JP6764639B2 - Road surface repair method and road surface repair kit - Google Patents

Description

The present invention relates to a road surface repair method in which a pothole is generated and a road surface repair kit used for repair.

A paved road surface made of cement concrete or asphalt concrete, or formed by laminating one or more of these and other materials (hereinafter referred to as "road surface" in the present invention) is widely used for highways, general motorways, promenades, parking lots. , Used for runways, parking lots, guideways, etc. The road surface is exposed to wind and rain, antifreeze (chloride) is sprayed in winter, and the road surface is locally damaged due to various factors such as the load applied locally by the wheels, which is called a pothole. A dent like this occurs. If such a dent (hereinafter referred to as "pothole") occurs, the wheel may get stuck in the pothole and the control of the vehicle may be temporarily lost, or the tire may burst, and an accident may occur. ..

For this reason, patrol personnel who have boarded a patrol vehicle or the like regularly inspect whether or not there are potholes on the road surface. In the case of roads, pedestrians may report damage to the road surface.

If a pothole is found, it will be repaired by the person in charge of construction who has been contacted.

As the repair method, a method of spreading the modified asphalt emulsion mixture in a heated state in a pothole (for example, Patent Document 1), and mixing a mixture containing a room temperature curable resin and an aggregate in a bag. (For example, Patent Document 2), a method in which room temperature asphalt pavement material is packed in a bag, the bag is directly put into the pothole, and the tires of a vehicle passing over the bag are used for rolling (for example). Patent Document 3), a method of filling a pothole with a fast-curing cement mortar composition and applying an asphalt-based room temperature curing type slurry material to the surface of the cement mortar composition (for example, Patent Document 4).

Japanese Unexamined Patent Publication No. 2003-105713 JP-A-2002-173909 Japanese Unexamined Patent Publication No. 2004-324161 Japanese Unexamined Patent Publication No. 2010-285849

The repair method according to the prior art has the following problems.

When repairing with an asphalt mixture such as a modified asphalt emulsion mixture or a room temperature asphalt pavement material as in Patent Document 1 and Patent Document 3, the material used for the repair (repair material) and the original road surface are repeatedly passed by a vehicle or the like. It may peel off due to repeated loading and may be damaged again in about 1 week to 1 month. Especially during the snowy season, the road surface is always wet, so that water infiltrates the interface between the repair material and the original road surface, and the repair material is likely to peel off.

As in Patent Document 1, the method of spreading the modified asphalt emulsion mixture in a heated state on the potholes requires a large device such as a heating device or a mixer, and repairs the potholes scattered in a plurality of places. Not suitable for.

As in Patent Document 4, a method of filling a pothole with a quick-hardening cement mortar composition (fast-hardening mortar) and applying an asphalt-based room temperature curing slurry material to the surface of the cement mortar composition is a kneading method of two types. Since it is necessary to knead and manufacture things, the work is complicated and time-consuming.

As in Patent Document 3, the method of packing a room temperature asphalt pavement material in a bag, putting the bag as it is into a pothole, and rolling it with the tires of a vehicle passing over it, requires sufficient pre-filling, that is, Since the bag containing normal temperature asphalt pavement material is filled so that it protrudes from the road surface, there is a risk that the tires will slip or the driver of the vehicle may mistakenly think that it is a falling object and make a mistake in operating the handle, which may cause danger. ..

By the way, on expressways and general motorways, it is said that patrol vehicles can temporarily regulate lanes for inspection and confirmation for up to about 20 minutes.

It is difficult for any of the repair methods of Patent Documents 1 to 4 to be dealt with by one patrol vehicle and a small number of patrol members, and a person in charge of construction will separately deal with them after discovery. Therefore, there is a problem that the usage regulation (traffic regulation) takes a long time.

In consideration of the above problems, filling with a new repair material is being considered. It is an issue that the new repair material satisfies the fluidity in an appropriate range and the difficulty of material separation, and secures sufficient adhesion strength.

The present invention solves the above problems, and an object of the present invention is to provide a road surface repair method capable of repairing with a small number of people and in a short time as compared with the prior art.

The present invention solves the above problems, and an object of the present invention is to provide a road surface repair method capable of repairing a pothole with a small number of people in a short time immediately after the discovery of the pothole.

