JP3523933B2 - Construction method of rough concrete surface - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a rough concrete surface, which is capable of performing a construction on a rough concrete surface which has conventionally been performed in four steps in three steps.

[0002]

2. Description of the Related Art The exposed concrete surface of a building has a step or unevenness due to the accuracy of the form itself or the form installation (misalignment, distortion, step difference), and the concrete is sufficiently exposed. It is unavoidable that a relatively large defect such as a bean board-like unevenness is formed at a place that could not be poured. Also exposed concrete surface, AL
Many air bubble holes and pinholes are unavoidable on the C panel surface, concrete block surface, and precast concrete surface.

In such a state, even if a roughening concrete surface is directly coated with a building finish coating material for makeup,
You can't get an aesthetic one. Therefore, prior to finishing, it is necessary to partially repair conspicuous defects, then to flatten the rough concrete surface, and then to perform grading.

That is, first, for a relatively large defect such as a step or uneven portion or a plywood-like uneven portion, the cement is mixed with an aggregate such as sand, pearlite, leeche stone, and a polymer for admixing the cement. A mixture of a dispersion, a re-emulsifying powder resin, a thickener, and the like is mixed, and a mortar-like polymer cement mortar is used to perform partial repair so that the above-mentioned defects are flat.

Then, in order to flatten the target surface, including the meaning of closing many holes and pinholes generated on the rough concrete surface, a cement-based base conditioning coating material that passes each regulation of JIS A 6916. Or, apply a cement filler equivalent to it on the entire surface 1-2 times with a trowel or spatula to a thickness of 1 to 3 mm depending on the condition of the substrate, and then apply it for about a week in summer and 2 in winter. Let stand for more than a week to cure.

Next, in order to prevent efflorescence from the coated surface of the cement-based base conditioning coating material, or depending on the type of finish shape, a resin-based sealer or undercoat material is applied.

After adjusting the ground in this way,
On top of that, JIS A 6909, JIS A 691
No. 0, JIS A 6915, JIS A 6917, etc. are applied on the building finish coating material.

After all, conventionally, until the final finishing of the rough concrete surface such as the exposed concrete surface,
It was necessary to perform the next four steps in this order. (Step 1) A step of partially repairing defective portions such as steps and irregularities on the exposed concrete surface with polymer cement mortar. (Step 2) A step of applying the cement-based base conditioning coating material or a cement filler corresponding thereto after the step 1 evenly over the entire surface. (Step 3) A step of applying a resin-based sealer or an undercoat material so as to meet the purpose of the finished shape. (Step 4) A step of applying a finishing coating material for construction.

[0009]

As described above, conventionally, it was necessary to carry out the above-mentioned four steps 1 to 4 for the construction of a rough concrete surface such as a concrete exposed surface. In this industry, steps 1 and 2 for applying cement-based coating materials are classified as plastering industries, and steps 3 and 4 for applying resin-based coating materials are classified as coating industries.
Correspondingly, the plasterers will be in charge of the steps 1 and 2, and the painter will be in charge of the steps 3 to 4.

[0010] However, since the ratio of personnel expenses as a percentage of total construction cost by the sharp rise in labor costs in the current is very large, only the efficiency of raw material cost reduction and each step is just the reduction of the construction cost is almost impossible Or
It is difficult to prevent the cost increase.

In order to reduce the construction cost, it is necessary to drastically reduce the number of construction steps. Of the above steps 1 to 4, steps 1 and 4 are indispensable steps, but steps 2 and 3 are preparatory steps for step 4, so it is considered that those preparatory steps have the key to improvement. To be
However, since the method of providing steps 2 and 3 is a conventionally established construction method, no attempt has been made to reduce the number of construction steps by focusing on it, or even if there is an attempt, success will not be achieved. It is believed that they didn't.

Under the circumstances, the present invention can reduce the number of steps from the repair of a rough concrete surface such as a concrete exposed surface to the final finishing, and further, a curing period before starting the finishing step. Therefore, it is an object of the present invention to provide a method for constructing a rough concrete surface which can shorten the construction period and greatly reduce the construction cost.

