JP4862001B2 - Super high strength and high durability self-leveling material and super high strength and high durability self-leveling material - Google Patents

Description

The present invention relates to an ultra-high-strength, high-durability self-leveling material and an ultra-high-strength, high-durability self-leveling material, and more specifically, higher strength development than conventional self-leveling materials, in particular, the ratio of water bonding material In an ultra-high strength region of 20.0% or less, an ultra-high-strength high-durability self-leveling material capable of obtaining a compressive strength exceeding 150 N / mm ² and this ultra-high-strength high-durability self-leveling material The present invention relates to a hardened body of ultra-high strength and high durability self-leveling material kneaded and cured with water.

Self-leveling material is a building material that has self-leveling properties (self-leveling and self-fluidity), and provides a high-level finish for a flat and smooth floor base surface that is more accurate than a trowel. It is a mortar material that enables large-area construction in a short period of time without relying on technology (skilled workers).
In recent years, with the increase in size and strength of structures, compressive strength and high durability exceeding 150 N / mm ² have been ensured for self-leveling materials while ensuring excellent fluidity and durability. It has been demanded.
By the way, in general, the compressive strength of mortar products, concrete structures and the like greatly depends on the quality of aggregates contained therein, particularly the quality of fine aggregates. Normally, natural river sand, mountain sand (land sand), sea sand, crushed sand, etc. are used as fine aggregates, but the problem of large variations in quality depending on the production area, host rock type, lot, etc. can be avoided. Absent. In particular, in extremely high strength areas where the compressive strength exceeds 150 N / mm ² , if poor quality fine aggregates are mixed into the specimen or structure, etc., fine bones with poor quality when external stress is applied. Stress concentrates on the part including the material and breaks at a strength lower than the strength that should be exhibited (expected), that is, a fine aggregate with poor quality becomes a structural defect.

Similarly, the fluidity of the self-leveling material is greatly influenced by physical properties such as fine aggregate density, particle shape, maximum particle size, particle size distribution, water absorption, etc. Especially, natural fine aggregate was used. In this case, the fluidity of the self-leveling material greatly depends on the quality of the fine aggregate used.
Therefore, blast furnace slag fine aggregate, ferrochrome slag fine aggregate, ferronickel slag fine aggregate, copper slag fine aggregate, as fine aggregate with high crushing strength (hardness) and wear resistance and stable quality, Various techniques using slag fine aggregate such as electric furnace oxidation slag have been proposed.

  For example, ultra-fine powder such as hydraulic substance (cement), silica dust (silica fume) and siliceous dust, high-performance water reducing agent, ferrochrome slag pulverized product pulverized to a particle size of about 5 mm or less, and ultra-high Strong aggregate composition (Patent Document 1), fine aggregate composed of slag spheres or slag subspheres, part or all of fine aggregates used as a constituent material of concrete or mortar by kneading with cement and water ( Patent Document 2), a ferroalloy slag made of ferroalloy slag such as ferrochrome slag, ferronickel slag, silicon manganese slag, ferromanganese slag, etc., which is crushed into a diameter of 5 mm or less and mixed with sand to form a concrete aggregate. Method of use (Patent Document 3), Ferronickel slag produced by air-crushing method with a particle size of 2.5 mm And a fine aggregate for high fluidity concrete (patent document 4) prepared by mixing the mixture ratio in the fine aggregate to 30% or more, a fine mineral powder consisting of a fine natural powder or a fine artificial mineral powder, And a mortar and concrete composition excellent in fluidity and strength expression using a fine aggregate lacking fine particles such as ferronickel slag fine aggregate having a particle size of 0.3 to 5 mm (Patent Document 5), cement, A high-strength mortar composition (Patent Document 6) composed of granular cement clinker, water reducing agent, aggregate having a specific gravity of 2.7 or more, ultrafine powder, and the like has been proposed.

According to these technologies, mortar or concrete excellent in strength and fluidity can be obtained, and ferroalloy slag such as ferrochrome slag, ferronickel slag, silicon manganese slag, ferromanganese slag, etc., which has been limited in use until now, can be obtained. There is an effect that it can be effectively used as a fine aggregate.
Japanese Patent No. 2653402 Japanese Patent Laid-Open No. 5-32439 Japanese Patent Laid-Open No. 5-262542 JP-A-8-325047 Japanese Patent Laid-Open No. 9-52744 JP 2005-119885 A

By the way, in the conventional well-known technique, since all the fine aggregates have a maximum particle size of 2.5 to 5 mm or have been subjected to a special spheroidizing treatment, these fine aggregates are used. In order to obtain compressive strength exceeding 150 N / mm ² when the self-leveling material is cured and cured in an ultra-high strength region with a water binder ratio of 20.0% or less to obtain a cured product. There was a problem that it was insufficient.

The present invention has been made in order to solve the above-described problems, and has higher strength development and higher durability than conventional self-leveling materials, and has a water bonding material ratio of 20.0%. An object of the present invention is to provide an ultra-high-strength high-durability self-leveling material and a super-high-strength high-durability self-leveling material cured body capable of obtaining a compressive strength exceeding 150 N / mm ² even in the following ultra-high strength region. To do.

