JP5460956B2 - Coating composition, concrete anticorrosion construction method, and concrete anticorrosion structure thereby - Google Patents

Description

  The present invention relates to a coating composition for use in the preparation of a base for a corrosion-resistant lining material having chemical resistance applied for the protection of concrete structures such as water treatment facilities, agricultural settlement drainage facilities, sewerage treatment facilities, and the like. The present invention relates to a concrete anticorrosion construction method using a coating material composition and a concrete anticorrosion structure formed thereby.

  Conventionally, lining materials made of vinyl ester resin coating have been used for anti-corrosion in tanks such as water tanks for concrete structures such as water treatment facilities, agricultural settlement drainage facilities, and sewerage treatment facilities when high chemical resistance is required. It is constructed, and lining materials are being constructed with epoxy resin coatings in water tanks for waterworks. However, the foundation concrete on which these coating materials are applied is difficult to ensure a sufficient curing and drying period due to the shortened construction period. In many cases, when the lining material is applied in this state, peeling or blistering may occur after the application. In particular, when a lining material made of a vinyl ester resin coating material was applied, the peeling from the base was remarkable due to the curing shrinkage of the coating material.

  On the other hand, after forming an undercoat adjustment layer made of a mixture of a reaction-curing epoxy resin emulsion and hydraulic cement on the undersurface with surface seepage water pressure in a building structure made of concrete, mortar, etc. In the construction method of the moisture-proof / waterproof layer, characterized in that a rapid reaction type elastic epoxy resin coating is applied on the adjustment layer, the mixture for the base adjustment layer has a solid content of 25% or more of the epoxy resin emulsion. The mixture of hydraulic cement in the range of 400 to 200% by weight with respect to the moisture of the resin emulsion reacts with the moisture that is the dispersion medium of the epoxy resin emulsion, and promotes film formation of the emulsion. Moisture that exudes from the surface is adsorbed and retained during the hydration process, reducing the effect of surface exudation water pressure and ensuring homogeneity with the substrate. Because, it is disclosed that enhancing the adhesion of the base adjustment layer (Patent Document 1).

  Also, a two-component reactive epoxy resin that can be emulsified on the concrete surface or an epoxy resin mixture that can be reacted in the presence of alkaline water, a room temperature-curable epoxy resin mixture, or a fine aggregate, cement, water, and the like A concrete surface layer strengthening method in which the composition is firmly bonded to the ground concrete is disclosed by applying a mixture of the above to a concrete of an arbitrary age immediately after casting the concrete. (Patent Document 2).

In addition, (A) the base conditioner contains an epoxy resin and an amine-based curing agent and aggregate having self-emulsifying properties, and (B) the primer agent includes an epoxy resin and an amine-based curing agent and filler having self-emulsifying properties. (C) The top coat material contains an epoxy resin, an amine-based curing agent, a filler, a diluent, and a layered thixotropic agent. An excellent substrate preparation material, primer material, and topcoat material are disclosed (Patent Document 3).
Japanese Patent Publication No. 3-79494 JP-A-7-187860 JP 2004-136525 A

  In Patent Document 1, the hydraulic cement mixed with the epoxy resin emulsion adsorbs and retains the water that exudes from the base during the hydration reaction, thereby reducing the effect of surface exudation water pressure. Even if it has a high water content immediately after placement, the surface reinforcing layer has sufficient adhesion, and the coating material is dried in order by applying the substrate preparation material, primer material, and topcoat material disclosed in Patent Document 3. It is said that a coating film excellent in adhesiveness and anticorrosiveness can be obtained by recoating at this point.

  However, even if the foundation adjustment layer, surface reinforcing layer, or substrate conditioner (hereinafter referred to as the foundation adjustment layer) applied to the concrete surface shown in these documents is excellent in the initial adhesiveness to concrete, If the concrete contains a large amount of free water or if moisture continues to be supplied to the concrete for some reason, blistering may occur in the top coat, which is the finish coating material, and in the long-term, the base is adjusted. In some cases, moisture in the concrete permeated into the layer, resulting in a decrease in adhesiveness with the top coat, and peeling of the top coat.

  In particular, in the case of vinyl ester resin coating materials, where the top coat causes curing shrinkage and a large peeling stress is likely to occur at the adhesion interface with the base, the strength of the base adjustment layer is not originally sufficient, and then within the base adjustment layer When the moisture exudes to the surface, the strength of the base adjustment layer is further reduced. For this reason, the surface layer of the base adjustment layer may be broken and the top coat may be peeled off together with the surface layer of the base adjustment layer.

