JP3098626B2 - Method for treating concrete and / or mortar surface layer in which surface layer with high air permeability is selectively disposed - Google Patents

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
Or, it relates to a method for treating a mortar surface layer.

[0002]

2. Description of the Related Art Since the moisture contained in concrete and / or mortar is gradually released over a long period of time, the finishing material located on the surface of the concrete and / or mortar structure has air permeability. However, most of the surface finishes of concrete and / or mortar structures currently being constructed are made of air-tight materials mainly composed of synthetic polymer materials. Yes, this causes the surface layer of these concrete and / or mortar structures to block the flow of water and air from the outside world, but on the other hand, impedes the respiration of the underlying concrete and / or mortar. , Which blocks the path of water release present inside the concrete and / or mortar structure In many cases, water in a sealed state evaporates during the warm season of the weather and partially pushes up the material finishing the surface of the structure, causing blistering and peeling phenomena. Is being done.

[0003] In addition, in the operation of applying a coated floor with a polymer material on a concrete and / or mortar foundation forming a floor portion of a structure, the moisture of the concrete and / or mortar portion as the foundation is subjected to the finishing. It is widely known that the performance of a coated floor layer is greatly affected, and in particular, concrete and / or
Or, when the moisture content of the mortar part is high, the adhesion strength of the finish-coated floor layer to the underlying concrete and / or the mortar part is lowered, and there are many reports of poor construction such as blistering and peeling. ing.

[0004] Further, in the renovation work of a structure whose construction period is restricted, or in the construction of a slab or a basement where water supply from the outside is continued, the drying speed of the concrete and / or mortar part constructed is reduced. The low cost has hindered the progress of finishing work.

[0005] A method called a ventilation mortar method has been developed as one method for solving these problems, in which air permeability is provided between the foundation concrete and / or mortar and the finish-coated floor layer. One layer of porous polymer cement mortar is provided, and by providing this layer, an escape route is created for the pressure and free water brought by the water vapor generated from the underlying concrete and / or mortar, and the escape is provided to the finish-coated floor layer. It is intended to prevent blistering and peeling.

[0006] However, the ventilation mortar method which achieves the purpose of imparting air permeability also requires a short time, such as less than half a day, after the casting of the foundation concrete and / or mortar. In the case of young materials that are hardened only to the extent that workers cannot work on the mortar construction surface, workers may proceed with the construction of ventilation mortar on concrete and / or mortar foundation. Since it was not possible, it was impossible to shorten the entire construction period, and the construction cost was expensive, so it was not possible to say that the construction method was sufficient.

In recent years, as part of resource saving measures, one of the functions of a building is required to have high heat insulation efficiency, and it has been recognized by the general public. However, most of them are only focused on the pursuit of heat insulation and there is not enough consideration for the respiration of concrete and / or mortar, which should be considered. The emergence of drastic improvements was awaited.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and is intended to provide a concrete and / or mortar construction with a breathable underlayer which is indispensable for surface finishing of concrete and / or mortar construction. It is an object of the present invention to disclose a method of treating concrete and / or mortar surface layer that can be sufficiently implemented even at the time of young construction work.

[0009]

Means for Solving the Problems The present inventors have conducted intensive studies and researches to solve the above-mentioned problems, and as a result, when forming concrete and / or mortar structures,
After the concrete and / or mortar has been poured and the liquid composition having a high foaming property is sprayed on the surface thereof while the fluid and the mortar still maintain the fluidity, the concrete and / or the mortar surface layer It has been found that this problem can be solved by adding a step of advancing the kneading operation of the liquid composition having a high foaming property and the concrete and / or mortar surface layer only in the shallow portion, and the present invention has been achieved. The details will be described below.

[0010] That is, the first aspect of the present invention relates to a method for spraying a liquid composition having a high foaming performance on the surface of concrete and / or mortar after completion of casting, and thereafter, After stirring the surface layer portion of the mortar casting portion and kneading and integrating the liquid composition rich in foaming performance and the surface layer portion of the concrete and / or the mortar casting portion, the kneading and integration of the integrated layer are performed again. The present invention relates to a method for treating a surface layer of concrete and / or mortar, in which a surface layer portion having high air permeability is selectively disposed, wherein the upper surface is smoothed and cured as it is.