As a result of intensive studies to solve the above-mentioned problems, the inventors of the present invention have an alite content of 60% by weight or more and 70% by weight or less, and a brain specific surface area of 4000 cm ² / g or more and 6500 cm ² / g and less cement a, and belite content 35 wt% or more and is 60 wt% or less and Blaine specific surface area of less than 3000 cm ² / g or more and 4000 cm ² / g cement B, a expandable material, BET method A hydraulic binder made of siliceous fine powder having a specific surface area of 1 m ² / g or more and 20 m ² / g or less, a maximum particle size of 1.2 mm or less, an absolute dry density of 2.90 g / cm ³ or more, and water absorption An ultra-high strength and highly durable self-leveling material containing an artificial high-density fine aggregate with a rate of 0.90% or less and a chemical admixture is kneaded with water at a water binder ratio of 20.0% or less. It was found that if cured, an ultra-high-strength, high-durability self-leveling material cured product having a compressive strength of 150 N / mm ² or more can be easily obtained, and the present invention has been completed.

That is, the ultra high strength and high durability self-leveling material of the present invention has an alite content of 60% by weight or more and 70% by weight or less and a brane specific surface area of 4000 cm ² / g or more and 6500 cm ² / g or less. and a, and belite content 35 wt% or more and is 60 wt% or less and Blaine specific surface area of less than 3000 cm ² / g or more and 4000 cm ² / g cement B, a expandable material, the specific surface area by the BET method A hydraulic binder composed of a siliceous fine powder of 1 m ² / g or more and 20 m ² / g or less, a maximum particle size of 1.2 mm or less, an absolute dry density of 2.90 g / cm ³ or more, and a water absorption of 0 .90% or less artificial high-density fine aggregate and a chemical admixture, and the hydraulic binder contains 5% by weight or more and 15% by weight or less of the cement A. B is 60% by weight or more and 70% by weight or less, the expansion material is mixed by 3% by weight or more and 7% by weight or less, and the siliceous fine powder is mixed at a ratio of 10% by weight or more and 30% by weight or less, The ratio between the unit volume of the artificial high-density fine aggregate and the unit volume of the hydraulic binder is 0.80 or more and 1.40 or less .

The artificial dense fine aggregate, ferronickel slag fine aggregate, copper slag sand, it is not preferable is an electric furnace one selected from the group of oxidized slag sand or two or more.

The ultra-high strength and highly durable self-leveling material cured product of the present invention is an ultra-high strength product obtained by kneading and curing the ultra-high strength and highly durable self-leveling material of the present invention with water at a water binder ratio of 20.0% or less. It is a high strength durable self-leveling material cured body,
The compressive strength of this ultra-high strength and highly durable self-leveling material is heated at 60 ° C. or higher and 80 ° C. or lower after 20 days at 20 ° C. or after the condensation of the self-leveling material is completed at 5 ° C. or higher. It is characterized by being 150 N / mm ² or more when cured under any condition of 24 hours.

According to the ultra-high strength and high durability self-leveling material of the present invention, the cement having an alite content of 60% by weight or more and 70% by weight or less and a brain specific surface area of 4000 cm ² / g or more and 6500 cm ² / g or less. and a, and belite content 35 wt% or more and is 60 wt% or less and Blaine specific surface area of less than 3000 cm ² / g or more and 4000 cm ² / g cement B, a expandable material, the specific surface area by the BET method A hydraulic binder composed of a siliceous fine powder of 1 m ² / g or more and 20 m ² / g or less, a maximum particle size of 1.2 mm or less, an absolute dry density of 2.90 g / cm ³ or more, and a water absorption of 0 .90% or less artificial high-density fine aggregate and chemical admixture , hydraulic binder, cement A 5 wt% to 15 wt%, cement B 60 wt% A unit of artificial high-density fine aggregate that is mixed at a ratio of not less than 70% by weight, not less than 3% by weight and not more than 7% by weight, and siliceous fine powder not less than 10% by weight and not more than 30% by weight. Since the ratio of the volume and the unit volume of the hydraulic binder is 0.80 or more and 1.40 or less, strength development and durability are excellent as compared with the conventional self-leveling material.
Moreover, in the ultra-high strength region where the water binder ratio is 20.0% or less, a compressive strength exceeding 150 N / mm ² can be obtained, which is superior in compressive strength and durability compared to conventional self-leveling materials. It has become a thing.

According to the cured body of the ultra-high strength and high durability self-leveling material of the present invention, it is not less than 60 ° C. and not more than 80 ° C. after the condensation of the self-leveling material is terminated at 20 ° C. for 28 days or at 5 ° C. or more. Since the compressive strength of the cured product when cured under any condition of 24 hours by heat curing is 150 N / mm ² or more, even in an ultra-high strength region where the water binder ratio is 20.0% or less A compressive strength exceeding 150 N / mm ² can be easily obtained. In addition, the compressive strength can be maintained over a long period of time, so that the long-term reliability is excellent.
Accordingly, it is possible to provide an ultra-high-strength and highly durable self-leveling material cured body that is excellent in compressive strength and durability as compared with the case where a conventional self-leveling material is used, and excellent in long-term reliability.

The best mode of the ultra-high-strength and highly durable self-leveling material and the ultra-high-strength and highly durable self-leveling material cured body of the present invention will be described.
The present embodiment is specifically described for better understanding of the gist of the invention, and does not limit the invention unless otherwise specified.

