing material, and a coating type waterproofing material layer having an elongation of 100 to 300% at room temperature is applied to the top surface of the concrete floor. After that, it is characterized in that the surface of the concrete floor structure is finished by laying a plate-like finishing material such as natural stone or porcelain using mortar. Below, an example of embodiment is described based on Drawing 2 (1)-(5) about a particularly preferred mode about a waterproof floor structure of the present invention and its construction method.

FIG. 2 (1) is a partial cross-sectional view showing the concrete floor 11.
In the present invention, a hydraulic mortar is applied to the upper surface of the concrete floor and cured to provide a hardened mortar hardened body layer, thereby adjusting the level of the upper surface of the concrete floor.
In the present invention, as the hydraulic mortar, it is preferable to use a self-leveling material containing alumina cement capable of easily and quickly forming a cured body having a high level level.
When high levelness is obtained on the upper surface of the concrete floor using the self-leveling material, as shown in FIG. 2 (2), the primer 17 for the self-leveling material is formed on the upper surface of the concrete floor 11 having unevenness (small unevenness) or a slight inclination. Install.
Next, after the self-leveling material primer 17 is dried and formed into a film, the self-leveling material slurry is cast on the upper surface thereof to form the cured self-leveling material slurry 18.

  Preparation and construction of the self-leveling material slurry is carried in the form of a bag into the construction site, and a predetermined amount is used in the vicinity of the construction site using a mixer such as an on-site mixing / kneading device or hand mixer. A water slurry and a self-leveling material can be mixed to prepare a slurry.

After the self-leveling material slurry is hardened, as shown in FIG. 2 (3), a primer for a polymer cement-based waterproofing coating material is applied to the upper surface of the self-leveling material slurry cured body layer 18 and dried. A polymer cement-based waterproof membrane material 14 is applied to provide a polymer cement-based waterproof membrane layer 14.

Next, after the polymer cement-based waterproofing material layer 14 is dried, it is attached to the upper surface of the waterproofing material layer and the back surface of the plate-like finishing material 16 such as stone or tile as shown in FIG. Each of the mortars 15 is thinly and evenly attached to a thickness of 1 mm to 5 mm, the plate-like finishing material 16 is laid, and the horizontal level property is finely adjusted as shown in FIG. Laying work is completed.
In the present invention, as a hydraulic mortar, by using a self-leveling material containing alumina cement that can easily and quickly form a cured body having a high horizontal level, an underlayer for laying the plate-like finishing material 16 is used. Since it has an excellent horizontal level property, in the work of laying the plate-like finishing material 16, after temporarily laying the finishing material (stone or tile), it is fine to ensure the horizontal level property of the plate-like finishing material 16. It is possible to concentrate only on the adjustment, and it is possible to easily ensure an excellent horizontal level property on the entire laying surface of the plate-like finishing material 16 while eliminating troublesome work relating to the horizontal level adjustment.

  Next, the self-leveling material primer and the self-leveling material that can be suitably used when the self-leveling material is used as the hydraulic mortar in the construction method of the waterproof floor structure of the present invention will be described.

The primer for the self-leveling material used in the present invention adheres the concrete floor and the cured self-leveling material slurry firmly, and when the self-leveling material slurry is placed, moisture in the slurry is applied to the concrete floor. Used to prevent permeation.

  As a primer for a self-leveling material, a commercially available primer mainly composed of an acrylic-styrene copolymer resin or an ethylene vinyl acetate copolymer can be used, and a primer mainly composed of an acrylic-styrene copolymer resin is preferably used. it can.

  Moreover, what is preferable as a primer for a self-leveling material is an acrylic resin-based emulsion, and the acrylic resin-based emulsion comprises 9 to 35% by mass of a component selected from (1) methyl (meth) acrylate and ethyl (meth) acrylate, (2) A monomer composition comprising 50 to 80% by mass of an alkyl (meth) acrylate having an alkyl group having 4 to 10 carbon atoms and (3) 5 to 10% by mass of a (meth) acrylate having an OH group. Is obtained from The acrylic resin emulsion is obtained from a monomer composition containing less than 0.6% by mass of a component selected from (4) (meth) acrylate having a COOH group in addition to the above (1) to (3). It is preferable.

The primer coating amount is preferably 30 to 120 g / m ^2, and preferably 45 to 90 g / m ² in order to stably obtain good adhesive strength as the resin solid content contained in the primer. Is more preferable. The primer application operation can be performed by applying the above-described application amount in a single process, and the primer can be applied in two to three operations.

  After the primer application, the primer can be dried by a drying time appropriately selected according to temperature conditions and ventilation conditions. The drying time is usually preferably 3 to 8 hours in summer and 5 to 12 hours in winter.

