JPH0466837B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to a method for constructing mortar material used for flooring, walling, etc. (Prior Art and its Problems) Traditionally, for floor finishing, synthetic resin mortar coating on the surface of poured concrete has often been used. The ingredients of these floor coverings are epoxy,
It is polyester-based, etc., and is a solvent type. None of these resin mortars completely satisfies the various conditions required for floor coverings; for example, epoxy resins have poor workability and are uneconomical;
Polyester has excellent acid resistance, but is weak against alkalinity and shrinks significantly when cured. Therefore, in places where water resistance, chemical resistance, and abrasion resistance are required, such as food factory floors and hotel, school, and hospital kitchens, the floor surfaces cannot be fully adapted to the usage conditions, causing deterioration and peeling of the floor surface. Many such things were happening. Therefore, the floor has to be repainted, but when repainting these floors, the floor must be completely smoothed, any unevenness removed, and completely dried, as conventional flooring materials are made of organic materials. After that, the flooring material must be applied, which takes time and labor, and thinner must be used during construction, which has the disadvantage of being smelly and dangerous. In the construction of these conventional plastered flooring materials, the surface of the concrete to be constructed is first thoroughly cleaned (cleaned), then an adhesion-enhancing sealer is applied, and unevenness is adjusted with a thick coating resin mortar. The process up to this point takes one day. Next, the surface is partially sanded, a sealer is applied partially, and then the entire surface is coated with a thin coat of resin mortar. The process up to this point takes one day. Especially in this process, the surface must be pressed down with a trowel to make it smooth.
Colorization becomes difficult. On the third day of construction, the areas with thin skin are painted and treated with paper. As described above, the conventional construction method requires a large number of steps and takes three days because the next work cannot be started until the surface is completely dry. (Means for Solving the Problems) The present invention has been made to solve the above problems, and the first invention is to completely clean the concrete surface and then apply a sealer to the concrete surface to enhance adhesion. Then, a mortar material made by homogeneously mixing hard sand with a diameter of 1 mm or less at a ratio of 0.8 to 1.5 times the weight to a mixture of 60 to 70% by weight of cement and 30 to 40% by weight of mineral furnace slag is applied to a predetermined thickness. The second invention is characterized in that after completely cleaning the concrete surface, a sealer is applied to the concrete surface to enhance adhesion, and then 60 to 70% by weight of cement and 30 to 40% by weight of mineral furnace slag are applied. It is characterized in that a resin liquid is mixed into a mortar material made by homogeneously mixing hard sand with a diameter of 1 mm or less in a ratio of 0.8 to 1.5 times the weight of the mixture, and the mixture is applied to a predetermined thickness. (Effects of the invention) According to the mortar material construction method of the present invention, there are fewer steps during construction, so the construction period is shortened, and
Construction is easy. Furthermore, after construction, the mortar material has a strong surface strength and is excellent in water resistance, chemical resistance, durability, and weather resistance. It also has strong adhesion and does not peel off easily. (Structure) First, to explain the mortar material used in the present invention, the cement used in the mortar material of the present invention is blast furnace B type cement, and 50 to 60% by weight of this cement and 50 to 40% by weight of mineral furnace slag. Mix % by weight. Mineral furnace slag is a by-product during the production of drilled iron, and generally contains 28-38% SiO ₂ , 8-18% Al ₂ O ₃ , 30-45% CaO, and 16% MgO by weight. It contains S, Mn, and O in the following proportions, and also contains small amounts of S, Mn, and O. This furnace slag is used to improve the fineness of the product, and is made into a fine powder of about 5 microns. This cement and furnace slag may be mixed and used as the main material, but a mortar material marketed by Nippon Steel Cement Co., Ltd. under the trade name NEM-B may also be used as the main material. This mixture is mixed with silica sand having a hardness of 0.8 to 1.5 times by weight. This hardness silica sand is sandbreasted sand,
Due to its extremely high hardness, the hardness of the product increases after installation.
mm or less), for example, 40 kg. As this hard silica sand, for example, Olivine Sand (trade name, manufactured by Toho Olivine Co., Ltd.) may be used. The above-mentioned adhesive additive has the effect of suppressing surface variations during mortar application, improving the tip of the trowel, and making mortar easier to apply. In other words, it is an inorganic flooring material that smooths the rough surface of cement. As this adhesive additive, Metrose, which is a commercially available product of Shin-Etsu Chemical Co., Ltd., may be used. Furthermore, the tailings mentioned above are powder on the rock surface, which improves the slippage of the trowel. If the mortar material is to be colored, it is sufficient to mix 4% of the pigment made by Scottsfield, Inc., based on the total weight of the cement and furnace slag. During construction, the concrete surface to be constructed is first thoroughly cleaned, and an adhesion-enhancing sealer is applied to this surface to a thickness of approximately 10 microns. Next, the mortar material of the present invention is applied to a thickness of about 5 mm on the concrete and hardened. As the sealer, a known water-soluble resin wax sealer (for example, Clear Sealer, a trade name manufactured by Shikoku Kaken Co., Ltd.) may be used. When constructing this mortar material, use the mortar material mentioned above.
Add 5 parts of resin liquid to 25 kg. This resin liquid is prepared by adding, for example, three times as much water to a mixture of, for example, two parts polyethylene and eight parts vinyl acetate, and stirring and mixing the mixture. Ethylene-vinyl acetate copolymer can also be used in this resin liquid. If applied in this way, it will harden in about 6 hours and the surface will become hard, allowing light work to be done on top of it. Further, during this construction, a formwork may be placed 10 to 30 mm apart from the concrete surface, and the mortar material of the present invention may be poured between the formwork and the concrete. In the case of color coating, a mortar material containing a desired pigment may be applied. At this time, if the coating site is indoors or there is no risk of rain, it is sufficient to allow the coating to solidify as is, as described above. On the other hand, if the site to be coated is outdoors and there is a risk of rain, apply mortar material and
After ~4 hours, finish pressing with colored acrylic liquid to form a film on the mortar surface. Thereafter, discoloration of the surface of the mortar can be prevented by applying a water-soluble acrylic color stabilizer to the surface of the mortar using a roller or spray for a finishing coat. (Experiment example) First, mix 30 kg of blast furnace B cement and 20 kg of mineral furnace slag (product name NEM-B manufactured by Nippon Steel Cement Co., Ltd.).
This mixture and 60 kg of hard silica sand (trade name: Olivine Sand, manufactured by Toho Olivine Co., Ltd.) were homogeneously mixed and stirred to obtain a mortar main material. 0.1Kg is added to the mortar main material created in this way.
(0.2% for 50Kg) of adhesion additive (trade name Metrose, manufactured by Shin-Etsu Chemical Co., Ltd.) and 0.25Kg (0.5% for 50Kg) of tailing are mixed. Resin liquid 5 was added to 25 kg of mortar material thus obtained. This resin liquid is prepared by adding, for example, three times as much water to a mixture of, for example, two parts polyethylene and eight parts vinyl acetate, and stirring and mixing the mixture. This mortar material was applied to a thickness of 5 mm on concrete whose surface had been coated with a sealer approximately 10 microns thick, and hardened to obtain the following experimental results. Test items Mortar material strength test, adhesion test, freeze-thaw test. Test piece 40×40×160mm 3 pieces (bending/compression) 45×430×430mm 3 pieces (adhesion) 75×75×400mm 3 pieces (freeze-thaw) Test method (1) Bending strength/compressive strength test JIS According to R 5201. (2) Adhesion test A sealer was applied to the surface of a concrete (40 mm thick) plate, and the surface coated with the mortar material of the present invention to a thickness of 5 mm was cut to a depth of approximately 15 mm using a concrete core extractor (75 mm diameter). Then, the steel plate for adhesion test was glued with epoxy resin adhesive, and the temperature was 30°C at room temperature of 20°C.
After curing for one day, an adhesive force test was conducted using a center hole oil jack type portable adhesive force tester (capacity 1500 kg). Adhesive strength was determined using the following formula. Adhesive strength (kgf/cm ² ) = Breaking load (Kg) / Adhesive area (
cm ² ) (3) Freeze-thaw test ASTM C 666-75 (Test method for resistance of concrete specimens to rapid freeze-thaw in water)
The test was conducted in accordance with
It was carried out up to 200 cycles. Test Results The test results are shown in Tables 1 to 6.