The present invention for solving the above problems includes a step A of filling a hollow of a road surface with a hard-hardening polymer cement mortar, a step B of spreading an aggregate on the surface of the hard-hardening polymer cement mortar, and a step of spreading the aggregate on the surface of the hard-hardening polymer. It is a road surface repair method characterized by including a C step of embedding in the surface of cement mortar.

As a result, it is possible to repair with a small number of people in a short time.

In the present invention, preferably, a part of the aggregate is exposed in the step C.

As a result, wear resistance, friction resistance, and workability are improved.

In the present invention, preferably, the hard-hardening polymer cement mortar contains cement, hard-hardening material, polymer for cement, fine aggregate and water, and has a water-cement ratio of 25 to 38% and a polymer cement ratio of 3 to 25. % And the fine aggregate cement ratio is 0.5 to 3.3.

As a result, the aggregate is surely embedded in the surface of the hard-hardening polymer cement mortar, and a part of the aggregate is exposed from the surface.

In the present invention, preferably, in the above step (B), the amount of aggregate spread on the surface of the hard-hardening polymer cement mortar is an amount such that the total volume is 2 to 40% of the volume of the recess.

In the present invention, preferably, in the above step (B), the amount of aggregate spread on the surface of the hard-hardening polymer cement mortar is 0.2 to 4.0 cm ³ with respect to the unit opening area (cm ² ). Is.

As a result, the aggregate is surely embedded in the surface of the hard-hardening polymer cement mortar, and a part of the aggregate is exposed from the surface.

In the present invention, preferably, in the above step (B), the aggregate spread on the surface of the hard-hardening polymer cement mortar is an aggregate having a particle size of 3 to 6 mm and a content of 95% by mass or more.

As a result, the aggregate is less likely to peel off and is exposed from the surface. In addition, the risk of peeling can be suppressed.

The present invention, which solves the above problems, comprises a first container containing a predetermined amount of hard-hardening polymer cement mortar powder, a second container containing a predetermined amount of water-based liquid, and a predetermined amount of aggregate. It is a road surface repair kit characterized by including a third container for accommodating the container.

As a result, it is possible to repair with a small number of people in a short time.

According to the repair method of the present invention, repair can be performed by a small number of people and in a short time. As a result, for example, a patrol member who finds a pothole can repair it immediately after patrol.

According to the present invention, it is possible to obtain a safe road surface with a low risk of accidents caused by potholes. Further, according to the present invention, since a short usage regulation (traffic regulation) is sufficient, there is little social or economic loss.

Conceptual diagram of Example / Comparative Example A / Comparative Example B Test construction example Conceptual diagram of construction procedure

~ Construction method ~
In the road surface repair method of the present embodiment, the pot hole is filled with a hard-hardening polymer cement mortar (step A), the aggregate is spread on the surface of the hard-hardening polymer cement mortar (step B), and the aggregate is hard-hardened. Embed in the surface of polymer cement mortar (step C).

Performing the step of determining the volume of the pothole before the filling step (step A) makes it difficult for excess or deficiency of the amount of the hard-hardening polymer cement mortar to be produced, and the aggregate to be added later in step B (additional bone). It is preferable because it is easy to examine the amount of material).

As a method of obtaining the volume of the pothole, it is preferable to roughly measure the area and depth of the pothole and obtain it from the product because the work is easy. As a rough method of measuring the area of a pothole, consider that the upper surface of the pothole approximates a rectangle, measure the length and width with a measure, etc. and calculate the area from the product, and the upper surface of the pothole approximates a circle. Then, there is a method of measuring the shape of the circle with a measure or the like to obtain the area. In addition, as a method of roughly measuring the depth of the pothole, pass a plate or a rod so as to straddle the pothole, and measure the distance from the lower part to the bottom of the pothole, that is, the depth with one or several measures. There are methods such as measuring, and if it seems that there is no difference in the depth of the pothole, measuring the depth of the edge of the pothole with a measure or the like.

Further, before the filling step (step A), a hard-hardening polymer cement mortar is produced. The fast-hardening polymer cement mortar used in the present invention may be produced by kneading with a mixer, or by kneading the container with hands or feet after putting the material in a container such as a plastic bag. May be manufactured. As a container for kneading and manufacturing by kneading the container, if a plastic bag used for storing and transporting a part of hard-hardening polymer cement mortar is used, there is little waste and it does not take time and effort. preferable.

