JP4438449B2 - High strength hydraulic composition - Google Patents

Description

  The present invention relates to a high-strength hydraulic composition excellent in high strength and abrasion resistance.

  As an abrasion-resistant cement composition cement containing an abrasion-resistant aggregate, Patent Document 1 discloses an abrasion-resistant cement composition containing a fluidizing agent and an abrasion-resistant aggregate.

JP-A-6-122536

The present invention is excellent bending strength, wear resistance and surface hardness, and an object thereof is to provide a high-strength hydraulic composition having excellent flowability.

Inventors found alumina cement, Portland cement, a hydraulic component comprising gypsum and blast furnace slag, the inclusion of certain aggregate, bending strength, to improve abrasion resistance and surface hardness, the Completed the invention.

The present invention is a high-strength hydraulic composition comprising a hydraulic component and a high-hardness aggregate,
Hydraulic components include alumina cement, Portland cement, gypsum and blast furnace slag,
The high-hardness aggregate is to provide a high-strength hydraulic composition comprising at least one component selected from spinel forsterite and electric furnace oxidation slag.
Preferably, the present invention is a high strength hydraulic composition comprising a hydraulic component and a high hardness aggregate,
Hydraulic components include alumina cement, Portland cement, gypsum and blast furnace slag,
It is to provide a high-strength hydraulic composition characterized in that the high-hardness aggregate contains spinel forsterite.
Preferably, the present invention is a high strength hydraulic composition comprising a hydraulic component and a high hardness aggregate,
Hydraulic components include alumina cement, Portland cement, gypsum and blast furnace slag,
It is to provide a high-strength hydraulic composition characterized in that the high-hardness aggregate contains an electric furnace oxidation slag.

The preferable aspect of the high intensity | strength hydraulic composition of this invention is shown below.
The high-strength hydraulic composition of the present invention preferably contains 40 to 300 parts by mass of an aggregate containing a high-hardness aggregate with respect to 100 parts by mass of the hydraulic component.
In the high-strength hydraulic composition of the present invention, the hydraulic component may contain 120 parts by mass or less of Portland cement, 30 to 100 parts by mass of gypsum, and 50 to 250 parts by mass of blast furnace slag with respect to 100 parts by mass of alumina cement. preferable.
The high-strength hydraulic composition of the present invention preferably further contains a thickener, a water reducing agent and an antifoaming agent.

The present invention is excellent bending strength, wear resistance and surface hardness, excellent fluidity, it is possible to provide a high-strength hydraulic composition.

One of the important requirements that the self-leveling material should have is that it has an appropriate rapid hardening property, but the rapid hardening property primarily depends on the type of hydraulic component contained. The Portland cement system has the disadvantages that the curing speed is slow and the drying shrinkage is large, while the fast-curing cement system has an improvement in terms of the curing speed, but has the disadvantages that the fluidity is low and the strength is low. Have.
In the high-strength hydraulic composition of the present invention, the use of hydraulic components made of alumina cement, Portland cement, gypsum and blast furnace slag compensates for each other's drawbacks and solves this problem.
The hydraulic component is (A) 100 parts by mass of alumina cement,
(B) Portland cement is preferably 120 parts by mass or less, more preferably 5 to 115 parts by mass, more preferably 10 to 110 parts by mass, particularly preferably 20 to 100 parts by mass,
(C) The gypsum is preferably 30 to 100 parts by mass, more preferably 33 to 95 parts by mass, more preferably 35 to 90 parts by mass, particularly preferably 40 to 80 parts by mass,
And (D) It is preferable that blast furnace slag contains 50-250 mass parts, More preferably, it is 60-220 mass parts, More preferably, it is 70-180 mass parts, Most preferably, it contains 80-140 mass parts.

