JP2013217033A - Substrate concrete surface high-pressure adjustment method, and substrate concrete floor construction method applying the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a substrate concrete surface high-pressure adjustment method for enabling the construction of a floor coating material without polluting a construction site with dust by removing laitance and fragile portions from the surface of a substrate concrete in a wetting condition, and to provide a substrate concrete floor construction method applying the same.SOLUTION: The substrate concrete surface high-pressure adjustment method includes washing the surface of the substrate concrete with high pressure water of 1-10 Mpa, and applying a water-based epoxy resin mortar composition of 0.5-2.7 kg/m, containing hydraulic cement, aggregate and a water-based epoxy resin, onto the substrate concrete having no floating water, the water-based epoxy resin mortar composition being a coating material composition in which the weight ratio of the hydraulic cement to water is 0.3-0.4, the weight of a resin solid component of the resin is 4-10% of the weight of all compound containing the water when the resin is formed by adding hardening agent to react with the epoxy resin to the epoxy resin, the total pore amount of a hardened material is 0.05-0.2 cc/g, and a T.I value is 1.0-1.5. The substrate concrete floor construction method applying the same is provided.

Description

  The present invention relates to a ground treatment method for finishing by applying a finish coating material such as a painted floor material on the surface of a ground concrete, and more particularly, to a concrete surface high pressure adjustment method and a ground concrete floor construction method using the ground surface.

  Conventionally, when finishing paint such as a flooring material is applied to the surface of the foundation concrete, if there is a latency or a fragile part on the surface of the foundation concrete, that part becomes an adhesion defect part between the finish coating material and the foundation concrete. Therefore, the state of the surface layer needs to be in a state in which there is no latency or a weak part (Non-Patent Document 1).

  In addition, when constructing the flooring material, the surface moisture of the ground concrete is measured using a high frequency electromagnetic induction moisture meter, Kett HI-500 or HI-520 (trade name, manufactured by Kett Science Laboratory Co., Ltd.), concrete thickness, It is necessary to dry sufficiently to 5.0% or less at 40 mm (Non-Patent Document 1).

Painted floor handbook 2006, 45 pages, edited by Japan Painted Floor Industry Association, published by Kobunsha Co., Ltd.

  However, in most cases, the foundation concrete before the application of the flooring material has a latency and a fragile part, and in addition to this, the surface of the foundation concrete is contaminated. Has a problem that the latency and the fragile part must be mechanically removed by a grinding machine as a base treatment.

In addition, the grinding machine is usually heavy and inconvenient to handle, and grinding dust is generated by grinding and fills the construction site. There are major issues such as harm. In addition, there is a vacuum suction mechanism that immediately attaches the dust so that the dust does not rise, or there is a type that collects dust together with the steel polishing material like a shot blasting machine. There is a problem that it is not practical in the construction area of the coated floor of about several tens of m ² .

Furthermore, since it is necessary to sufficiently dry the base concrete as described above, there is a problem that the surface treatment of the base concrete using water cannot be considered in common sense.

  The problem to be solved by the present invention is to remove latencies and fragile parts on the surface of the base concrete in a wet state and not contaminate the construction site with dust. In this method, the layance and the fragile part are removed so that the flooring material can be applied, and the finishing concrete surface applied with the coated flooring material is free from blistering due to moisture and the like. It is in providing the foundation concrete floor construction method which gave.

According to the first aspect of the present invention, the surface of the underlying concrete is washed with high pressure water of 2 Mpa or more and 10 Mpa or less to remove the latency of the underlying concrete, and the hydraulic cement, the aggregate, and the water-based epoxy resin are formed on the underlying concrete without floating water. A water-based epoxy resin mortar composition containing a hydraulic cement and water having a weight ratio of 0.3 to 0.4, wherein the epoxy resin is added with a curing agent that reacts with the epoxy resin. The resin solid content weight of the resin is 4% or more and 10% or less based on the weight of the total formulation including water, and the total pore amount of the cured product is 0.05 cc / g or more and 0.2 cc / g or less, T.A. It is a ground concrete surface high-pressure adjustment method characterized by applying 0.5 to 2.7 kg / m ² of a coating material composition having an I value of 1.0 to 1.5.