In step A, the method of filling the pothole formed on the road surface with the hard-hardening polymer cement mortar is not particularly limited, but a method of filling by pouring, a method of applying with a spatula or a spatula, a method of pressing with a plate or the like, etc. use a machine. It is preferable because it does not exist.

Further, before filling the hard-hardening polymer cement mortar, it is possible to clean the pot hole, remove the accumulated water, or apply a water absorption adjusting agent or an adhesive called a primer to the road surface and the hard-hardening polymer cement mortar. It is preferable because of its high adhesive strength.

Cleaning the pothole is to remove granular or powdery road surface materials and dust in the pothole, and use a vacuum cleaner, blower, brush, brush, broom, high-pressure water washer, sponge, waste cloth, etc. It is preferable to use it.

It is preferable to remove the accumulated water in the pothole using a vacuum cleaner, a blower, a brush, a brush, a sponge, a waste cloth or the like.

The primer is preferably applied with a brush, brush or sprayer. As the primer to be used, a water absorption adjusting agent composed of a resin emulsion such as an acrylic resin emulsion or an ethylene vinyl acetate resin emulsion, or an adhesive such as an epoxy resin adhesive is preferable.

In step B, the method of spreading the additional aggregate on the surface of the hard-hardening polymer cement mortar is not particularly limited. For example, a method of stroking along the surface of the hard-hardening polymer cement mortar with a hand, sole, board, iron, stick, roller, spatula, brush, brush, etc., so that it is almost even on the surface of the hard-hardening polymer cement mortar. There is a method of sprinkling aggregates.

In step C, the method of partially embedding the additional aggregate on the surface of the fast-hardening polymer cement mortar is not particularly limited. For example, a method of pushing the aggregate on the surface of the hard-hardening polymer cement mortar into the mortar with a hand, a shoe sole, a plate, a iron, a stick, a spatula, a roller or the like can be mentioned.

In step C, a part of the aggregate is exposed.

In step C, the method of embedding the additional aggregate on the surface of the fast-hardening polymer cement mortar may be carried out at the same time as the step of spreading in step B. For example, a method of sprinkling aggregate on the surface of a hard-hardening polymer cement mortar and then pushing it while moving it along the hard-hardening polymer cement mortar surface with a hand, shoe sole, board, iron, rod, spatula, roller, etc. There is a method of pressing the plate against the pothole part with a hand or a foot so as to be substantially parallel to the surface of the cement mortar.

During the steps A to C, it is preferable to regulate the use of a part or all of the road surface to be repaired, such as lane regulation, from the viewpoint of worker safety. It is more preferable to lift the usage regulation after the hard-hardening polymer cement mortar is cured because the mortar is less likely to be deformed by the tire.

~material~
The hard-hardening polymer cement mortar used in the step A contains cement, a hard-hardening material, a polymer for cement, a fine aggregate, and water.

(cement)
As the cement used in the present invention, hydraulic cement or calcium phosphate cement can be preferably used. As the water-hardening cement, various Portland cements and eco-cements of ordinary, early-strength, ultra-fast-strength, low-heat and moderate-heat, and fly ash, blast furnace slag, silica fume or limestone fine powder, etc. are added to these Portland cements or eco-cements. In addition to various mixed cements and the like, ultrafast hard cements such as "Super Jet Cement" (trade name) manufactured by Pacific Cement Co., Ltd. and "Jet Cement" (trade name) manufactured by Sumitomo Osaka Cement Co., Ltd., and alumina cement can be mentioned.

(Stiff material)
The hardened material used in the present invention includes calcium aluminates, nitrites such as calcium nitrite and lithium nitrite, sodium aluminate, alum containing alum, aluminum oxide, aluminum hydroxide, aluminum sulfate and sulfuric acid. It is preferable that the main component is one or more selected from the group of sulfates such as alkalis and hard substances such as calcium nitrate. It is more preferable that the main component is one or more selected from the group of calcium aluminates, sodium aluminate, and sulfates. Of these, those containing calcium aluminates as the main component are particularly preferable.