Alumina cement has a potentially rapid hardening property, and gives a cured product excellent in chemical resistance and fire resistance after curing. In addition, due to the presence of blast furnace slag having latent hydraulic properties, a decrease over time in the strength of the cured body, which is a drawback thereof, is also suppressed. Alumina cement is commercially available is known several those mineral composition is different, but both major component is monocalcium aluminate (CA), from the viewpoint of strength and coloring, CA component number and C ₄ Alumina cement with a small amount of small components such as AF is preferred.
The alumina cement is preferably 10% by mass or more, more preferably 15% by mass or more, more preferably 20% by mass or more, particularly preferably from 25% by mass or more, preferably 100% by mass with respect to 100% by mass of the hydraulic component. In the following, it is preferable to include an amount in the range of 60% by mass or less, more preferably 50% by mass or less, and particularly preferably 40% by mass or less.

  As the Portland cement, ordinary Portland cement, early-strength Portland cement, or the like can be used. The use of Portland cement as the hydraulic component is preferable because it is effective in reducing costs, and if the amount added is too large, fluidity may be reduced, which may cause the generation of white flower. Preferably, 120 parts by mass or less is added to the part. Portland cement is preferably ordinary Portland cement.

  Gypsum is quick-hardening and functions as a component for maintaining dimensional stability after curing, but the amount added is preferably 30 to 100 parts by mass with respect to 100 parts by mass of alumina cement. If the amount is too small, the dimensional stability is lowered. If the amount is too large, the water resistance is lowered, and abnormal swelling due to water may occur. In addition, as for gypsum, each gypsum, such as anhydrous, semi-water, and 2 water, can be used as 1 type or a mixture of 2 or more types regardless of the kind.

  The blast furnace slag not only increases the crack resistance of the hardened body, but also has the effect of improving the hardened body strength of the alumina cement. The amount of blast furnace slag added is preferably 50 to 250 parts by mass with respect to 100 parts by mass of alumina cement. If the amount is too small, the shrinkage increases, and if the amount is too large, the strength may decrease.

In the high-strength hydraulic composition of the present invention, 40 to 300 parts by mass, preferably 50 to 200 parts by mass, more preferably 60 to 150 parts by mass of the aggregate containing the high hardness aggregate with respect to 100 parts by mass of the hydraulic component. Particularly preferably, it is preferable to contain 70 to 100 parts by mass.
The aggregate containing the high hardness aggregate is preferably 50 mass% or more, more preferably 60 mass%, more preferably 70 mass%, particularly preferably 80 mass% with respect to 100 mass% of the aggregate. by including, bending strength, excellent abrasion resistance and surface hardness.

As the high-hardness aggregate, spinel forsterite and electric furnace oxidation slag can be used alone or in combination.
The particle diameter of the high hardness aggregate is preferably 1500 μm or less.

Spinel forsterite is composed mainly of MgAl ₂ O ₄ .Mg ₂ SiO ₄ and has high hardness and excellent wear resistance. Although it exists as a natural product, it can also be obtained artificially by cooling the slag produced as a by-product in the process of producing high carbon ferrochrome (FeCr), which is a raw material for stainless steel, and pulverizing, classifying and sizing. Both natural products and artificial products can be used.

Electric furnace oxidation slag is different from blast furnace slag obtained by cooling, pulverizing and classifying a blast furnace that produces pig iron, cooling the by-product slag obtained from the steelmaking process using the electric furnace, pulverizing, classifying and sizing It is the oxidation slag obtained by this. This main mineral composition consists of FeO, MgFeAlO ₄ and amorphous silicate.

Aggregates include fine silica aggregates such as quartz sand and quartzite powder, slag, fly ash, limestone, talc, kaolin, alumina powder, titanium oxide, aluminum hydroxide, mica, pyrophyllite, excluding high-hardness aggregates Further, known aggregates such as zeolite and silica gel can be used in combination.
As the aggregate, two or more kinds of aggregates having different particle size distributions can be mixed and used.
As the aggregate, a mixture of No. 5 silica sand, No. 6 silica sand, No. 7 silica sand and the like such as No. 5 silica sand and an aggregate such as silica sand having a smaller particle size than No. 5 silica sand can be preferably used.