The ultra-high strength and high durability self-leveling material of the present embodiment is cement A having an alite content of 60% by weight or more and 70% by weight or less and a brain specific surface area of 4000 cm ² / g or more and 6500 cm ² / g or less. When a belite content 35 wt% or more and is 60 wt% or less and Blaine specific surface area of less than 3000 cm ² / g or more and 4000 cm ² / g cement B, a expandable material, the specific surface area by the BET method 1m ^A hydraulic binder composed of a siliceous fine powder of ² / g or more and 20 m ² / g or less, a maximum particle size of 1.2 mm or less, an absolute dry density of 2.90 g / cm ³ or more, and a water absorption of 0.8. It is an ultra-high-strength, high-durability self-leveling material comprising 90% or less artificial high-density fine aggregate and a chemical admixture.

Here, the ultra high strength and high durability self-leveling material of the present embodiment will be described in detail.
The cement A, alite _{(C 3 S: 3CaO · SiO} 2 / silicate tricalcium) content is 60 wt% or more and 70 wt% or less, and Blaine specific surface area of 4000 cm ² / g or more and 6500 cm ² / g or less early-strength Portland cement or ultra-early-strength Portland cement.
As the cement B, the content of belite (C ₂ S: 2CaO · SiO ₂ / dicalcium silicate) is 35% by weight or more and 60% by weight or less, and the brain specific surface area is 3000 cm ² / g or more and 4000 cm ² / Examples include low-heat Portland cement or moderately-heated cement of g or less.

In order to obtain the ultra-high-strength and highly durable self-leveling material of the present embodiment, it is possible to use inexpensive early-strength Portland cement for cement A and low-heat Portland cement containing a lot of belite for cement B. Particularly preferred.
Further, the mixing ratio of the cement A in the hydraulic binder is preferably 5% by weight or more and 15% by weight or less, and more preferably 10% by weight.
On the other hand, the mixing ratio of cement B in the hydraulic binder is preferably 60% by weight or more and 70% by weight or less, and more preferably 65% by weight.
When the mixing ratio of the cement A and B in the hydraulic binder is out of the above range, when the highly durable self-leveling material is hardened, the compressive strength is lowered and held at 150 N / mm ² or more. This is because it becomes difficult, and in some cases, the fluidity is significantly lowered and the practicality is greatly lowered.

As the expansion material, a calcium sulfoaluminate-based (ettringite-based) or lime-calcium sulfoaluminate composite expansion material conforming to Japanese Industrial Standards JIS A 6202 “Expansion material for concrete” is preferably used.
The mixing ratio of the expansion material in the hydraulic binder is preferably 3% by weight or more and 7% by weight or less, and more preferably 5% by weight.
When the mixing ratio of the expansion material in the hydraulic binder is out of the above range, the high durability self-leveling material containing the expansion material is cured and cured to obtain a high durability self-leveling material cured body. The amount of contraction cannot be guaranteed, or abnormal expansion occurs, which is not preferable.

The siliceous fine powder is a siliceous fine powder having a specific surface area of 1 m ² / g or more and 20 m ² / g or less by the BET method, for example, a zirconia-derived siliceous fine powder obtained as a by-product when producing electrofused zirconia. Silica fume obtained as a by-product when producing powder, silicon or ferrosilicon, siliceous fine powder obtained as a by-product when producing silica glass, amorphous siliceous material synthesized from silicon or silicon dioxide Fine pulverized powder, fly ash classified or finely pulverized to a particle size of 10 μm or less and having enhanced pozzolanic activity, etc.
Actually, in consideration of the specifications and price required for ultra-high strength and high durability self-leveling material, select one of the above various siliceous fine powders, or select and mix two or more. To use.

In particular, as a siliceous fine powder suitable for use in the ultra high strength and high durability self-leveling material of the present embodiment, the SiO ₂ content is 85% or more and the specific surface area by the BET method is 1 m ² / g or more. And zirconia origin siliceous fine powder and silicon origin silica fume of 20 m < ² > / g or less are mentioned.

The mixing ratio of the siliceous fine powder in the hydraulic binder is preferably 10% by weight to 30% by weight, and more preferably 15% by weight to 20% by weight.
When the mixing ratio of the siliceous fine powder in the hydraulic binder is out of the above range, the highly durable self-leveling material is cured by curing and curing the highly durable self-leveling material containing the siliceous fine powder. In this case, the compressive strength is reduced, and it becomes difficult to maintain the compressive strength at 150 N / mm ² or more. In some cases, kneading becomes difficult and the practicality is greatly reduced. Because.
Thus, the hydraulic binder of the present embodiment is a combination of the above cement A, cement B, expansion material, and siliceous fine powder.

Artificial high-density fine aggregate is a fine aggregate for imparting ultra-high strength and fluidity, as well as providing higher wear resistance, and has high hardness, excellent wear resistance, and maximum grain size. The diameter is 1.2 mm or less, the absolute dry density is 2.90 g / cm ³ or more, and the water absorption is 0.90% or less, preferably 0.70% or less.
Here, when any one of the maximum particle diameter, the absolute dry density and the water absorption rate of the artificial high-density fine aggregate is out of the above range, a highly durable self-leveling material including the artificial high-density fine aggregate is removed. In the case of a cured body, the compressive strength or fluidity is greatly reduced, which is not preferable.

