JP6086034B2 - Construction method of waterproof structure - Google Patents

Description

  The present invention relates to a method for constructing a waterproof structure having an asphalt base conditioner or a waterproof sheet on a rooftop of a general building, a roof balcony, or the like.

  When constructing a waterproof layer on the foundation surface (construction surface) of a building, a sheet-type waterproof material (hereinafter referred to as a waterproof sheet) is mainly used. As a construction method, a torch construction method in which the lower surface (lowermost layer) of the waterproof sheet is melted with a torch burner and the lowermost layer of the waterproof sheet is self-adhesive, and it is laid on the floor surface without using fire. It is roughly divided into self-adhesion methods. In addition, if the ground surface of the building is not flat and there are many irregularities, the ground surface is renovated, the existing waterproof sheet remains as it is, or the remaining waterproof sheet is removed When laying a waterproof sheet on the floor, there was a case where sufficient adhesion to the floor surface could not be obtained, the method of applying the asphalt-based foundation conditioning material on the floor surface, and applying the waterproof sheet thereon Has been proposed.

  Patent Document 1 discloses a ground conditioner containing a hydraulic component including alumina cement, gypsum, and blast furnace slag, and asphalt, a water reducing agent, and a thickener, and is sufficient as a ground conditioner in a wide temperature range. It is shown that not only the workability is excellent by maintaining the fluidity and the fluid retention time, but also has an early opening property that can be opened the day after construction.

  Patent Document 2 discloses a water-resistant base preparation that has a hydraulic composition containing alumina cement and a hydraulic composition containing hydrogenpolysiloxane silicone oil, and a rubber asphalt emulsion, and has long-term storage stability. Therefore, it must be mixed with a rubber asphalt emulsion, the curing time and fluidity are stable, it has sufficient temporary waterproofing, the hydration curing speed is fast, and the workability and workability are stable. It is shown.

  Patent Document 3 includes a step of laying an asphalt waterproof sheet on the construction surface of the structure, and a step of applying a polymer cement composition on the upper surface of the asphalt waterproof sheet, thereby providing a foundation layer such as concrete. There is disclosed a composite waterproof construction method that has excellent ground cracking followability to cracks, has both high durability waterproof properties and good workability, and can form a flat finished surface.

JP 2001-139845 A JP 2005-239490 A JP 2008-231812 A

  In outdoor construction sites that are easily affected by the weather, even if the temperature changes suddenly, it is necessary to adjust the ground easily and evenly and to install the waterproof structure in a shorter time. There is a need for an asphalt-based base material that has excellent fluidity with small properties and has fast curing properties and an appropriate pot life. However, it has been difficult to control these characteristics in a well-balanced manner using only a chemical admixture such as a fluidizing agent and a setting modifier.

  Therefore, the present invention, when constructing a waterproof structure on the foundation surface of a general building rooftop or roof balcony, etc., easily adjust the foundation surface to be flat and smooth using an asphalt-based foundation conditioning material, Asphalt that can form a waterproof structure by applying the waterproof sheet of the next process in a short time, has excellent fluidity with low temperature dependence, and has fast curing and moderate pot life An object of the present invention is to provide a method for constructing a waterproof structure using a system base material.

  As a result of intensive studies to achieve the above object, the present inventors have determined that an asphalt-based foundation conditioning material to be constructed on the foundation surface of a building is a hydraulic component composed of alumina cement, Portland cement and gypsum, and fine aggregate. And a hydraulic composition containing a fluidizing agent and a coagulation adjusting agent, and a base preparation material containing a modified asphalt emulsion, thereby providing a waterproof structure on the base surface of a general building rooftop or roof balcony. When constructing, it is possible to easily adjust the surface of the foundation using an asphalt-based foundation conditioner, and to form a waterproof structure by constructing a waterproof sheet for the next process in a short time. There must be a method for constructing a waterproof structure using an asphalt base material that has excellent fluidity with low temperature dependence, and has fast hardness and moderate pot life. Heading, which resulted in the completion of the present invention.

That is, the present invention is a waterproof structure including a ground preparation step for constructing a base conditioning material on a construction surface of a building, and a waterproof sheet step for constructing a waterproof sheet on the top surface of the ground conditioning material by a torch method or a self-adhesion method. The body preparation method includes a hydraulic composition and a modified asphalt emulsion, and the hydraulic composition includes a hydraulic component composed of alumina cement, Portland cement and gypsum, fine aggregate, fluidized The alumina cement has a specific surface area of 1500 to 3800 cm ² / g and an average particle diameter of 13 to 30 μm, and the fine aggregate is based on the whole fine aggregate, The mass ratio of the particles having a particle diameter of not less than 2000 μm, a particle diameter of 600 μm or more and less than 1180 μm is 10% by mass or less, and the particle diameter is 300 The mass ratio of particles having a particle size of not less than μm and less than 600 μm is 60 to 80% by mass, the particle size of particles having a particle diameter of not less than 150 μm and less than 300 μm is 15 to 35% by mass, 70 to 300 parts by mass of fine aggregate with respect to 100 parts by mass of the component, and the modified asphalt emulsion provides a construction method for a waterproof structure that is 40 to 100 parts by mass with respect to 100 parts by mass of the hydraulic composition. .

  According to the method for constructing a waterproof structure of the present invention, when constructing a waterproof structure on a ground surface such as a rooftop of a general building or a roof balcony, the ground surface is easily flattened using an asphalt base conditioning material. It is possible to adjust the smoothness and then apply the waterproof sheet of the next process on it in a short time to form a waterproof structure, and the asphalt base material has excellent fluidity with low temperature dependence. In addition, it has fast hardness and moderate pot life. As described above, the reason why the asphalt base conditioner used in the method for constructing the waterproof structure according to the present invention has excellent fluidity with low temperature dependence, and has quick curing and an appropriate pot life is not necessarily clear. However, as one of the reasons, the present inventors have the effect that the respective components contained in the asphalt-based foundation conditioner interact with each other, and particularly the action caused by the combination of a specific alumina cement and a specific fine aggregate. However, it is thought that it contributes to having excellent fluidity | liquidity with small temperature dependence, quick-hardness, and moderate pot life.