For calcium aluminates, when CaO is indicated by C, Al ₂ O ₃ is indicated by A, Na ₂ O is indicated by N, and Fe ₂ O ₃ is indicated by F, C ₃ A, C ₂ A, C ₁₂ A ₇ , Calcium aluminate having a mineral composition labeled as C ₅ A ₃ , CA, C ₃ A ₅ or CA _2, etc., calcium aluminoferrite labeled as C ₂ AF, C ₄ AF, etc., calcium aluminate with halogen solidified Calcium haloaluminate containing calcium fluoroaluminate, which is displayed as dissolved or substituted C ₃ A ₃ · CaF ₂ or C ₁₁ A ₇ · CaF _2, etc., is displayed as C ₈ NA ₃ or C ₃ N ₂ A ₅ etc. sodium calcium aluminate, calcium lithium aluminate that, calcium sulfoaluminate such Auin _{(3CaO · 3Al 2 O 3 ·} CaSO 4), ultra rapid setting cement, alumina cement, and _{SiO 2,} K 2 O to these, _Fe 2 O _3. Includes those in which TiO _{2 and the} like are solidified or combined.

The amount of the hardened material added is preferably 3 to 150% by mass with respect to the mass of cement and 3 to 60% by mass with respect to the inorganic binder. Here, the inorganic binder is a hydraulic substance containing cement and gypsum, a latent hydraulic substance such as pozzolan and blast furnace slag powder, a lime-based expansion material, a calcium aluminate-based expansion material, and a lime / calcium aluminate composite expansion material. Say.

When the cement used in the present invention is a hard-hardening cement such as ultrafast-hardening cement or calcium phosphate cement, the hard-hardening material can be omitted because the cement contains a hard-hardening component.

(Polymer for cement)
The polymer for cement in the present invention may be any one used as a binder for polymer cement mortar and polymer cement concrete, and for example, styrene / butadiene copolymer, chloroprene rubber, acrylonitrile / butadiene copolymer or methyl methacrylate / butadiene. Synthetic rubber such as copolymer, natural rubber, polyolefin such as polyethylene and polypropylene, polychloropyrene, polyacrylic acid ester, styrene / acrylic copolymer, all-acrylic copolymer, polyvinyl acetate, vinyl acetate / acrylic copolymer , Vinyl acetate / acrylic acid ester copolymer, modified vinyl acetate, ethylene / vinyl acetate copolymer, ethylene / vinyl acetate / vinyl chloride copolymer, vinyl acetate vinyl versatate copolymer, acrylic / vinyl acetate / beova ( (Commercial name of t-vinyl decanoate) Vinyl acetate resins such as copolymers, unsaturated polyester resins, polyurethane resins, alkyd resins, synthetic resins such as epoxy resins, etc. are preferable examples, and one or two of these may be mentioned. More than a seed can be used. As the polymer for cement in the present invention, the polymer specified in JIS A 6203 “Polymer dispersion for cement admixture and re-emulsified powder resin” is preferable.

The state of the polymer for cement used in the present invention may be either a liquid, a polymer dispersion (including an emulsion), or a re-emulsified powder resin obtained by powdering the polymer dispersion.

The content of the polymer for cement is the mass percentage in terms of non-volatile content (hereinafter referred to as "solid content") at 105 ° C. with respect to the mass of cement, that is, the polymer cement ratio (P / C) is 3 to 25%. It is preferable because the adhesive force between the aggregate embedded in the road surface and step C and the hard-hardening polymer cement mortar is high and it is easy to construct, and more preferably the P / C is 8 to 25%, further 10 to 22%. ..

If the P / C is less than 3%, the adhesion strength may be insufficient, so that the aggregate embedded in the underlying road surface or in step C and the hard-hardening polymer cement mortar may be insufficiently integrated. In addition, the aggregate added later in step B may sink into the hard-hardening polymer cement mortar, and there may be little or no exposed aggregate on the surface of the hard-hardening polymer cement mortar, resulting in an insufficient amount of exposed aggregate. On the other hand, if the P / C exceeds 25%, it is difficult to fill the depression on the road surface. Further, it is difficult to embed the aggregate in the step C.

Further, the unit polymer amount of the cement polymer contained in the fast-hardening polymer cement mortar used in the present invention is set to 50 to 170 kg / m ^{3 in} terms of solid content, which is the aggregate to be embedded in the underlying road surface and step C. It is preferable because it has a high adhesive force to the fast-hardening polymer cement mortar and is easy to install.