  The problem to be solved by the present invention is that it is excellent in adhesiveness, toughness, and moisture permeation from the foundation concrete even immediately after demolding of the concrete formwork or even in a high moisture content concrete foundation such as young age concrete. It is providing the coating material composition and concrete anticorrosion construction method which prevent a corrosion, and the concrete anticorrosion structure by it.

The invention according to claim 1 is a water-based epoxy resin mortar composition containing hydraulic cement, aggregate, water-based epoxy resin, water reducing agent, and viscoelasticity modifier, wherein the weight ratio of water to hydraulic cement is 0.3. 1 to 0.4: 1, the resin solid weight is 4% to 10% with respect to the total solid weight, and the water reducing agent is 0.1 to 1 weight with respect to 100 parts by weight of hydraulic cement. The viscoelasticity adjusting agent is 0.05 to 0.15 parts by weight with respect to 100 parts by weight of the hydraulic cement, and the total pore amount of the cured product is 0.05 cc / g or more and 0.2 cc / g or less. The viscosity immediately after mixing is 5 Pa · s to 40 Pa · s / 23 ° C. and T.I. An I value of 4.0 to 7.0, a water permeability of the water permeability test B method of JISA 6909 is 0.2 ml or less, and one powder composed of hydraulic cement, aggregate, water reducing agent, and viscoelasticity modifier; A coating composition characterized by comprising one liquid epoxy resin liquid and one liquid water-based curing agent and water, having excellent adhesion, toughness, and rising from the underlying concrete Prevents moisture from penetrating to the back of the lining material, does not cause problems such as peeling or swelling on the lining material, has a good grip, and does not cause sagging even when applied to a vertical surface.

The invention according to claim 2 is the coating material composition 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, and is particularly placed in the ground concrete. Even if the ground concrete is placed on landfills or cuts where coastal water is intermittently supplied in addition to the moisture at the time, moisture rising from the ground concrete is applied to the back of the lining material. Permeation is prevented over a long period of time, and it does not cause problems such as peeling off and swelling on the lining material.

The invention according to claim 3 is the coating material composition according to claim 1 or 2 , characterized in that the hydraulic cement is white cement. Sauce does not occur.

According to a fourth aspect of the invention, the coating composition according to any one of the first to third aspects is applied to a concrete surface and cured, and after applying a one-component moisture-curing urethane primer, a vinyl ester It is a concrete anticorrosion method characterized by lining a resin coating material, has good adhesion to the lining material and the base, and does not cause problems such as swelling in the lining material.

The invention according to claim 5 is a concrete anticorrosion construction characterized in that the coating material composition according to any one of claims 1 to 3 is applied to a concrete surface and cured, and an epoxy resin coating is lined. This method has good adhesion to the lining material and the base, and does not cause problems such as swelling in the lining material.

The invention according to claim 6 is the concrete anticorrosion construction method according to claim 4 or 5 , characterized in that the concrete is a young age concrete of 1 day to 10 days after placing. The construction period from the lining material to the end of the lining material construction is short, it has good adhesion to the lining material and the groundwork, and the lining material does not suffer from peeling problems.

The invention according to claim 7 is the vinyl ester after the coating material composition according to any one of claims 1 to 3 is applied to the concrete surface and cured, and a one-part moisture-curing urethane primer is applied. It is a concrete anticorrosion structure characterized by lining a resin coating material, and it has a tough concrete anticorrosion structure that does not cause defects such as blistering in the lining material.

The invention according to claim 8 is a concrete anticorrosion structure characterized in that the coating material composition according to any one of claims 1 to 3 is applied to a concrete surface and cured, and an epoxy resin coating is lined. Therefore, it becomes a strong concrete anticorrosion structure that does not cause defects such as blistering in the lining material.

The invention according to claim 9 is the concrete anticorrosive structure according to claim 7 or 8 , characterized in that the concrete is a young age concrete of 1 day or more and 10 days or less after pouring. Even if it is on high-age young concrete, it becomes a tough concrete anticorrosion structure that does not cause problems such as swelling in the lining material.

The coating material composition of the present invention is a water-based epoxy resin mortar composition containing a hydraulic cement, an aggregate, a water-based epoxy resin, a water reducing agent, and a viscoelasticity modifier, and the weight ratio of water to the hydraulic cement is 0. When the resin solid content weight is 3% or more and 0.4: 1 or less, and the resin solid content weight is 4% or more and 10% or less with respect to the total solid content weight, the total pore amount of the cured product after curing is 0.00. 05cc / g or more and 0.2cc / g or less, which has high adhesion to the base concrete and the lining material to be layered, and prevents the water rising from the base concrete from permeating to the back of the lining material, It has a tough concrete anticorrosion structure, and there are no problems such as peeling or swelling in the lining material. Here, 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. The total volume (the amount of pores) is summed up.