The second aspect of the present invention relates to a liquid composition comprising a polymer dispersion substantially free of an antifoaming agent, a surfactant for entraining air, and a foam stabilizer. A liquid composition having a high foaming performance is formed, and the liquid composition having a high foaming performance is sprayed on the concrete and / or mortar surface after the completion of the casting, and then the surface layer of the concrete and / or mortar casting portion is stirred. And
After kneading and integrating the liquid composition rich in foaming performance and the surface layer portion of the concrete and / or mortar casting portion, the upper surface of the kneading and integrated layer is smoothed again and cured as it is. The present invention relates to a method for treating a concrete and / or mortar surface layer in which a highly air-permeable surface layer portion is selectively disposed.

Further, a third aspect of the present invention relates to a fluid comprising an antifoaming agent-free polymer dispersion, an air entraining surfactant and a foam stabilizer.
A slurry obtained by kneading a powdery substance for promoting cement setting and hardening is used as a liquid composition having a high foaming performance, and the liquid composition having a high foaming performance is subjected to concrete and / or
Or after spraying on the mortar surface, the concrete and / or the surface layer portion of the mortar casting part is stirred, and the liquid composition rich in foaming performance and the concrete and / or
Alternatively, after kneading and integrating with the surface layer portion of the mortar casting portion, the upper surface of the kneading and integrated layer is smoothed again, and the surface layer portion having high air permeability characterized by being cured as it is is selectively disposed. The present invention relates to a method for treating a concrete and / or mortar surface layer.

The present invention has the above-mentioned contents, but the polymer dispersion containing no antifoaming agent used in this case is JIS based on its model.
Rubber latexes and resin emulsions specified in "Polymer dispersion for cement admixture" specified as A6203 are targeted, and among those two types, those containing no defoaming agent are substantially used. Used for

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

On the other hand, examples of surfactants for air entrainment include sodium rosinate, polyoxyethylene alkylphenol ether, triethanolamine sulfonate, sodium abietate, and higher alcohol sulfate.

Further, gelatin is used as a foam stabilizer,
Examples thereof include protein derivatives such as casein, surfactants such as alkyl sulfonates, and water-soluble cellulose derivatives such as methylcellulose and ethylhexylcellulose.

As a powdery substance for promoting cement setting and hardening, bauxite, gypsum and limestone are used as raw materials.
The one composed of anhydrous calcium sulfoaluminate obtained by calcining this raw material at about 1200 ° C., gypsum, and quicklime, and then the mixture of Portland cement with alumina cement and gypsum, A mixture obtained by mixing Portland cement clinker, alumina cement clinker and gypsum and then pulverizing, and then increasing the content of calcium aluminate in Portland cement and mixing a large amount of gypsum Examples of the crushed lime include those obtained by subjecting quicklime to a special treatment.

[0018]

According to the present invention, a liquid composition having a high foaming performance is sprayed on the concrete and / or mortar surface after the casting, and the surface layer of the concrete and / or mortar casting portion is stirred. After kneading and integrating the liquid composition and the surface layer portion of the concrete and / or mortar casting portion, and smoothing the upper surface of the kneading and integrated layer again, the concrete and / or mortar In the surface portion of the casting portion, the liquid composition rich in foaming performance and the concrete and / or mortar are kneaded, and the concrete and / or mortar
By newly providing a hardened concrete and / or mortar portion having a high foaming performance integrated with the foundation, the finish material for covering the upper surface of the concrete and / or mortar substrate and the concrete and / or mortar foundation can be improved. While maintaining the adhesiveness, it secures a path for releasing moisture and steam escaping from the concrete and / or mortar substrate to prevent blistering of the finishing material, and also uses a powdery substance especially for cement setting and hardening. In this case, the hardening time from the placement of concrete and / or mortar to the surface finishing is shortened, and the construction time is greatly reduced.

Conventionally, for this purpose, after the concrete and / or mortar base is hardened and stabilized, the concrete and / or mortar base is provided with the above-mentioned water or vapor discharge path on the upper surface thereof. When a region having high air permeability is separately provided, and it is customary to apply a finish coating film covering the upper surface of the concrete and / or mortar substrate after drying and hardening in this region, As a result, a longer construction period had to be passed as a curing period.

