KR100912638B1 - Mortal composition - Google Patents

Abstract

The mortar composition is provided to increase the intensity and the working efficiency by sharing with the concrete, the slag, and the filler etc. The mortar composition includes the urethane resin of 30~45 weight%, the slag of 15~20 weight%, the filler of 20~25 weight% and the silica of 15~25 weight%. The filler includes the cement of 50~60 weight%, the fill light or the elite of 30~40 weight% and the calcium hydroxide of 10~20 weight%. The urethane resin comprises the theme of 50~60 weight% and the hardener of 40~50 weight%. The average particle diameter of the silica is 0.6nm or less. The average particle diameter of slag is 0.6nm or less and the unit volume mass is 2.4g/cc or greater.

Description

Mortar composition

The present invention relates to a mortar composition used as a finishing material, such as concrete buildings, and more particularly, to a more environmentally friendly mortar composition because it has a long life and does not elute the harmful performance when exposed to water.

The concrete surface, after the concrete is poured, the aggregate contained in the concrete falls down and separates, and a large amount of moisture comes to the surface. This bleeding is called bleeding. This bleeding is accompanied by fine materials (such as stone and impurities) contained in concrete and brought to the surface, and these fines are left on the concrete surface to reduce the strength of the concrete surface, thereby reducing wear resistance. Since dust is generated, the concrete finish surface is not beautiful, so the function of the floor of the building is degraded. Because of this phenomenon, it is reinforced on the concrete surface by using a finishing material using epoxy or the like.

Existing concrete finishes are mainly made of oil-based epoxy products. However, strong solvents have strong smells, which are very dangerous to the health of workers and neighboring residents. It is very inappropriate between places where food and beverages are handled, such as production plants and storage.

In addition, the existing epoxy finish has excellent adhesion with concrete, but the strength of the material itself is too great and the coefficient of thermal expansion is so large that it is separated from the interface with concrete and epoxy finish so that the service life is not long. There is a shortcoming that needs to be repaired frequently. In addition, organic solvents are often used in combination to increase fluidity, which has environmental and health problems.

Another method used as a concrete finishing material is a hardner mixed with pigments in cement powder, which has a disadvantage that the surface color is very turbid and poor, and the finish is not beautiful due to discoloration. In particular, hardeners have a tendency to decrease due to many construction constraints that they must be used immediately after concrete is laid before concrete hardening.

Accordingly, the present invention is to provide a mortar composition that is excellent in adhesive strength with concrete but not easily detached from concrete and has a long lifespan and is environmentally friendly.

The present invention provides a mortar composition comprising 30 to 45% by weight of urethane resin, 15 to 20% by weight of slag, 20 to 25% by weight of filler and 15 to 25% by weight of silica sand as a first preferred embodiment.

In the above embodiment, the urethane resin may include 50 to 60 wt% of the main ingredient and 40 to 50 wt% of the curing agent.

In the above embodiment, the filler may include 50 to 60% by weight of cement, 30 to 40% by weight of ceramic mineral and 10 to 20% by weight of slaked lime.

In this case, the ceramic mineral may be a fillite or an illite.

In the above embodiment, the silica sand may have an average particle diameter of 0.6 mm or less.

In the above embodiment, the slag may have an average particle diameter of 0.6 mm or less and a bulk density of 2.4 g / cc or more.

The present invention provides a wall constructed with the above mortar composition in a second preferred embodiment.

In another aspect, the present invention provides a flooring material constructed with the above mortar composition.

The present invention does not use a solvent at all, there is no poisonous smell, less impact on the working environment, there is no risk of fire, excellent adhesion with concrete, including slag, fillers and the like behaves like concrete and excellent work performance It is possible to provide a mortar composition that exhibits excellent strength and excellent wear resistance and can provide long-life walls or floors.

In addition, the present invention can exhibit a stable physical properties even at low temperatures and high temperatures, especially when exposed to water can provide an environmentally friendly mortar composition does not dissolve harmful substances.

Hereinafter, the present invention will be described in more detail.

The present invention provides a mortar composition comprising 30 to 45% by weight of urethane resin, 15 to 20% by weight of slag and 20 to 25% by weight of filler as a first preferred embodiment.

Aqueous urethane, which is the main binder used in the present invention, has excellent adhesion with concrete floor, excellent strength, shows excellent stability when used from low temperature to high temperature, and has strong resistance to chemicals.

Mortar composition of the present invention may be to include 30 to 45% by weight of the urethane resin in consideration of the appropriate strength, physical properties and workability, if it exceeds 45% by weight, the fluidity is increased but the transition may come to the sample in the curing state If it is less than 30%, the workability may decrease and the beauty of the color of the surface may decrease.

