JPH0657930A - Method for treating concrete and / or mortar surface layer by selectively arranging highly air-permeable surface layer portion - Google Patents

Abstract

(57) [Summary] [Purpose] It is possible to perform the construction of a breathable underlayer, which is indispensable for the surface finishing of concrete and / or mortar structures, even when the concrete and / or mortar is young. A method of treating a concrete and / or mortar surface layer is disclosed. [Composition] A liquid composition having a high foaming performance is sprayed on the surface of the concrete and / or mortar after the pouring, and then the surface layer of the concrete and / or the mortar is agitated to form the liquid composition. After the material and the surface layer portion of the concrete pouring portion are kneaded and integrated, the upper surface of the kneading and integrated layer is smoothed again.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roof of a structure and / or
Or concrete and / or when forming the floor base
Alternatively, the present invention relates to a method for treating a mortar surface layer.

[0002]

2. Description of the Related Art Since water contained in concrete and / or mortar gradually diverges over a long period of time, a finishing material located on the surface of a concrete and / or mortar structure is breathable. However, most of the surface finishes of concrete and / or mortar structures that are being constructed nowadays are made of synthetic polymer materials, which are highly airtight. Yes, this allows the surface layer of these concrete and / or mortar structures to block the flow of water and air from the outside world, while, on the other hand, interfere with the breathing action of the underlying concrete and / or mortar. , Which blocks the water discharge path existing inside the concrete and / or mortar structure As a result, it is often reported that the moisture in the sealed state vaporizes during the warm season of the weather and partially pushes up the material finishing the surface of the structure, causing the blistering phenomenon and peeling phenomenon. It is being done.

In addition, in the work of applying a floor coating of a polymer material onto a concrete and / or mortar base forming the floor portion of the structure, the water content of the concrete and / or mortar base is finished. It is widely known that the performance of the coated floor layer is greatly influenced, and especially, the concrete and / or the base
In addition, when the water content of the mortar part is high, it is often reported that the adhesion strength of the finishing floor layer to the concrete and / or mortar part that is the base is lowered and that defective construction such as blistering phenomenon and peeling phenomenon occurs. ing.

Further, in the repair work of a structure whose construction period is restricted, or the work of a dirt floor or a basement where the moisture supply from the outside continues, the drying speed of the concrete and / or the mortar part is changed. The low level resulted in a hindrance to the progress of finishing work.

A method called aeration mortar method has been developed as one method for solving these various problems, in which ventilation is provided between the base concrete and / or mortar and the finishing floor layer. A layer of porous polymer cement mortar is provided, and by providing this layer, the pressure caused by the steam generated from the base concrete and / or mortar and the escape route of free water are created, and the layer is provided to the finish coating floor layer. It is intended to prevent blistering phenomenon and peeling phenomenon.

However, the aeration mortar construction method, which has achieved the purpose of imparting air permeability, also has a short elapsed time after placing the concrete and / or mortar is less than half a day, and the concrete and / or In the case of a young age group in which the work of the mortar is not possible for the worker, it is possible for the worker to place the ventilation mortar on the concrete and / or mortar base. Since it cannot be done, it is impossible to shorten the overall construction period, and the construction price is also high, so it was not a sufficient construction method.

In recent years, as a part of resource saving measures, one of the functions of a building is required to have high heat insulation efficiency, and it has become widely recognized that various heat insulation materials and heat insulation construction methods are available. However, since most of them are concentrated on the pursuit of heat insulation effect, and the lack of consideration for the breathing action of concrete and / or mortar that should be taken into consideration, The emergence of a drastic improvement measure was awaited.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and in addition to the construction of a concrete and / or mortar, the construction of a breathable underlayer, which is indispensable for the surface finish of concrete and / or mortar structures. It is an object of the present invention to disclose a method of treating concrete and / or mortar surface layer, which can be sufficiently implemented even when a young construction age is reached.

[0009]

Means for Solving the Problems The inventors of the present invention have conducted extensive studies to solve the above problems, and as a result, when forming a concrete and / or mortar structure,
After pouring concrete and / or mortar, spraying a foamable liquid composition on the surface of the concrete and / or mortar surface layer portion while still maintaining fluidity, It was found that this problem can be solved by adding a step of advancing the kneading work of the liquid composition rich in foaming property and the concrete and / or mortar surface layer part only to a shallow part, and has reached the present invention. The details will be described below.

That is, in the first claim according to the present invention, the liquid composition having a high foaming performance is sprayed on the surface of the concrete and / or mortar after the casting, and then the concrete and / or After stirring the surface layer portion of the mortar casting portion, the liquid composition rich in foaming performance and the concrete and / or the surface layer portion of the mortar casting portion are kneaded and integrated, and then the kneading and integrated layer are mixed again. The present invention relates to a method for treating concrete and / or mortar surface layer, which comprises selectively arranging a surface layer portion having high air permeability, which is characterized in that the upper surface is smoothed and cured as it is.