The invention according to claim 2 is characterized in that the water-based epoxy resin is obtained by blending a non-emulsifying type epoxy resin and a self-emulsifying type curing agent. It is.

  The invention according to claim 3 is the foundation concrete according to claim 1 or 2, characterized in that the viscosity immediately after mixing of the coating material composition is 0.3 Pa · s or more and 8 Pa · s or less / 23 ° C. This is a surface high pressure adjustment method.

  Invention of Claim 4 is the ground concrete surface high-pressure adjustment method in any one of Claim 1 thru | or 3 characterized by the hydraulic cement of the said coating material composition being white cement.

  The invention according to claim 5 is a solvent-free epoxy resin or solvent-free after the base concrete coating composition to which the ground concrete surface high-pressure adjusting method according to any one of claims 1 to 4 is applied is cured. It is a ground concrete floor construction method characterized by applying a finish coating material of a hard urethane resin.

  The foundation concrete surface high-pressure adjusting method according to the present invention and the foundation concrete floor construction method to which this is applied have an effect of removing the latency and the fragile portion on the surface of the foundation concrete in a wet state using water. For this reason, the construction site is not contaminated with dust, and it is possible to remove the latency and fragile parts with a simple and general-purpose machine such as a high-pressure washer so that the flooring material can be constructed. is there. High-pressure washing machines are generally readily available machines, are extremely inexpensive compared to the above grinding machines, are light in weight, and are easy to handle. There is an effect that can be performed quickly and easily.

  In particular, the invention described in claim 1 has an effect of preventing permeation of moisture rising from the base concrete to the back surface of the finish coating material, and does not cause problems such as peeling and swelling on the finish coating material. The object has the effect of having self-leveling properties.

  In addition to the above effects, the invention according to claim 2 is a mixture of a non-emulsifying type epoxy resin and a self-emulsifying type curing agent, and only water at the time of placing in the ground concrete. Even if the ground concrete is placed on landfills or cuts that are intermittently supplied with a large amount of water, the permeation of the water rising from the ground concrete to the back of the finish coating material is prolonged. This has the effect of preventing the occurrence of problems such as peeling and swelling on the finish coating material.

  In addition to the above effects, the invention according to claim 3 has a viscosity of 0.3 Pa · s or more and 8 Pa · s or less / 23 ° C. immediately after mixing the coating composition. Is good, has self-leveling properties, low viscosity and T.I. Since the I value is low, the fine bubbles that are involved when mixing hydraulic cement and water-based epoxy resin during construction are sufficiently broken before spreading the coating composition and before curing the coating composition And disappears.

  In addition to the above effects, the invention according to claim 4 is characterized in that the hydraulic cement of the coating material composition is white cement, which is more compact than the case of using ordinary Portland cement as the hydraulic cement, There is an effect that the color unevenness of the finish coating material to be layered is not conspicuous while having leveling properties.

  Further, the invention according to claim 5 has an effect that the finish coating material and the base have good adhesion, and the finish coating material does not have problems such as swelling.

  The present invention will be described in detail below.

  The foundation concrete surface high-pressure adjustment method and the foundation concrete floor construction method to which this is applied according to the present invention first wash the foundation concrete surface with high-pressure water of 2 Mpa or more and 10 Mpa or less. When the pressure of the high-pressure water is less than 2 MPa, the removal of the latency, the weak part, etc. is insufficient, and it takes a long time for the removal. If it exceeds 10 MPa, the latency removed together with the high-pressure water at the time of cleaning and the powder removed from the fragile portion will scatter and contaminate the surroundings. Even when high-pressure water of 10 MPa or less is used, it is preferable to cure with a vinyl sheet or the like in order to prevent surrounding contamination.