The urethane resin may include 50 to 60% by weight of the main ingredient and 40 to 50% by weight of the curing agent in the total composition in consideration of the strength and workability.

In addition, the slag may include 15 to 20% by weight, in particular, the slag used in the present invention is a very hard sphere of 0.6mm or less, expressing excellent wear resistance and flow performance, the surface strength is better than the existing products and work Excellent in sex In consideration of workability, the slag may have a bulk density of 2.4 g / cc or more. The slag used in the present invention is an industrial waste resource generated in the steelmaking industry, and took advantage of resource redevelopment and environment-friendly by actively utilizing waste resources.

Furthermore, the slag used in the mortar composition of the present invention is made of unstable molten steel slag (50 million tons in Korea, 1.2 billion tons in the world) as a raw material, which is a new method. Atomizing Technology) You can use PS Ball (75% of the treated slag is converted into PS Ball), which is an eco-friendly product with a stable spinel structure. The PS Ball is a stable complex oxide with a spinel structure, which is very robust, has strong weathering resistance and corrosion resistance, and is difficult to move ions or electrons required for chemical reactions to form a stable compound and very resistant to chemical and physical factors such as weathering. Has strong resistance. In addition, if the SAT method is used, free CaO, which is a problem of steel slag, is changed to particles that do not dissolve, causing no pollution problem.

The chemical composition of the slag used in the mortar composition of the present invention is shown in Table 1 below, the heavy metal dissolution test results are shown in Table 2.

  division                               Chemical composition (%) SiO ₂  T-CaO  F-CaO Al ₂ O ₃  MgO  TiO₂  MnO           Fe  T-S P ₂ O ₅ Total Metal FeO Fe ₂ O ₃ Slag 25.8 45.7 0.53 12.2 9.0 0.4 0.9 1.3 0.1 1.2 0.6 0.44 0.015

Regulated Substance Acceptance criteria (ppm) PS Ball (ppm) Remarks Pb 35 ND  Analysis based on waste process test method Source: Korea Testing Institute: Ecomeister Cu 50 ND As 70 ND Hg 60 ND CD 80 ND Cr ⁶⁺ 145 ND CN 75 ND

ND: No Detected

In addition, spherical slag, which is an aggregate with excellent workability and wear resistance, is mixed with various grades of silica sand to increase fluidity, eliminating the need for solvents, and is environmentally friendly and can provide excellent surface strength and workability. have. In consideration of this point, the silica sand may be further included in 15 to 25% by weight, it is preferable that the average particle diameter is 0.6mm or less. If it exceeds 25%, the fluidity decreases and surface strength begins to decrease, and if less than 15%, aggregate may be separated.

In addition, the mortar composition of the present invention includes a filler, which has a property of reacting with water to form hydrated crystals, and using this property, the filler absorbs and reacts the water remaining after the reaction of the aqueous urethane base and the curing agent. By suppressing the generation of carbon gas, it has a more stable structure.

Such a filler may be included in the mortar composition of the present invention 20 to 25% by weight, which is a workability is reduced when the filler content exceeds 25% by weight, considering that the aggregate is separated when less than 20% by weight. .

The filler may include 40 to 60% by weight cement, 30 to 40% by weight ceramic mineral and 10 to 20% by weight of slaked lime.

In this case, the ceramic mineral may be a fillite or an illite.

The phyllite is a metamorphic rock with intermediate properties between slate rock and crystalline schist rock, which is a natural rock, and is a very fine and convenient mineral. It is usually black from clay or heterogeneous sedimentary rocks, and consists of quartz, feldspar, dolomite, chlorite, calcite, and quartz. It is also green with tuff as primary rock, and is composed of quartz, feldspar, green stone, sulphite and calcite.

In addition, the illite is a mica mineral and is close to dolomite.

In addition, pigments of various colors may be used to express a beautiful color on the surface.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the scope of the present invention is not limited to the following Examples.

<Examples 1-4>

The mortar composition was prepared by mixing the materials in the ratio of Table 3 below.

Example One 2 3 4 Urethane resin 30 35 35 35 Mineral fillers 25 25 20 25 Slag 20 20 20 15 Quartz sand 23 18 23 23 Etc 2 2 2 2

(Unit: weight%)

As the urethane resin, an aqueous modified urethane (subject: curing agent = 4: 3) was used, and the main one of the aqueous urethane resins was a polyester polyol and a rapeseed oil derivative in a polyhydroxy compound of the modified urethane resin. Emulsion gel was added to Eagle polyol to emulsify with water, and then various additives and pigments were added and dispersed.

