JP2001261408A - Coating material for road - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a coating material for a road which is excellent in workability and pavement implementation, hardly shrinks and has satisfactory physical and chemical durability as well as impact resistance and wear resistance. SOLUTION: This coating material consists of a blended material containing at least cement, pozzolanic fine powder, an aggregate having a 2 mm or smaller particle size, water and a water reducing agent.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to various roads such as roads, sidewalks, runways and taxiways, and more particularly to the coating of road surfaces and road walls, especially for the marking of road surfaces. About materials.

[0002]

2. Description of the Related Art Signs and paintings written on road surfaces and road walls, such as roadways, sidewalks, runways, and taxiways, are exposed to rain, wind, snow, heat, ultraviolet rays, etc. In the above marking and painting, loads and impacts from passing vehicles are directly applied, so various phenomena such as damage, abrasion, cracking, peeling, fading, and deterioration may occur depending on the usage environment and coating material. Inevitably occurs. Inexpensive and easy-to-install solvent-based paints and cross-linking-type resins are sometimes used as coating materials used for marking and painting purposes such as road surfaces and road walls. Need to be re-painted in a short period of time. For this reason, although thermosetting synthetic resin with improved adhesion and durability is used, it requires considerable work for curing, such as using a burner flame at the time of curing, or requiring repeated application depending on the application location. Take it. In particular, in the case of a resin-based coating material, the shape stability at high temperatures and the abrasion resistance tend to be considerably low.

Although a mortar-based paint containing cement and a pigment (coloring amount) as main components is known to make up for such a drawback, it takes a long time to cure and the construction period becomes longer, so that it is actually used. Its application to existing roads is restricted. When the water content is reduced to shorten the curing time, the fluidity is also reduced and the workability deteriorates. In addition, since shrinkage occurs after painting, the sign is deformed, and cracks are more likely to occur in painted objects that are more firmly attached to the road surface or road wall. Furthermore, it was weak to impact load, and was easily chipped or damaged. As described above, the conventional coating materials have good workability, and have no sufficient durability and weather resistance regardless of the weather, weather conditions, and use conditions, and require frequent repairs and the like. .

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, has good workability and workability, hardly shrinks, and has sufficient physical and mechanical properties including impact resistance and abrasion resistance.
An object of the present invention is to provide a road coating material having chemical durability and capable of significantly increasing the interval for repairs compared to the conventional art.

[0005]

Means for Solving the Problems The present inventors have conducted intensive studies to solve the above-mentioned problems. As a result, the compounds represented by the following (1) to (9) have a high fluidity and almost shrink even after curing. The present inventors have found that extremely high strength and toughness can be exhibited without using such a composition, and when the composition was used as a road coating material, all of the above-mentioned problems were solved, thereby completing the present invention.

That is, the present invention provides (1) at least cement, fine pozzolanic powder, aggregate having a particle size of 2 mm or less, water,
And a blend containing a water reducing agent. (2) The road coating material according to (1), wherein the blend contains one or more of metal fibers, organic fibers, and carbon fibers. (3) The metal fiber has a diameter of 0.01
The road coating material according to the above (2), which is a steel fiber having a length of 1 to 1.0 mm and a length of 2 to 30 mm. (4) The organic fiber has a diameter of 0.005.
The road coating material according to (2), which is at least one fiber selected from vinylon fiber, polypropylene fiber, polyethylene fiber, and aramid fiber having a length of 1 to 30 mm and a length of 2 to 30 mm. (5) The road coating material according to (2), wherein the carbon fiber has a diameter of 0.005 to 1.0 mm and a length of 2 to 30 mm. (6)
The road coating material according to any one of (1) to (5), wherein the composition contains an inorganic powder having an average particle size of 3 to 20 μm. (7) The road coating material according to any one of (1) to (6), wherein the composition contains needle-like particles and / or plate-like particles having an average particle size of 1 mm or less.
(8) The road coating material according to any one of (1) to (7), wherein the composition contains a reflecting material and / or a pigment. (9) The road coating material according to (8), wherein the pigment is titanium oxide.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, the cement essentially contained in the composition is not particularly limited, and any cement can be used. For example, ordinary portland cement, early-strength portland cement, moderately heated portland cement,
Examples include various port send cements such as low heat Portland cement and mixed cements such as blast furnace cement and fly ash cement. In addition, when white cement is used, in the case of white marking or white painting, a pigment is not required, and the color development becomes vivid even when used in combination with a pigment of another color, and the reflective ability is increased even when used in combination with a reflector. Recommended.