In the present invention, a self-leveling material that is excellent in fast curing and horizontal level properties is selected and used.
The self-leveling material used in the present invention uses a self-leveling material containing a hydraulic component containing alumina cement and a fine aggregate in order to realize excellent construction efficiency.
Furthermore, as the self-leveling material, a self-leveling material containing a hydraulic component made of alumina cement, Portland cement and gypsum and resin powder can be suitably used.

  Several types of alumina cement having different mineral compositions are known and commercially available, but the main component is monocalcium aluminate (CA), and commercially available products can be used regardless of the type.

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

As for gypsum, each gypsum such as anhydrous gypsum, hemihydrate gypsum, and dihydrate gypsum can be used as one type or a mixture of two or more types regardless of the type.
Gypsum functions as a component that retains dimensional stability after the slurry obtained by kneading the self-flowing hydraulic composition and water is cured.

In the present invention, it is preferable to use a hydraulic component made of alumina cement, Portland cement and gypsum as the hydraulic component.
The hydraulic component (the total of alumina cement, Portland cement and gypsum is 100% by mass) is preferably composed of 20 to 80% by mass of alumina cement, 5 to 70% by mass of Portland cement and 5 to 45% by mass of gypsum. More preferably, the composition consists of 25 to 70% by weight of alumina cement, 10 to 60% by weight of Portland cement and 10 to 40% by weight of gypsum, more preferably 30 to 60% by weight of alumina cement, 20 to 50% by weight of Portland cement and gypsum. By using a composition comprising 15 to 35% by mass, particularly preferably 40 to 50% by mass of alumina cement, 30 to 40% by mass of Portland cement, and 20 to 30% by mass of gypsum, it has rapid hardening, low shrinkage or low Because it is easy to obtain a cured product that is expandable and has little volume change during curing Masui.

As the fine aggregate, an aggregate having a particle size of 2 mm or less, preferably an aggregate having a particle size of 0.075 to 1.5 mm, more preferably an aggregate having a particle size of 0.88 to 1 mm, particularly preferably 0.1 to 0.1 mm. It is preferable that the main component is an aggregate of 0.6 mm.
Fine aggregates include silica sand, river sand, sea sand, mountain sand, crushed sand, etc., alumina clinker, silica powder, clay mineral, waste FCC catalyst, inorganic materials such as limestone, crushed urethane, EVA foam, foaming resin A resin pulverized product such as can be used.
In particular, as fine aggregates, sand such as quartz sand, river sand, sea sand, mountain sand, crushed sand, waste FCC catalyst, quartz powder, alumina clinker and the like can be preferably used.
The particle size of the fine aggregate is measured using several sieves having different nominal dimensions as defined in JIS Z 8801.
The fine aggregate is preferably in the range of 30 to 500 parts by mass, more preferably 40 to 400 parts by mass, still more preferably 60 to 300 parts by mass, and particularly preferably 80 to 150 parts by mass with respect to 100 parts by mass of the hydraulic component. Is preferred.

The self-leveling material used in the method for constructing a concrete floor structure according to the present invention has the effect of preventing dry cracks in the cured body layer and greatly reducing the air permeability of the cured body, and the cured body has a higher tensile strength. Furthermore, it is preferable to use a resin powder because a high adhesive strength can be obtained between the pasting mortar and the concrete base used for pasting the plate-like finishing material.
In the self-leveling material used in the present invention, it is preferable to premix and supply the constituent components since the blending ratio of the constituent components can be strictly controlled. Therefore, the resin powder to be used is preferably a powdered re-emulsified resin powder.
The resin powder has the effect of improving the resistance to the occurrence of cracks in the process where the shrinkage stress generated by drying leads to the occurrence of cracks, and in particular, the effect of densifying the cured body structure and the surface of the cured body to increase the adhesive strength.
The resin powder is not particularly limited in its production method such as a resin pulverization method, and those produced by a known production method can be used. As the resin powder, an anti-blocking agent is mainly used. What has adhered to the surface of the resin powder can be used.
As the resin powder, it is preferable to use a re-emulsification type resin powder obtained by removing the solvent and drying the aqueous polymer dispersion by a method such as spraying or freeze drying.
As the powder resin, polyacrylic ester resin-based, styrene-butadiene synthetic rubber-based, or vinyl acetate / berobaacrylic copolymer-based ones can be used. Resin powder or acrylic acid ester-methacrylic acid ester copolymer type re-emulsifying resin powder can be suitably used.
As the particle size of the resin powder, those having a residue on the 315 μm sieve of 3% or less, a residue on the 300 μm sieve of 3% or less, and particularly a residue of 300% on the sieve of 2% or less can be preferably used.
The resin powder is preferably 0.5 to 20 parts by mass, more preferably 1 to 15 parts by mass, further preferably 2 to 10 parts by mass, and particularly preferably 3 to 8 parts by mass with respect to 100 parts by mass of the hydraulic component. Can be used.
When the ratio of powder resin is larger than the said range, while the viscosity of the slurry obtained by adding water becomes high and workability falls, there exists a tendency for the compressive strength of a hardening body to fall. Moreover, when smaller than the said range, there exists a tendency for the improvement effect of the tensile strength of a hardening body, and the reduction effect of air permeability to become small.