  It is preferable that the construction method of the waterproof structure of the present invention is as follows. The construction method of the waterproof structure of the present invention more preferably combines the following aspects as appropriate.

  It is preferable that the hydraulic component of the base preparation material includes 30 to 70% by mass of alumina cement, 20 to 60% by mass of Portland cement, and 1 to 20% by mass of gypsum in 100% by mass of the hydraulic component. Thereby, quick-hardness and moderate pot life can be improved more, and a better waterproof structure can be constructed.

  It is preferable to include 0.01 to 2.00 parts by mass of a fluidizing agent with respect to 100 parts by mass of the hydraulic component of the base material. Thereby, fluidity | liquidity and moderate pot life can be improved more, and a more favorable waterproofing structure can be constructed.

  The setting adjuster of the base material is composed of a setting accelerator and a setting retarder, and 0.01 to 2.00 parts by weight of the setting accelerator and 0.01 to 2 parts of the setting retarder with respect to 100 parts by mass of the hydraulic component. It is preferable to contain 0.000 part by mass. Thereby, fluidity | liquidity, quick-hardness, and an appropriate pot life can be improved more, and a more favorable waterproof structure can be constructed.

  It is preferable that the modified asphalt emulsion of the base material contains 40 to 70% by mass of solid content in 100% by mass of the modified asphalt emulsion. Thereby, it can be set as the foundation | substrate adjustment material which has the further outstanding fluidity | liquidity, quick-hardness, and moderate pot life, and a more favorable waterproof structure can be constructed.

  According to the present invention, when constructing a waterproof structure on a ground surface such as a rooftop of a general building or a roof balcony, the ground surface is easily adjusted to be flat and smooth using an asphalt-based ground conditioning material. Asphalt that can form a waterproof structure by applying the waterproof sheet of the next process in a short time, has excellent fluidity with low temperature dependence, and has fast curing and moderate pot life The construction method of the waterproof structure using the system base conditioner can be provided.

It is a schematic diagram which shows an example of the construction procedure of a waterproof structure. It is a schematic diagram which shows an example of the construction procedure of a waterproof structure. It is a schematic diagram which shows an example of the construction procedure of a waterproof structure. It is a schematic diagram which shows an example of the construction procedure of a waterproof structure. It is a schematic diagram which shows an example of the construction procedure of a waterproof structure. It is a figure which shows the particle diameter-accumulated sieve mass% curve of an alumina cement.

<Waterproofing method>
A preferred embodiment of the waterproof construction method for the waterproof structure of the present invention will be described below. The construction method of the waterproof structure of the present embodiment is a method of constructing a waterproof structure having an asphalt base conditioning material or a waterproof sheet on a base surface of a general building rooftop or roof balcony, etc. Is a construction method of a waterproof structure including a foundation adjustment process for constructing a foundation adjustment material and a waterproof sheet process for constructing a waterproof sheet on the upper surface of the foundation adjustment material by a torch method or a self-adhesion method.

  The construction method of the waterproof structure of this embodiment is demonstrated according to FIGS.

  FIGS. 1-5 is a schematic diagram which shows the procedure which applies the construction method of the waterproof structure of this invention to the construction surface (a base surface of a roof as an example) of a building.

(Cleaning process)
In the waterproof structure construction method of the present invention, first, as shown in FIG. 1, the entire surface of the construction surface 11 of the building 10 is removed to remove deposits such as dust, dust and dirt on the construction surface. In addition, when the existing waterproof sheet remains as it is due to the renovation work, or the remaining after the waterproof sheet is peeled off, the construction surface 11 is sufficiently adhered to the foundation of the building 10. Check.

(Background adjustment process)
Next, the base material is prepared by mixing homogeneously with a hand mixer or the like. Further, water can be added and mixed within a range that does not impair the properties of the base material. As shown in FIG. 2, the base material prepared using a plasterer or the like is applied so as to be flat and smooth. The foundation adjustment material according to the construction method of the waterproof structure of the present embodiment is a hydraulic composition including a hydraulic component made of alumina cement, Portland cement, and gypsum, a fine aggregate, a fluidizing agent, and a setting modifier. Products, and modified asphalt emulsions.

(Waterproof sheet process)
Next, as shown in FIG. 3, in the waterproof sheet process of constructing (laying) the waterproof sheet 14 on the upper surface of the ground preparation material 13 constructed on the construction surface 11 of the building 10, depending on the type of the waterproof sheet 14, The waterproof sheet 14 is applied to the upper surface of the base material 13 by a construction method.

  The waterproof sheet 14 used in the torch method is preferably an asphalt-based waterproof sheet in which at least a modified asphalt layer A, a nonwoven fabric, a modified asphalt layer B, and a synthetic resin film are laminated and integrated in this order, and JIS A 6013 “modified asphalt It is preferable to be suitable for “roofing”. Moreover, the modified asphalt layer A and the modified asphalt layer B are preferably the same composition or different compositions as long as they have good waterproofness, adhesiveness, integration and workability. Can be used. Furthermore, an asphalt waterproof sheet obtained by laminating and integrating an aggregate layer, a modified asphalt layer, a nonwoven fabric, a modified asphalt layer, and a synthetic resin film in this order can also be suitably used.