In the present invention, the pozzolanic fine powder essentially contained in the composition includes silica fume, silica dust, fly ash, slag, volcanic ash, silica sol,
Precipitated silica and the like. In general, silica fume and silica dust are preferable because the average particle size is 1.0 μm or less, and there is no need to pulverize by pulverization. When a pozzolanic substance having a relatively large particle size is used, it is preferable to grind the material in advance and adjust the average particle size to 1.0 μm or less.

[0009] By blending the pozzolanic fine powder, the cured product is densified by the microfiller effect and the cement dispersing effect, and the compressive strength is improved. On the other hand, when the added amount of the pozzolanic fine powder increases, the unit water amount needs to be increased. Therefore, the added amount of the pozzolanic fine powder is preferably 5 to 50 parts by weight based on 100 parts by weight of cement.

[0010] In addition, an aggregate having a particle size of 2 mm or less,
Preferably, an aggregate having a particle size of 1.5 mm or less is essential. In this case, the particle size of the aggregate is a cumulative particle size of 85% (weight), and therefore, aggregates having a particle size of more than 2 mm may be included. When the amount of aggregate having a particle size of 2 mm or less with respect to the total aggregate amount decreases, the strength decreases. Therefore, the amount of aggregate having a particle size of 2 mm or less is preferably 50% by weight or more of the total aggregate amount.

[0011] In the present invention, a mixed sand composed of one or more of river sand, land sand, sea sand, crushed sand and silica sand has a particle diameter of 2 m.
m can be used as aggregate. The amount of this aggregate is
In order to enhance the strength and durability, the amount is preferably 50 to 250 parts by weight, more preferably 80 to 180 parts by weight, based on 100 parts by weight of cement.

Further, the composition of the present invention contains a water reducing agent. As the water reducing agent, a high performance water reducing agent or a high performance AE water reducing agent having a large water reducing effect is preferable, and any one of lignin-based, naphthalenesulfonic acid-based, melamine-based, and polycarboxylic acid-based ones can be used. . The amount of the water reducing agent to be added is preferably 0.5 to 4.0% by weight in terms of solid content with respect to cement in view of the fluidity and separation resistance of the composition, the strength after curing, and the cost. The water reducing agent may be in a powder form or a liquid form.

In the present invention, the amount of water to be indispensable is 1 to 100 parts by weight of cement based on the fluidity and separation resistance of the water-containing composition, the strength after hardening and the property stability.
It is preferably 5 to 40 parts by weight, more preferably 20 to 35 parts by weight. If the blending amount of water is less than 15 parts by weight, the fluidity decreases and kneading of the blend becomes difficult, and if it exceeds 40 parts by weight, the cured product shrinks remarkably, and the curable properties are also reduced, so neither is preferable. .