In the high-strength hydraulic composition of the present invention, in order to obtain a high-strength cured product, it is necessary to lower the water / hydraulic component ratio, but to secure high fluidity by lowering the water / hydraulic component. It is preferable to add a water reducing agent.
In particular, the strength development of alumina cement, which is one of the hydraulic components in the present invention, is greatly affected by the water / cement ratio. Therefore, a water reducing agent can be used to reduce the water / hydraulic component ratio. preferable. Since addition of a water reducing agent tends to cause material separation, it is preferable to use a water reducing agent and a thickener in combination.
In the high-strength hydraulic composition of the present invention, the addition of a thickening agent and / or an antifoaming agent suppresses material separation and generation of bubbles on the surface of the cured body, and has a favorable effect on improving the appearance of the cured body. preferable.

As the water reducing agent, naphthalene-based, melamine-based, polycarboxylic acid-based, lignin sulfonic acid-based, and the like can be used, and a polycarboxylic acid-based one is preferable for an optimal combination with a thickener used in combination.
The addition amount of the water reducing agent can be added within a range not impairing the characteristics of the present invention, and is 0.01 to 1 part by mass, further 0.02 to 0.5 part by mass, with respect to 100 parts by mass of the hydraulic component, 0.05 to 0.20 parts by mass are particularly preferable.

As the thickener, a cellulose type such as methylcellulose and carboxymethylcellulose, a protein type such as gelatin and bectin, a water-soluble polymer type such as polyethylene glycol, polyethylene oxide, polyacrylamide, and polyvinyl alcohol, and a latex type can be used. Cellulose and the like can be used.
The addition amount of the thickener can be added within a range that does not impair the characteristics of the present invention, and is 0.01 to 0.5 parts by mass, more preferably 0.01 to 0.2 parts by mass with respect to 100 parts by mass of the hydraulic component. It is preferable to contain a mass part, especially 0.01-0.1 mass part. If the amount of the thickener added is increased, the fluidity may be lowered, which is not preferable.

The high-strength hydraulic composition of the present invention can contain an antifoaming agent for the purpose of improving the compressive strength, abrasion resistance, and surface state of the cured product.
As the antifoaming agent, known materials such as synthetic materials such as silicon-based, alcohol-based, polyether-based, mineral oil-based, and fluorine-based materials or plant-derived natural materials can be used.
The addition amount of the antifoaming agent can be added within a range that does not impair the characteristics of the present invention. The following is preferred. When the defoaming agent is added in a larger amount than the above, the defoaming effect may not be improved.

  The high-strength hydraulic composition of the present invention can be used by adding resin components such as particles, powders, emulsions (emulsions), and fibers. The high-strength hydraulic composition of the present invention may not contain resin components such as particles, powders, emulsions (emulsions), and fibers.

  In the high-strength hydraulic composition of the present invention, the setting rate adjusting agent can be appropriately added depending on the hydraulic composition as long as the characteristics are not impaired, the components of the setting accelerator and setting retarder, and the added amount In addition, the fluidity and pot life can be adjusted by appropriately selecting the mixing ratio.

  A known setting accelerator can be used as the setting accelerator. Examples of setting accelerators include inorganic and organic lithium salts such as lithium carbonate, lithium chloride, lithium sulfate, lithium nitrate, lithium hydroxide, lithium acetate, lithium tartrate, lithium malate, lithium citrate, and lithium oxalate. Lithium salt such as can be used. In particular, lithium carbonate is preferable from the viewpoint of effects, availability, and cost.

  As the setting retarder, a known setting retarder can be used. As an example of a setting retarder, sodium salts such as inorganic sodium salt and organic sodium salt such as sodium sulfate, sodium bicarbonate, sodium tartrate, sodium malate, sodium citrate, sodium gluconate can be used.

The high-strength hydraulic composition of the present invention can be used as a colored surface finish by adding a pigment.
The pigment is appropriately selected depending on the target color, but is preferably excellent in alkali resistance and weather resistance in view of the intended use of the cured product. It is preferable to use a pigment.
Inorganic pigments, for example, various kinds of iron, chromium, titanium, cobalt and other various metal oxides, hydroxides or sulfides with color names such as titanium white, bengara, titanium yellow, yellow ocher, etc. The thing of the color is marketed and can use a commercial item individually or as a mixed color which mixed multiple.