If the unit polymer amount is less than 50 kg / m ³ , the adhesion strength is insufficient, so that the aggregate to be embedded in the underlying road surface or in step C and the hard-hardening polymer cement mortar may be insufficiently integrated. Further, the aggregate added later in the step B sinks into the hard-hardening polymer cement mortar, and there is little or no exposed aggregate on the surface of the hard-hardening polymer cement mortar, and the amount of exposed aggregate is insufficient. On the other hand, when the unit polymer amount exceeds 170 kg / m ³ , it is difficult to fill the hollow of the road surface with the hard-hardening polymer cement mortar. Further, it is difficult to embed the aggregate in the step C.

Furthermore, the unit polymer amount is set to 70 to 160 kg / m ^{3 in} terms of solid content because the adhesive strength between the underlying road surface and the aggregate embedded in step C and the fast-hardening polymer cement mortar is higher and easier to construct. It is preferable to do so.

(Fine aggregate)
The fine aggregate contained in the hard-hardening polymer cement mortar used in the present invention is not particularly limited as long as it is used for the cement mortar or the polymer cement mortar. For example, crushed sand, land sand, river sand, sea sand, artificial fine aggregate, cement clinker granules (grains coarser than cement clinker powder commercially available as cement), slag fine aggregate and the like are preferable examples.

In general, an aggregate that has passed through all 10 mm sieves and contains 85% or more by weight of 5 mm or less is called a fine aggregate.

The amount of fine aggregate contained in the fast-hardening polymer cement mortar used in the present invention is 0.5 to 3.3 fine aggregate cement ratio (ratio of fine aggregate mass to cement mass (S / C)). Is preferable.

When the fine aggregate cement ratio is less than 0.5, the aggregate added later in step B sinks into the hard-hardening polymer cement mortar, and there is little or no exposed bone on the surface of the hard-hardening polymer cement mortar. There is a risk that the amount of material will be insufficient. On the other hand, if the fine aggregate cement ratio is larger than 3.3, the fluidity of the fast-hardening polymer cement mortar becomes poor and it is difficult to embed the aggregate in step C, and the aggregate is suddenly embedded in the underlying road surface or in step C. Insufficient integration with hard polymer cement mortar.

Further, since the aggregate added later in step B does not sink too much into the hard-hardening polymer cement mortar and is easily embedded in the hard-hardening polymer cement mortar, and the amount of aggregate exposed from the surface of the hard-hardening polymer cement mortar is sufficient. The amount of fine aggregate contained in the fast-hardening polymer cement mortar is more preferably 1.0 to 3.0 in the fine aggregate cement ratio.

(water)
The water-cement ratio (W / C) of the hard-hardening polymer cement mortar used in the present invention is preferably 25 to 38%.

If the water-cement ratio is less than 25%, the fluidity of the mortar is poor, the filling property into the pothole is poor, and it is difficult to embed the aggregate in step C, and the aggregate is suddenly embedded in the underlying road surface or step C. Insufficient integration with hard polymer cement mortar. If the water-cement ratio exceeds 38%, the mortar strength may be low. Further, the aggregate added later in the step B sinks into the hard-hardening polymer cement mortar, and few of them are exposed on the surface of the hard-hardening polymer cement mortar, so that the amount of exposed aggregate may be insufficient.

Further, since the aggregate added later in step B does not sink too much into the hard polymer cement mortar and is easily embedded in the hard polymer cement mortar, and the amount of aggregate exposed from the surface of the hard polymer cement mortar is sufficient. The water-cement ratio of the hard-hardening polymer cement mortar is more preferably 27 to 35%.

The amount of water when considering the water-cement ratio of the fast-hardening polymer cement mortar takes into consideration the amount of water contained in the admixture material such as polymer dispersion.

(Other)
The hard-hardening polymer cement mortar used in the present invention includes not only cement, hard-hardening material, polymer for cement, fine aggregate and water, but also other admixtures and coarse aggregates as long as the effects of the present invention are not impaired. It can be contained. Other admixtures include, for example, fibers, water reducing agents, retarding agents, curing accelerators, foaming agents, waterproofing agents, rust inhibitors, shrinkage reducing agents, pigments, water repellents, anti-whitening agents, and quick-setting agents ( Materials), hardeners (materials), water retention agents, expansion materials, air entraining agents, surface hardeners, slag powders such as blast furnace slag powder, pozzolans such as silica fume and fly ash, and the like.