[0013]

According to the method for constructing a rough concrete surface of the present invention, there is a problem that the construction of the next step B is disturbed among steps such as a step on the rough concrete surface as a base, unevenness, and pea board-like irregularities. Repair process A for partially repairing conspicuous defective parts with polymer cement mortar, flattening process B for flattening the entire concrete surface repaired in the previous process A with a trowel or spatula-like ironing or spatula coating, Carrying out a finishing step C of applying a finishing material to the entire surface flattened in the preceding step B in this order , and
The putty-like sealerless undercoat adjustment coating material in step B
Non-cement using synthetic resin emulsion as a mixture
System coating material, the total amount of the coating material is 100 parts by weight
3 to 25 parts by weight of synthetic resin emulsion (solid content
As), 20-70 by weight parts inorganic powder, 5 to 40-fold water
Parts, 5 to 60 parts by weight of aggregate with an average particle size of 0.01 to 3 mm , coloring
Composition consisting of proper amount of pigment and proper amount of other additives
A method for constructing a rough concrete surface, characterized by having .

The present invention will be described in detail below.

The construction method of the present invention comprises three steps, a repair step A, a flattening step B, and a finishing step C, as will be described in detail below. In contrast to the conventional processes 1 to 4 described above, the repair process A is the same as the conventional process 1, and the finishing process C is the same as the conventional process 4. And the flattening step B
Corresponds to the one in which the conventional process 2 and process 3 are integrated.

Examples of the target rough concrete surface include exposed concrete surface, ALC panel surface, concrete block surface, precast concrete surface and the like, and exposed concrete surface is particularly important.

The repairing step A is a step of partially repairing, with a polymer cement mortar, a conspicuous defect portion that hinders the construction of the next step B among steps, irregularities, beanboard-like irregularities of the rough concrete surface as a base. Is. The repair process A is not different from the conventional process 1 described above.

That is, on a rough concrete surface such as an exposed concrete surface, a step or unevenness may occur due to the form itself or the precision (misalignment, distortion, step difference) at the time of installing the form, or concrete may be removed. A plaque-like unevenness is formed at a place where it could not be poured sufficiently, but if such a defect is, for example, about 0.5 mm or more due to the difference in unevenness, it interferes with the construction of the next step B. Therefore, it is necessary to repair the defect with polymer cement mortar in advance.

The flattening step B is a step of flattening the entire concrete surface repaired in the previous step A with a trowel or spatula-like coating of a putty-like sealerless base adjusting coating material.

In the present invention, a non-cement-based coating material using a synthetic resin emulsion as a binder is used as the putty-like sealerless undercoating coating material . It
In addition, in the present invention, as such a sealerless undercoat adjusting coating material , when the total amount of the coating material is 100 parts by weight, 3 to 25 parts by weight (as a solid content) of the synthetic resin emulsion is an inorganic powder. Body 20-70 parts by weight, water 5-4
0 parts by weight, 5-60 parts by weight of aggregate having an average particle size of 0.01-3 mm,
Appropriate amount of color pigment (type and amount suitable for the color tone of finishing material), and other additives (thickener, dispersant, wetting agent, film-forming agent, film-forming auxiliary, antifoaming agent, preservative, etc.) A composition having an appropriate amount of is used.

Here, as the synthetic resin emulsion, acrylic resin emulsion, acrylic-styrene copolymer emulsion, acrylic-silicone resin emulsion, vinyl acetate resin emulsion, vinyl acetate-
Saturated branched fatty acid vinyl copolymer emulsion, ethylene-vinyl acetate copolymer emulsion, vinyl chloride resin emulsion, vinylidene chloride resin emulsion, epoxy resin emulsion, urethane resin emulsion, synthetic rubber latex, and mixed emulsions thereof. And various emulsions (including latex). The solid content of the synthetic resin emulsion is often about 30 to 60% by weight.

Examples of the inorganic powder include various kinds such as calcium carbonate, silica powder, talc, kaolin clay, mica powder and barium sulfate. Coloring pigments include titanium oxide, red iron oxide, zinc yellow, yellow iron oxide, black iron oxide, yellow lead, red lead, white lead, cadmium pigment, ultramarine blue,
There are various types such as dark blue, zinc green, chrome lead, chrome oxide, carbon black and various organic pigments. Examples of the aggregate include silica sand, crushed silica stone, cold water stone sand, pearlite, hil stone, obsidian, pine fatty rock, porous aggregate, river sand, and various other materials having a grain size of 0.01 to 3 mm.