The self-leveling material used in the method for constructing a concrete floor structure of the present invention includes a hydraulic component composed of alumina cement, Portland cement and gypsum, fine aggregate and resin powder, and further includes an inorganic powder, a setting regulator, and a fluidizing agent. It is preferable to contain a thickener and an antifoaming agent.

The self-leveling material used in the present invention preferably contains at least one inorganic component selected from blast furnace slag fine powder, fly ash, silica fume, calcium carbonate fine powder and dolomite fine powder, and particularly blast furnace slag fine powder. By including, the crack resistance of the hardening body by drying shrinkage | contraction can be improved.
In the self-leveling material, the added amount of the inorganic component is preferably 10 to 200 parts by mass, more preferably 20 to 150 parts by mass, still more preferably 30 to 130 parts by mass, particularly preferably 100 parts by mass of the hydraulic component. It is preferable to set it as 40-100 mass parts.

In the self-leveling material, the addition amount of the blast furnace slag fine powder is preferably 10 to 200 parts by weight, more preferably 20 to 150 parts by weight, even more preferably 30 to 130 parts by weight, particularly 100 parts by weight of the hydraulic component. Preferably it is 40-100 mass parts. If the addition amount of the blast furnace slag fine powder is too small, the drying shrinkage of the cured body increases, and if it is too large, the initial strength may be lowered.
As the blast furnace slag fine powder, those having a brain specific surface area of 3000 cm ² / g or more as defined in JIS A 6206 can be used.

The self-leveling material uses a fluidizing agent (water reducing agent such as a high-performance water reducing agent) that ensures suitable fluidity while suppressing material separation.
Since the expression strength of alumina cement, which is a hydraulic component, is greatly affected by the water / cement ratio, it is particularly preferable to reduce the water / hydraulic component ratio by using a fluidizing agent having a water reducing effect.

  Commercially available fluidizing agents such as formaldehyde condensates of melamine sulfonic acid, casein, calcium caseinate, polyethers, polyether polycarboxylic acids, etc., which have a water reducing effect, are used regardless of the type. In particular, commercially available fluidizing agents such as polyether-based polycarboxylic acids such as polyether-based are preferable.

  The fluidizing agent can be appropriately added in a range that does not impair the characteristics, depending on the hydraulic component used, and is preferably 0.01 to 2.0 parts by mass, more preferably 100 parts by mass of the hydraulic component. Can be blended in an amount of 0.02 to 1.0 parts by mass, particularly preferably 0.05 to 0.5 parts by mass. If the amount added is too small, no suitable effects (excellent fluidity and high cured product strength) will be exhibited, and if the amount added is too large, an effect commensurate with the amount added cannot be expected and it is merely uneconomical. In some cases, the viscosity is increased, and the amount of kneading water for obtaining the required fluidity increases to deteriorate the strength properties.

  Depending on the hydraulic component used and the constituents of the self-leveling material, the setting modifier can be added as appropriate within the range that does not impair the properties, and the components, addition amount and mixing ratio of the setting retarder and setting accelerator can be adjusted. It can be selected as appropriate to adjust the pot life, fast-curing property and quick-drying property of the self-leveling material, and it is very easy to use as a self-leveling material.

  As the setting retarder, a known setting retarder can be used. Examples of setting retarders include inorganic sodium salts such as sodium sulfate, sodium bicarbonate, sodium tartrate (monosodium tartrate, disodium tartrate), sodium malate, sodium citrates, sodium gluconate and other organic acids. Sodium salts such as sodium salts, oxycarboxylic acids, and the like can be used alone or in combination of two or more components.

Oxycarboxylic acids include oxycarboxylic acids and their salts.
Examples of the oxycarboxylic acid include aliphatic oxyacids such as citric acid, gluconic acid, tartaric acid, glycolic acid, lactic acid, hydroacrylic acid, α-oxybutyric acid, glyceric acid, tartronic acid, malic acid, salicylic acid, and m-oxybenzoic acid. Examples thereof include aromatic oxyacids such as acid, p-oxybenzoic acid, gallic acid, mandelic acid and tropic acid.
Examples of oxycarboxylic acid salts include alkali metal salts of oxycarboxylic acids (specifically, sodium salts, potassium salts, etc.), alkaline earth metal salts (specifically, calcium salts, barium salts, magnesium salts, etc.), etc. Can be mentioned.
In particular, sodium bicarbonate and disodium tartrate are preferable from the standpoints of setting delay effect, availability, and cost.