Further, in the present invention, from the viewpoint of increasing the bending strength of the cured product, especially improving the toughness and increasing the resistance to impact load, the cured product contains at least one of metal fibers, organic fibers and carbon fibers. It is preferred to use a formulation. Metal fibers include steel fibers and amorphous fibers.
In particular, steel fibers are recommended because they have high strength, are easily available, and are relatively inexpensive in terms of cost. Metal fiber
Those having a diameter of 0.01 to 1.0 mm and a length of 2 to 30 mm are preferred. If the diameter is less than 0.01 mm, it is easy to be cut by tension, and if the diameter exceeds 1.0 mm, the number of fibers contained in the cured product is drastically reduced at the same compounding amount, so that the strength and toughness are significantly reduced. Therefore, neither is preferable. On the other hand, if the fiber length exceeds 30 mm, fiber balls are likely to be formed during kneading, which is not preferable. If the fiber length is less than 2 mm, the adhesive strength to the matrix decreases, and the bending strength decreases, which is not preferable. The compounding amount of the metal fiber is preferably an amount corresponding to less than 4% of the volume of the cured product after setting, and more preferably an amount corresponding to less than 3.5%. If the blending amount is 4% or more, the fluidity decreases,
It is not preferable because workability is also reduced.

The organic fibers include vinylon fibers, polypropylene fibers, polyethylene fibers, and aramid fibers. The organic fibers and carbon fibers preferably have a diameter of 0.005 to 1.0 mm and a length of 2 to 30 mm. The amount of the organic fibers and / or carbon fibers is preferably less than 10%, more preferably less than 7%, of the volume of the cured product after coagulation.
If the amount is 10% or more, the fiber dispersibility and the strength are undesirably reduced.

Further, from the viewpoint of increasing the packing density after curing, suppressing shrinkage, and increasing durability, the compound is made of an inorganic powder having an average particle size of 3 to 20 μm, more preferably 4 to 10 μm. It is preferred to include. As the inorganic powder, quartz powder is particularly recommended because it is inexpensive and can sufficiently exhibit desired effects. The quartz powder is not limited as long as it is an inorganic powder containing silica as a main component in addition to crystalline or amorphous quartz as a natural mineral source. The compounding amount of the inorganic powder is preferably 50 parts by weight or less, more preferably 20 to 35 parts by weight, based on 100 parts by weight of cement. If the amount is more than 50 parts by weight, the fluidity of the compound decreases and the strength after curing decreases, which is not preferable.

The composition preferably contains needle-like and / or plate-like particles having an average major axis diameter of 1 mm or less in order to increase the toughness after curing. Examples of the acicular particles include those composed of natural or synthetic ores such as wollastonite, bauxite, and mullite, and examples of the plate-like particles include mica flake, talc flake, vermiculite flake, and alumina flake. be able to. The amount of the acicular and / or plate-like particles is preferably at most 35 parts by weight, more preferably 10 to 25 parts by weight, based on 100 parts by weight of cement. The amount is 3
If the amount exceeds 5 parts by weight, the fluidity of the composition may be reduced or the curability may be reduced, which is not preferable. The shape and dimensions of the acicular particles are desirably those having an acicularity, that is, a value of (major axis diameter / minor axis diameter) of 3 or more.

The composition according to the present invention may contain a pigment to develop a desired color. The pigment may be any known pigment used in porcelain, porcelain, etc., in addition to those used in mortar and concrete. Further, two or more pigments may be used in combination. It is more preferable to use titanium oxide as a pigment. Titanium oxide, in addition to a white-based coloring effect, often makes the chromatic coloring more vivid by being used in combination with other known pigments of a chromatic coloring source. Further, titanium oxide is preferable because it has a function of purifying pollutants and harmful substances such as nitrogen oxides and organic gases. The amount of the pigment is 2 to 10 parts by weight per 100 parts by weight of the cement. If the compounding amount is less than 2 parts by weight, the coloring power and the hiding power decrease, so that it is not preferable. If it exceeds 10 parts by weight, the coloring property itself is hardly improved.

Further, the composition of the present invention may contain a reflecting material in order to impart high light reflectivity to the painted product. Signs and coatings provided with high light reflectivity are preferred because they lead to improved visibility, especially at night. As the reflecting material, 1 as defined in JISR3301
Glass beads are preferred, but other large-diameter beads, high-refractive beads, plastic beads, and the like can be used alone or in combination of two or more. Other glass materials or broken or crushed waste glass may be used. The amount of the glass beads is 15 to 35 parts by weight per 100 parts by weight of the cement. The reflector may be used in combination with the pigment.