The sealer-less primer adjusting coating material mixed in such a ratio can be applied with a trowel or spatula like the conventional cement-based primer adjusting coating material. The remaining unevenness and unevenness can be made flat.

The difference between this sealer-less base conditioning coating material and the cement-based base conditioning coating material used in the above-mentioned conventional process 2 is that since a synthetic resin emulsion is used as the binder, the efflorescence of cement is used. Is a point that does not occur. The one used in the conventional process 3 is called a resin-based sealer or a resin-based filler, both of which are liquid and are applied by a roller or spray, but the thickness of the coating film is thin. Therefore, when the conventional step 2 is omitted and the surface is directly applied to the concrete surface, it is not possible to flatten the base surface in which bubble holes or pinholes exist or in which unevenness or unevenness remains.

Further, the above-mentioned sealerless base adjustment coating material is
Since the color can be adjusted to the same color as that of the finishing material by using a pigment, the base can be concealed and it is effective as an undercoat material. In addition, since it is quick-drying and has a large adhesive force, various finishing materials using a synthetic resin as a binder can be easily applied in the next step.

The finishing step C is a step of applying a finishing material to the entire surface flattened in the previous step B. This finishing process C is not different from the conventional process 4.

[0027]

The sealerless undercoat adjusting coating material used in the flattening step B is capable of flattening the underlying air holes and pinholes and the underlying surface on which unevenness and unevenness remain, and does not use cement. Therefore, efflorescence does not occur, and since the same color as that of the finishing material can be adjusted, the base can be concealed and the adhesion is large. As described above, the sealer-less undercoat adjusting coating material used in the flattening step B has the performances of both the undercoating material and the resin-based sealer used in the conventional steps 2 and 3, so that the flattening step B It is possible to perform both the conventional process 2 and the conventional process 3 only.

In addition, in the conventional method, a curing period of about one week in summer and two weeks or more in winter is required after the construction of step 2 and before proceeding to step 3 (from step 3 to step In the flattening step B of the present invention, since it is quick-drying even though it has both steps 2 and 3, it takes 2 to 3 days for the next final step. It is possible to move to the finishing step C, and the construction period can be greatly shortened.

[0029]

EXAMPLES The present invention will be further described with reference to examples. Hereinafter, “parts” means parts by weight.

Example 1 (Repair Process A) Among defective parts such as steps on the exposed concrete surface and unevenness of beanboard, those parts having a difference of unevenness of about 0.5 mm or more conform to the quality standard of JIS A 6916. It was partially repaired with the polymer cement mortar.

(Planarizing Step B) A putty-like sealerless undercoat adjusting coating material having a thickness of about 1 mm was troweled or spatula-coated on the entire surface of the concrete surface repaired as described above to be planarized.

As the putty-like sealerless undercoat adjusting coating material, 23 parts of an acrylic emulsion having a solid content of 50% as a binder (11.5 parts as a solid content), 17.4 parts of calcium carbonate as an inorganic powder, 10 parts of clay, 2 parts of titanium oxide as a color pigment, 0.3 parts of methyl cellulose as a thickening agent, 0.4 parts of a dispersant, 0.5 parts of butyl cellosolve acetate as a film-forming aid, and 10.4 parts of water were added and kneaded into a paste. Average particle size of 0.5 as aggregate
16 parts of cold water stone sand having a diameter of 0.1 mm and 20 parts of cold water stone having a mean particle size of 0.1 mm were added and well kneaded.

(Finishing Step C) The sealerless base conditioning coating material is applied as described above,
After drying, JIS A 690 is applied to the entire flattened surface.
The architectural finishing material which passed each rule of 9 was spray-coated or roller-coated at a coating amount of about 2 kg / m ² .

(Finished state, construction period) By performing the above-mentioned three steps, the construction of the exposed concrete surface was completed. The finished state was extremely favorable. The construction period required for steps B and C was only a few days.