When one or more kinds of setting retarders are used, the amount of each setting retarder added is preferably 0.01 to 1.5 parts by mass, more preferably 100 parts by mass with respect to the hydraulic component. Is preferably 0.1 to 1.2 parts by weight, more preferably 0.2 to 1.1 parts by weight, and particularly preferably 0.25 to 1.0 parts by weight. It is preferable because the working time can be secured.

As a setting accelerator, the well-known component which accelerates | stimulates can be used, for example, lithium salt which has a setting acceleration effect can be used suitably.
Examples of lithium salts include inorganic lithium salts such as lithium carbonate, lithium chloride, lithium sulfate, lithium nitrate, and lithium hydroxide, and lithium such as organic acid lithium salts such as lithium acetate, lithium tartrate, lithium malate, and lithium citrate. Salt can be used. In particular, lithium carbonate is preferable from the viewpoints of the setting acceleration effect, availability, and cost.

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

  The setting accelerator is preferably 0.01 to 1 part by weight, more preferably 0.01 to 0.5 part by weight, and still more preferably 0.02 to 0.3 part, with respect to 100 parts by weight of the hydraulic component. It is preferable to use in the range of part by mass, particularly preferably in the range of 0.02 to 0.2 part by mass, since suitable quick hardening and quick drying can be obtained after securing the pot life of the self-leveling material.

The thickener includes hydroxyethylmethylcellulose, and can be used in combination with other cellulose-based, protein-based, latex-based, and water-soluble polymer-based thickeners other than hydroxyethylmethylcellulose.
The addition amount of the thickener can be added within a range not impairing the characteristics of the present invention, and is preferably 0.001 to 2 parts by mass, more preferably 0.005 to 100 parts by mass of the hydraulic component. It is preferable to include 1.5 parts by mass, more preferably 0.01 to 1 part by mass, particularly 0.05 to 0.8 parts by mass. When the addition amount of the thickener increases, the viscosity of the slurry may increase to cause a decrease in fluidity. Therefore, it is preferably used within the above preferable range.

  Using a thickener and an antifoaming agent together has a favorable effect on suppressing the separation of aggregates such as hydraulic components and fine aggregates, suppressing the generation of bubbles, and improving the surface of the cured body. It is preferable for improving the properties of the cured product.

As the antifoaming agent, known substances such as silicon-based, alcohol-based and polyether-based synthetic substances or plant-derived natural substances can be used alone or in combination of two or more.
The addition amount of the antifoaming agent can be added within a range that does not impair the characteristics of the present invention. When one type of antifoaming agent is used, preferably 0.001 to 3 parts relative to 100 parts by mass of the hydraulic component. 0.0 part by mass, more preferably 0.005 to 2.5 parts by mass, more preferably 0.01 to 2.0 parts by mass, and particularly preferably 0.02 to 1.8 parts by mass. The addition amount of the antifoaming agent is preferably within the above range because a suitable antifoaming effect is recognized.
In addition, when two or more kinds of antifoaming agents are used in combination, the addition amount of the antifoaming agent is preferably 0.001 to 2 parts by mass with respect to 100 parts by mass of the hydraulic component. More preferably, it is 0.005 to 1.5 parts by mass, more preferably 0.01 to 1.3 parts by mass, and particularly preferably 0.02 to 1.2 parts by mass. The addition amount of the antifoaming agent is preferably within the above range because a suitable antifoaming effect is recognized.

  In the case of constituting a self-leveling material, particularly suitable component constitution is a hydraulic component composed of alumina cement, Portland cement and gypsum, fine aggregate such as silica sand, powder resin, inorganic component, fluidizing agent, thickener, It contains an antifoaming agent and a setting modifier.

  A hydraulic component and fine aggregate, resin powder, inorganic component, fluidizing agent, thickener, antifoaming agent, and coagulant adjusting agent can be mixed in a mixer to obtain a premix powder of a self-leveling material. .

  The pre-mix powder of the self-leveling material can be mixed and stirred with a predetermined amount of water to produce a slurry (mortar) having a self-leveling property in the form of a slurry. A cured product can be obtained.

  In a site where the construction area is large, it is preferable to use a self-leveling material slurry preparation / construction truck having a tank for storing a self-leveling material as shown in, for example, JP-A-2007-326352 (FIG. 1). Since the slurry of the leveling material can be continuously prepared and continuously supplied to the construction site for construction, a more excellent self-leveling material cured body can be obtained from the viewpoint of construction efficiency and construction quality.