In the present invention, a special reason for using a polymer dispersion containing no defoaming agent is that the polymer dispersion itself containing no defoaming agent originally has
By kneading the polymer dispersion having foaming properties and containing no antifoaming agent into cement or concrete and / or mortar having high freshness, it contributes to the production of a hardened material having high porosity. It is intended to make the cured product porous by making use of a more pronounced air entraining action.

Further, in the present invention, the use of the air entraining surfactant is different from the introduction of air by the force of the polymer dispersion itself containing no antifoaming agent, in addition to the introduction of air into concrete and / or mortar. The purpose is to actively introduce fine air bubbles and to secure a more air-permeable area. The use of the bubble stabilizer is performed before the concrete and / or mortar hardens. And / or to control the release of the air bubbles introduced into the mortar from the concrete and / or the mortar and to stably disperse and maintain the air bubbles in the concrete and / or the mortar. Preferably, a raw material having a thickening effect on concrete and / or mortar is used.

Finally, in the present invention, cement setting
The use of the powder for hardening acceleration combined with the use of the powder for cement setting and hardening in the slurry enables early hardening of concrete and / or mortar and shortens the construction period of the structure. It is for making it possible.

[0023]

【Example】

[Example 1] The width is 350 mm and the depth is 250 m
m, 50 mm deep in a container, 438 Kg of ordinary Portland cement, 858 Kg of fine aggregate,
After a concrete obtained by kneading 700 kg of coarse aggregate and 254 kg of water with a mortar mixer is poured to a thickness of 45 mm, a styrene-butadiene rubber latex (Chugai Shoko Co., Ltd.) as a polymer dispersion is poured on the concrete surface. ), One-coat mix, without defoamer) is 100 g, and polyoxyethylene alkylphenol ether AE as a surfactant for air entrainment
Of the two types of agents ((Chupol C-3 manufactured by Takemoto Yushi Co., Ltd.)
50g) and (Sandet LN manufactured by Sanyo Chemical Industry Co., Ltd.)
M30 g)) was 80 g, and a water-soluble cellulose derivative-based stabilizer (3% aqueous solution of Hydrocrete UWB manufactured by Mitsui Petrochemicals Co., Ltd.) as a foam stabilizer was mixed in such a ratio as to be 100 g. After spraying 100 g of the liquid composition, the mixture was thoroughly stirred and kneaded with a rake using a rake for a depth of 20 mm from the surface layer, and the surface was smoothed with a gold iron.
For the test sample obtained after a curing period of one week, the ventilation interval was set to 250 mm, and the surface and side surfaces of the sample were sealed with a sealing material of epoxy resin. Using a two-stage nitrogen gas at 0.5 atm, the amount of gas permeated into the sample during the test time of 10 minutes was measured by an underwater replacement method to determine the degree of gas permeation. However, as the ventilation amount, 0.1.
It was confirmed that 25 ml was shown at 2 atm, and 75 ml at 0.5 atm. However, when the above-mentioned liquid composition was not used, the amount of ventilation was quite low. Significant progress compared to what was not recognized.

[Example 2] When treated in the same manner as in Example 1 except that 200 g of the liquid composition was sprayed, aeration rate was 35 ml at 0.2 atm.
In the case of 0.5 atm, it was confirmed that 90 ml was shown, but this was markedly lower than that in the case where the above-mentioned liquid composition was not used, no ventilation was observed at all. Showing progress.

Example 3 In a container having a width of 350 mm, a depth of 250 mm and a depth of 50 mm,
438Kg of ordinary Portland cement and 858Kg
Of concrete obtained by kneading fine aggregate of 700 kg of coarse aggregate and 254 kg of water with a mortar mixer.
mm, and then styrene-butadiene rubber latex (manufactured by Chugai Shoko Co., Ltd., one coat mix,
(Excluding the defoaming agent) is 100 g, and a total of two types of polyoxyethylene alkylphenol ether-based AE agents as air-entraining surfactants (50 g of Chupol C-3 manufactured by Takemoto Yushi Co., Ltd.) and (Sanyo Chemical Co., Ltd.) 80 g of Sandet LNM (manufactured by Kogyo Co., Ltd.), and 1 g of a water-soluble cellulose derivative-based stabilizer (3% aqueous solution of Hydrocrete UWB manufactured by Mitsui Chemicals, Inc.) as a foam stabilizer.
100 g of the liquid composition mixed at a ratio of
After spraying 0 g, the mixture was thoroughly stirred and kneaded with a rake between the depths of 20 mm from the surface layer using a rake, and the surface of the concrete was smoothed with a gold trowel to obtain a curing period of 3 days. When the moisture 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 a sample obtained in the same manner as in Example 3 except that 200 g of the liquid composition was sprayed was 7.0%. Was significantly lower than 16.8% in the case where the composition was not used.