  In the torch construction method, the synthetic resin film surface of the waterproof sheet 14 is disposed so as to be in contact with the upper surface of the base adjustment material 13, and the synthetic resin film surface is wound with a torch burner or the like, and at the timing when the synthetic resin film surface is melted, Laying on the upper surface of the base material 13, the asphalt waterproof sheet 14 is bonded to the upper surface of the base material 13.

  And the edge part 16 of the short side direction of the asphalt type | system | group waterproof sheet 14 laid in advance and the edge part 16 of the short side direction of the asphalt type | mold waterproof sheet | seat 14 laid from back are preferably overlapped 100-150 mm. Good waterproof performance can be obtained by laying and bonding together.

  Next, as shown in FIG. 4, an asphalt waterproof sheet 17 is laid and adhered to the waterproof sheet 14 from the side wall 12 and the corner of the building 10. Moreover, it is preferable to lay the asphalt waterproof sheet 17 with a width of 50 to 150 mm so as to overlap the waterproof sheet 14 from the corner. Here, as the waterproof sheet 17, either the waterproof sheet for the torch method or the waterproof sheet for the self-adhesive method similar to the waterproof sheet 14 can be suitably used.

  Further, as shown in FIG. 5, a coating material mainly composed of a slurry-like polymer cement-based composition or a synthetic resin is applied to the upper surfaces of the laid asphalt waterproof sheet 14 and the waterproof sheet 17 and cured. A coating process for forming a film may be included. By assembling and integrating the asphalt waterproof sheet and the coating film, waterproofness and weather resistance can be further improved.

  The waterproof sheet 14 used in the self-adhesion method is preferably a self-adhesive asphalt waterproof sheet in which at least a modified asphalt layer, a nonwoven fabric, and a modified asphalt layer having self-adhesive properties are laminated and integrated in this order. Furthermore, a breathable multilayer sheet having a plurality of openings can be laminated and integrated with the modified asphalt layer having self-adhesion. As a result, the modified asphalt layer having self-adhesion and the upper surface of the base conditioning material 13 are bonded to each other through the opening, and air can be passed through the breathable multilayer sheet. Moreover, by attaching a release sheet to a modified asphalt layer having a self-adhesive property or a breathable multilayer sheet having a plurality of openings, it is possible to prevent self-adhesion before construction.

  In the self-adhesion method, the self-adhesive modified asphalt layer of the above-described waterproof sheet 14 or a breathable multilayer sheet surface having a plurality of openings is laid so as to be in contact with the upper surface of the base conditioning material 13, and the asphalt waterproof sheet 14 Is adhered to the upper surface of the base material 13.

    And the edge part 16 of the short side direction of the asphalt type | system | group waterproof sheet 14 laid in advance and the edge part 16 of the short side direction of the asphalt type | mold waterproof sheet | seat 14 laid from back are preferably overlapped 100-150 mm. Good waterproof performance can be obtained by laying and bonding together.

  Next, as shown in FIG. 4, an asphalt waterproof sheet 17 is laid and adhered to the waterproof sheet 14 from the side wall 12 and the corner of the building 10. Moreover, it is preferable to lay the asphalt waterproof sheet 17 with a width of 50 to 150 mm so as to overlap the waterproof sheet 14 from the corner. Here, as the waterproof sheet 17, either the waterproof sheet for the torch method or the waterproof sheet for the self-adhesive method similar to the waterproof sheet 14 can be suitably used.

  Furthermore, as shown in FIG. 5, a top coating material 18 can be applied to the upper surfaces of the laid asphalt waterproof sheet 14 and the waterproof sheet 17. As the topcoat material, a commercially available product such as a slurry-like polymer cement composition or a coating material mainly composed of a synthetic resin can be used, and the topcoat material 18 is applied and cured to form a coating film. It can have a coating process to form. By assembling and integrating the asphalt waterproof sheet 14 and the top coat 18, waterproofness and weather resistance can be further improved.

<Ground adjustment material>
A preferred embodiment of the base material according to the waterproof construction method of the waterproof structure of the present invention will be described below. The foundation conditioning material of this embodiment is an asphalt-based foundation conditioning material used as a foundation for a waterproof sheet when constructing a waterproof structure on a foundation surface such as a roof of a general building or a roof balcony. Alumina cement, Portland cement, and It is a foundation composition containing a hydraulic component composed of gypsum, a fine aggregate, a fluidizing agent, a coagulation regulator, and a modified asphalt emulsion.

  Hereinafter, each component contained in the foundation | substrate adjustment material of this embodiment is demonstrated in detail.

<Hydraulic composition>
Several types of alumina cements having different mineral compositions are known and commercially available, but those whose main component is monocalcium aluminate (CA) are preferred. The brane specific surface area of the alumina cement contained in the substrate conditioning material of the present embodiment is 1500 to 3800 cm ² / g, preferably 1800 to 3700 cm ² / g, more preferably 2000 to 3600 cm ² / g, preferably 2300~3500cm ² / g, particularly preferably be 2500~3400cm ² / g. Here, the brane specific surface area of the alumina cement is determined in accordance with JIS R 2521: 1995.

  The alumina cement has a Blaine specific surface area within the above range, and the average particle size of the alumina cement is 13.0 to 30.0 μm, preferably 13.5 to 25.0 μm, more preferably 14.0. ˜22.0 μm, more preferably 14.5 to 20.0 μm, and particularly preferably 15.0 to 18.0 μm. When the Blaine specific surface area and average particle diameter of the alumina cement are within the above ranges, it contributes to excellent fluidity with low temperature dependence, fast curability, and appropriate pot life.