The construction area where the self-leveling material slurry preparation and construction truck can be suitably applied is preferably a site having a construction area of 200 m ² or more, more preferably a site having a construction area of 400 m ² or more, particularly preferably 500 m ² or more. This site has a construction area of When applying a self-leveling material slurry to such a large area site, the use of the truck makes the construction efficiency high, greatly increasing the transition period to the construction of the plate finishing material, which is the next process. It can be shortened.

Self-leveling material can be mixed and stirred with water to produce a slurry (mortar). By adjusting the amount of water added, the fluidity of the slurry (mortar), pot life, material separability, slurry The strength of the (mortar) cured product can be adjusted.
The self-leveling material slurry used in the present invention has a mass ratio (W / C) of the self-leveling material (C) and water (W) of preferably 0.16 to 0.28, and more preferably 0.18 to 0.28. It is preferable to blend and knead so as to be in the range of 0.26, more preferably in the range of 0.19 to 0.25, particularly preferably in the range of 0.20 to 0.24.

  The self-leveling material used in the present invention has a flow value of a slurry (mortar) having a self-leveling property (self-fluidity) prepared by mixing with water, preferably 190 to 270 mm, more preferably 200 to 260 mm, particularly It is preferable that the thickness is preferably adjusted to 210 to 255 mm for the reason that it is easy to obtain a hardened product surface with high ease of construction and high smoothness.

The construction thickness of the self-leveling material slurry depends on the unevenness of the concrete floor surface and the slope of the concrete floor surface, and can be set appropriately for each construction site, and the top surface of the most convex part of the floor slab surface The construction thickness is preferably in the range of 2 mm to 70 mm, more preferably in the range of 2.5 mm to 50 mm, more preferably in the range of 3 mm to 40 mm, and particularly preferably 3. Pouring is preferably performed in the range of 5 mm to 30 mm.

When thinning a self-leveling material slurry to a height of 2 mm to 5 mm with reference to the top surface of the most convex part of the floor slab surface, the slurry is evenly distributed using a spike roller, a dragonfly, a trowel, etc. while pouring the slurry. It is preferable to form the slurry at a high horizontal level with a thin layer over the entire floor slab.

When the self-leveling material slurry is applied thickly to a height of 5 mm to 70 mm on the basis of the uppermost convex part upper surface of the floor slab surface, the slurry is spread evenly using a dragonfly while pouring the slurry. It is preferable to perform an auxiliary operation to form the slurry at a high level in a thick layer over the entire floor slab.

The self-leveling material slurry used in the present invention has sufficient pot life (handling time) to ensure good workability.
The pot life of the self-leveling material slurry is preferably 60 minutes from the slurry preparation, more preferably 50 minutes, and particularly preferably 40 minutes.

Self-leveling material slurry, depending on the temperature and humidity conditions at the construction site, starts curing when it exceeds 1.5 hours after the completion of construction, and the surface hardness of the cured body increases and cures as curing progresses. The moisture content on the body surface decreases.

  The shore hardness of the surface of the cured self-leveling material slurry is preferably 10 or more after 2 hours, more preferably 15 or more after 2 hours, more preferably 20 or more after 2 hours, particularly preferably 2 from the placement (construction) of the slurry. It develops a Shore hardness of 25 or more after hours.

Further, the Shore hardness of the surface of the cured self-leveling material slurry is preferably 50 or more after 6 hours, more preferably 50 or more after 4 hours, more preferably 50 or more after 3.5 hours from the placement (construction) of the slurry, Particularly preferably, a Shore hardness of 50 or more is developed after 3 hours.
The self-leveling material slurry cured body can quickly shift to the laying process of the plate-like finishing material using the pasting mortar, which is the next process, by expressing the excellent Shore hardness as described above in a short time. Become.

The level of the self-leveling material slurry cured body is preferably 5.0 mm in terms of horizontal level (difference between the highest and lowest portions of the surface of the cured slurry body) when the surface of the concrete floor upper surface is 15 m ^2. Hereinafter, it is more preferable that it is 4.5 mm or less, More preferably, it is 4.0 mm or less, Especially preferably, it is 3.5 mm or less. Since the surface of the hardened slurry has such a high horizontal level, the work of laying a plate-like finish on the upper surface of the self-leveling material slurry hardened has become easy and efficient. The horizontal level of the surface of the plate-like finishing material on the entire floor surface on which the material is laid and finished can be kept constant.

When applying mortar to the upper surface of the cured self-leveling material slurry or the back surface of the plate-like finishing material, the thickness of the application of the mortar is preferably 2 to 20 mm, more preferably 3 to 14 mm. In particular, it is preferable to apply a uniform thickness in the range of 4 to 10 mm.