[Example 5] On the second day after the concrete using the liquid composition according to the present invention produced in Example 1 was molded in a container, the surface subjected to a porous treatment was treated 2 days later. Apply an epoxy resin-based flooring material as a finishing material to
After 14 days had elapsed, a cut 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 coated floor material. Then, an epoxy-based adhesive was applied to the above area, and an iron jig finished to the same dimensions was placed on the upper surface and left for 3 hours. Then, the adhesive strength was measured using a Kenken-type adhesion tester. 12.5Kgf / c
m ² value is obtained that, starting at the time the leave 14 days without use of the liquid composition after by injecting concrete into the container has passed the coating flooring epoxy resin is applied to the surface of the concrete, then 14 Gained after the passage of days,
It was clarified that the value was the same as the value obtained when the adhesive strength was measured on the surface coated with the epoxy resin-based floor material.

At the time of applying the epoxy resin-based coated floor 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 coating was applied by a brush coating 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, excluding defoamer) is applied to the surface of concrete that has been constructed to a thickness of 50 mm in a 50 mm container.
Is 100 g, and a polyoxyethylene alkylphenol ether AE agent 2 is used as a surfactant for entraining air.
Total ((Chuopu C-35 manufactured by Takemoto Yushi Co., Ltd.)
0g) and (Sandet LNM3 manufactured by Sanyo Chemical Industry Co., Ltd.)
0 g)) is 80 g, and 100 g of a water-soluble cellulose derivative-based stabilizer (3% aqueous solution of Hydrocrete UWB manufactured by Mitsui Chemicals Co., Ltd.) as a foam stabilizer is used for promoting cement setting and hardening. 100 g of a composition containing 280 g of a powdery admixture (Dencapact-1 manufactured by Denki Kagaku Kogyo Co., Ltd.) and spraying 15 m from the surface layer
m, the surface of the concrete was smoothed with a trowel, and the density of the cured sample was measured over 30 days. The value was 2.23 g / c.
A m ^3, almost the same value as 2.25 g / cm ³ of the values obtained in the samples without injecting a liquid composition was obtained.

[Embodiment 7] The width is 300 mm and the depth is 2
A composition 200 similar to that described in Example 6 was applied to the surface of concrete applied to a 50 mm container to a thickness of 50 mm.
g, and the surface of the concrete was smoothed with a gold trowel after the mixture was thoroughly kneaded with a rake for 15 mm from the surface layer, and the hardening time of the concrete surface layer was slightly more than 2 hours, The performance was much higher than 10 hours when the slurry composition was not sprayed, and the process could be significantly shortened.

[Comparative Example 1] When the change of the water content with time was measured for a concrete sample in which the liquid composition was not used, the water content of the concrete sample was 7.1% until it showed a value of 7.1%. Samples that were 21 days longer than the treated concrete of the present invention gave similar results to the concrete of the present invention.

As described 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 method, there is no problem in practical use, and the construction period of concrete and / or mortar is greatly reduced. Success in doing so makes a great contribution to the contractor in charge, and in many ways contributes to the industry using such construction methods.

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Claims (3)

(57) [Claims] After spraying a liquid composition having a high foaming performance onto the concrete and / or mortar surface after the casting, the surface layer of the concrete and / or mortar casting portion is stirred and the liquid After kneading and integrating the above composition with the surface layer of the concrete and / or mortar casting portion, the upper surface of the kneading and integrated layer is smoothed again 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 disposed. 2. The liquid composition according to claim 1, wherein the liquid composition is substantially composed of a polymer dispersion containing no defoamer, a surfactant for entraining air, and a foam stabilizer. A method for treating a concrete and / or mortar surface layer in which a highly air-permeable surface layer portion is selectively disposed. 3. A fluid comprising a polymer dispersion containing no defoamer, a surfactant for air entrainment, and a foam stabilizer, and a powdery substance for promoting cement setting and hardening. 2. The method for treating a concrete and / or mortar surface layer according to claim 1, wherein the slurry is a slurry obtained by kneading the surface layer with high air permeability.