  Furthermore, with respect to the entire alumina cement, the cumulative mass ratio of particles on each particle diameter of the alumina cement (particle diameter—total mass% on the sieve) is such that the mass ratio of particles having a particle diameter of 96 μm or more exceeds 0. The mass ratio of particles having a particle diameter of 0 to 20% by mass and a particle diameter of 64 μm or more is 1.5 to 20 mass%, and the mass ratio of particles having a particle diameter of 48 μm or more is 6.0 to 30 mass%. The mass ratio of particles having a particle diameter of 32 μm or more is preferably 18 to 50 mass%, the mass ratio of particles having a particle diameter of 96 μm or more is 0.1 to 5.5 mass%, and the particle diameter is 64 μm. The mass ratio of particles having a particle diameter of 2.0 to 17 mass% and a particle diameter of 48 μm or more is 7.0 to 27 mass% and the particle diameter of 32 μm or more. The ratio is 19 ~ More preferably, it is 48 mass%, the mass ratio of the particle | grains whose particle diameter is 96 micrometers or more is 0.2-5.0 mass%, and the mass ratio of the particle | grains whose particle diameter is 64 micrometers or more is 3.0-14. More preferably, the mass ratio of particles having a particle diameter of 48 μm or more is 8.0 to 23 mass%, and the mass ratio of particles having a particle diameter of 32 μm or more is 20 to 42 mass%. The mass ratio of particles having a particle diameter of 96 μm or more is 0.3 to 4.5 mass%, the mass ratio of particles having a particle diameter of 64 μm or more is 4.0 to 12 mass%, and the particle diameter is 48 μm. It is particularly preferable that the mass ratio of the particles as described above is 9.0 to 22 mass%, and the mass ratio of the particles having a particle diameter of 32 μm or more is 20 to 37 mass%. When the mass ratio of the particle diameter of the alumina cement is in the above-described range, it is more sure to have excellent fluidity with low temperature dependency, quick curing, and an appropriate pot life.

  The integrated sieve mass ratio (particle diameter—integrated sieve mass%) of each particle size of the alumina cement was measured using a laser diffraction particle size distribution analyzer [manufactured by Seishin Enterprise, LMS-30 (Laser Micro Sizer)]. From the measured particle size distribution, a particle diameter-cumulative sieving mass% curve can be created and calculated, and the average particle diameter is a particle whose cumulative sieving mass% is 50% from the particle diameter-integrated sieving mass% curve. The diameter.

  Portland cement is a common hydraulic material, and any commercially available product can be used. Among these, it is preferable to use Portland cement specified by JIS R 5210: 2009 “Portland cement”.

  Examples of gypsum include dihydrate gypsum, hemihydrate gypsum, and anhydrous gypsum, and any of gypsum produced as a by-product in flue gas desulfurization and hydrofluoric acid production processes, or gypsum produced in nature can be used. . From the viewpoint of workability, anhydrous gypsum is preferably used.

  According to the present embodiment, by using a hydraulic component made of alumina cement, Portland cement, and gypsum, it is possible to obtain an undercoat conditioning material that has excellent quick-hardness compared to Portland cement alone.

  The hydraulic component preferably contains 30 to 70% by mass of alumina cement, 20 to 60% by mass of Portland cement, and 1 to 20% by mass of gypsum in 100% by mass of the hydraulic component, 35 to 65% by mass of alumina cement, and Portland cement. More preferably 25 to 55% by mass, 3 to 18% by mass of gypsum, more preferably 40 to 60% by mass of alumina cement, 30 to 50% by mass of Portland cement, and 4 to 16% by mass of gypsum, and alumina cement 45 It is particularly preferable to contain ~ 55 mass%, Portland cement 35-45 mass%, and gypsum 5-15 mass%. When the alumina cement, the Portland cement and the gypsum are in the above ranges, the quick setting and the appropriate pot life can be further improved.

  The fine aggregate does not contain particles having a particle diameter of 2000 μm or more, the particle ratio is 600 μm or more and less than 1180 μm, based on the whole fine aggregate. The mass ratio of particles having a particle diameter of 300 μm or more and less than 600 μm is 60 to 80 mass%, and the mass ratio of particles having a particle diameter of 150 μm or more and less than 300 μm is 15 to 35 mass%.

  Further, based on the whole fine aggregate, the particle diameter is not more than 2000 μm, the particle diameter is 600 μm or more, and the mass ratio of the particles less than 1180 μm is 9% by mass or less, and the particle diameter is 300 μm or more. It is preferable that the mass ratio of the particles having a particle diameter of less than 600 μm is 63 to 77 mass%, the particle diameter of the particle diameter being 150 μm or more and less than 300 μm is 18 to 32 mass%.

  Further, based on the whole fine aggregate, the particle diameter is not more than 2000 μm, the particle diameter is not less than 600 μm, and the mass ratio of the particles less than 1180 μm is not more than 8 mass%, and the particle diameter is not less than 300 μm. More preferably, the mass ratio of the particles having a particle diameter of less than 600 μm is 65 to 75 mass%, and the mass ratio of the particles having a particle diameter of 150 μm or more and less than 300 μm is 20 to 30 mass%.

  When the fine aggregate has a particle diameter within the above range, it contributes to having excellent fluidity with low temperature dependence.

  The particle diameter of the fine aggregate can be measured by using several sieves having different nominal sizes as defined in JIS Z8801-1: 2006 “Test sieve—Part 1: Metal mesh sieve”. Further, in this specification, “the mass ratio of particles having a particle diameter of less than 2000 μm” means the mass ratio of particles passing through a sieve having a sieve size of 2000 μm with respect to the entire fine aggregate when using a sieve having a sieve size of 2000 μm. Say. Further, “the mass ratio of particles having a particle diameter of 300 μm or more and less than 600 μm” means that when a sieve having a sieve size of 600 μm is used, a sieve having a sieve size of 600 μm is passed through and a sieve having a sieve size of 300 μm is used. When used, it refers to the mass ratio of particles remaining on a sieve having a mesh size of 300 μm to the entire fine aggregate.