  After cleaning the surface of the foundation concrete with high-pressure water to remove latencies and fragile parts, confirm that there is no floating water on the foundation concrete. Remove.

  Thus, the method for adjusting the surface of the ground concrete surface of the present invention and the ground concrete floor construction method to which the surface concrete is applied, when the conventional coating material is constructed, the surface moisture of the ground concrete is converted to a high frequency electromagnetic induction moisture meter, Ket HI-500. Or concrete range of the same HI-520 (trade name, manufactured by Kett Science Laboratory Co., Ltd.), dry sufficiently to 5.0% or less at a concrete thickness of 40 mm (Painted floor handbook 2006, 45 pages, Nippon Painted Floor Industry) Contrary to the common general knowledge of those skilled in the art), the substrate is sufficiently dried as described above, and the latencies and fragile parts are mechanically removed with a grinder immediately before applying the floor. Contrary to the common general knowledge of those skilled in the art of ground preparation, which requires two steps, high-pressure water is used to wet the ground concrete. Is intended to adjust the base in one step of removing Reitansu or fragile portion of the underlying surface at the same time, more of not scattering the dust is a breakthrough as a surface conditioning method of the underlying concrete.

Next, a water-based epoxy resin mortar composition containing hydraulic cement, aggregate, and water-based epoxy resin is provided on the ground concrete without floating water, and the weight ratio of the hydraulic cement to water is 0.3 or more. 0.4 or less, when the resin is a resin obtained by adding a curing agent that reacts with the epoxy resin to the epoxy resin, the resin solid content weight of the resin is 4% or more with respect to the weight of the total formulation including water 10% or less, the total pore amount of the cured product is 0.05 cc / g or more and 0.2 cc / g or less. A coating material composition having an I value of 1.0 to 1.5 is applied to 0.5 to 2.7 kg / m ² . The coating material composition is a coating material composition described in Japanese Patent No. 4794007, and the weight ratio of hydraulic cement to water is the weight ratio of water / hydraulic cement and is generally referred to as W / C. Say what is being. The total amount of pores means the total amount of very small holes of several nanometers to several tens of micrometers in the coating composition, and the pore distribution is determined from the injection pressure and injection amount of mercury by the mercury intrusion method. This is the sum of the volume (pore volume) for each radius. T. T. et al. The I value is a value obtained by dividing the viscosity of 2 rpm of the BH type rotational viscometer by the viscosity of 20 rpm in accordance with the thixotropic index test method of JIS A6024. T. T. et al. When the I value is less than 1.0, the aggregate containing cement rapidly settles. When the I value exceeds 1.5, the self-leveling property is lowered, and a wave remains after it is applied with a scissors. The viscosity is the viscosity at No. 4 rotor at 20 rpm with a BH type viscometer, but if it is less than 0.3 Pa · s and more than 8 Pa · s, the wrinkle judgment becomes poor.

  The coating material composition has a fine pore structure after curing as shown in Japanese Patent No. 4794007, and its water permeability is not more than 0.2 ml. The absorbed water is confined by the coating material composition and contains hydraulic cement and epoxy resin, so that it has excellent adhesion to the ground concrete wetted with water.

  Further, the coating material composition is T.I. Since the I value is 1.0 to 1.5, there is self-leveling property, and the base before the finishing coating material such as a coating floor material is smoothed.

  In addition, about the coating material composition which concerns on Claim 2 thru | or 4, it is the same as that of the patent 4794007 gazette Claim 2 thru | or Claim 4 similarly to the said coating material composition.