In the present invention, the composition contains, as necessary, other components other than the above components, such as a shrinkage reducing agent and an antifoaming agent, and especially the following types of admixtures. May be.

That is, when the inflating agent is included in the composition, the coating material does not shrink almost completely, which is good for preventing cracks and the like more reliably. If the expanding material is generally used for mortar or concrete,
Any one can be used. Preferably, a calcium oxide-based expanding material is used. The compounding amount of such an expanding material is preferably 3 to 15 parts by weight, more preferably 5 to 12 parts by weight, based on 100 parts by weight of cement. The amount is 3
When the amount is less than 15 parts by weight, the effect of compensating for the amount of shrinkage is hardly seen.
Either of them is not preferable because the strength may be reduced or the swelling may be broken.

When a thickener is included in the composition, workability, in particular, dripping at the time of marking or painting, can be prevented, and the marking can be easily performed at a fixed position. If the thickener is generally used for mortar and concrete,
Any one can be used. Preferably, methyl cellulose, hydroxyethyl cellulose, carboxymethyl cellulose and the like can be used. The compounding amount of such a thickener is 0.005 to 0.6 parts by weight, preferably 0.02 to 0.4 parts by weight in terms of solid content, based on 100 parts by weight of cement. Exceeding 0.6 parts by weight is not preferred because the fluidity decreases and the workability decreases. If the amount is less than 0.005 parts by weight, no compounding effect can be obtained, which is not preferable.

In producing the present coating material, the order of blending the components constituting the blend is not particularly limited. As an example, a method in which each component is put into a kneading machine at a time and kneaded, or a component other than water and a water reducing agent is premixed, and water and a water reducing agent are added to the mixture and kneaded, but a powdery water reducing agent is used. In such a case, there is a method of premixing the water reducing agent. Kneading is
Any kneading machine generally used in concrete production may be used, for example, an oscillating mixer,
A bread-type mixer, a twin-screw mixer, a tilting mixer, or the like can be used. The kneaded material can be used as the road coating material of the present invention.

The method for coating the road coating material of the present invention is not particularly limited, and can be handled almost in the same manner as ordinary paints, preferably inorganic paints. For example, a method using a spray gun or an airless pump, a method using a paint brush or a paint roller, or a manual operation using a brush or an iron may be used. The coating thickness is preferably about 1 to 8 mm from the viewpoint of durability and practicality. The coating material for roads of the present invention is suitable for painting and marking road surfaces and road walls such as roads, sidewalks, runways, and taxiways. It can also be used for painting structures and marking signs.

[0025]

Examples [Examples 1-4] Ordinary Portland cement (manufactured by Taiheiyo Cement Co., Ltd.), white cement (manufactured by Taiheiyo Cement Co., Ltd.), silica fume having an average particle size of 0.7 μm, silica sand No. 4 and No. 5 Mixed sand having a weight ratio of 2: 1;
Steel fiber with a diameter of 0.05 mm and a length of 2 mm, a commercially available polycarboxylic acid-based high-performance AE water reducing agent (liquid type), natural quartz powder with an average particle diameter of 7 μm, a major axis diameter of 0.3 mm and a major axis / minor axis Needle-like wollastonite having a diameter of about 4, calcium oxide-based expanding agent (trade name: EXPAN, manufactured by Taiheiyo Cement Co., Ltd.), methylcellulose-based thickener (San Nopco Co., Ltd.)
), A reflective material (particle diameter: 0.5 to 1.2 mm and a refractive index of about 1.
(Transparent glass beads of No. 5), a titanium oxide-based white pigment, and water were charged into a twin-screw kneading mixer at a mixing amount shown in Table 1 and kneaded.