(Additional aggregate)
The aggregate (additional aggregate) added later in step B is not particularly limited as long as it is used for concrete, cement mortar or polymer cement mortar. For example, crushed sand, land sand, river sand, sea sand, artificial fine aggregate, cement clinker grains (grains coarser than cement clinker powder commercially available as cement), slag fine aggregate, crushed stone, land gravel, river gravel. , Artificial coarse aggregate, slag coarse aggregate, crushed porcelain, etc. are preferable examples.

Among the aggregates selected from these aggregates, those having a particle size of 3 to 6 mm and containing 95% by mass or more are preferable.

If the particle size is less than 3 mm, the exposure may be insufficient when embedded in a hard-hardening polymer cement mortar. In addition, if a part is exposed, it may peel off from the surface of the hard-hardening polymer cement mortar. On the other hand, if the particle size exceeds 6 mm, when peeled from the surface of the hard-hardening polymer cement mortar, the peeled aggregate may bounce and collide with the car, which is not preferable from the viewpoint of safety.

The amount of aggregate added later in step B is preferably 2 to 40% of the volume of the pothole.

If it is less than 2%, the amount of aggregate exposed (covering ratio) on the surface of the fast-hardening polymer cement mortar becomes small. On the other hand, if it exceeds 40%, it takes time and effort to embed in the step C, the embedding becomes insufficient, and there is a high risk of peeling from the surface of the hard-hardening polymer cement mortar.

Further, since the amount of the aggregate exposed (covering ratio) on the surface of the hard-hardening polymer cement mortar is large, the aggregate can be easily embedded, and the risk of the aggregate peeling off from the surface of the hard-hardening polymer cement mortar is low. The amount of aggregate to be added later in step B is more preferably 5 to 30% of the volume of the pothole, and particularly preferably 10 to 20%.

As another index of the amount of aggregate added later in step B, a volume of 0.2 to 4.0 cm ³ is preferable with respect to the unit opening area (cm ² ) of the pothole.

In addition, it is preferable that most of the aggregates are in contact with each other.

~ Performance evaluation test ~
5 liters of hard-hardening polymer cement mortar having the blending ratio shown in Table 1 was prepared. At this time, the hardened material was mixed in an amount of 67% by mass with respect to the mass of the cement (Ac = C × 67% by mass). The content of the hardened material in the inorganic binder is 40% by mass. In the production, all the materials were put into a metal cylindrical container (capacity: 18 L), and then mixed with a hand mixer (rotation speed: 300 rpm) for 90 seconds. The materials used at this time are shown below. The test piece preparation and kneading were all performed at 20 ° C., and the test was conducted after the temperature of the material used was also 20 ° C.
-Materials used for hard-hardening polymer cement mortar Cement: Ordinary Portland cement (manufactured by Taiheiyo Cement Co., Ltd.) (C)
Hardened material: Calcium aluminumate-based fast-hardening admixture (Ac)
Polymer for cement: Styrene butadiene rubber (manufactured by Pacific Material Co., Ltd., non-volatile content: 45% by mass emulsion)
(P)
Fine aggregate: silica sand (specific gravity: 2.63, FM: 2.89) (S)
Water: Tap water (W)

-Evaluation of finishability A dent of 10 cm in length × 10 cm in width × 10 cm in depth was prepared as a simulated pothole with hard urethane on a concrete flat plate. After filling this recess with a hard-hardening polymer cement mortar, the amount of silica stone shown in Table 1 (100% by mass with a particle size of 3 to 6 mm, bean gravel) is almost evenly applied to the surface of the hard-hardening polymer cement mortar. Scattered in. The silica stone on the surface of the hard-hardening polymer cement mortar was embedded with a trowel so that about half of it was buried in the hard-hardening polymer cement mortar. The filling condition (state) of silica stone (gravel) was visually evaluated as follows.