  As such fine aggregates, those selected from sands such as quartz sand, river sand, land sand, sea sand and crushed sand can be suitably used.

  The content of the fine aggregate in the base material of the present embodiment is 70 to 300 parts by mass, preferably 75 to 200 parts by mass, and more preferably 80 to 160 parts with respect to 100 parts by mass of the hydraulic component. It is a mass part, Most preferably, it is 85-140 mass part.

  By making content of a fine aggregate into the said range, it contributes to having the outstanding fluidity | liquidity with small temperature dependence.

  The fluidizing agent has a water reducing effect and is commercially available such as naphthalene sulfonic acid, melamine sulfonic acid, lignin sulfonic acid, casein, casein calcium, polycarboxylic acid, polyether and polyether polycarboxylic acid. The fluidizing agent can be used regardless of the type thereof, and it is particularly preferable to use a commercially available fluidizing agent based on melamine sulfonic acid.

  The content of the fluidizing agent in the base material of the present embodiment is preferably 0.01 to 2.00 parts by mass, more preferably 0.05 to 1.50 parts by mass with respect to 100 parts by mass of the hydraulic component. More preferably, it is 0.08-1.00 mass part, Most preferably, it is 0.10-0.50 mass part.

  By setting the content of the fluidizing agent in the above range, the fluidity can be further improved.

  The setting modifier is used to adjust the hydration reaction of the hydraulic component. The setting modifier includes a setting accelerator that accelerates the hydration reaction of the hydraulic component and a setting retarder that delays the hydration reaction of the hydraulic component. Depending on the combination of the hydraulic component used, The addition amount is appropriately selected.

  As the setting retarder, a known component that delays hydration can be used. For example, organic acids such as oxycarboxylic acids, sugars such as glucose, maltose, dextrin, sodium bicarbonate, sodium phosphate, etc. may be used alone or in combination of two or more components. it can.

  Oxycarboxylic acids include oxycarboxylic acids and their salts. Examples of oxycarboxylic acid include citric acid, gluconic acid, tartaric acid, glycolic acid, lactic acid, hydroacrylic acid, α-oxybutyric acid, glyceric acid, tartronic acid, malic acid and other aliphatic oxyacids, salicylic acid, m-oxy Mention may be made of aromatic oxyacids such as benzoic acid, p-oxybenzoic acid, gallic acid, mandelic acid and tropic acid.

  Examples of the salt of oxycarboxylic acid include alkali metal salts (specifically sodium salt and potassium salt) and alkaline earth metal salts (specifically calcium salt, barium salt and magnesium salt). Sodium salts are more preferred. In particular, sodium citrate is preferred from the standpoint of setting delay effect, availability, and cost, and more preferably used in combination with sodium bicarbonate.

  The content of the setting retarder in the base material of the present embodiment is preferably 0.01 to 2.00 parts by mass, more preferably 0.05 to 1.00 parts by mass with respect to 100 parts by mass of the hydraulic component. More preferably, it is 0.08-0.75 mass part, Most preferably, it is 0.10-0.50 mass part.

  By setting the content of the setting retarder in the above range, an appropriate pot life can be further improved.

  As the setting accelerator, known components that promote hydration can be used. For example, lithium salt, aluminum sulfate, and calcium chloride can be preferably used, and several of these can be used in combination.

  Examples of lithium salts include inorganic lithium salts such as lithium carbonate, lithium chloride, lithium sulfate, lithium nitrate and lithium hydroxide, and organic acid organics such as lithium oxalate, lithium acetate, lithium tartrate, lithium malate and lithium citrate. A lithium salt can be mentioned. In particular, lithium carbonate is preferable from the viewpoint of the setting acceleration effect, availability, and cost.

  As the setting accelerator, those having a particle size that does not interfere with the properties of the base preparation material are preferably used, and the particle size is preferably 50 μm or less. Particularly when a lithium salt is used, the particle diameter of the lithium salt is preferably 50 μm or less, more preferably 30 μm or less, still more preferably 20 μm or less, and particularly preferably 10 μm or less. When the particle diameter of the lithium salt is larger than the above range, the solubility of the lithium salt is decreased, which is not preferable.

  The setting accelerator in the base preparation material of the present embodiment is preferably 0.01 to 2.00 parts by mass, more preferably 0.10 to 1.20 parts by mass, further preferably 100 parts by mass of the hydraulic component. Is 0.30 to 1.00 parts by mass, particularly preferably 0.50 to 0.80 parts by mass.

  By setting the content of the setting accelerator within the above range, it is possible to further improve the fast curing and the appropriate pot life.

  According to the purpose, the hydraulic composition in the base material for adjustment according to the present embodiment can be added by appropriately selecting an antifoaming agent, a thickener and the like within a range not impairing the characteristics of the present invention.

  It is preferable to add an antifoaming agent to the hydraulic composition in order to prevent pinholes due to air bubbles in the base preparation obtained by mixing with the modified asphalt emulsion. By adding a thickener to the hydraulic composition, the material separation is suppressed to a more sufficient level while ensuring the fluidity of the paste-like or slurry-like base material prepared by mixing with the modified asphalt emulsion. be able to.

As long as it can be used for mortar and concrete, any anti-foaming agent can be used. For example, mineral oil-based, silicone-based, alcohol-based, polyether-based synthetic materials, plant-derived natural materials, etc. Can be used.
The antifoaming agent can be appropriately added in a range that does not impair the properties, depending on the hydraulic component used, and is preferably 0.01 to 0.30 parts by mass with respect to 100 parts by mass of the hydraulic component. Preferably it is 0.03-0.20 mass part, More preferably, it is 0.04-0.15 mass part, Most preferably, it is 0.05-0.11 mass part. If the addition amount of the antifoaming agent is too small, a suitable effect is not exhibited, and if the addition amount is too large, an effect commensurate with the addition amount cannot be expected.

