JPH0222828B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for improving the surface finish of concrete floors. Conventionally, concrete has been used for the floors of buildings, but using it as is has problems with aesthetics, surface roughness, unevenness, etc., so it is rarely used except in factories, warehouses, etc. In general buildings, it is common to apply some kind of finish to the floor surface. There are two conventional methods of finishing concrete floors: (a) Method of pasting P tiles, long vinyl chloride flooring, carpets, etc. (b) Floor finishing methods such as mortar coating and synthetic resin coating. However, the pasting method and the synthetic resin coating method have the disadvantage that if the smoothness and planar precision of the base concrete are poor, the smoothness and planar precision of the finished floor will also be poor, resulting in poor floor appearance. In addition, in the case of mortar coating, the finished surface is not affected by the base material, but since the coating is applied with a trowel, uneven coating occurs, and the problem is that the smoothness is poor and it is difficult to maintain horizontal accuracy. By the way, a so-called self-leveling method has been developed as a method for improving the smoothness and horizontal accuracy of the base. This construction method involves pouring slurry-like mortar or paste with a high water ratio onto the floor surface to a thickness of approximately 5 to 20 mm, and utilizing the natural flowing nature of the slurry to form a smooth floor surface with good flatness. It's a method. The self-leveling materials (hereinafter referred to as SL materials) used in this method include gypsum-based materials that use hemihydrate gypsum or anhydrite as a binding material, and cement-based materials that use cement as a binding material.
Although the self-leveling method has the advantage of producing a smooth floor surface with good flatness as described above and is extremely easy to work with, it is unsuitable as a final surface finishing method for the following reasons. (a) Gypsum-based SL materials are not water resistant and cannot be used in areas exposed to water. In addition, the surface hardness is low and it is easily worn, so it cannot withstand long-term use. (b) Cement-based SL materials have excellent water resistance, but they wear more easily than ordinary concrete, and the surface peels off and generates dust after long-term use. The present invention provides a floor finishing method that eliminates the above-mentioned drawbacks of the conventional floor finishing method using cement-based SL material. After setting and hardening this, a surface hardening agent for mortar or concrete is applied. The cement-based SL material used in the present invention is not particularly limited, and any material that is normally used as an SL material can be used as appropriate. Examples of the cement-based SL materials include various cements such as Portland cement, blast furnace cement, fly ash cement, and ultra-fast hardening cement, mixed with expansive agents such as lime-based, CAS-based, and gypsum-based, fly ash, blast furnace slag, and differential silica. Examples include water reducing agents such as sulfonated modified resins of melamine formaldehyde condensates, water retaining agents such as methyl cellulose and glyoxal-added hydroxypropyl methyl, and, if necessary, sand. Note that an appropriate amount of an antifoaming agent may be added as necessary. The mixing ratio is 100 parts by weight of cement, 6 to 20 parts by weight of swelling agent, 6 to 25 parts by weight of admixture, and water reducing agent.
A mixture containing 0.5 to 3 parts by weight, 0.04 to 0.2 parts by weight of a water retention agent, and 80 to 180 parts by weight of sand is usually used. Furthermore, the surface hardening agent for mortar or concrete referred to in the present invention is an agent whose aqueous solution penetrates into the mortar or concrete and reacts with cement hydration products in the hardened mortar or concrete to form a dense layer on the surface. Sodium fluoride,
The main component is silica fluoride such as magnesium silica fluoride,
This is mixed with a surfactant and the like to impart permeability. In the present invention, the cement-based SL material is placed in a conventional manner. There is no particular restriction on the thickness of the SL material, but it is usually about 5 to 20 mm. Furthermore, a surface hardening agent for mortar or concrete may be applied by a conventional method. The amount of coating varies depending on the type of SL material, the type of surface hardening agent, and the location and environment of the floor surface formation, but it is usually about 200 g/m ² in terms of silicon fluoride. According to the floor finishing method of the present invention as described above, it is possible to finish a concrete floor with good smoothness and horizontal accuracy, a solid floor surface, and an excellent appearance.
Moreover, since there is no need to apply upholstery or coating to the floor surface, the construction period can be significantly shortened, and costs can be significantly reduced. Furthermore, the method of the present invention is a highly versatile method that can be applied to general office buildings, schools, hospitals, warehouses, and various other buildings. Next, test examples and examples of the present invention will be shown. Test Example Table 1 shows the results of the abrasion test on the surface of the flooring material according to the test example of the present invention. The wear test was carried out using Taber type wear test material according to JISA1453, the wear wheel was _H22 , the load was 1000g,
The amount of wear was measured at 500 revolutions. The surface hardening agent was applied 7 days after the SL material was cast, and the amount applied was 200 g/m ² in terms of silicon fluoride. As is clear from the results in Table 1, cement-based SL
When a surface hardening agent is applied to the hardened material, the abrasion resistance of the floor surface is significantly improved, creating a surface that is far more durable than the mortar finish of conventional methods. Furthermore, when a gypsum-based GL material was used, no significant effect was observed even when a surface hardening agent was applied.

[Table] The cement-based SL material with the following composition was used.

【table】

[Table] Unirap (trade name, manufactured by Onoda Kenzai Co., Ltd., main component: magnesium silica fluoride) was used as the surface hardening agent, and SL Plaster (trade name, manufactured by Yoshino Gypsum Co., Ltd.) was used as the gypsum-based SL material. Example The same cement-based SL material as that used in the test example was poured onto a 5 m x 10 m concrete slab on the laboratory floor with an average thickness of 10 mm. Seven days after pouring the SL material, half of the floor (5m x 5m) was coated with Unilap (manufactured by Onoda Kenzai Co., Ltd., main component is magnesium silicate fluoride) as a surface hardening agent.
was applied at a rate of 200 g/m ² (calculated as magnesium fluoride). The floor surface was used from the day after the hardening agent was applied. The surface of the area where the surface hardening agent was applied was glossy and had a beautiful finish. After half a year of use, in the areas where no surface hardening agent was applied, some of the sand on the surface became exposed and became rough, and dust generation was observed on the surface, but no dust was observed in the areas where the hardening agent was applied. The surface remained as smooth and glossy as it was immediately after application.

Claims (1)

[Claims] 1. A floor finishing method characterized by placing a cement-based self-leveling material on the surface of a concrete floor, curing it, and then applying mortar or a surface hardening agent for concrete.