The evaluation results are shown in Table 2. FIG. 1 is a conceptual diagram of Examples, Comparative Example A, and Comparative Example B.
◯: A part of silica stone (gravel) is buried in the hard-hardening polymer cement mortar, and the silica stone is visible from the surface of the hard-hardening polymer cement mortar (partially exposed). Further, the aggregate exposed from the surface of the hard-hardening polymer cement mortar is in contact with the substantially adjacent aggregate. (Example)
× (A): Most of the silica stone (gravel) is not buried in the hard-hardening polymer cement mortar. (Comparative Example A)
× (B): Most of the silica stone (gravel) sinks in the hard-hardening polymer cement mortar, and almost no silica stone is visible from the surface of the hard-hardening polymer cement mortar. (Comparative Example B)

From the above results, the following findings were obtained regarding the water cement ratio, polymer cement ratio, fine aggregate cement ratio, unit polymer amount, and additional aggregate amount.

・ Water-cement ratio Formulation No. At 3 (W / C = 23%), the evaluation result was × (A). On the other hand, formulation No. At 5 (W / C = 27%), the evaluation result was 〇. From the above results, the water-cement ratio is preferably 25% or more.

Formulation No. 4 (W / C = 45%), Formulation No. 6 (W / C = 60%), Formulation No. At 20 (W / C = 40%), the evaluation result was × (B). On the other hand, formulation No. At 21 (W / C = 35%), the evaluation result was 〇. From the above results, the water-cement ratio is preferably 38% or less.

・ Polymer cement ratio Formulation No. 9 (P / C = 3%), Formulation No. At 7 (P / C = 10%), the evaluation result was 〇. If the polymer cement ratio is less than 3%, sufficient adhesion strength cannot be obtained. From the above results, the polymer cement ratio is preferably 3% or more.

Formulation No. At 10 (P / C = 26%), the evaluation result was × (A). On the other hand, formulation No. At 8 (P / C = 22%), the evaluation result was 〇. From the above results, the polymer cement ratio is preferably 25% or less.

・ Fine aggregate cement ratio Formulation No. 12 (S / C = 4.0), Formulation No. At 16 (S / C = 3.5), the evaluation result was × (A). On the other hand, formulation No. At 15 (S / C = 3.0), the evaluation result was 〇. From the above results, the fine aggregate cement ratio is preferably 3.3 or less.

In addition, No. No. 14 hard-hardening polymer cement mortar (S / C = 2.5) was described as No. Step C (embedding of silica stone) was easier to perform than the hard-hardening polymer cement mortar (S / C = 3.0) of 15.

Formulation No. At 13 (S / C = 0.2), the evaluation result was × (B). On the other hand, formulation No. At 11 (S / C = 1.0), the evaluation result was 〇. From the above results, the fine aggregate cement ratio is preferably 0.5% or more.

・ Unit polymer amount (solid content conversion)
The unit polymer amount is determined by the water cement ratio, the polymer cement ratio, and the fine aggregate cement ratio. Therefore, it is difficult to compare the compounded samples, but it can be used as a comprehensive index.

Formulation No. At 7 (unit polymer amount 70 kg / m ³ ), the evaluation result was 〇. In addition, formulation No. At 10 (unit polymer amount 181 kg / m ³ ), the evaluation result was × (A). On the other hand, formulation No. At 8 (unit polymer amount 156 kg / m ³ ), the evaluation result was 〇.

From the above results, the unit polymer amount is preferably 70 to 160 kg / m ³ .

・ Additional aggregate compounding No. 1 (volume ratio to pothole 10% ≒ volume 1.0 cm ³ / cm ² per unit opening area), formulation No. At 18 (volume fraction to pothole 5% ≈ volume 0.5 cm ³ / cm ² per unit opening area), the evaluation result was 〇. If the volume ratio to the pothole is less than 2% (≈ volume 0.2 cm ³ / cm ² per unit opening area), the effect of additional aggregate exposure described later cannot be obtained. From the above results, it is preferable that the volume ratio with respect to the pothole is 2% or more (≈ volume 0.2 cm ³ / cm ² per unit opening area) or more.

Formulation No. At 19 (volume ratio 50% with respect to pothole ≈ volume 5.0 cm ³ / cm ² per unit opening area), the evaluation result was × (A). On the other hand, formulation No. At 17 (volume ratio of 30% with respect to pothole ≈ equivalent to volume 3.0 cm ³ / cm ² per unit opening area), the evaluation result was 〇. From the above results, it is preferable that the volume ratio with respect to the pothole is 40% or less (≈ volume equivalent to 4.0 cm ³ / cm ² per unit opening area) or less.