  As described above, the water-based epoxy resin used in the coating composition which is a water-based epoxy resin mortar composition can be mixed with the epoxy resin described in Japanese Patent No. 4794007, and the water can be well dispersed. It refers to a mixture with a water-based curing agent that can be used, and the epoxy resin and water-based curing agent shown in this publication are used. As a commercially available product of epoxy resin, Jolieth JEX210A (epoxy resin manufactured by Aika Kogyo Co., Ltd., epoxy equivalent 180, solid content 100%, viscosity 0.7 Pa · s / 25 ° C.) is mentioned as specified in the publication. As a commercial product of a water-based curing agent and a self-emulsifying curing agent, as described in the publication, Jolie's JEX210B (epoxy resin curing agent manufactured by Aika Industry Co., Ltd., trade name, active hydrogen equivalent 750, solid 18% aqueous solution, viscosity 7 mPa · s / 25 ° C.).

  The hydraulic cement used in the coating composition, which is a water-based epoxy resin mortar composition, is a variety of Portland cements such as commercially available ordinary Portland cement, early-strength Portland cement, moderately hot Portland cement, sulfate-resistant Portland cement, and white Portland cement. Or mixed cement such as blast furnace cement, silica cement, fly ash cement, calcined aluminate cement, calcined aluminate calcareous cement, phosphoric acid cement or the like can be used. In particular, in the coating material composition, white cement, that is, white Portland cement, is preferable in terms of good fluidity.

  The aggregate used in the coating composition which is a water-based epoxy resin mortar composition may be any material that can be used by mixing with a hydraulic material. However, in order to have self-leveling properties, JIS G5901 Nos. 48 to 150 No. 1 is preferable, and since the blending component and blending amount are determined by the weight ratio of the hydraulic cement and water and the resin solid content weight with respect to the total solid weight, it is actually the remaining component. If aggregates have the same particle size, etc., the same effect can be obtained, but silica and sand are the optimal because of cost and availability. If it is finer than JIS G5901, No. 150, the viscosity will be high, and the self-leveling property and dredging workability will be reduced. Commercially available products include Tohoku silica sand Nos. 6 and 7 (North Japan Industrial Co., Ltd., trade name).

  As other materials, an AE water reducing agent can be blended with the coating composition which is an aqueous epoxy resin mortar composition, and the AE water reducing agent described in paragraph 0045 of Japanese Patent No. 4794007 is used. be able to.

  As the mixing form of the coating composition, which is a water-based epoxy resin mortar composition, the epoxy resin, water-based curing agent, water, hydraulic component, and aggregate are the main compounds. It is preferable in use. In other words, water-based curing agent and water, epoxy resin, aggregate and hydraulic component are preferable to prevent insufficient mixing / dispersion, deactivation of characteristics, measurement error / error, I do not care.

  In addition, as disclosed in Japanese Patent No. 4794007, the water-based epoxy resin mortar composition is a resin solid state of a resin obtained by adding a curing agent that reacts with the epoxy resin to the epoxy resin. The weight is 4% or more and 10% or less based on the weight of the total formulation including water, and the T.I. Since the I value is from 1.0 to 1.5, the handling during construction is good and the self-leveling property is good.

The coating amount of the coating material composition is 0.5 to 2.7 kg / m ² , more preferably 0.9 to 2.3 kg / m ² . If it is less than 0.5 kg / m ² , the water shielding effect of the cured coating composition will be insufficient, and the various coating floor materials, which are finishing materials applied on the cured coating composition, will swell due to moisture. If the adhesive strength is lower than 2.7 kg / m ² , for example, the paint composition divided into the main agent, hardener and aggregate is mixed at the construction site before construction. When the mixed foam is not pinched from the coating composition before curing, it becomes a pinhole and hardens, and the moisture in the ground concrete reaches the back surface of various coating floor materials that are finishing materials through the pinhole, Swelling occurs in the various coating floor materials.