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[Table] Surface observation At the end of 90 cycles, some flaking is observed on the surface of each specimen. Over the course of each test cycle from the end of the 90th cycle to the end of the 200th cycle, it is observed that the flaking of each specimen tends to gradually spread. *The weight measurement, relative dynamic elastic modulus measurement, and surface observation of each specimen were performed immediately after the end of each test cycle.

Claims (1)

[Claims] 1. After completely cleaning the concrete surface, a sealer is applied to the concrete surface to enhance adhesion, and then 60 to 70% by weight of cement and mineral furnace slag are applied.
A method of constructing mortar material by applying a predetermined thickness of mortar material made by homogeneously mixing hard sand with a diameter of 1 mm or less at a ratio of 0.8 to 1.5 times the weight to a mixture of 30 to 40% by weight. 2. Claim 1, characterized in that 0.3% or less of the adhesion additive and 0.7% or less of the tailing material are mixed with respect to the weight of the mixture of cement and mineral furnace slag.
Construction method of mortar material described in section. 3 After thoroughly cleaning the concrete surface, apply a sealer to the concrete surface to enhance adhesion, and then add 60 to 70% by weight of cement and furnace slag.
Mortar material is made by mixing a resin liquid into a mortar material made by homogeneously mixing 30 to 40% by weight of hard sand with a diameter of 1 mm or less at a ratio of 0.8 to 1.5 times the weight, and applying the mixture to a predetermined thickness. Construction method. 4. Claim 3, characterized in that 0.3% or less of the adhesion additive and 0.7% or less of the tailings are mixed with respect to the weight of the mixture of cement and mineral furnace slag.
Construction method of mortar material described in section.