As this artificial high-density fine aggregate, for example, ferronickel slag fine aggregate (Japanese Industrial Standard JIS A 501-2-2 FNS1.2 compliant product), copper slag fine aggregate (Japanese Industrial Standard JIS A 5011-3 CUS1.2 compliant product), electric furnace oxidation slag fine aggregate (Japan Industrial Standard JIS A 5011-4 EFS1.2 N or H compliant product) Can be used.
In addition, this artificial high-density fine aggregate is preferably in a dry state because it can be premixed with a hydraulic binder, a powdery chemical admixture or the like in advance.

The ratio of the unit volume of the artificial high-density fine aggregate and the unit volume of the hydraulic binder in the ultra high strength and high durability self-leveling material of the present embodiment is preferably 0.80 or more and 1.40 or less, more preferably Is 1.00 or more and 1.20 or less.
If the ratio of the unit volume of the artificial high-density fine aggregate and the unit volume of the hydraulic binder is out of the above range, the fluidity as the high-durability self-leveling material is reduced, or the high-durability self-leveling material This is because when the leveling material is cured and cured to obtain a highly durable self-leveling material cured body, the shrinkage becomes large and the practicality is greatly reduced.

As the chemical admixture, water-reducing agents such as general polycarboxylic acid-based high-performance water reducing agents and melamine sulfonic acid-based high-performance water reducing agents with a high water-reducing rate are preferably used, and if necessary, polyoxyalkylene alkyl ether-based It is preferable to use an antifoaming agent such as
The amount of the water reducing agent added is appropriately adjusted according to the target fluidity of the ultra-high strength and high durability self-leveling material. As general addition amounts, cement A and B, the expanding material and the siliceous fine particle are added. It is preferable to add in the range of 0.3 wt% or more and 3.0 wt% or less with respect to the total amount of the hydraulic binder made of powder.
The amount of the antifoaming agent is appropriately adjusted according to the target air amount of the ultra-high strength and high durability self-leveling material, but general addition amounts include cement A and B, expansion material and silica. It is preferable to add in the range of 0.01 wt% or more and 0.1 wt% or less with respect to the total amount of the hydraulic binder made of fine powder.

As the shape of this chemical admixture (water reducing agent and antifoaming agent), either powder or liquid can be used. In particular, a powdery material is preferable because it can be used by being premixed with a hydraulic binder, an artificial high-density fine aggregate previously dried, or the like.
In addition, in order to add various performances to the ultra high strength and high durability self-leveling material of this embodiment, a thickener, shrinkage reducing agent, synthetic resin powder, synthetic resin fiber, metal fiber, carbon fiber, glass fiber, You may add the 1 type (s) or 2 or more types selected from the group of a polymer, a monomer, an oligomer, a limestone fine powder, a fluidizing agent, a setting accelerator, a setting retarder, and a coloring pigment.

Next, the ultra-high-strength and highly durable self-leveling material cured body of this embodiment will be described.
The ultra-high-strength and highly durable self-leveling material cured body of this embodiment is obtained by kneading and curing the ultra-high-strength and highly durable self-leveling material of this embodiment with water at a water binder ratio of 20.0% or less. It is an ultra-high strength and highly durable self-leveling material cured body, and the compression strength of this ultra-high strength and highly durable self-leveling material cured at 20 ° C for 28 days, or when the self-leveling material is condensed at 5 ° C or higher. Is a cured product that becomes 150 N / mm ² or more when cured under any condition of 60 ° C. or more and 80 ° C. or less for 24 hours after termination.

The above-mentioned water binder ratio, that is, the weight ratio of the above-mentioned cement binders A and B, expansion material, siliceous fine powder and mixed water (the chemical admixture is regarded as water) is 20.0. % Or less is preferable.
Here, the reason why the water bonding material ratio of the ultra high strength and high durability self-leveling material is 20.0% or less is that when the water bonding material ratio exceeds 20.0%, the ultra high strength and high durability self-leveling material. This is because the compression strength of the ultra-high strength and highly durable self-leveling material cured product obtained by kneading the leveling material with water and curing is less than 150 N / mm ² .

This ultra-high strength and highly durable self-leveling material is kneaded with water at a water binder ratio of 20.0% or less, and the resulting mortar is self-leveling material at 20 ° C. for 28 days or at 5 ° C. or higher. After the coagulation is finished, it is cured under any condition of 60 ° C. or more and 80 ° C. or less for 24 hours to obtain an ultra-high strength and highly durable self-leveling material cured body.
The compression strength of the ultra-high-strength, high-durability self-leveling material cured body thus obtained always maintains 150 N / mm ² or more.

EXAMPLES Hereinafter, although an Example , a reference example, and a comparative example demonstrate this invention concretely, this invention is not limited by these Examples.