When the coating amount is less than 0.9 kg / m ² , there is a tendency that the water shielding effect due to the cured coating composition is insufficient, and it is a finishing material applied on the cured coating composition There is a tendency for various flooring materials to swell due to moisture and to reduce adhesion. When the coating composition exceeds 2.3 kg / m ² , for example, the coating composition in which the mixed foam is mixed before the construction is divided into the main agent, the curing agent and the aggregate at the construction site before the construction is cured. There is a tendency to harden as a pinhole without passing through the inside, and the moisture in the ground concrete reaches the back of the various coated flooring materials through the pinhole, and the various coated flooring materials swell Tend.

After the coating material composition is cured, it is possible to apply finishing materials such as various coating floor materials as well as finishing coating materials of solventless epoxy resins and solventless urethane resins. Solvent-free epoxy resin and solvent-free urethane resin finishes are applied with a thick film of 0.5 mm or more, and if applied directly to the base concrete, swelling may occur due to moisture contained in the base concrete. Often, such a problem does not occur in the method for adjusting the surface of the foundation concrete surface according to the present invention and the method for constructing the foundation concrete floor using the method.

In addition to solvent-free epoxy resin and solvent-free urethane resin finish coating materials, for example, solvent-based and water-based finish coating materials with a coating thickness of less than 0.5 mm, it swells even when applied directly to the underlying concrete. Rarely occurs, but adhesion may be reduced. However, if it is applied on the coating composition subjected to the method for adjusting the surface of the ground concrete surface according to the present invention, it will not be affected by the moisture contained in the ground concrete, and the adhesion will not decrease.

  Hereinafter, the concrete concrete surface high pressure adjustment method according to the present application and the concrete concrete floor construction method using the same will be described in detail with reference to Examples and Comparative Examples.

Example 1 to Example 6
A concrete having a weight ratio of hydraulic cement to water of 0.8 is cast into a cylindrical shape of φ200 × 150 mm to prepare a material having a material age of 28 days. Using the high pressure washer Kercher K5.600 (trade name, manufactured by Kercher Japan, Nozzle: Cyclone Jet Nozzle), the ground concrete whose surface was washed with high pressure water at pressures of 2 MPa, 5 MPa, and 8 MPa was prepared. Use a rag to wipe off the remaining floating water after high pressure cleaning. Immediately after that, the stirrer was charged with 100 parts by weight of Jolie's JEX210A, 400 parts by weight of Jolie's JEX210B, 1265 parts by weight of silica sand (JIS silica sand No. 100), 2120 parts by weight of white cement (Pacific Cement Co., Ltd., White Portland Cement), and water 415. Mixing parts by weight and mixing 5 parts by weight of Melflux AP101F (manufactured by Degussa Construction Co., Ltd., modified polycarboxylic acid-based water reducing agent, trade name) when mixing silica sand and white cement, weight of hydraulic cement and water Ratio 0.35, resin solids weight 4% with respect to total solids weight, viscosity 0.7 Pa · s / 23 ° C. A coating material composition having an I value of 1.3 (Example 7 in Japanese Patent No. 4794007) is applied at a coating amount of 0.9 kg / m ² . As shown in Japanese Patent No. 4794007, the coating material composition has a total pore amount of a cured product of 0.15 cc / g. 1 day after application, as solvent-free epoxy resin finish coating material, solvent-free epoxy coating flooring material Jolies JE20 (made by Aika Industry Co., Ltd., trade name) with 5% benzyl alcohol added as a diluent (compression) A low strength product having a strength of ² N / mm ² was applied to a thickness of 1 mm, and concrete was washed with high pressure water at a pressure of 2 MPa. Example 1 was washed with high pressure water at a pressure of 5 MPa. Example 2 What was washed with high-pressure water at a pressure of 8 Mpa was designated as Example 3. Similarly, the coating material composition was applied at a coating amount of 0.9 kg / m ² , and one day after application, the solventless hard urethane flooring fabric Fabrica JJ- 103 (made by Aika Kogyo Co., Ltd., trade name) was applied to a thickness of 1 mm, and concrete was washed with high-pressure water with a pressure of 2 MPa. Example 4 was washed with high-pressure water with a pressure of 5 MPa. Example 5 Example 6 was washed with high-pressure water at a pressure of 8 Mpa.