  Examples of the thickener include commercially available products such as cellulose, protein, latex, and water-soluble polymer. Among these, cellulose thickeners are preferable from the viewpoint of price and availability. Cellulosic thickeners include hydroxyethyl cellulose, hydroxyethyl methyl cellulose, hydroxypropyl methyl cellulose, and the like, which can be used in any combination.

  The hydraulic composition in the base material of the present embodiment can be mixed with a general mixer to prepare the hydraulic composition homogeneously. As the mixer, a known mixer can be used, and examples thereof include a Nauter mixer, a ribbon mixer, and an omni mixer.

  The hydraulic composition is mixed with a general mixer to prepare the composition homogeneously, and in addition to cement packaging bags, paper bags, polyethylene bags and polyvinyl bags, which are generally used in powder form, the outside air It can be stored in a metal / organic airtight container without contact.

<Modified asphalt emulsion>
The modified asphalt emulsion is contained in the base preparation material in order to improve adhesion to the base and the waterproof layer laid on the base and crack resistance. In addition, when the new waterproofing layer is an asphalt waterproofing layer, the base preparation material containing the modified asphalt emulsion can achieve high adhesion with the new asphalt waterproofing layer without using a primer. Even though it does not explode, it contributes to higher adhesion through a state close to melting. Furthermore, even if an old waterproof layer, especially an old asphalt waterproof layer, etc. remains on the foundation in the renovation work, a high adhesive force is obtained, and it is integrated with the waterproof layer laid on top, and a good waterproof structure is obtained. Can be obtained.

  The modified asphalt emulsion is obtained by dispersing a solid content containing modified asphalt in water or a water-containing solvent, and preferably contains 40 to 70% by mass of solid content in 100% by mass of the modified asphalt emulsion. It is more preferable to contain -65 mass%, and it is especially preferable to contain solid content 50-60 mass%.

  By containing the solid content in the above-mentioned range, a more stable dispersion state can be maintained as an emulsion, and better miscibility can be obtained when preparing a base material by mixing with a hydraulic composition. .

  The content of the modified asphalt emulsion in the base preparation material of the present embodiment is preferably 40 to 100 parts by weight, more preferably 50 to 90 parts by weight, with respect to 100 parts by weight of the hydraulic composition. Preferably it is 55-85 mass parts, Most preferably, it is 60-80 mass parts.

  By setting the content of the modified asphalt emulsion in the above range, it contributes to having excellent fluidity with low temperature dependency, fast curability and an appropriate pot life.

  As the modified asphalt emulsion, one obtained by a known production method can be used. For example, asphalt modified by mixing rubber, polymer, etc. with asphalt in the presence of an emulsifier in water or a water-containing solvent (modified). Quality asphalt) and rubber and / or polymer emulsified and dispersed. The modified asphalt emulsion is produced by a known method such as a method in which rubber and / or polymer and modified asphalt in which rubber and / or polymer is mixed with heat-melted asphalt are mixed through an emulsifier. Can be used.

  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.

  In the modified asphalt emulsion, the rubber component includes natural rubber, ethylene propylene diene copolymer rubber, ethylene butene copolymer rubber, polyisoprene, isoprene / butadiene copolymer, styrene / butadiene copolymer (for example, SBS, SBR, etc.) ), Styrene / isoprene block copolymer rubber, and hydrogenated products thereof, copolymer of methacrylate and butadiene, copolymer of acrylate and butadiene, copolymer of acrylonitrile and butadiene, polybutadiene, polychloroprene, polyisobretin, butyl rubber Polyurethane, etc., and modified products in which functional groups such as carboxyl group and glycidyl group are introduced. Polymer components include polyethylene, polypropylene, polybutene, polystyrene, ethylene Rate copolymer, ethylene / methacrylate copolymer, vinyl acetate / acrylate copolymer, vinyl acetate / methacrylate copolymer, ethylene / vinyl acetate copolymer, vinyl acetate / fatty acid vinyl ester copolymer, vinyl acetate Diester copolymer such as maleic acid, fumaric acid, itaconic acid, alkyl methacrylate / alkyl acrylate copolymer, styrene / alkyl acrylate copolymer, ethylene / alkyl acrylate copolymer, ABS resin, polyvinyl chloride, etc. These polymers are modified products in which a functional group such as acid modification such as carboxyl group and maleic acid is introduced.

  As the asphalt, naturally occurring asphalt or asphaltite, petroleum asphalt such as straight asphalt, blown asphalt, cutback asphalt, or a mixture of these asphalts can be preferably used. Asphalt may be used with a small amount of process oil, oil such as lubricating oil, anthracene oil, pine oil, creosote oil or the like. Furthermore, an antioxidant can be added.

  The base material of the present embodiment is prepared by mixing the hydraulic composition and the modified asphalt emulsion homogeneously, and when the waterproof structure is applied to the base surface of a general building rooftop or roof balcony, the base The waterproof structure can be formed by easily adjusting the surface to be flat and smooth and then applying the waterproof sheet in the next step on the surface in a short time. Further, water can be further added to the hydraulic composition and the modified asphalt emulsion within a range not impairing the characteristics of the present invention.

The foundation adjusting material of the present embodiment can be applied more easily and flatly and smoothly to a thickness of about 1 to 10 mm by using scissors, rubber spatula, or a roller brush depending on the construction conditions. it can. At that time, the flow value of the base material that serves as an index of fluidity is preferably 200 to 240 mm, more preferably 205 to 230 mm under the condition of 23 ° C. Under the condition of 35 ° C., 210 to 250 mm is preferable, and 215 to 240 mm is more preferable.
Moreover, 0.90 to 1.10 is preferable and 0.95 to 1.05 is more preferable as the flow ratio of the base adjustment material that serves as an indicator of fluidity having low temperature dependence.

