JP2013217031A - Substrate concrete surface adjustment method and substrate concrete floor construction method applying the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a substrate concrete surface adjustment method for forming a sound coated floor while maintaining good adhesiveness over a long period without causing swollenness in various floor coating materials applied onto a coating material composition due to moisture supplied from a substrate concrete, and to provide a substrate concrete floor construction method applying the same.SOLUTION: The substrate concrete surface adjustment method includes spraying water on the surface of the substrate concrete, 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 on the surface, 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.

Description

  The present invention applies a coating composition, which is a water-based epoxy resin mortar composition containing hydraulic cement, aggregate, and water-based epoxy resin to the floor concrete surface, so-called foundation adjustment, and then a solvent-based, solvent-free epoxy. In addition to resin flooring, solvent-based and solvent-free urethane resin flooring, various concrete flooring materials such as polyester, vinyl ester, and acrylic are coated and finished, and a method for adjusting the surface of the underlying concrete. The present invention relates to a method for constructing an underlying concrete floor.

  Conventionally, a water-based epoxy resin mortar composition containing hydraulic cement, aggregate and water-based epoxy resin on the floor concrete surface, the weight ratio of hydraulic cement to water being 0.3 to 0.4, The resin solid weight of the resin when added with a curing agent that reacts with the epoxy resin is 4% or more and 10% or less with respect to the weight of the total formulation including water. Pore amount is 0.05 cc / g or more and 0.2 cc / g or less, T.I. A concrete floor construction method for applying a coating material composition having an I value of 1.0 to 1.5 has been proposed (Patent Document 1).

Japanese Patent No. 4794007

  However, the coating composition disclosed in Patent Document 1 has a hydraulic cement / water weight ratio of 0.3 to 0.4, for example, concrete cement and water weight generally placed on the floor. Compared with the ratio of about 0.5 to 0.6, the weight ratio of the cement and water is small, and the amount of water blended in the coating material composition is small accordingly. For this reason, if the pore structure on the surface of the underlying concrete to which the coating composition is applied is rough, or if the amount of water present in the pore structure is small, the water contained in the coating composition After the coating composition was invented, some of it moved into the surface of the underlying concrete, and as a result, there seemed to be slight voids that could not be observed visually in the coating composition cured by the moved moisture. As a result of consideration based on the results of long-term construction by the inventor, this was inferred, and this was considered as a problem.

  The problem to be solved by the present invention is that the coating composition shown in Patent Document 1 is affected by the density of the pore structure on the surface of the underlying concrete to which the finishing material is applied and the presence or absence of moisture. There are no voids in the composition that cannot be observed with the naked eye. For this reason, blistering due to the moisture supplied from the ground concrete occurs on the various coating floors applied on the coating composition. Therefore, an object of the present invention is to provide a method for adjusting the surface of a ground concrete that maintains good adhesion over a long period of time and provides a sound painted floor, and a method for constructing a ground concrete floor using this method.

The invention according to claim 1 is a water-based epoxy resin mortar composition containing water-based cement, aggregate, and water-based epoxy resin on the ground concrete without water floating on the surface of the ground concrete, The weight ratio of the hydraulic cement to water is 0.3 to 0.4, and the resin solid content weight of the resin obtained by adding a curing agent that reacts with the epoxy resin to the epoxy resin is water. 4% or more and 10% or less based on the weight of the total formulation included, the total pore amount of the cured product is 0.05 cc / g or more and 0.2 cc / g or less, It is a ground concrete surface 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 a mixture of a non-emulsifying type epoxy resin and a self-emulsifying type curing agent. is there.

  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 adjustment method.

  The invention according to claim 4 is the foundation concrete adjusting method according to any one of claims 1 to 3, wherein the hydraulic cement of the coating material composition is white cement.

  The invention according to claim 5 is a solvent-free epoxy resin or solvent-free system after the base concrete coating material composition to which the surface concrete surface adjustment method according to any one of claims 1 to 4 is applied is cured. A foundation concrete floor construction method characterized in that a finish coating material of urethane resin is applied.

  The ground concrete surface conditioning method according to the present invention and the ground concrete floor construction method using the ground concrete surface coating method are applied even when the pore structure of the ground concrete surface on which the finishing material is to be constructed is rough and moisture is not present. There is an effect that voids that cannot be visually observed in the material composition are not generated. In addition, due to this effect, various flooring materials applied on the coating composition do not swell due to moisture supplied from the base concrete, maintain good adhesion over a long period of time, There is an effect that can be done.

  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 thing is T. The I value is as low as 1.0 to 1.5, and there is an 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 surface concrete surface adjustment method of the present invention and the surface concrete floor construction method to which this is applied, when the conventional flooring material is applied, the surface moisture of the ground concrete is converted to high frequency electromagnetic induction moisture meter, Ket HI-500 or HI- 520 (trade name, manufactured by Kett Science Laboratory Co., Ltd.), with a concrete thickness of 40 mm, fully dried to 5.0% or less (Coated floor handbook, 2006, 45 pages, Japan Painted Floor Industry Association, Inc.) Contrary to the technical common knowledge of those skilled in the art (published by Kobunsha Co., Ltd.), water is first sprayed on the surface of the underlying concrete. The amount of water to be sprayed varies depending on the density of the structure on the surface of the foundation concrete, the presence or absence of moisture before spraying, and the amount of moisture before spraying. preferable. When a puddle such as floating water has been formed, the water remaining in the puddle is removed with a waste cloth or a vacuum cleaner.