As for the total solid weight, the present invention is a mixture of hydraulic cement, and the weight ratio of water to hydraulic cement is at least 0.3: 1 to 0.5: 1 . Because it is a composition, most of the water contained in the water-based epoxy resin is consumed in the hydration of the hydraulic cement and becomes crystal water, so the weight of the total formulation including water is the total solid weight. It was.

  The coating composition of the present invention has a viscosity immediately after mixing of 5 Pa · s to 40 Pa · s / 23 ° C. When the I value is 4.0 to 7.0 and the resin solid content weight is 4% or more and 10% or less, it is easy to handle, and no sagging occurs even when applied to a vertical surface. Further, when the hydraulic cement is white cement, the coating composition of the present invention is entirely white, and even when a light-colored lining material is applied to the upper layer, the color unevenness of the lining material is not noticeable. Good judgment.

  Furthermore, by applying a primer after applying the coating composition of the present invention to concrete, and further lining the vinyl ester resin coating material, the adhesion to the lining material and the base is good, and the lining material is swollen or peeled off It becomes a tough concrete anticorrosion structure that does not cause such defects.

  In addition, the coating composition of the present invention has sufficient adhesion even when the foundation concrete is younger than 10 days after placement, and allows the moisture rising from the foundation concrete to permeate the back of the lining material. Therefore, the lining material is not swollen or peeled off, and a strong concrete anticorrosive structure is maintained over a long period of time. In addition, the concrete of the young age here means the concrete in which the concrete has a high surface moisture content in addition to the concrete being put in the concrete for 10 days or less, for example, a ket moisture meter HI-520 ( (Measurement range: concrete range) means 8% or more concrete.

  The water-based epoxy resin mortar composition of the present invention is a coating composition that modifies the surface of the base concrete by applying it to the surface of the base concrete, and by stirring and mixing the liquid epoxy resin and the water-based curing agent. The dispersion composition forcibly emulsified is mixed with hydraulic cement, aggregate, water reducing material and viscoelasticity modifier.

  In the coating composition of the present invention, when the total pore amount of the cured product is 0.05 cc / g or more and 0.2 cc / g or less, the void is extremely small and there is no continuous conduit. Therefore, moisture is not supplied to the back surface of the vinyl ester resin coating material or epoxy resin coating material, which is a lining material, and osmotic pressure as a driving force for blistering does not occur.

  Further, the coating material composition of the present invention having a resin solid content weight ratio with respect to the total solid weight weight of 4% or more and 10% or less has good adhesion and is a primer, a vinyl ester resin coating material or an epoxy resin coating material. Adhesive enough with the line material.

  Furthermore, when applying an epoxy resin lining material, a generally required primer is unnecessary, and the epoxy resin lining material can be directly applied to the surface of the coating material composition of the present invention. In addition, it is preferable to roughen the surface of the coating material composition which is this invention in the case of application | coating.

  The epoxy resin of the present invention may be liquid and can be cured at room temperature. Bisphenol A type epoxy resin, bisphenol F type epoxy resin, phenol novolac type epoxy resin, bisphenol AD type epoxy resin, biphenyl type epoxy resin, naphthalene Type epoxy resin, cycloaliphatic epoxy resin, glycidyl ester type epoxy resin, glycidyl amine type epoxy resin, heterocyclic epoxy resin, diaryl sulfone type epoxy resin, hydroquinone type epoxy resin and their modified products, either alone or in combination Alternatively, it may be liquefied using a diluent. Preferably, the epoxy resin is not emulsified in water and insoluble, and this is referred to as a non-emulsifying type in the present application. The softening point of the epoxy resin to be blended most is preferably 35 ° C. or less, and as such a liquid epoxy resin, a liquid bisphenol A type epoxy resin is suitable in view of versatility and cost. Examples of commercially available products of these epoxy resin compositions include Joliace JEX210A (epoxy resin manufactured by Aika Kogyo Co., Ltd., trade name, epoxy equivalent 180, solid content 100%, viscosity 0.7 Pa · s / 25 ° C.).

  The aqueous curing agent of the present invention may be any one that can be mixed with the epoxy resin and can disperse water well. The following aliphatic polyamines and alicyclic polyamines are selected and used alone or in combination. To do.

  An aliphatic polyamine is an aliphatic compound having at least two amino groups and imino groups in the molecule, and is diethylenetriamine, triethylenetetramine, tetraethylenepentamine, pentaethylenehexamine, diethylaminopropylamine, hexamethylenediamine, trimethylhexa There are methylenediamine, polyoxypropylenediamine, iminobishexylamine, and the like.