Further, the second aspect of the invention relates to a liquid composition substantially composed of a polymer dispersion containing no antifoaming agent, a surfactant for air entrainment and a bubble stabilizer. A liquid composition rich in foaming performance is sprayed onto the surface of concrete and / or mortar after completion of casting, and then the surface layer portion of the concrete and / or mortar casting portion is stirred. Then
The liquid composition rich in foaming performance and the concrete and / or the surface layer portion of the mortar casting portion are kneaded and integrated, and then the kneading is performed again, and the upper surface of the integrated layer is smoothed and cured as it is. The present invention relates to a method for treating a concrete and / or mortar surface layer in which a surface layer portion having high air permeability is selectively arranged.

Further, the third claim is a fluid comprising a polymer dispersion containing no antifoaming agent, a surfactant for air entrainment, and a bubble stabilizer.
A slurry obtained by kneading with a powder for accelerating the setting and hardening of cement is used as a liquid composition having a high foaming performance, and the liquid composition having a high foaming performance is used for concrete and / or
Alternatively, after spraying on the surface of the mortar, the concrete and / or the surface layer portion of the mortar casting portion is agitated, and the liquid composition rich in foaming performance and the concrete and / or
Alternatively, the surface layer portion of the mortar casting portion is kneaded and integrated, and then the kneading and smoothing of the upper surface of the integrated layer is performed again, and the surface layer portion having a high air permeability is selectively arranged. The present invention relates to a method for treating concrete and / or mortar surface layer.

The present invention has the contents as described above, but the polymer dispersion containing no antifoaming agent used in this case is JIS-based in view of its model.
It is intended for rubber latexes and resin emulsions defined in "Polymer dispersion for cement mixing" defined as A6203, and substantially any of the above two kinds of materials that does not contain an antifoaming agent. Used for.

Examples of the rubber latex include synthetic latex such as styrene butadiene rubber, chloroprene rubber, urethane rubber, acrylonitrile butadiene rubber and natural rubber latex, and resin emulsions include vinyl acetate resin and acrylic ester resin. , Vinylidene chloride resin, ethylene vinyl acetate resin, epoxy resin and the like.

On the other hand, examples of surfactants for air entrainment include rosin acid sodium salt, polyoxyethylene alkylphenol ether, sulfonic acid triethanolamine salt, sodium abietic acid, and higher alcohol sulfate ester salt.

Further, gelatin is used as a bubble stabilizer,
Examples thereof include protein derivatives such as casein, surfactants such as alkyl sulfonates, and water-soluble fibrin derivatives such as methyl cellulose and ethylhexyl cellulose.

As a powdery material for accelerating the setting and hardening of cement, bauxite, gypsum and limestone are used as raw materials.
The one composed of anhydrous calcium sulfaluminate obtained by firing this raw material at about 1200 ° C., gypsum, and quick lime, then the mixture of Portland cement with alumina cement and gypsum, and then , Which was obtained by mixing Portland cement clinker and alumina cement clinker and gypsum and then crushing it, and then, increasing the content of calcium aluminate in Portland cement and mixing a large amount of gypsum. And then crushed later, and finally, quick lime subjected to a special treatment.

[0018]

In the present invention, a liquid composition having a high foaming performance is sprayed on the surface of concrete and / or mortar after the completion of casting, and then the surface layer of the concrete and / or mortar is agitated. After kneading and integrating the liquid composition and the surface layer portion of the concrete and / or mortar-casting portion, it is the concrete and / or mortar to smooth the upper surface of the kneading / integrating layer again. In the surface layer of the concrete and / or mortar, the liquid composition having a high foaming performance and the concrete and / or mortar are kneaded in the surface layer of the cast portion,
By newly providing a hardened concrete and / or mortar part with high foaming ability integrated with the base, the finish material for covering the upper surface of the concrete and / or mortar base and the concrete and / or mortar base are highly While maintaining the adhesiveness, it secures a release path for moisture and steam escaping from the concrete and / or mortar base to prevent blistering phenomenon of the finishing material, and also uses a powdered material especially for accelerating the setting and hardening of cement. In such a case, the hardening time from the casting of concrete and / or mortar to the surface finishing is shortened, and the construction time is greatly shortened.

For this purpose, conventionally, after the concrete and / or mortar base is hardened and stabilized, the concrete and / or mortar base is provided with the above-mentioned water and steam discharge paths on the upper surface thereof. It is customary to separately provide a highly air-permeable region and apply a finish coating film that covers the upper surface of the concrete and / or mortar substrate by allowing it to dry and harden in this region. In comparison with that, a long construction period had to be passed as a curing period.