Moreover, when apply | coating a pasting mortar to the upper surface of a self-leveling material slurry hardening body, and the back surface of a plate-shaped finishing material, the thickness of the pasting of a pasting mortar becomes like this. Preferably it is a thickness of 1-10 mm, More preferably, it is 1.5. It is preferable to apply a uniform thickness within a range of ˜7 mm, particularly preferably 3 to 5 mm.

In particular, the adhesive mortar should be securely attached to the back surface of the plate-like finishing material, air should not remain on the back surface of the plate-like finishing material, and the hardened self-leveling material slurry and the plate-like finishing material can be firmly integrated. From the above, it is particularly preferable to apply a mortar to the upper surface of the cured self-leveling material slurry and the back surface of the plate-like finishing material.

Further, in the present invention, since the base layer for laying the plate-like finishing material using the tensioning mortar is formed using the self-leveling material slurry that can obtain a high horizontal level, the tensioning mortar layer can be thinned, The horizontal level adjustment of the plate finish is fine, and not only complicated work related to the horizontal level adjustment is eliminated and high work efficiency is obtained, but also the entire floor surface on which the plate finish is laid is high. Sex can be obtained.

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

(Characteristic evaluation method)
(1) Fluidity evaluation of self-leveling material slurry:
・ Measurement method of flow value:
Measured according to JASS 15M-103. A plastic pipe (internal volume 100 ml) with an inner diameter of 50 mm and a height of 51 mm is placed on a 5 mm thick glass sheet, and after mixing the kneaded self-leveling material slurry up to the upper end of the resin pipe, the pipe is vertically oriented. Pull up. After the spread of the slurry stops, the diameters in two directions at right angles are measured, and the average value is taken as the flow value to evaluate the fluidity of the slurry.
-SL value measurement method:
The SL value is measured using the SL measuring instrument shown in FIG. 4 and 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 to fill a predetermined amount of slurry immediately after kneading. To mold. Immediately after molding, the weir plate is pulled up, and after the slurry flow is stopped, the distance from the gauge point (weir plate installation part) to the shortest part of the slurry flow is measured, and the value (SL value) is set to L0. Then, the time for 200 mm is measured, and the measurement time is defined as the SL flow rate (L0) (second / 200 mm).
Similarly, after 20 or 30 minutes after molding, the weir plate is pulled up, and after the flow of the slurry is stopped, the distance from the gauge point (the installation portion of the weir plate) to the shortest portion of the slurry flow is measured, and the value (SL value) ) Is set to L20 or L30, the time for flowing 200 mm from the weir plate is measured, and the measurement time is set to SL flow velocity (L20, L30) (second / 200 mm), respectively.
・ Evaluation conditions are 20 ° C and 65% humidity.

(2) Evaluation of surface characteristics of self-leveling material slurry cured body:
・ Shore hardness measurement method:
At a predetermined elapsed time after pouring the self-leveling material slurry, the cured surface is pressed perpendicularly to any 3 to 5 locations using a spring type hardness tester type D (manufactured by Ueshima Seisakusho). The average value of the readings of the spring type hardness tester type D gauge at that time is regarded as the Shore hardness of the time, and the surface hardness is evaluated.
・ Scratch strength measurement method:
2cm along the ruler at any 3-5 locations using a scratch tester (Japanese Architectural Institute of Japan, Japan Painted Floor Industry Association certified product) at a predetermined elapsed time after casting the self-leveling material slurry. A scratch of about 10 cm in length is made at a speed of / sec. The scratch width at a load of 1.0 kg is measured using a crack scale and a magnifying glass, and the scratch strength as the time is evaluated as the surface hardness.
-Hardened surface properties:
The surface of the hardened slurry was cured by pouring the self-leveling material slurry into a 13 cm x 19 cm resin mold at a thickness of 10 mm, and visually checking for pulverization and fine irregularities at 24 hours of age. It was evaluated by observing. Evaluation is as follows.
Evaluation conditions are performed in an environment of a temperature of 20 ° C. and a humidity of 65%.
○: None, ×: Present

(3) Evaluation of compressive strength (N / mm ² ) and bending strength (N / mm ² ) of the cured self-leveling material slurry:
・ The produced slurry is packed in a 4 × 4 × 16 cm form shown in JIS R-5201, cured in air at a temperature of 20 ° C. and a humidity of 65% for 24 hours, demolded, and further in the air. Additional molding is performed for a predetermined period (7 days, 28 days) to obtain a molded body. The molded body is measured according to the method described in JIS / R-5201.