  Furthermore, the base material of this embodiment has fast hardness and moderate pot life in order to be able to start the next process in a short time. The pot life (hr), which is an index of an appropriate pot life (workable time), is preferably 2.5 hr or less and more preferably 2 hr or less under the condition of 23 ° C. Under the condition of 35 ° C., 2 hr or less is preferable, and 1.5 hr or less is more preferable. The curing time (hr), which is an index of fast curing, is preferably 2 to 5 hr, more preferably 2 to 4 hr under the condition of 23 ° C. Under the condition of 35 ° C., 1 to 2.5 hr is preferable, and 1 to 2 hr is more preferable. Here, since it is preferable to harden as soon as possible after completion of construction, the pot life and the curing time may be the same. The above-mentioned hr is an abbreviation of hour or hours.

  When the flow value of the base material is within the above range, the fluidity is excellent and good workability can be achieved. Moreover, it can have the outstanding fluidity | liquidity with small temperature dependence because the flow ratio of a base | substrate adjustment material is the said range. Furthermore, by having the pot life and curing time of the base preparation material within the above ranges, it has fast curing and an appropriate pot life, and can start the next process in a short time.

  Here, the “flow value” of the base conditioning material is a value measured at 20 ° C. and 35 ° C. in accordance with the test method described in JASS 15M-103 “Architectural Institute of Japan: Quality standards for self-leveling material”. (Unit: mm). The “flow ratio” refers to a value obtained by dividing the flow value at 35 ° C. by the flow value at 23 ° C. The “pot life” refers to the time from the flow value of the base preparation material immediately after preparation until the flow value becomes 80% or less. “Curing time” refers to a base material prepared by pouring the base material immediately after preparation into a plastic container so that the thickness becomes 10 mm, and using a rubber hardness meter (CS type, manufactured by Kobunshi Keiki Co., Ltd.). Is the time from when the surface hardness is measured and the base material is poured, until the hardness reaches 90.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment.

  The contents of the present invention will be described in more detail with reference to the following experimental examples, but the present invention is not limited to the following experimental examples.

(Experimental example 1)
A hydraulic composition is prepared by blending fine aggregate, fluidizer, setting modifier and antifoaming agent in 100 parts by mass of the hydraulic component in parts by mass shown in Table 3, and the modified asphalt emulsion is added to the water. An undercoat conditioning material was prepared by blending with 100 parts by mass of the hard composition in parts by mass shown in Table 3. In Table 3, the hydraulic components alumina cement, Portland cement and gypsum were blended so that the total of the respective parts by mass was 100 parts by mass. The kneading of the base material was performed at 700 rpm for 3 minutes using a stirrer (manufactured by Yamato Kagaku Co., Ltd., Lab Stirrer LR400D) under the conditions of a temperature of 23 ° C. and a temperature of 35 ° C. Immediately after kneading, the flow value was measured, and then the pot life and curing time were measured under conditions of 23 ° C. and 35 ° C.

[Materials used]
(1) Hydraulic component ・ Alumina cement A (Blaine specific surface area: 3950 cm ² / g, average particle size: 12.2 μm, particle size—mass% on integrated sieve: as shown in Table 1 and FIG. 6)
Alumina cement B (Blaine specific surface area: 2900 cm ² / g, average particle size: 16.5 μm, particle size—total mass on sieve: as shown in Table 1 and FIG. 6)
・ Haya strong Portland cement (manufactured by Ube Mitsubishi Cement, Blaine specific surface area: 4580 cm ² / g)
Gypsum (natural anhydrous gypsum, Blaine specific surface area 4470 cm ² / g)

  The mass ratio of the total sieve sieve for each particle size of the alumina cement shown in Table 1 (particle diameter—total mass on the sieve sieve) is a laser diffraction type particle size distribution measuring apparatus [manufactured by Seishin Corporation, LMS-30 (Laser Micro Sizer). )] Was measured, and from the obtained particle size distribution, a particle diameter-accumulated mass% curve was created and calculated. A particle diameter-cumulative sieve mass% curve is shown in FIG. The average particle size was defined as the particle size at which the integrated sieve mass% was 50% from the particle size-integrated sieve mass% curve.

(2) Fine aggregates-Fine aggregates (Table 2 shows the particle size composition of fine aggregates measured using silica sand and JIS sieves.)

(3) Fluidizer-Melamine sulfonic acid fluidizer (manufactured by Nippon Seika Co., Ltd.)
(4) Setting controller-Setting accelerator (lithium carbonate, average particle size 3.5 µm)
-Setting retarder A (sodium citrate)
-Setting retarder B (sodium bicarbonate)
(5) Antifoaming agent Mineral oil-based antifoaming agent ([including mineral oil and special nonionic surfactant], manufactured by ADEKA)
(6) Modified asphalt emulsion (manufactured by Ube Industries, Ltd., containing asphalt, butadiene / styrene copolymer, water as the main component, solid content 52%)

[Method for evaluating physical properties]
The flow value, pot life and curing time of the prepared base preparation materials of each Example and each Comparative Example were measured. The measurement results were as shown in Table 4. Each measurement was performed by the method shown below.