In the present invention, the special reason for using the polymer dispersion containing no defoaming agent is that the polymer dispersion itself containing no defoaming agent is originally
By kneading this anti-foaming agent-free polymer dispersion into highly fresh cement or concrete and / or mortar, it contributes to the formation of a cured product rich in porosity, that is, The purpose is to make the cured product porous by making the most of the air entrainment effect.

Further, in the present invention, the air entraining surfactant is used because the air is introduced into the concrete and / or the mortar separately from the introduction of air by the force of the polymer dispersion itself containing no defoaming agent. It is for the purpose of positively introducing fine air bubbles to secure a more air-permeable area, and the bubble stabilizer is used for concrete and / or mortar before hardening. And / or for controlling the release of bubbles introduced into the mortar from the concrete and / or the mortar, and keeping the bubbles stably dispersed in the concrete and / or the mortar. A raw material having a thickening effect on concrete and / or mortar is preferably used.

Finally, in the present invention, cement setting /
The combined use of the hardening acceleration powder enables the early hardening of concrete and / or mortar by using the cement setting / hardening acceleration powder in the slurry, which shortens the construction period of the structure. Is to enable.

[0023]

【Example】

[Example 1] The width is 350 mm and the depth is 250 m
m in a container having a depth of 50 mm, 438 kg of ordinary Portland cement, and 858 kg of fine aggregate,
After pouring a concrete obtained by kneading 700 kg of coarse aggregate and 254 kg of water with a mortar mixer to a thickness of 45 mm, styrene butadiene rubber latex as a polymer dispersion on the surface of the concrete (Chugai Shoko Co., Ltd. ), One coat mix, defoamer-free) is 100 g, and polyoxyethylene alkylphenol ether AE as a surfactant for air entrainment
Total of two types of agents ((Tupole C-3 manufactured by Takemoto Yushi Co., Ltd.
50g) and (Sanyoto LN manufactured by Sanyo Kasei Co., Ltd.)
M30g)) was 80 g, and a water-soluble fibrin derivative-based stabilizer (3% aqueous solution of Hydrocrete UWB manufactured by Mitsui Ishikasan Co., Ltd.) as a bubble stabilizer was added in such a proportion that it was 100 g. 100 g of the liquid composition was sprayed, and then, a depth of 20 mm from the surface layer was thoroughly stirred and kneaded with a rake, and the surface was smoothed with a metal trowel, and then 2
For the test sample obtained after a week curing period, the ventilation interval was set to 250 mm, the surface layer and the side surface of the sample were sealed with the epoxy resin sealing material, and the prepared 0.2 atm was used. The degree of ventilation was judged by measuring the amount of gas permeated into the sample during the test time of 10 minutes by the submersion method using nitrogen gas in two stages of 0.5 atm. However, the ventilation amount is 0.
It was confirmed that 25 ml was shown at 2 atm, and 75 ml was shown at 0.5 atm, which means that when the above liquid composition is not used, there is no air flow. It shows a marked improvement compared to what was not admitted.

Example 2 When the same treatment as in Example 1 was carried out except that 200 g of the liquid composition was sprayed, the air flow rate was 35 ml at 0.2 atm.
It was confirmed that 90 ml was shown in the case of 0.5 atm, which is remarkably large compared to the fact that no aeration was observed when the above liquid composition was not used. Shows progress.

Example 3 A container having a width of 350 mm, a depth of 250 mm and a depth of 50 mm,
438 kg of normal Portland cement and 858 kg
The concrete obtained by kneading the fine aggregate of No. 1, 700 Kg of coarse aggregate, and 254 Kg of water with a mortar mixer was used.
After being poured to a thickness of mm, styrene butadiene rubber latex as a polymer dispersion (made by Chugai Shoko Co., Ltd., one coat mix,
The total amount of two types of polyoxyethylene alkylphenol ether-based AE agents as surfactants for air entrainment (excluding defoaming agent) is 100 g (Tupole C-3 50 g manufactured by Takemoto Yushi Co., Ltd.), and (SANYO KASEI). (Industrial Co., Ltd. Sandet LNM 30 g)) is 80 g, and the water-soluble fibrin derivative-based stabilizer (3% aqueous solution of Hydrocleat UWB manufactured by Mitsui Ishikasan Co., Ltd.) as a bubble stabilizer is 1
10 g of a liquid composition blended in such a proportion that the amount is 00 g.
0 g was sprayed, and after that, when the depth from the surface layer was 20 mm, the mixture was sufficiently stirred and kneaded using a rake, and then the surface of the concrete was smoothed with a metal trowel to obtain a curing period of 3 days. When the water content of the test sample was measured,
The value was 8.3%, which was significantly lower than 16.8% when the liquid composition was not used.