A water-based epoxy resin mortar composition comprising a hydraulic cement, an aggregate, and a water-based epoxy resin, wherein the weight ratio of the hydraulic cement to water is 0.3 to 0.4, and the epoxy resin is mixed with the epoxy resin. The resin solid content weight of the resin when added with a curing agent that reacts with the resin is 4% to 10% with respect to the weight of the total formulation including water, and the total pore amount of the cured product 0.05 cc / g or more and 0.2 cc / g or less, T.I. A coating material composition having an I value of 1.0 to 1.5 is applied by 0.5 to 2.7 kg / m ² and cured. 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, generally W / C and Say what is called. 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 specified in Japanese Patent No. 4794007, and its water permeability in the JIS A 6909 water permeability test B method is 0.2 ml or less. The water absorbed on the concrete surface is confined by the coating composition and contains hydraulic cement and epoxy resin, and therefore 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-blocking effect of the cured coating composition is insufficient, and swells due to moisture occur in various coating floor materials that are finishing materials applied on the cured coating composition. However, if the adhesive strength is reduced and the 2.7 kg / m ² is exceeded, for example, a mixed foam when the coating composition divided into the main agent, the curing agent and the aggregate before construction is mixed at the construction site. However, it is hardened as a pinhole without being completely removed from the coating composition before curing, and the moisture in the ground concrete reaches the back surface of the various coating floor materials as finishing materials through the pinhole, and the various coating floors Swelling occurs in the material.

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.

  Hereinafter, the concrete concrete surface preparation method according to the present application and the concrete concrete floor construction method using the same will be described in detail in Examples and Comparative Examples.

Example 1 and Example 2
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. Before spraying water, measure the surface moisture of the ground concrete, 5.0% at Ket moisture meter HI-500 or HI-520 (trade name, manufactured by Kett Science Laboratory Co., Ltd.), concrete thickness 40mm Make sure that: Next, after polishing the surface of the ground concrete with sandpaper # 120 to remove the surface latency, water is sufficiently sprayed until a slight amount of floating water is generated on the ground concrete surface with a sprayer. Use a waste cloth to wipe off the remaining floating water after spraying. 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 to obtain Example 1. 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- Example 2 was prepared by applying 103 (manufactured by Aika Kogyo Co., Ltd., trade name) to a thickness of 1 mm.

Example 3 and Example 4
Example 3 was the same as Example 1 except that the coating amount of the coating composition was 1.8 kg / m ^{2 in} Example 1, and Example 4 was a coating amount of 1 in Example 2. except that the .8kg / ^{m 2} were the same as in example 1.

Example 5 and Example 6
Example 5 was the same as Example 1 except that the coating amount was 2.3 kg / m ^{2 in} Example 1, and Example 6 was a coating amount of 2 in Example 2. It was the same as Example 1 except that it was ³ kg / m ² .

Comparative Examples 1 to 6
Comparative Example 1 was the same as in Example 1 except that the surface concrete was polished with sandpaper # 120 without spraying water on the ground concrete to remove the surface latency, and then the coating composition of Example 1 was applied immediately. The same as Example 1, and Comparative Example 2 is the same as Example 2, after the surface was polished with sandpaper # 120 without spraying water on the ground concrete to remove the surface latency, and immediately after, the coating composition of Example 2 Example 3 was the same as Example 2 except that the material was applied, and Comparative Example 3 was immediately after the surface latency was removed by sandpaper # 120 without spraying water on the ground concrete in Example 3, and immediately after removing the surface latency. Example 3 was the same as Example 3 except that the coating material composition of Example 3 was applied. In Comparative Example 4, the surface was polished with sandpaper # 120 without spraying water on the ground concrete in Example 4, and the surface was polished. Removes latency After that, it was the same as Example 3 except that the coating composition of Example 4 was applied immediately, and Comparative Example 5 was polished with sandpaper # 120 without spraying water on the ground concrete in Example 5. Then, after removing the surface latency, it was the same as Example 5 except that the coating composition of Example 5 was applied immediately. Comparative Example 6 was sandpaper without spraying water on the ground concrete in Example 6. After the surface was polished by # 120 to remove the surface latency, the same procedure as in Example 6 was performed except that the coating material composition of Example 6 was immediately applied.

Evaluation items and evaluation methods

Anti-blowing resistance From the upper surface of the specimens of Examples 1 to 6 and Comparative Examples 1 to 6, leave 10 mm and soak in warm water at 30 ° C. 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 6, there was no slight blistering and the evaluation was good, but in Comparative Examples 1 to 6 where water was not sprayed on the ground concrete surface, it was slightly Swelling occurred and was evaluated as x.

Claims (5)

A water-based epoxy resin mortar composition containing hydraulic cement, aggregate, and water-based epoxy resin on the ground concrete without water floating on the surface of the ground concrete, the weight ratio of hydraulic cement to water 0.3 to 0.4, and the resin solid content weight of the resin obtained by adding a curing agent that reacts with the epoxy resin to the epoxy resin is the weight of the total formulation including water. 4% or more and 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 method for adjusting the surface of a ground concrete, comprising applying a coating material composition having an I value of 1.0 to 1.5 in an amount of 0.5 to 2.7 kg / m ² .   The method for adjusting the surface of a ground concrete 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 conditioning 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 ground concrete adjusting method according to any one of claims 1 to 3, wherein the hydraulic cement of the coating material composition is white cement. After the ground concrete coating material composition to which the ground concrete surface conditioning method according to any one of claims 1 to 4 has been cured, a finish coating material of a solventless epoxy resin or a solventless urethane resin is applied. A foundation concrete floor construction method characterized by being applied.