  In using the high-strength hydraulic composition of the present invention, the amount of water is preferably 23 to 30 parts by mass with respect to 100 parts by mass of the hydraulic component. If the amount of water is reduced below this appropriate range, an increase in compressive strength beyond that range cannot be expected, and the fluidity is greatly reduced, which is not preferable.On the other hand, if the amount of water exceeds this appropriate range, the compressive strength is greatly increased. This is not preferable because the surface condition such as color unevenness deteriorates.

  In the high-strength hydraulic composition of the present invention, the pot life at 20 ° C. is preferably 0.5 to 3 hours, more preferably 0.75 to 2.5 hours, particularly preferably 1 to 2 hours. In order to obtain a good workability and a surface-cured state.

  The high strength hydraulic composition of the present invention can obtain a mortar having a flow value of preferably 210 mm or more.

The high-strength hydraulic composition of the present invention has a compressive strength of 7 N days, preferably 40 N / mm ² or more, more preferably 50 N / mm ² or more, more preferably 60 N / mm ² or more, and particularly preferably 65 N / mm. A cured product of mm ² or more can be obtained.
High strength hydraulic composition of the present invention, compressive strength is preferably at an age of 28 days 60N / mm ² or more, more preferably 70N / mm ² or more, more preferably 76N / mm ² or more, particularly preferably 80 N / A cured product of mm ² or more can be obtained.

The high-strength hydraulic composition of the present invention obtains a cured product having a flexural strength of 7 N / mm ² or more, more preferably 6 N / mm ² or more, particularly preferably 7 N / mm ² or more at a material age of 7 days. Can do.
The high-strength hydraulic composition of the present invention has a bending strength of 28 N days, preferably 5 N / mm ² or more, more preferably 6 N / mm ² or more, more preferably 7 N / mm ² or more, and particularly preferably 7. A cured product of 5 N / mm ² or more can be obtained.

  The high-strength hydraulic composition of the present invention can provide a cured product having a surface hardness of one day of age of preferably 40 or more, more preferably 50 or more, more preferably 60 or more, and particularly preferably 70 or more.

The high-strength hydraulic composition of the present invention has an abrasion resistance of preferably 2 mm or less, more preferably 1.8 mm or less, more preferably 1.5 mm or less, particularly preferably 1.1 mm or less at 7 days of age. A cured product can be obtained.
The high-strength hydraulic composition of the present invention has an abrasion resistance of preferably 1.5 mm or less, more preferably 1.3 mm or less, more preferably 1.1 mm or less, particularly preferably 1 mm or less at an age of 28 days. A cured product can be obtained.

The high-strength hydraulic composition of the present invention can produce a mortar having a flow value of 210 mm or more. Using the mortar, the surface hardness is 40 or more at a material age of 1 day, and the compressive strength is 40 N / mm at a material age of 7 days. ² above, 60N / mm ² or more in age of 28 days, 5N / mm ² or more in bending strength age of 7 days, 5N / mm ² or more in age of 28 days, 2 mm wear resistance at an age of 7 days Hereinafter, a cured product of 1.5 mm or less can be produced at a material age of 28 days.

The high-strength hydraulic composition of the present invention can be used for general buildings such as hospitals, schools, offices, condominiums, houses, factories, warehouses, parking lots, gas stations, convenience stores, and kitchens.
The high-strength hydraulic composition of the present invention can be used for floor foundation adjustment and finishing of general buildings such as hospitals, schools, offices, condominiums, houses, factories, warehouses, parking lots, gas stations, convenience stores and kitchens. it can.

  Hereinafter, the present invention will be described in more detail based on examples. However, the present invention is not limited by the following examples.

The method of evaluation is shown.
(1) Evaluation of mortar and cured product:
1) Flow value: The flow value of mortar is measured in accordance with JASS 15M-103.
2) Compressive strength (N / mm ² ), bending strength (N / mm ² ): The produced mortar is packed in a 4 × 4 × 16 cm mold shown in JIS R-5201, and the temperature is 20 ° C. and humidity After being cured in air at 65% for 24 hours, it is demolded and further cured in the air for a predetermined period (7 days, 28 days) to obtain a molded body. The molded body is measured according to the method described in JIS / R-5201.