(Materials used): The following materials were used.
1) Primer for self-leveling material: U Primer Q, manufactured by Ube Industries
2) Self-leveling material: A self-leveling material in which the following raw materials were mixed at the blending ratio shown in Table 1 was used.
Alumina cement: Fondge, manufactured by Kerneos, Blaine specific surface area of 3100 cm ² / g.
Portland cement: Hayashi Cement, Ube Mitsubishi Cement Co., Blaine specific surface area 4500 cm ² / g.
Gypsum: Type ^II anhydrous gypsum, manufactured by Central Glass Co., Ltd., Blaine specific surface area of 3460 cm ² / g.
-Fine aggregate: Silica sand: No. 6 silica sand.
-Inorganic component: Blast furnace slag fine powder, rebirth, manufactured by Chiba Rebirth, Blaine specific surface area 4400 cm ² / g.
Resin powder: vinyl acetate / versaic acid vinyl ester / acrylic acid ester copolymer, DM2071P manufactured by Nichigo Movinyl Co., Ltd.
-Setting adjuster a: Sodium bicarbonate, manufactured by Tosoh Corporation.
-Setting adjuster b: L-sodium tartrate, manufactured by Fuso Chemical Industries.
-Setting adjuster c: Lithium carbonate, manufactured by Honjo Chemical Co., Ltd.
-Fluidizer: Polycarboxylic acid fluidizer, manufactured by Kao Corporation.
-Thickener: Hydroxyethyl methylcellulose-based thickener, Marporose MX-30000, manufactured by Matsumoto Yushi Co., Ltd.
Antifoaming agent a: a polyether antifoaming agent, manufactured by San Nopco.
-Antifoaming agent b: Polyether type antifoaming agent, made by ADEKA.
3) Pasting mortar and pasting mortar: Nippon Kasei Co., Ltd. NS tile cement, T-3.
4) Plate finishing material / stone plate: natural marble, dimensions: 400 × 400 × 10 mm, commercially available product.

(Preparation of slurry for self-leveling material)
The self-leveling material and water prepared at the blending ratio shown in Table 1 under the conditions of room temperature of 20 ° C. and relative humidity of 65%, and in Example 1, the ratio of 22 parts by mass of water to 100 parts by mass of the self-leveling material. In Example 1, Reference Example 1 is blended at a ratio of 26 parts by mass of water with respect to 100 parts by mass of the self-leveling material, and kneaded for 3 minutes using a chemistor with a rotation speed of 650 rpm to prepare a self-leveling material slurry. did.

[Example 1, Reference Example 1]
A self-leveling material slurry was prepared using a self-leveling material containing the components shown in Table 1. Table 2 shows the measurement results of the fluidity (flow value, SL value) of the slurry.

Under conditions of room temperature of 20 ° C and relative humidity of 65%, a 3 times solution of a primer for self-leveling material (water with respect to 150 parts by weight of the stock solution) on a 300 mm x 300 mm x 60 mm concrete flat plate specified for JIS A5304 concrete flat plate for paving. (Diluted at a rate of 300 parts by mass) was applied (450 g / m ² ) and dried. After the primer film formation, the self-leveling material slurry was poured and cured to a working thickness of 10 mm to obtain a self-leveling material slurry cured body layer. Table 3 shows the results of evaluating the surface hardness (Shore hardness), scratch strength, and surface properties of the cured slurry.

Moreover, the self-leveling material slurry of the above two types was packed in a 4 × 4 × 16 cm mold shown in JIS R-5201 to obtain a specimen for measuring compressive strength and bending strength. . Table 3 shows the results of evaluating the compressive strength and bending strength of the cured slurry.

[Example 2]
After a foundation layer is formed using a self-leveling material on the 3m x 5m concrete floor shown in Fig. 3, a construction experiment is conducted in which a stone board (400 x 400 x 10mm) is pasted with a pasting mortar. The horizontal level property of the slab finished concrete structure was evaluated.
First, on the concrete floor (3m x 5m) before the construction of the self-leveling material slurry, a laser level meter is placed at the center (base point A), and the laser level (reference height) of the laser level meter placed at the base point A ) And 14 floor surfaces were measured. As a result, as shown in FIG. 3A, the maximum height difference at 14 measurement points was 15 mm.
Next, a weir 30 mm in height is provided around the concrete floor (3 m × 5 m) using a sponge tape, applied with a primer for self-leveling material, dried, and then the self-leveling material shown in Example 1 The slurry prepared using was cast and applied to a thickness of 10 mm at the thinnest construction thickness and cured. 2 hours after slurry application, in order to evaluate the horizontal level property of the self-leveling material slurry cured body, a laser level meter was placed at the center (base point B) and the laser level meter placed at the base point B as before. The distance between the laser level (reference height) and the 14 floor surfaces was measured. As a result, as shown in FIG. 3B, the maximum height difference at 14 measurement points was 3 mm.