  The alicyclic polyamine is an alicyclic compound having at least two amino groups and imino groups in the molecule, and xylylenediamine, 3,9bis (3-aminopropyl) -2,4,8,10 tetra. There are oxaspiro [5,5] undecane, N-aminoethylpiperazine, bis (4-aminocyclohexyl) methane and the like.

  In addition, a self-emulsifying curing agent in which a hydrophilic main chain such as polyether is introduced into an epoxy resin and an excess amine is reacted, an ethylene oxide adduct of an aliphatic polyamine, an epoxy resin adduct, a polyethylene polyamine modified product, etc. Modified Aliphatic Polyamines and Alicyclic Polyamine Monoglycidyl Ether Adducts, Epoxy Resin Additives, Acrylonitrile Adducts, Phenol Formalin Modified Products (Mannich Modified Products), Fatty Acid Glycidyl Ether Adducts Modified Alicyclic Polyamines and Polyethylene Examples include polyamidoamines which are condensation reaction products such as fatty acids to polyamines, dimer acids to polyethylene polyamines, xylylenediamine-dimer acids, and modified products thereof. As an example of a commercial product of the self-emulsifying curing agent, there is Jolie's JEX210B (epoxy resin curing agent manufactured by Aika Industry Co., Ltd., trade name, active hydrogen equivalent 750, solid content 18% aqueous solution, viscosity 7 mPa · s / 25 ° C.). .

  In the present invention, as a primer to be applied to the coating composition cured when the vinyl ester resin is lined, a generally known primer can be used. For example, a one-part moisture curable urethane primer, a room temperature curable epoxy primer, an unsaturated polyester. System primers.

  The coating material composition of the present invention has a resin solid content weight of 4% to 10% and a viscosity immediately after mixing of 5 Pa · s to 40 Pa · s / 23 ° C. at 23 ° C. Although the I value is 4.0 to 7.0 and the wiping is good, there is no sagging even when applied to a vertical surface. 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.A. When the I value is 4.0 to 7.0, sagging does not occur when applied to a vertical surface, and workability is good. Viscosity of BH-type rotational viscometer with No. 6 rotor at 20 rpm (however, when the viscosity is 50 Pa · s or more, No. 7 rotor at 20 rpm) If the viscosity is less than 5 Pa · s and more than 40 Pa · s, the crispness is poor. .

  The hydraulic component is cement or hydraulic pozzolan, and the cement is not particularly limited as long as it is a hydraulic cement. Various Portland cements such as ordinary Portland cement, early-strength Portland cement, moderately hot Portland cement, sulfate-resistant Portland cement, white Portland cement, mixed cements such as blast furnace cement, silica cement, fly ash cement, calcined aluminate, silica Examples include acid aluminate calcareous cement and phosphate cement. White cement, that is, white Portland cement, is preferable in terms of good fluidity. Examples of hydraulic pozzolans include metakaolin. Commercially available metakaolin is Metamax HRM (Degussa Construction Co., Ltd., trade name).

Water reducing agents include anionic, nonionic, cationic or amphoteric AE agents and lignin sulfonates, sulfonates of higher polyhydric alcohols, oxyorganic acids, alkylaryl sulfonates, polyoxys A water reducing agent of ethylene alkyl ether, polycarboxylic acid or polyol complex, or a complex or mixture thereof can be used, but the modified polycarboxylic acid or polyether / polycarboxylic acid is most effective. There is a high-performance AE water reducing agent. Melflux AP101F (Degussa Construction Co., Ltd., trade name) is an example of a commercial product of a modified polycarboxylic acid-based AE water reducing agent, and Mellux2641F ((Co., Ltd.) is an example of a commercial product of a polyether / polycarboxylic acid-based high-performance AE water reducing agent ) Degussa Construction, trade name). These AE water reducing agent reduces the viscosity of the coating material composition on to sufficiently disperse the hydraulic cement by blending 1 part by weight from 0.1 parts by weight per 100 parts by weight of hydraulic cement, following Further blending the viscoelasticity adjusting agent shown in FIG. It can be adjusted to I value.

The viscoelasticity modifier is blended for the purpose of preventing sagging of the coating composition, and is generally inorganic, metal soap, natural product, cellulose derivative, polycarboxylic acid, polyether derivative, polyvinyl. In the present invention, the polymer type having a strong polymer network structure is most preferred. As a commercially available viscoelasticity adjusting agent, there is a polymer type VPWR40F (Degussa Construction Co., Ltd., trade name). The blending amount is mixed at a ratio of 0.05 to 0.15 parts by weight with respect to 100 parts by weight of hydraulic cement, and if it is within this range, no sagging occurs when applying to a vertical surface and the coating workability is good. Become.