3) Surface hardness: The mortar is poured into a 13 × 19 cm mold at a thickness of 10 mm, cured at a temperature of 20 ° C. and a humidity of 65%, and the surface hardness after 3 hours of placing is measured. The hardness is measured with a spring type hardness tester type D type.
4) Abrasion resistance (mm): Pour mortar into a 11 × 11 cm mold at a thickness of 10 mm, and after curing in air at a temperature of 20 ° C. and a humidity of 65% for 24 hours, demold, and then in air Period (7 days, 28 days) Additional curing is performed to obtain a molded body. For the wear test, a molded body whose height was precisely measured was used. A taper wear tester was used to perform a wear test of the molded body under the conditions of a wear wheel GC150H, a load of 250 g, and a rotational speed of 2000 times. Precisely measure the height of the molded body. The wear resistance is obtained by subtracting the height of the molded body after the abrasion test from the height of the molded body before the abrasion test. Height) ”value.
The height is measured using a dial gauge.

[ Reference Example 1, Example 2 and Comparative Example 1]
(1) Materials used: In carrying out each example, the following materials were used.
AC: Alumina cement (manufactured by Lafarge Aluminate, Blaine specific surface area 3600 cm ² / g, monocalcium aluminate content 55 wt%).
PC: Hayashi Portland cement (manufactured by Ube Mitsubishi Cement Co., Ltd .: Blaine specific surface area 4500 cm ² / g).
Gypsum: Type ^II anhydrous gypsum (manufactured by Central Glass Co., Ltd .: Blaine specific surface area 3300 cm ² / g).
Slag: Blast furnace slag (manufactured by Ube Mitsubishi Cement Co., Ltd .: Blaine specific surface area 4400 cm ² / g).
Aggregate A: Spinel forsterite (manufactured by Shunan Technochrome Co., Ltd., trade name: PS Sand No. 7).
Aggregate B: Electric furnace oxidation slag (manufactured by Daiichi Sangyo Chemical Co., Ltd., trade name: CK Hypergrid No. 1).
-Aggregate C: Mixed silica sand of No. 5 silica sand and No. 7 silica sand (manufactured by Miku Kaiun Co., Ltd.)
Water reducing agent: Polycarboxylic acid water reducing agent (manufactured by Kao Corporation).
-Thickener: Methylcellulose thickener (Matsumoto Yushi Seiyaku Co., Ltd.).
-Antifoaming agent: Polyether type antifoaming agent (Asahi Denka Kogyo Co., Ltd.).

(2) Preparation of mortar:
Add water further to the hydraulic component in the ratio shown in Table 1 and the aggregate, water reducing agent, thickener and antifoaming agent in the ratio shown in Table 2 to 100 parts by mass of the hydraulic component. The mortar was obtained by kneading for a minute.
Using the obtained mortar, the flow value, compressive strength, bending strength, surface hardness and abrasion resistance were evaluated, and the results are shown in Table 3.
Further, as a result of visual observation of the surface state of the cured product obtained from the mortar, no white flower was observed on the surfaces of all the cured products.

The compositions of the present invention, the flow value required for self-flowing having a (flow value is 210mm or more mortar), the resulting cured product has a sufficient bending strength and high abrasion resistance, surface condition Is also excellent.

Claims (4)

A high strength hydraulic composition comprising a hydraulic component and a high hardness aggregate;
Hydraulic components include alumina cement, Portland cement, gypsum and blast furnace slag,
A high-strength hydraulic composition, wherein the high-hardness aggregate is a high-hardness aggregate made of spinel forsterite and electric furnace oxidation slag or a high-hardness aggregate made of electric furnace oxidation slag. 2. The high-strength hydraulic composition according to claim 1, comprising 40 to 300 parts by mass of an aggregate containing a high-hardness aggregate with respect to 100 parts by mass of the hydraulic component. Hydraulic components, based on the alumina cement 100 parts by weight Portland cement 120 parts by mass, 30 to 100 parts by weight of gypsum, according to claim 1 or 2, characterized in that it comprises a blast furnace slag 50 to 250 parts by weight High strength hydraulic composition. The high-strength hydraulic composition according to any one of claims 1 to 3 , wherein the high-strength hydraulic composition further includes a thickener, a water reducing agent, and an antifoaming agent.