A preferred embodiment of the waterproof floor structure of the present invention is that a hydraulic mortar is applied to the upper surface of the concrete floor and cured to provide a hardened mortar hardened body layer, and the leveling of the upper surface of the concrete floor is adjusted. After providing a coating type waterproofing material layer having a primer for the material and a polymer cement-based coating film waterproofing material and having an elongation of 100 to 300% at room temperature on the upper surface of the hardened hydraulic mortar layer, the adhesive mortar is used. The surface of the concrete floor structure is finished by laying plate-like finishing materials such as natural stone and ceramic plates.

When a hardened hydraulic mortar layer is provided on the upper surface of the concrete floor, it is implemented by using a self-leveling material containing alumina cement that can easily and quickly form a hardened body having a high horizontal level as the hydraulic mortar. Concrete foundations having excellent horizontal level properties as shown in Example 1 and Example 2 can be quickly formed.

In the present invention, the upper surface of the concrete base formed using the self-leveling material as described above includes a primer for a polymer cement-based coating film waterproofing material and a polymer cement-based coating film waterproofing material, and is 100 to 300% at room temperature. A coating type waterproof material layer with elongation rate is provided on the upper surface of the hardened hydraulic mortar layer, and by using plaster mortar to lay plate-like finishing materials such as natural stone and ceramic plates, high construction efficiency and excellent waterproof performance A concrete floor structure using the plate-like finishing material can be obtained.

It is a fragmentary sectional view which shows typically the cross section of the waterproof floor structure of this invention. It is a fragmentary sectional view which shows typically the cross section of the waterproof floor structure of this invention. It is the schematic which shows the result of having evaluated the horizontal level of the floor surface before and behind placing a self-leveling material slurry on a concrete floor. It is a schematic diagram which shows the outline which evaluates the self-leveling property of a hydraulic slurry using a SL measuring device.

Explanation of symbols

11: Concrete floor structure 12: Hydraulic mortar hardened layer 13: Primer layer for polymer cement-based coating waterproofing material 14: Polymer cement-based coating waterproofing material layer 15: Tightening mortar 16: Plate-like finishing material 17: Self-leveling Material primer layer 18: Self-leveling material slurry cured body layer

Claims (8)

A waterproof floor structure comprising a step of applying a coating-type waterproofing material on an upper surface of a concrete floor to provide a coating-type waterproofing material layer, and a step of laying a plate-like finishing material on the upper surface of the coating-type waterproofing material layer using a mortar The coating type waterproofing material includes a primer for a polymer cement type coating film waterproofing material and a polymer cement type coating film waterproofing material, and the coating type waterproofing material layer has an elongation rate of 100 to 300% at room temperature. A construction method of a waterproof floor structure characterized by comprising: The step of providing a coating type waterproof material layer is
Applying a polymer cement-based waterproofing primer to a concrete floor upper surface and drying to form a primer layer for the polymer cement-based waterproofing material, and a hydraulic composition and polymer containing alumina cement on the upper surface of the primer layer 2. A waterproof floor structure according to claim 1, comprising a step of applying a polymer cement-based waterproofing membrane material prepared by kneading the emulsion and curing to provide a polymer cement-based waterproofing membrane layer. Body construction method. The construction method of the waterproof floor structure according to any one of claims 1 to 3, wherein the thickness of the polymer cement-based coating film waterproofing material layer is 0.1 to 2 mm. The hydraulic composition of the polymer cement-based waterproofing coating material contains alumina cement, and further contains at least one component selected from inorganic powder, fine aggregate, setting agent, fluidizing agent, thickener and antifoaming agent. The construction method of the waterproof floor structure according to any one of claims 1 to 3, comprising at least one seed. The construction method of the waterproof floor structure according to any one of claims 1 to 4, wherein the polymer emulsion of the polymer cement-based waterproofing material is an acrylic emulsion or an ethylene / vinyl acetate emulsion. The plate-like finishing material is one or more selected from natural stone, artificial stone, ceramic plate or ceramic tile, and the size of the plate-like finishing material is 30 to 600 mm in length. The construction method for a waterproof floor structure according to any one of claims 1 to 5, wherein the length is 30 to 600 mm and the thickness is 3 to 20 mm. Placing hydraulic mortar on the top of the concrete floor and curing it, providing a hardened mortar hardened body layer, and applying a coatable waterproof material on the upper surface of the hardened hydraulic mortar hardened layer The construction method of the waterproof floor structure according to any one of claims 1 to 6. The waterproof floor structure obtained by the construction method of the waterproof floor structure of any one of Claims 1-7.

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