  The aggregate may be any material as long as it can be used in combination with a hydraulic material. However, in order to improve the cocoon handling, it is preferably JIS G5901 No. 48-150 silica sand, Since the blending component and blending amount are determined by the weight ratio of water and the resin solid content weight relative to the total solid weight, it is actually the remaining component. If the aggregate has the same particle size and the like, the same effect can be obtained, but silica sand is optimal from the viewpoint of cost and availability. If it is finer than JIS G5901, No. 150, the viscosity becomes high, and the workability of dredging is lowered. Commercially available products include Tohoku Silica Sand 6 and 7 (Kitanippon Sangyo Co., Ltd., trade name).

  As the mixing form of the compound, epoxy resin, water-based curing agent, water, hydraulic component, aggregate, water reducing agent, viscoelasticity adjusting agent are the main compounds. preferable. That is, it is preferable to use an aqueous curing agent and water, an epoxy resin, an aggregate, a water reducing agent, a viscoelasticity modifier, and a hydraulic component in order to prevent insufficient mixing / dispersion, property deactivation, measurement errors, and errors. However, you may mix | blend separately.

Coating material composition of the present invention can ² with coating 1.0~6.0kg / ^m concrete, about 2.0 kg / ^{m 2} is appropriate from the viewpoint of coating workability. If it is less than 1.0 kg / m ² , it is difficult to apply a uniform thickness on the substrate, and if it exceeds 6.0 kg / m ² , it is difficult to apply to a vertical surface. For concrete foundations of 10 days or more after the concrete is placed, the moisture on the concrete surface is volatilized and the pores on the concrete surface are in a hollow state, so only the moisture of the applied coating composition is There is a risk that the composition of the coating composition applied by reducing the water component by being sucked into the concrete surface will change before curing, resulting in poor curing, and as a primer to prevent this, the resin part ( Apply a mixture of epoxy resin, water-based curing agent and water (approx. 0.1 kg / m ² ), or mix 1: 1 with normal Portland cement in the resin part, and rub against the surface of the underlying concrete with a hammer. It is desirable to apply it so that

  The lining material that can be overlaid after applying the coating composition of the present invention is not limited to vinyl ester resin coating materials and epoxy resin coating materials. For example, a collision-mixing type polyurea resin coating material or a polyurea resin coating material that can be applied with a roller brush may be used. These polyurea resin coating materials are coated with an epoxy primer after the coating composition of the present invention is cured. Apply with spray or roller brush. Commercially available lining materials include Joliace JE-2503 (Aika Industry Co., Ltd., trade name) as a vinyl ester resin coating material, and Dynamic Resin C333 (Aika Industry Co., Ltd., trade name) as an epoxy resin coating material. .

Hereinafter, it demonstrates in detail in an Example and a comparative example.

Jolies JEX210A (epoxy resin manufactured by Aika Kogyo Co., Ltd., trade name, epoxy equivalent 180, solid content 100%, viscosity 0.7 Pa · s / 25 ° C.) and Jolias JEX210B (Aika Kogyo Co., Ltd.) Epoxy resin curing agent, trade name, active hydrogen equivalent 750, solid content 18% aqueous solution, viscosity 7 mPa · s / 25 ° C) 400 parts by weight, silica sand (JIS silica sand No. 100) 400 parts by weight, white cement ( Taiheiyo Cement Co., Ltd., White Portland Cement) 820 parts by weight, water reducing agent Melflux AP101F (Degussa Construction Co., Ltd., trade name, modified polycarboxylic acid water reducing agent) 5 parts by weight, VPWR40F (Co) Degussa construction, trade name) were blended 1 part by weight, the weight ratio of water to hydraulic cement .4: 1, the resin solids weight of 10 percent of the coating material composition was prepared based on the total solid content weight was as in Example 1.

  Example 2 was carried out in the same manner except that the white Portland cement of Example 1 was replaced with ordinary Portland cement (manufactured by Taiheiyo Cement Co., Ltd.).

Example 3 was carried out in the same manner except that the silica sand of Example 1 was changed to 830 parts by weight, the weight ratio of water to hydraulic cement was 0.4: 1 , and the resin solid content was 8%.

Example 4 was carried out in the same manner as in Example 3, except that 1090 parts by weight of white cement and 560 parts by weight of silica sand were used, and the weight ratio of water to hydraulic cement was 0.3: 1 and the resin solid content was 8%. .

The white cement of Example 3 was 1385 parts by weight, the silica sand was 825 parts by weight, 160 parts by weight of water was added, and the weight ratio of water to hydraulic cement was 0.35: 1 and the resin solid content was 6%. This was done in the same way as Example 5.