Here, the following were used as cement, expansion material, siliceous fine powder, artificial high-density fine aggregate, natural fine aggregate, chemical admixture, antifoaming agent and water.
"Cement A"
Hayashi Portland Cement (C ₃ S content 64%, C ₂ S content 7%, absolute dry density 3.15 g / cm ³ , brain specific surface area 4400 cm ² / g, manufactured by Sumitomo Osaka Cement Co., Ltd.) Abbreviated)
"Cement B"
Low heat Portland cement (C ₃ S content 26%, C ₂ S content 56%, absolute dry density 3.24 g / cm ³ , Blaine specific surface area 3400 cm ² / g, manufactured by Sumitomo Osaka Cement Co., Ltd.) (Abbreviation)

"Expanding material"
Calcium sulfoaluminate-based expansion material: SACS (absolute dryness 2.93 g / cm ³ , Blaine specific surface area 2900 cm ² / g, manufactured by Sumitomo Osaka Cement Co., Ltd.) (hereinafter abbreviated as EX)
"Silica fine powder"
Zirconia-derived siliceous fine powder: SF-SILICAFUME (SiO ₂ content 94.7%, absolute dry density 2.26 g / cm ³ , BET specific surface area 9.1 m ² / g, manufactured by Sakai Kogyo Co., Ltd.) , Abbreviated as ZSF)

"Artificial high-density fine aggregate A"
1.2 mm ferronickel slag fine aggregate (JIS A 5011-2 FNS 1.2 compliant product, maximum particle size 1.2 mm or less, absolute dry density 3.01 g / cm ³ , water absorption 0.7%, FM: 2 .21) (hereinafter abbreviated as FNS1.2)
"Artificial high-density fine aggregate B"
5 mm ferronickel slag fine aggregate (JIS A 501-2 FNS5 compliant product, maximum particle size 5 mm or less, absolute dry density 2.97 g / cm ³ , water absorption 0.9%, FM: 2.47) (hereinafter, (Abbreviated as FNS5)
"Artificial high density fine aggregate C"
1.2 mm copper slag fine aggregate (JIS A 5011-3 CUS1.2 compliant product, maximum particle size 1.2 mm or less, absolute dry density 3.35 g / cm ³ , water absorption 0.9%, FM: 2. 24) (hereinafter abbreviated as CUS1.2)

"Artificial high-density fine aggregate D"
5 mm copper slag fine aggregate (JIS A 5011-3 CUS5 compliant product, maximum particle size 5 mm or less, absolute dry density 3.30 g / cm ³ , water absorption 1.2%, FM: 2.64) (hereinafter, CUS5 Abbreviated)
"Artificial high density fine aggregate E"
1.2mm electric furnace oxidized slag fine aggregate (JIS A 5011-4 EFS1.2N compliant product, maximum particle size 1.2mm or less, absolute dry density 3.52g / cm ³ , water absorption 1.0%, FM: 2.89) (hereinafter abbreviated as EFS1.2)
"Artificial high density fine aggregate F"
5mm electric furnace oxidation slag fine aggregate (JIS A 5011-4 EFS5N compatible product, maximum particle size 5mm or less, absolute dry density 3.49g / cm ³ , water absorption 1.7%, FM: 3.10) (below , Abbreviated as EFS5)

"Natural fine aggregate G"
Aichi Prefecture dry silica sand No. 4 and No. 7 mixed sand (maximum particle size 1.2 mm or less, absolute dry density 2.66 g / cm ³ , water absorption 0.7%, FM: 2.46) (hereinafter SS1. (Abbreviated as 2)
"Natural fine aggregate H"
Chiba Prefecture mountain sand (maximum particle size 1.2 mm or less, absolute dry density 2.56 g / cm ³ , water absorption 2.28%, FM: 2.18) (hereinafter abbreviated as HS 1.2)

`` Chemical admixture ''
Polycarboxylic acid-based high-performance water reducing agent: SECIMENT 1200N (manufactured by Nippon Seika Co., Ltd.) (hereinafter abbreviated as SP)
"Antifoaming agent"
Seeker Anti-Form W (Nihon Seeca Co., Ltd.)
"water"
Tap water

Examples 1-4, Reference Examples and Comparative Example 1 using the above cement, expansion material, siliceous fine powder, artificial high-density fine aggregate or natural fine aggregate, high-performance water reducing agent, antifoaming agent and water -14 ultrahigh strength and high durability self-leveling materials were produced.
Table 1 shows the compositions of the ultrahigh strength and high durability self-leveling materials of Examples 1 to 4, Reference Examples and Comparative Examples 1 to 14.
In these ultra-high strength and high durability self-leveling materials, the target air volume is a constant value of 2% in all compositions, the type of fine aggregate, water binder ratio, mixing ratio of hydraulic binder, fine bone The unit volume ratio of the material and the hydraulic binder and the addition amount of the chemical admixture were as follows.

In Examples 1, 2, Reference Examples and Comparative Examples 1-5, the types of fine aggregates are all different, but the water binder ratio is 20.0%, and the mixing ratio of cement A (HC) in the hydraulic binder 10 wt%, cement B (LC) mixing ratio 65 wt%, expansion material (EX) mixing ratio 5 wt%, siliceous fine powder (ZSF) mixing ratio 20 wt%, fine aggregate and The unit volume ratio of the hydraulic binder is set to a constant value of 1.00, the amount of the high-performance water reducing agent (SP) added is 1.3% by weight with respect to the hydraulic binder, and the amount of the antifoam added is hydraulic. The amount was 0.05% by weight based on the binder.