Polymer isocyanate was used as a curing agent.

subject

    Polyester polyol (self-synthesis): 30 ~ 40 wt%

    Castor oil (manufactured by Rizinusoel I Dro): 5 to 15% by weight

    Emulsifier (NP -182, Southeast Synthetic Supply): 3 ~ 5 wt%

    Water: 25-30 wt%

    Pigment (TiO2: Manufacturer: Dupont): 10 ~ 12 wt%

    Additives (defoamers, thickeners, etc.): 2 to 5% by weight

Hardener

    Polymer isocyanate: 100% by weight

    Manufacturer: Miles Modur C.D

As inorganic filler, cement (Alberg back cement, Malaysia, supplied by Chemius Korea) 50% by weight, fillite (Examples 1 to 2, 270mesh, Gunsan Seoksan) or illite (Examples 3 to 4, inside The surface area 80 ~ 150m2 / g BM TECH supply 36% by weight, calcined lime (325 mesh for industry, manufactured by Chungmu Chemical) 14% by weight was used.

For better surface strength, spherical slag was mixed with silica sand, and the spherical slag was treated with the slag automizing technology to spin the slag of the unstable structure generated in the steelmaking industry of the steel mill using spinel (Spinel). As a complex compound having a stable molecular structure of the present invention, the present invention increases the added value by utilizing waste resources. In addition, the slag has a very good wear resistance, while the spherical structure has a very good effect on the urethane flooring (mortar) to spread well, greatly improving the working performance.

The spherical slag had an average particle diameter of 0.6 mm or less, a bulk density of 2.4 g / cc or more, and an Eymeister feed product was used. .

The other ingredients were used as the pigment, Chrome Chrome G-5 (manufacturer: Bayer).

The mortar composition prepared in Example was tested by plastering a thickness of about 3 mm on a concrete surface of 210 kg / m 2 strength. According to the KSF 2476 polymer cement mortar test method and the tensile strength test method of KSL 5104 hydraulic cement mortar, the results are shown in Table 4, and the results of requesting Example 3 to the Korea Institute of Construction Quality Testing, an authorized institution Same as 2.

Item One 2 3 4 Compressive strength (N / mm2) 48.9 50.4 53.2 51.5 Flexural strength (N / mm2) 13.5 14.4 14.8 14.0 Tensile Strength (N / mm2) 8.2 9.1 9.6 8.7 Adhesive Strength (N / mm2) 2.5 2.9 3.2 2.8 Workability (visual) Trowel Medium Flow able Flow able

In order to test long-term durability, stability to outdoor air exposure, one of durability, was tested.

In the test method, urethane mortar and epoxy mortar were plastered on the exposed concrete floor with thickness of about 3mm and about 2m2, and it was exposed to the outside for about 14 months for long-term exposure to adaptation to concrete expansion and winter concrete shrinkage in summer. The adhesive state and the like were evaluated by hitting with a naked eye and a hammer.

Test body Adhesive State change by hammer hit Mortar of Example 1 Good adhesion on all sides Only hit area is damaged Conventional Epoxy Mortar Dropout at the edge of specimen Significant damage occurs / progresses at the center of impact

The working performance (fluidity) was different depending on the ratio of water-based urethane resin and aggregate (slag and silica sand), and it was found that the better the working performance was, the higher the amount of resin used and the higher the ratio of slag. have.

As the use of slag increases, the compressive strength increases and workability increases.

As the urethane resin content is increased, the workability is good and the surface is polished, and as the urethane resin content is increased, the strength is increased to act as a main binder.

1 is a result obtained by measuring the compressive strength, flexural strength and tensile strength of the mortar composition according to the preferred embodiment of the present invention commissioned by the Korea Institute of Construction Quality Test for a concrete plate with a mortar composition prepared according to Example 3 ,

Figure 2 is a result of measuring the adhesion strength requested by the Korea Institute of Construction Quality Testing for a concrete plate with a mortar composition prepared according to Example 3 of the mortar composition according to an embodiment of the present invention.

Claims (7)

30 to 45 weight percent urethane resin, 15 to 20 weight percent slag, 20 to 25 weight percent filler and 15 to 25 weight percent silica sand, The filler is mortar composition, characterized in that it comprises 50 to 60% by weight of cement, 30 to 40% by weight of a ceramic or mineral, and 10 to 20% by weight of slaked lime. The method of claim 1, The urethane resin is mortar composition, characterized in that it comprises 50 to 60% by weight of the main ingredient and 40 to 50% by weight of the curing agent. delete delete The method of claim 1, Silica sand mortar composition characterized in that the average particle diameter is 0.6mm or less. The method of claim 1, The slag is a mortar composition characterized in that the average particle diameter is 0.6mm or less and the bulk density is 2.4g / cc or more. The wall constructed with the mortar composition of any one of Claims 1, 2, 5, or 6.

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