Example 7 to Example 12
Examples 7, 8 and 9 were the same as Examples 1, ² and 3 except that the coating composition was changed to 1.8 kg / m ^{2 in} Examples 1, 2 and 3. , 12 were the same as in Examples 4, 5, and 6 except that the coating amount of the coating composition was 1.8 kg / m ^{2 in} Examples 4, 5, and 6.

Example 13 and Example 18
Examples 13, 14, and 15 were the same as Examples 1, ^2, and 3 except that the coating amount of the coating material composition was changed to 2.3 kg / m ^{2 in} Examples 1, 2, and 3. , 18 were the same as those of Examples 4, 5, and 6 except that the coating amount of the coating composition was 2.3 kg / m ^{2 in} Examples 4, 5 and 6.

Comparative Examples 1 to 18
Comparative Example 1 is the same as in Example 1 except that the ground concrete was not washed with high-pressure water and the surface was polished with sandpaper # 120 to remove the surface latency, and then the coating composition of Example 1 was immediately applied. Is the same as Example 1, and Comparative Example 2 to Comparative Example 18 are also surfaced with sandpaper # 120 without washing the foundation concrete in Example 2 to Example 18 with high-pressure water, respectively, as in Comparative Example 1. After removing the surface latency, the same procedures as in Examples 2 to 18 were carried out except that the coating material compositions of Examples 2 to 18 were applied immediately.

Evaluation items and evaluation methods

Anti-blowing resistance From the upper surface of the specimens of Examples 1 to 18 and Comparative Examples 1 to 18, leave 10 mm and soak in warm water at 30C for 28 days. Observe the state of the blisters generated visually and copy the blisters onto a transparent sheet. The center 100φ portion is defined as a blister observation site, and the blister area generated in the 100φ portion is divided by the area of the 100φ portion to obtain a blister area%. If the blister area% is 1% or more, x is indicated. Otherwise, ○ is indicated.

Evaluation results In Examples 1 to 18, no slight blistering occurred, and the evaluation was good, but in Comparative Examples 1 to 18 where the surface of the underlying concrete was not washed with high-pressure water, Swelling occurred and was evaluated as x.

Claims (5)

A water-based epoxy resin mortar composition containing a hydraulic cement, an aggregate, and a water-based epoxy resin on a ground concrete without floating water, wherein the surface of the ground concrete is washed with high-pressure water of 2 Mpa or more and 10 Mpa or less. The weight ratio of water is 0.3 or more and 0.4 or less, and the resin solid content weight of the resin when the epoxy resin is added with a curing agent that reacts with the epoxy resin is the total formulation including water 4% to 10% of the weight of the product, the total pore amount of the cured product is 0.05 cc / g to 0.2 cc / g, A ground concrete surface high-pressure adjusting method, wherein a coating material composition having an I value of 1.0 to 1.5 is applied in an amount of 0.5 to 2.7 kg / m ² .   The method for adjusting the surface of a ground concrete surface according to claim 1, wherein the water-based epoxy resin is a mixture of a non-emulsifying type epoxy resin and a self-emulsifying type curing agent. The foundation concrete surface high-pressure adjusting method according to claim 1 or 2, wherein a viscosity immediately after mixing of the coating material composition is 0.3 Pa · s or more and 8 Pa · s or less / 23 ° C.   The foundation concrete surface high-pressure adjusting method according to any one of claims 1 to 3, wherein the hydraulic cement of the coating material composition is white cement. A finishing coating material of a solventless epoxy resin or a solventless hard urethane resin after the coating material composition of the foundation concrete to which the foundation concrete surface high pressure adjusting method according to any one of claims 1 to 4 is applied is cured. A foundation concrete floor construction method characterized by applying