Example 2 (Repair Process A) Among defective parts such as steps on the exposed concrete surface and unevenness of bean board, those parts having a difference of unevenness of about 0.5 mm or more conform to the quality standard of JIS A 6916. It was partially repaired with the polymer cement mortar.

(Planarizing Step B) A putty-like sealerless undercoat adjusting coating material having a thickness of about 3 mm was troweled or spatula-coated on the entire surface of the concrete surface repaired above to be planarized.

As the putty-like sealerless undercoat adjusting coating material, 25 parts of an acrylic-styrene copolymer emulsion having a solid content of 50% as a binder (solid content of 11.5) was used.
20 parts of calcium carbonate as an inorganic powder, 2 parts of titanium oxide as a color pigment, 0.1 part of black iron oxide, 0.4 part of methyl cellulose as a thickener, 0.3 part of a dispersant, 0.7 part of a film-forming aid, And 11.5 parts of water are added and kneaded into a paste form, and as aggregate, cold water stone sand with a particle size of 0.5 to 3 mm 20
Parts and 20 parts of cold water stone sand having a grain size of 0.01 to 0.5 mm were added and well kneaded.

(Finishing Step C) The sealerless base conditioning coating material is applied as described above,
After drying, JIS A 691 is applied to the entire surface of the flattened surface.
The architectural finishing material which passed each rule of 0 was spray-coated or roller-coated at a coating amount of about 3 kg / m ² .

(Finishing State, Construction Period) The construction of the exposed concrete surface is completed by performing the above-mentioned three steps. The finished state was extremely favorable. The construction period required for steps B and C was only a few days.

[0040]

According to the construction method of the present invention, it suffices to provide only one flattening step B with the sealerless undercoat adjusting coating material between the repairing step A and the finishing step C (conventionally, After the flattening step B, no curing period is required. Therefore, according to the present invention, it is possible to shorten the construction period and significantly reduce the construction cost.

─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Akito Nakamura 2-5-1 Koyodai, Hannan City, Osaka Prefecture (72) Inventor Takashi Kageshima 4-42 Niwadaidai, Sakai City, Osaka Prefecture (72) Inventor Kamori Samori Osaka 1-6-5 Shiroyamadai, Sakai City (72) Inventor Koji Takebayashi 2-7-18 Yamate-cho, Suita City, Osaka Prefecture (72) Inventor Keiro Sakamoto 3-20-2 Matsugaoka, Akashi City, Hyogo Prefecture (72) Invention Fudo Kudo Fumio Kudo 2-10-15 Sawano, Akashi-shi, Hyogo (56) Reference JP-A-7-197670 (JP, A) JP-A-6-305856 (JP, A) JP-A-6-207469 (JP, A) (58) Fields surveyed (Int.Cl. ⁷ , DB name) E04G 23/02 E04F 13/02 E04F 13/08 101 E04F 15/12

Claims (2)

(57) [Claims] 1. A repairing step A for partially repairing, with a polymer cement mortar, a conspicuous defect portion which may hinder the construction of the next step B among steps, unevenness, beanboard-like irregularities of a rough concrete surface as a base, Flattening process B, in which a putty-like sealerless undercoat adjustment coating material is applied to the entire surface of the concrete surface repaired in the previous process A by ironing or spatula to flatten it, and a finishing material is applied to the entire surface of the flattened surface in the previous process B. The finishing step C to be performed in this order , and the putty-like sealerless undercoat adjusting coating material in the step B
However, it does not use a synthetic resin emulsion as a binder.
Ment type coating material, the total amount of the coating material is 100 weight
3 to 25 parts by weight of synthetic resin emulsion
(As solid content), inorganic powder 20-70 parts by weight, water 5
40 parts by weight, aggregate 5-60 weight average particle size of 0.01 to 3 mm
Parts, appropriate amount of color pigment, and appropriate amount of other additives
The method for constructing a rough concrete surface is characterized by having the following composition . 2. The method according to claim 1, wherein the rough concrete surface is an exposed concrete surface, an ALC panel surface, a concrete block surface or a precast concrete surface.