The white cement of Example 3 was 2120 parts by weight, the silica sand was 1265 parts by weight, 415 parts by weight of water was added, and the weight ratio of water to hydraulic cement was 0.35: 1 , and the resin solid content was 4% by weight. Example 6 was performed in the same manner.

Comparative Example 1
Comparative Example 1 was carried out in the same manner as in Example 3 except that the white cement was 1090 parts by weight, the silica sand was 1280 parts by weight, and the weight ratio of water to hydraulic cement was 0.3: 1 and the resin solid content was 6%. did.

Comparative Example 2
Comparative Example 2 was carried out in the same manner except that the silica sand of Example 3 was changed to 1550 parts by weight and the weight ratio of water to hydraulic cement was 0.4: 1 and the resin solid content was 6%.

Comparative Example 3
The white cement of Example 1 was 4330 parts by weight, the silica sand was 2580 parts by weight, 1190 parts by weight of water was added, and the weight ratio of water to hydraulic cement was 0.35: 1, and the resin solid content was 2% by weight. This was done in the same manner as Comparative Example 3 .

Comparative Example 4
Comparative Example 4 was carried out in the same manner as in Example 1 except that 660 parts by weight of white cement and 990 parts by weight of silica sand were used, and the weight ratio of water to hydraulic cement was 0.5: 1 and the resin solid content was 8%. did.

Comparative Example 5
Comparative Example 5 was designated as having no coating composition and no undercoating.

  Table 1 shows the results of Examples and Comparative Examples.

Evaluation method

  Total pore amount: The coating composition of the present invention is poured into a glass petri dish at a thickness of 3 mm, taken out from the petri dish after 24 hours, and then finely crushed with a hammer. Next, 2.5 to 5.0 mm fragments are removed by sieving, vacuum dehydration and trapping with dry ice (D-dry treatment) are performed, water in the coating composition is removed, and mercury intrusion is used. It was measured. For the measurement, an automatic porosimeter Autopore IV9500 manufactured by Shimadzu Corporation was used.

Swelling resistance: Concrete having a weight ratio of 0.8 and a hydraulic cement and water is made into a cylindrical shape of φ200 × 150 mm, and those having a material age of 1 day, 4 days, and 10 days are prepared. One day after the coating composition of the example was applied to the upper surface at a rate of 2.0 kg / m ² , the one-part moisture-curing urethane primer Jolieth JU-1270 (Aika Industry Co., Ltd., trade name) was set to 0. Apply 1 kg / m ² , dry to the touch, and then apply 0.4 kg / m ^{2 of} Jolieth JE2503 as a vinyl ester resin coating material and immediately apply JR-94KM (Glass Mat # 380, Aika Industry Co., Ltd., trade name) ) Was applied and impregnated, and further coated with a vinyl ester resin coating material by applying 0.6 kg / m ² of a vinyl ester resin coating material Joliase JE2503. It also Separately dynamic Resin C-333 0.7kg / ^{m 2} was applied in place of the vinyl ester resin coating material as epoxy resin coating material, further the same coating material 0.7 kg / ^{m 2} was applied after curing, Lined with epoxy resin coating. These were allowed to stand at 23 ° C. for 7 days, then used as test specimens, and immersed in 30 ° C. warm water for 28 days, leaving 10 mm from the top surface of the test specimens. 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%. The bulging area% of all ages is less than 1%, and the others are marked with x.

  鏝 Workability: An 8 mm thick flexible plate of 90 × 90 cm is placed horizontally, and a coating material composition is applied thereto for evaluation. All the blindfold samples were subjected to sensory evaluation, and those that were not heavy were marked with ◯, and those other than that were marked with ×. The fact that the hammer is not heavy means that the force applied to the hammer is about 1 N or less.

  Sagging property: The surface of a 300 × 300 × 60 mm concrete flat plate that complies with the provisions of JIS A5371 Annex 2 normal flat plate nominal 300 is washed with high-pressure water to remove weak portions on the surface. The coating material composition was applied with a hammer while keeping the surface of the flat plate vertical.

Water impermeability: A coating composition is applied at a rate of 2 kg / m ² (1 mm thickness) onto a 1 mm thick PVC plate, and the PVC plate is demolded after 48 hours. Thereafter, the coating material composition was cured for 7 days to obtain a test body, and the water permeability of the water permeability test B method of JISA 6909 was measured only with the coating material composition layer having no base. It was judged that it had waterproof performance at 0.2 ml or less, and this was set as (circle).