In Example 3 , the same conditions as in Example 1 were used except that the mixing ratio of cement A (HC) in the hydraulic binder was 5 wt% and the mixing ratio of cement B (LC) was 70 wt%.
In Example 4 , the same conditions as in Example 1 were used except that the mixing ratio of cement A (HC) in the hydraulic binder was 15 wt% and the mixing ratio of cement B (LC) was 60 wt%.

In Comparative Example 6, the same conditions as in Example 1 were used except that the mixing ratio of cement A (HC) in the hydraulic binder was 0 wt% and the mixing ratio of cement B (LC) was 75 wt%.
In Comparative Example 7, the conditions were the same as in Example 1 except that the mixing ratio of cement A (HC) in the hydraulic binder was 20 wt% and the mixing ratio of cement B (LC) was 55 wt%.
In Comparative Example 8, the mixing ratio of cement A (HC) in the hydraulic binder is 12 wt%, the mixing ratio of cement B (LC) is 78 wt%, and the mixing ratio of siliceous fine powder (ZSF) is 5 wt%. The conditions were the same as in Example 1 except that%.

In Comparative Example 9, the mixing ratio of cement A (HC) in the hydraulic binder is 8 wt%, the mixing ratio of cement B (LC) is 52 wt%, and the mixing ratio of siliceous fine powder (ZSF) is 35 wt%. The conditions were the same as in Example 1 except that%.
In Comparative Example 10, the mixing ratio of cement A (HC) in the hydraulic binder is 10.7 wt%, the mixing ratio of cement B (LC) is 69.3% wt, and the mixing ratio of expansion material (EX) is The conditions were the same as in Example 1 except that the content was 0% by weight.
In Comparative Example 11, the mixing ratio of cement A (HC) in the hydraulic binder is 9.3 wt%, the mixing ratio of cement B (LC) is 60.7 wt%, and the mixing ratio of the expansion material (EX) is The conditions were the same as in Example 1 except that the amount was 10% by weight.

In Comparative Example 12, the same conditions as in Example 1 were used except that the unit volume ratio of the fine aggregate and the hydraulic binder was 1.50.
In Comparative Example 13, the same conditions as in Example 1 were used except that the unit volume ratio of the fine aggregate and the hydraulic binder was 0.70.
In Comparative Example 14, the water binder ratio is 22.0%, the addition amount of the high-performance water reducing agent (SP) is 0.9% by weight with respect to the hydraulic binder, and the addition amount of the antifoaming agent is the hydraulic binder. The same conditions as in Example 1 were used except that the content was 0.04% by weight.
In addition, about the high performance water reducing agent (SP) and the antifoamer, it considered that it was mixing water and correct | amended the water quantity.

Next, a kneading test of each of the ultra high strength and high durability self-leveling materials of Examples 1 to 4, Reference Examples and Comparative Examples 1 to 14 was performed.
Cement A and B, expansion material, siliceous fine powder, fine aggregate, mixing water, chemical admixture (SP) and antifoaming agent in a constant temperature room at 20 ° C. to have the composition shown in Table 1 The mixture was put into a 20 L hard polyethylene container, and high-speed stirring (mixing) was performed for 90 seconds using an electric hand mixer. In addition, the mixing amount of 1 batch was made into the constant value of 10L.

  Immediately after the completion of the work, in accordance with the Japanese Society of Architectural Standards JASS 15M-103 “Quality Standards for Self-Leveling Materials”, a flow cone made of vinyl chloride with an inner diameter of 50 mm and a height of 51 mm (content volume 100 ml) and a polished glass with a thickness of 5 mm The flow value was measured using a plate (flow plate), and the fluidity of the self-leveling material was evaluated.

In addition, for each of Examples 1 to 4, Reference Examples and Comparative Examples 1 to 14, in accordance with Japan Society of Civil Engineers standard JSCE-F 542-1999 “Testing method for bleeding rate and expansion rate of filling mortar”, ultrahigh strength and high durability The bleeding rate and expansion / contraction rate (age age 7 days) of the self-leveling material were measured.

Furthermore, using the ultra-high strength and high durability self-leveling material of each of Examples 1 to 4, Reference Example and Comparative Examples 1 to 14, a super high strength and high durability self-leveling material cured body was produced, The compressive strength, abrasion resistance, and impact resistance of each were measured.
As specimens for measuring compressive strength, 18 cylindrical specimens each having a diameter of 50 mm and a height of 100 mm were produced. In order to prevent evaporation of water, these specimens were sealed with vinyl film and rubber bands until just before demolding, and sealed and cured in a constant temperature room at 20 ° C. until 24 hours after water injection.

  Twelve of these specimens were demolded 24 hours after water injection, and were standardly cured in water at 20 ° C. until a predetermined age. The remaining 6 bottles were immersed in 70 ° C. warm water with the molds sealed after 24 hours of water injection, and heated and cured for 24 hours. The mixture was allowed to cool to room temperature and then demolded.