(1) Flow value measurement method In accordance with the test method described in JASS 15M-103 “The Architectural Institute of Japan: Quality standards for self-leveling materials”, the base material was prepared at 23 ° C. and 35 ° C., respectively. Immediately measured at each temperature.
(2) Measuring method of pot life In the measurement of the flow value described above, the base material prepared at 23 ° C. and 35 ° C. was allowed to stand for a certain period of time, and the flow value was measured every predetermined time. The time from the flow value to 80% or less was measured as the pot life.
(3) Curing time measurement method The substrate preparation material prepared at 23 ° C. and 35 ° C. was poured into a plastic container so as to have a thickness of 10 mm under each temperature condition, cured, and a rubber hardness meter (manufactured by Kobunshi Keiki Co., Ltd., CS type) was used to measure the surface hardness of the base material, and the time from when the base material was poured until the hardness reached 90 was measured as the curing time.

As shown in Table 4, it contains alumina cement A having a brain specific surface area of 3950 cm ² / g and an average particle diameter of 12.2 μm, and the fine aggregate content is 100 parts by mass with respect to 100 parts by mass of the hydraulic component. No. 1-1, although the flow value and flow ratio in each temperature condition showed good values, the pot life and curing time showed slow values in each temperature condition. A No. ² alloy containing alumina cement A having a brain specific surface area of 3950 cm ² / g and an average particle diameter of 12.2 μm and a fine aggregate content of 122 parts by mass with respect to 100 parts by mass of the hydraulic component. In 1-2, the flow value and the flow ratio under each temperature condition showed good values, but the pot life and the curing time showed slow values under each temperature condition. No. having a Blaine specific surface area of 2900 cm ² / g and an alumina cement B having an average particle diameter of 16.5 μm and a fine aggregate content of 67 parts by mass with respect to 100 parts by mass of the hydraulic component. 1-3 had a low flow value under a temperature condition of 35 ° C., and the flow ratio also decreased. No. 1 containing alumina cement B having a brain specific surface area of 2900 cm ² / g and an average particle diameter of 16.5 μm, and a fine aggregate content of 100 parts by mass with respect to 100 parts by mass of the hydraulic component. 1-4 showed good values for the flow value and flow ratio under each temperature condition, and the pot life and curing time also showed good values under each temperature condition. No. 1 containing alumina cement B having a brain specific surface area of 2900 cm ² / g and an average particle diameter of 16.5 μm and a fine aggregate content of 122 parts by mass with respect to 100 parts by mass of the hydraulic component. For 1-5, the flow value and flow ratio under each temperature condition showed good values, and the pot life and curing time also showed good values under each temperature condition.

  From the above, no. 1-4 and No.1. As in 1-5, a hydraulic composition comprising a hydraulic component made of a specific alumina cement, Portland cement and gypsum, a specific fine aggregate, a fluidizing agent, and a setting regulator, and modified asphalt It was confirmed that the base material containing the emulsion has excellent fluidity with small temperature dependence, and has fast curing and an appropriate pot life. That is, the base material used in the construction method of the waterproof structure according to the present invention is applied to the base surface of a general building such as a rooftop or a roof balcony, even if the temperature changes suddenly. A waterproof structure can be formed by easily adjusting the ground surface to be flat and smooth, and then applying a waterproof sheet for the next step on the substrate surface in a short time.

DESCRIPTION OF SYMBOLS 10 ... Building, 11 ... Construction surface, 12 ... Side wall, 13 ... Base material, 14 ... Waterproof sheet, 15 ... End part of long side direction, 16 ... End part of short side direction, 17 ... Waterproof sheet, 18 ... Top coating material, 51 ... Length change measuring device, 52 ... Mold, 53 ... Buffer material, 54 ... Eddy current displacement sensor, 55 ... SUS disk (55a, 55b, 55c), 56 ... SUS bar (56a, 56b) ), 57 ... Fluororesin sheet.

Claims (5)

A ground preparation process for constructing a ground conditioning material on the construction surface of the building,
A waterproof sheet process for constructing a waterproof sheet by a torch method or a self-adhesion method on the upper surface of the base material adjustment material,
The base preparation material includes a hydraulic composition and a modified asphalt emulsion,
The hydraulic composition includes a hydraulic component composed of alumina cement, Portland cement and gypsum, a fine aggregate, a fluidizing agent, and a setting modifier.
The alumina cement has a Blaine specific surface area of 1500 to 3800 cm ² / g and an average particle size of 13 to 30 μm,
The fine aggregate is based on the whole fine aggregate, does not contain particles having a particle size of 2000 μm or more, has a particle size of 600 μm or more and less than 1180 μm, and has a mass ratio of 10% by mass or less. The mass ratio of particles having a diameter of 300 μm or more and less than 600 μm is 60 to 80 mass%, the mass ratio of particles having a particle diameter of 150 μm or more and less than 300 μm is 15 to 35 mass%, 70 to 300 parts by mass of fine aggregate with respect to 100 parts by mass of hydraulic component,
The said modified asphalt emulsion is a construction method of the waterproof structure which is 40-100 mass parts with respect to 100 mass parts of hydraulic compositions. The hydraulic component includes 30 to 70% by weight of alumina cement, 20 to 60% by weight of Portland cement, and 1 to 20% by weight of gypsum in 100% by weight of the hydraulic component.
The construction method of the waterproof structure of Claim 1. Including 100 to 2.00 parts by mass of a fluidizing agent with respect to 100 parts by mass of the hydraulic component,
The construction method of the waterproof structure of Claim 1 or Claim 2. The setting modifier comprises a setting accelerator and a setting retarder,
Containing 100 to 100 parts by weight of the hydraulic component includes a setting accelerator 0.01 to 2.00 parts by weight, a setting retarder 0.01 to 2.00 parts by weight,
The construction method of the waterproof structure of any one of Claims 1-3. The said modified asphalt emulsion is a construction method of the waterproof structure of any one of Claims 1-4 which contains 40-70 mass% of solid content in 100 mass% of modified asphalt emulsions.

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