  Top coat adhesion 1: Use the test body lined with the vinyl ester resin coating material among the test bodies after completion of the blistering resistance test, and turn off the heater power and set the water temperature to 23 ° C. after the test. The sample is left in this state for 24 hours, and the specimen is taken out of the water, and its periphery is removed with a cutter knife so that the vinyl ester resin coating material remains 3 cm × 5 cm. The coating material (the coating material 10 in FIGS. 1 and 2) and the coating material composition layer (the objects to be coated in FIGS. 1 and 2) on the short side (3 cm) portion of the remaining vinyl ester resin coating material. 11) is inserted into the interface with the adhesive force measuring device shown in FIGS. 1 and 2, and the blade edge 1 is further applied to the interface between the vinyl ester resin coating material and the coating composition layer by loading the blade edge 1. Insertion progressed, the vinyl ester resin coating material was peeled from the coating composition surface layer, and the adhesiveness was evaluated using the load at the time of peeling as the adhesive force. A front view of the adhesion measuring device is shown in FIG. 1, and a plan view thereof is shown in FIG. The cutting edge angle is 11 °, and the measured value with this adhesive force measuring instrument is 10 N / cm or more as ◯, and the others are as x.

  Top coat adhesion 2: A test body lined with an epoxy resin coating material is used among the test bodies after completion of the above-mentioned blistering resistance test, and after the test is completed, the heater is turned off and the water temperature is set to 23 ° C. The sample is left in this state for 24 hours, and the specimen is taken out from the water, and the periphery thereof is removed with a cutter knife so that the epoxy resin coating material remains 3 cm × 5 cm. The coating material (the coating material 10 in FIGS. 1 and 2) and the coating material composition layer (the coating object 11 in FIGS. 1 and 2) on the short side (3 cm) portion of the epoxy resin coating material remaining thereon. 1 and FIG. 2 is inserted into the interface with the cutting edge 1 and the cutting edge 1 is further inserted into the interface between the epoxy resin coating material and the coating composition layer by loading the cutting edge 1. Then, the epoxy resin coating material was peeled from the surface layer of the coating material composition, and the adhesiveness was evaluated using the load at the time of peeling as the adhesive force. A front view of the adhesion measuring machine is shown in FIG. 1, and a plan view thereof is shown in FIG. The cutting edge angle is 11 °, and the measured value with this adhesive force measuring machine is 10 N / cm or more as ◯, and the others are as x.

Summary of evaluation results: In Examples 1 to 6, all the evaluation results were good. Accordingly, the total pore amount is 0.05 cc / g or more and 0.2 cc / g or less, the weight ratio of hydraulic cement to water is 0.3 or more and 0.4 or less, and the resin solid content weight is the total solid content weight. And a viscosity of 5 Pa · s to 40 Pa · s / 23 ° C. If the I value is 4.0 to 7.0 and the water permeability of the water permeability test B method of JISA 6909 is 0.2 ml or less, it can be suitably used as an anticorrosion lining material base, and even a high water content concrete base The coating composition and the concrete anticorrosion construction method are excellent in adhesion, tough, and prevent the permeation of moisture from the base concrete, and the concrete anticorrosion structure thereby.

  Hereinafter, the details of the concept of the adhesive force measuring device used in the above-mentioned top coat adhesion 1 will be described.

  1 and FIG. 2, the adhesive force measuring device includes a blade edge (blade) 1, a support wheel 2 that holds the blade edge 1 at an angle (11 ° in FIG. 1), and a blade edge. A handle 3 for pressing 1 to the coating material 10 side to be measured in the tip direction via a connecting rod 6 and a scale outer cylinder 8, and an instrument 4 for measuring the maximum pressing force (cylindrical spring balance) Consists of. The adhesive force measuring device applies the coating material 10 to the coating material 10 at the end of the coating material 10 which is the measurement object cut out to a predetermined width after the coating material 10 is applied to the coating material 11 and cured. The tip of the blade edge 1 is taken against the adhesion interface of the object 11 and pressed while grasping the hand 3 by hand, and the maximum stress when the coating material 10 is peeled off from the object 11 is measured by the instrument 4 that measures the maximum pressing force. To do.