The compressive strength of the ultra-high-strength and highly durable self-leveling material was measured according to Japanese Industrial Standard JIS A 1108 “Concrete Compression Test Method”. Here, the number of specimens of one material age was six, and the coefficient of variation was calculated from the compression strength data of the six specimens measured. In addition, the age at which the compressive strength was measured was 7 days and 28 days in the case of standard curing, and 2 days in the case of heat curing at 70 ° C. In addition, about all the test bodies, both end surfaces were grind | polished just before performing a compression test.
Moreover, using the ultra-high-strength and high-durability self-leveling materials of Examples 1 to 4, Reference Examples and Comparative Examples 1 to 14, Japanese Industrial Standard JIS A 1453 “Abrasion test method for building materials and building components (polishing) A disk-shaped specimen having a diameter of 120 mm and a thickness of 20 mm in accordance with the paper method) is prepared and cured and cured in constant temperature and humidity at 20 ° C. and a relative humidity of 60%. A wear resistance test was performed under the condition of a load of 1000 g × 500 rotations in a constant temperature and humidity environment with a relative humidity of 50%.

Furthermore, the super high strength high durability self-leveling material of each of Examples 1 to 4, Reference Example and Comparative Examples 1 to 14 was subjected to surface polishing treatment with a wire brush, 300 mm long × 300 mm wide × 50 mm thick ultra high strength concrete cured. Body (water binder ratio 20.0%, air volume 2%, unit water volume 150 kg / m ³ , binder = low heat Portland cement: 750 kg / m ³ , fine aggregate = No. 3 silica sand: 601 kg / m ³ , coarse bone Material = hard sandstone crushed stone: 827 kg / m ³ , standard curing for 91 days, a 10 mm high vinyl chloride resin slab is installed on the edge of the hardened body), and the thickness of the self-leveling material is 10 mm. After lightly finishing the surface with a gold iron, it is cured and cured in constant temperature and humidity at 20 ° C. and a relative humidity of 60%. At 7 days of age, a 4 kg steel ball is cured by a self-leveling material. Were impact resistance tested to fall naturally by repeating 20 times than 2m above the surface of the.
Tables 2 and 3 show measurement results of JASS 15 flow, compressive strength, expansion / contraction rate, bleeding rate, abrasion resistance test, and impact resistance test of Examples 1 to 4, Reference Example and Comparative Examples 1 to 14, respectively. .

According to these measurement results, in Examples 1 and 2 and the reference example , the JASS15 flow of the obtained highly durable self-leveling material was about 230 mm, and the fluidity was very good. The compressive strength was also very good at 150 to 152 N / mm 2 at the age of 28 ° C. standard curing, and 158 to 161 N / mm 2 at the age of 2 days of 70 ° C. heating curing.
On the other hand, in Comparative Examples 1 to 3, the fluidity and compressive strength of the self-leveling material were lower than those of Examples 1 and 2 and the reference example . Further, since Comparative Example 4 used silica sand and Comparative Example 5 used mountain sand, both the fluidity and compressive strength of the self-leveling material were significantly lower than those of Examples 1, 2 and Reference Examples , and in particular, 20 ° C. standard. Curing age 28 days was below 150 N / mm ² .

Examples 3 and 4 are cases where the mixing ratio of cement A (HC) was 5% by weight and 15% by weight, but the fluidity of the obtained self-leveling material was good and the compressive strength was 20 ° C. standard. the age of 28 days of aging at the 151~154N / ^mm 2, 70 ℃ heat curing at the age of 2 days was as good as 158~161N / mm ^2.
In Comparative Example 6, since the mixing ratio of cement A (HC) was 0 wt% and the mixing ratio of cement B (LC) was 75 wt%, the fluidity of the self-leveling material was equivalent to that of Example 1. The compressive strength was less than 150 N / mm ² at the age of 28 ° C. standard curing. Moreover, the expansion / contraction rate of material age 7 contracted with -0.2%, and there was a problem as a self-leveling material.
In Comparative Example 7, since the mixing ratio of cement A (HC) was 20 wt% and the mixing ratio of cement B (LC) was 55 wt%, the compressive strength of the self-leveling material was equivalent to that of Example 1. The fluidity was significantly lower than that of Example 1.

In Comparative Example 8, since the mixing rate of the siliceous fine powder (ZSF) was 5% by weight, the compressive strength and fluidity of the self-leveling material were significantly lower than those in Example 1.
In Comparative Example 9, since the mixing rate of the siliceous fine powder (ZSF) was 35 wt%, the fluidity of the self-leveling material was better than that of Example 1, but the compressive strength was lower than that of Example 1, 20 It was less than 150 N / mm ² at the age of 28 days of standard curing at ° C.
In Comparative Example 10, since the mixing ratio of the expansion material (EX) was 0% by weight, the fluidity and compressive strength of the self-leveling material were equal to or higher than those in Example 1, but the expansion / shrinkage ratio at age 7 days was achieved. However, there was a problem with the quality of the self-leveling material.
In Comparative Example 11, since the mixing ratio of the expansion material (EX) was 10% by weight, the fluidity and compressive strength of the self-leveling material were lower than those in Example 1, and 150 N / mm at the age of 28 days at 20 ° C. standard curing. ^It was below ² . Further, the expansion / contraction rate on the age of 7 days was greatly expanded as + 0.8%, and there was a problem as the quality of the self-leveling material.