[Example 4] The water content of the sample obtained in the same manner as in Example 3 was measured except that 200 g of the liquid composition was sprayed, and the value was 7.0%. The value was significantly lower than the value of 16.8% in the case where the above composition was not used.

[Embodiment 5] The concrete prepared by using the liquid composition of the present invention prepared in Embodiment 1 was molded in a container, and the surface treated with porosity was treated 2 days later. Apply epoxy resin-based flooring material as a finishing material to
After 14 days, a notch having a depth of about 25 mm was made around a region having a width of 40 mm and a length of 40 mm on the surface coated with the epoxy resin-based flooring material. After that, an epoxy adhesive is applied to the above area, an iron jig finished to the same dimensions is placed on the top surface and left for 3 hours, then the adhesive strength is measured using a Kenken-type adhesion tester. When done, 12.5Kgf / c
A value of m ² was obtained, and after 14 days had passed without pouring the liquid composition after pouring the concrete into the container, the surface of the concrete was coated with the epoxy resin-based flooring material, and then 14 Got after the day passed,
It was clarified that it was the same as the value when the adhesive strength on the surface coated with the epoxy resin-based flooring material was measured.

In the coating treatment of the above epoxy resin-based flooring material, an epoxy resin-based primer is applied in advance, and after confirming that the epoxy resin-based primer is completely cured, An epoxy resin-based floor material was applied by a brush application method.

[Embodiment 6] The width is 300 mm and the depth is 2
Styrene butadiene rubber latex (manufactured by Chugai Shoko Co., Ltd., one coat mix, does not contain defoaming agent) on the surface of concrete that is 50 mm thick in a 50 mm container.
Is 100 g, and a polyoxyethylene alkylphenol ether-based AE agent 2 as a surfactant for air entrainment 2
Total of kinds ((Tupole C-35 manufactured by Takemoto Yushi Co., Ltd.
0g) and (Sanyoto LNM3 manufactured by Sanyo Kasei Co., Ltd.)
0 g)) is 80 g, and a water-soluble fibrin derivative-based stabilizer (3% aqueous solution of Hydrocrete UWB manufactured by Mitsui Ishikasan Co., Ltd.) as a bubble stabilizer is 100 g, for cement setting and hardening promotion. 100 g of a composition in which 280 g of powdered admixture (Dencaplacto-1 manufactured by Denki Kagaku Kogyo Co., Ltd.) was blended, and 15 m from the surface layer part
After thoroughly kneading the space between m with a rake, the surface of the concrete was smoothed with a metal trowel, and the density was measured for a sample aged for 30 days. The value was 2.23 g / c.
The value of m ³ was almost the same as the value of 2.25 g / cm ³ obtained in the sample in which the liquid composition was not injected.

[Embodiment 7] The width is 300 mm and the depth is 2.
A composition 200 similar to that described in Example 6 on the surface of a concrete constructed to a thickness of 50 mm in a 50 mm container.
When the surface of the concrete is smoothed with a metal trowel after spraying g and thoroughly kneading with a rake for a distance of 15 mm from the surface layer, the hardening time of the concrete surface layer is only over 2 hours, The performance was significantly improved compared to 10 hours when the slurry composition was not sprayed, and the process could be significantly shortened.

[Comparative Example 1] The time-dependent change in the water content of a concrete sample in which the liquid composition was not used was measured until the water content of 7.1% was reached. The samples, which were 21 days extra compared to the treated concrete of the invention, finally gave similar results to the concrete of the invention.

As shown above, the present invention makes a great contribution to persons involved in building construction.

[0033]

According to the present invention, although the compressive strength is slightly inferior to the conventional construction method, there is no problem in practical use and the construction period of concrete and / or mortar is greatly reduced. Succeeding in doing so makes a great contribution to the contractor in charge of construction, and there is a great contribution to the industry that uses such a construction method.

Claims (3)

[Claims] 1. A liquid composition having a high foaming performance is sprayed onto the surface of concrete and / or mortar after casting, and the surface layer of the concrete and / or mortar is then stirred to form the liquid. The composition and the concrete and / or the surface layer portion of the mortar casting portion are kneaded and integrated, and then again, the kneading and the upper surface of the integrated layer is smoothed and cured as it is. A method for treating a concrete and / or mortar surface layer in which a rich surface layer portion is selectively arranged. 2. The liquid composition according to claim 1, wherein the liquid composition is substantially composed of a polymer dispersion containing no antifoaming agent, a surfactant for air entrainment, and a bubble stabilizer. A method for treating a concrete and / or mortar surface layer in which a surface layer portion having high air permeability is selectively arranged. 3. A fluid composition comprising a polymer dispersion containing no antifoaming agent, a surfactant for air entrainment, and a bubble stabilizer, and a powdery material for accelerating cement setting and hardening. The method for treating a concrete and / or mortar surface layer according to claim 1, which is a slurry obtained by kneading and.