  In the instrument 4 for measuring the maximum pressing force, a scale inner cylinder 9 is slidably inscribed on a scale outer cylinder 8, and connecting rods 6 are fixed substantially vertically on the lower and front sides of the scale inner cylinder 9. A kawaski integrated with the cutting edge 1 is fixed to the connecting rod 6. The inner cylinder 9 is attached to the end of the outer scale 8 inside the outer cylinder 8 by a coil spring (not shown). Accordingly, the rear end portion (right side in FIG. 1) of the inner cylinder 9 protrudes from the open right end (right side in FIG. 1) of the balance outer cylinder 8, and when the cutting edge 1 is pressed against the coating material 10, the pressing force increases. The rear end portion of the inner cylinder 9 slides gradually away from the open right end of the outer cylinder 8. That is, the force with which the blade edge 1 is pressed against the coating material 10 is increased by the extension of the coil spring (not shown). At the time of measurement, the point at which the inner cylinder 9 slides to the maximum is that the cutting edge 1 is pressed against the coating material 10 with the greatest force, and the coating material 10 is peeled off from the article 11 at that time. The maximum sliding position of the inner cylinder 9 is attached to a predetermined position of the outer cylinder 8 by the placing needle 5, the coating material 10 is peeled off from the object 11 to be coated, and the inner cylinder 9 is in the outer cylinder 8. Even after all the components are stored in the state shown in FIG. 1, the force with which the blade edge 1 is pressed against the coating material 10 can be read according to the position where the setting needle 5 is placed. Reference numeral 12 denotes a notch portion of the outer scale cylinder that is provided in a slender shape across the lower part of the outer scale cylinder 8. The notch 12 of the outer scale cylinder communicates with the connecting portion 6 to connect with the inner scale cylinder 9. It is fixed. Reference numeral 7 denotes a support wheel base for rotatably fixing the two support wheels 2 arranged on both sides, and is fixed to the lower side of the Kawasuki integrated with the blade edge 1. The angle of the blade edge 1 can be changed by moving the position of the support wheel 2 back and forth or changing the diameter of the support wheel 2. That is, the angle of the blade edge 1 can be reduced by moving the position of the support wheel 2 to the left in FIG. 1 or reducing the diameter of the support wheel 2.

  The instrument 4 for measuring the maximum pressing force uses a cylindrical spring balance in FIGS. 1 and 2, but may be a digital sensor type.

It is a front view of an adhesive force measuring device. It is a top view of an adhesive force measuring device.

Explanation of symbols

1 Cutting edge (blade)
2 Support wheel 3 Handle (fixed to the balance outer cylinder)
4 Instrument for measuring maximum pressing force 5 Placement needle (needle showing maximum value)
6 Connecting rod (fix the blade and inner cylinder)
7 Support wheel base (change the angle to move back and forth in the direction of the blade edge)
8 Weighing outer cylinder 9 Weighing inner cylinder 10 Coating material 11 Object to be coated 12 Notch of scale outer cylinder

Claims (9)

A water-based epoxy resin mortar composition comprising a hydraulic cement, an aggregate, a water-based epoxy resin, a water reducing agent, and a viscoelasticity modifier, wherein the weight ratio of water to the hydraulic cement is 0.3: 1 or more and 0.4: 1. The resin solid content weight is 4% or more and 10% or less with respect to the total solid content weight, and the water reducing agent is 0.1 to 1 part by weight with respect to 100 parts by weight of the hydraulic cement. Is 0.05 to 0.15 parts by weight with respect to 100 parts by weight of hydraulic cement , the total pore amount of the cured product is 0.05 cc / g or more and 0.2 cc / g or less, and the viscosity immediately after mixing is 5 Pa · s to 40 Pa · s / 23 ° C. An I value of 4.0 to 7.0, a water permeability of the water permeability test B method of JISA 6909 is 0.2 ml or less, and one powder composed of hydraulic cement, aggregate, water reducing agent, and viscoelasticity modifier; A coating composition comprising a liquid epoxy resin, and a liquid composed of an aqueous curing agent and water .   The coating composition 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 coating material composition according to claim 1, wherein the hydraulic cement is white cement.   Applying the coating composition according to any one of claims 1 to 3 to a concrete surface and curing it, applying a one-component moisture-curing urethane primer, and then lining the vinyl ester resin coating material. Concrete anticorrosion construction method.   A concrete anticorrosion construction method comprising applying a coating composition according to any one of claims 1 to 3 to a concrete surface and curing the composition, and lining an epoxy resin coating.   The concrete anticorrosion construction method according to claim 4 or 5, wherein the concrete is young age concrete of 1 day to 10 days after placement.   Applying the coating composition according to any one of claims 1 to 3 to a concrete surface and curing it, applying a one-component moisture-curing urethane primer, and then lining the vinyl ester resin coating material. Characteristic concrete anticorrosion structure.   A concrete anticorrosive structure, characterized in that the coating composition according to any one of claims 1 to 3 is applied to a concrete surface and cured, and an epoxy resin coating is lined. The concrete anticorrosive structure according to claim 7 or 8, wherein the concrete is young age concrete of 1 day to 10 days after placement.

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