In Comparative Example 12, the compressive strength of the self-leveling material was equivalent to Example 1, but the unit volume ratio of the fine aggregate and hydraulic binder was 1.50, so the amount of fine aggregate was large, The fluidity was significantly lower than Example 1.
In Comparative Example 13, the fluidity and compressive strength of the self-leveling material were equal to or higher than in Example 1, but the unit volume ratio of the fine aggregate and hydraulic binder was 0.70, so the amount of the binder paste The expansion / shrinkage ratio at 7 days of age was shrinking to -0.2%, and there was a problem with the quality of the self-leveling material.
In Comparative Example 14, since the water binder ratio was 22.0%, the fluidity and compressive strength of the self-leveling material were significantly lower than in Example 1, and the compressive strength was always below 150 N / mm ² in any curing method. It was.

On the other hand, when the artificial high-density fine aggregate was used, the wear resistance was in the range of 0.8 to 1.3 g in all of Examples, Reference Examples and Comparative Examples, whereas natural fine aggregate was used. In Comparative Examples 4 and 5 using No. 1, the wear resistance was inferior, being as large as 1.9 to 2.2 g.
Moreover, as for the impact resistance, cracks occurred only in Comparative Example 13 in which the unit volume ratio of the fine aggregate and the hydraulic binder was 0.70 (the amount of the binder paste was large).

As explained above, self-leveling materials using artificial high-density fine aggregates with a maximum particle size of 1.2 mm (ferronickel slag fine aggregates, copper slag fine aggregates, electric furnace oxidized slag fine aggregates) Fluidity, compressive strength, and wear resistance superior to self-leveling materials using artificial high-density fine aggregates with a particle size of 5 mm or natural fine aggregates (silica sand, mountain sand) with a maximum particle size of 1.2 mm are obtained. It was also found that the coefficient of variation in compressive strength was very small.
When the mixing ratio of the cement A (HC) to the hydraulic binder is less than 5% by weight, the compression strength of the cured self-leveling material is low, while the mixing ratio of the cement A (HC) to the hydraulic binder is 15 In the case of exceeding the weight percent, it was found that the fluidity of the self-leveling material immediately after kneading was greatly reduced, and there was a problem in practical use.

When the mixing rate of the expansion material (EX) with respect to the hydraulic binder is less than 3% by weight, the shrinkage rate of the self-leveling material cured body is large, and when the mixing rate exceeds 7% by weight, the self-leveling is reversed. It has been found that the expansion coefficient of the cured material becomes too large and there is a problem in practicality.
When the mixing rate of the siliceous fine powder (ZSF) with respect to the hydraulic binder is less than 10% by weight, kneading becomes difficult and the practicality decreases, and when the mixing rate exceeds 30% by weight, It was found that the compressive strength of the self-leveling material was greatly reduced.
Furthermore, when the unit volume ratio of the fine aggregate and the hydraulic binder is less than 0.8, the shrinkage rate of the cured self-leveling material is large, the impact resistance is further lowered, and the unit volume ratio is 1. When exceeding 4, it turned out that the fluidity | liquidity of the self-leveling material immediately after kneading falls, and practicality falls significantly.

Furthermore, in order for the compressive strength to exceed 150 N / mm ² in both the standard curing age 28 days at 20 ° C. and the heating curing age 2 days at 70 ° C., the water binder ratio is 20.0%. The following are essential requirements:
The bleeding rate was 0% in all of the examples, reference examples and comparative examples, and there was no problem as a self-leveling material.

Claims (3)

Cement A having an alite content of 60 wt% or more and 70 wt% or less and a Blaine specific surface area of 4000 cm ² / g or more and 6500 cm ² / g or less, and a belite content of 35 wt% or more and 60 wt% less and and a Blaine cement specific surface area is less than 3000 cm ² / g or more and 4000 cm ² / g B, the expansion member and the BET specific surface area is ^{1 m} 2 / g or more and ^{20 m} 2 / g or less siliceous fine powder A hydraulic binder consisting of
An artificial high-density fine aggregate having a maximum particle size of 1.2 mm or less, an absolute dry density of 2.90 g / cm ³ or more, and a water absorption of 0.90% or less;
Containing chemical admixtures ,
The hydraulic binder is 5% by weight to 15% by weight of the cement A, 60% by weight to 70% by weight of the cement B, 3% by weight to 7% by weight of the expansion material, Silica fine powder is mixed at a ratio of 10 wt% or more and 30 wt% or less,
The ultra high strength and high durability self-leveling material, wherein the ratio of the unit volume of the artificial high density fine aggregate and the unit volume of the hydraulic binder is 0.80 or more and 1.40 or less . The artificial dense fine aggregate, claims, characterized in that ferronickel slag fine aggregate, copper slag sand, is one or more selected from a group of electric furnace oxide slag sand 1 ultra high strength and high durability self-leveling material according. An ultra-high-strength and highly durable self-leveling material cured product obtained by kneading and curing the ultra-high-strength and highly durable self-leveling material according to claim 1 or 2 with water at a water binder ratio of 20.0% or less. ,
The compressive strength of this ultra-high strength and highly durable self-leveling material is heated at 60 ° C. or higher and 80 ° C. or lower after 20 days at 20 ° C. or after the condensation of the self-leveling material is completed at 5 ° C. or higher. An ultra-high-strength, high-durability self-leveling material cured body characterized by having a curing rate of 150 N / mm ² or more when cured under any of the conditions of 24 hours.