[0026]

[Table 1]

The flowability of the kneaded material was evaluated by measuring the flow value according to a method according to JIS R 5201 "flow test", and the kneaded material was spray-coated on an asphalt road surface by a spray gun. According to the method according to JIS A 6909, the change in softness of the coated object (%)
The bond strength after drying for 14 days and the bond strength after immersion in salt water for 10 days were measured, and the presence or absence of abnormal wear resistance and impact resistance due to abrasion 10,000 times was examined. cm). In addition, WS Weather Meter 20
The presence or absence of weather resistance by irradiation for 00 hours was examined. The results are shown in Table 2.

[0028]

[Table 2]

Comparative Example 1 A commercially available cement-acrylic thick coating material was spray-painted on an asphalt road surface by an airless pump. According to the method according to JIS A6909, the change in softness (%) of the coated object,
The bond strength after drying for 14 days and the bond strength after immersion in salt water for 10 days were measured, and the presence or absence of abnormal wear resistance and impact resistance due to abrasion 10,000 times was examined. cm). In addition, WS Weather Meter 20
The presence or absence of weather resistance by irradiation for 00 hours was examined. The results are shown in Table 2.

Comparative Example 2 A commercially available epoxy resin-based solvent-based coating material was spray-painted on an asphalt road surface with a spray gun. After the coating, the coated surface was heated with a gas burner flame and cured. According to the method according to JIS A6909, the change in softness (%) of the coated object,
The bond strength after drying for 14 days and the bond strength after immersion in salt water for 10 days were measured, and the presence or absence of abnormal wear resistance and impact resistance due to abrasion of 10,000 times was examined. cm). In addition, WS Weather Meter 20
The presence or absence of weather resistance by irradiation for 00 hours was examined. The results are shown in Table 2.

[0031]

The road coating material of the present invention has good workability, can flexibly cope with various coating techniques, has good curability, and does not substantially shrink. In addition, after curing, it has particularly high strength and toughness, and has excellent physical durability such as impact resistance, load resistance, abrasion resistance, etc., and also has excellent chemical durability against water, salt, and even ultraviolet rays. In addition, since it exhibits long-term weather resistance, the frequency of repairs and the like can be significantly reduced even in a severe use environment.

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) C04B 18:14 C04B 18:14 Z 20:00 20:00 B 24:26 24:26 E 14:48 14:48 D 16:06 16:06 EA B 14:38 14:38 A 14:06 14:06 Z 14:38 14:38 C 14:20 14:20 A 14:02) 14:02) A F term (reference ) 4G012 PA11 PA15 PA19 PA20 PA24 PA28 PB04 PB31 PC08 4J038 AA011 BA252 CB022 CB082 CE062 DH042 HA026 HA066 HA156 HA216 HA446 HA486 HA491 HA536 HA546 HA556 JA35 JB36 JC13 KA08 KA09 KA19 KA20 NA04 NA05 NA10

Claims (9)

[Claims] 1. A road coating material comprising at least a compound containing cement, fine pozzolanic powder, aggregate having a particle size of 2 mm or less, water, and a water reducing agent. 2. The road coating material according to claim 1, wherein the blend contains one or more of metal fibers, organic fibers, and carbon fibers. 3. The metal fiber has a diameter of 0.01 to 1.0 mm,
The road coating material according to claim 2, which is a steel fiber having a length of 2 to 30 mm. 4. The organic fiber has a diameter of 0.005 to 1.0 m.
The road coating material according to claim 2, which is one or more fibers selected from vinylon fiber, polypropylene fiber, polyethylene fiber, and aramid fiber having a length of 2 to 30 mm. 5. The carbon fiber has a diameter of 0.005 to 1.0 m.
The road coating material according to claim 2, wherein the length is 2 to 30 mm. 6. The road coating material according to claim 1, wherein the composition contains an inorganic powder having an average particle size of 3 to 20 μm. 7. The road coating material according to claim 1, wherein the composition contains needle-like particles and / or plate-like particles having an average particle size of 1 mm or less. 8. The road coating material according to claim 1, wherein the composition contains a reflector and / or a pigment. 9. The road coating material according to claim 8, wherein the pigment is titanium oxide.