~ Test construction ~
The damaged part (pothole) on the surface of the road in front of the parking lot on the highway was targeted for testing, and the damaged part with a diameter of 15 to 20 cm and a depth of 10 cm was repaired. The temperature at the time of construction is 31.6 ° C. Fig. 2 shows the construction status of the damaged part.

The hard-hardening polymer cement mortar was produced by putting a styrene-butadiene rubber emulsion and water in a plastic bag used for storing and transporting the premixed mortar for the mortar, and then pushing the bag by hand to knead. After pouring into the damaged part, an amount of gravel (silica stone), which was 20% of the volume of the pothole, was placed almost evenly on the surface of the hard-hardening polymer cement mortar, and pressed and spread by a holding plate. At this time, the mortar did not adhere to the holding plate, and the surface could be leveled flat. Many of the additional aggregates were in contact with each other. In addition, the mortar was cured 3.5 minutes after water injection. One year has passed since the traffic was released immediately after the construction, but no re-damage due to peeling has occurred.

~ Construction example ~
A construction example will be described using a road patrol as an example. FIG. 3 is a conceptual diagram of the construction procedure. The patrol vehicle is equipped with a repair kit, a hand mixer and a trowel.

The patrol vehicle travels on the road, and patrol personnel discover the pothole. Then temporarily regulate the road and start repair work.

First, the approximate volume of the pothole is measured (step S1).

The repair kit is composed of a container for repair powder containing a predetermined amount of repair powder, a container for repair liquid containing a predetermined amount of repair liquid, and a container for additional aggregate containing a predetermined amount of additional aggregate. To.

Repair powders include cement, hardened materials and fine aggregates. The repair liquid contains water as a main component and a polymer for cement. When using a powdered cement polymer, the repair powder contains the cement polymer.

The standard unit volume of the pothole is set to 1000 cm ³ (1 liter), and the capacity of repair powder, repair liquid, and additional aggregate per kit is set. For example, the formulation No. in Table 1 Refer to 2.

For example, when the measured volume of the pothole is 2000 cm ³ , two sets of repair kits are used. When the measured volume of the pothole is 500 cm ³ , half of each of the repair powder, repair solution, and additional aggregate of the repair kit is used.

A hard-hardening polymer cement mortar is produced using a hand mixer, and the pothole is filled with the hard-hardening polymer cement mortar (step S2 = step A). At this time, the repair liquid may be kneaded into the repair powder container, or the repair powder may be kneaded into the repair liquid container.

Immediately after filling the mortar, additional aggregate is spread on the surface of the hard-hardening polymer cement mortar (step S3 = step B). For example, sprinkle additional aggregate evenly.

At this time, if the pothole is shallow, the amount of additional aggregate may be determined based on the pothole opening area instead of the pothole volume. For example, if the measured volume of the pothole is 500 cm ³ but the depth is about 5 cm, additional aggregate equivalent to 1 kit is used.

By pressing with a trowel, the additional aggregate is partially embedded in the surface of the hard-hardening polymer cement mortar to expose a part (step S4 = step C).

The fast-hardening polymer cement mortar cures in a few minutes. After confirming the hardening of the mortar, the repair work is completed (step S5). And the road regulation is lifted.

A series of work is performed in about 10 minutes. By the way, on expressways and general motorways, it is said that patrol vehicles can temporarily regulate lanes for inspection and confirmation for up to about 20 minutes. Therefore, a series of operations can be completed.

~ Effect 1
The effect of this embodiment will be described.

As described above, this repair method can repair with a small number of people in a short time. As a result, for example, a patrol member who finds a pothole can repair it immediately after patrol.

Furthermore, the risk of accidents caused by potholes is low, that is, a safe road surface can be obtained. In addition, there is little social or economic loss because short usage restrictions (traffic restrictions) are sufficient.

~ Effect 2-
By the way, in the prior art (for example, Patent Documents 1 to 4), the construction surface was flat. Therefore, there are the following problems.

・ Abrasion resistance In the first place, potholes are likely to occur around toll gates and at intersections where there is deceleration / acceleration of the vehicle. Therefore, there is a risk of recurrence at the repaired location. In particular, the conventional technique does not have sufficient wear resistance on the repair surface, so that recurrence is likely to occur.

・ Friction resistance Friction resistance is required at deceleration / acceleration points of vehicles such as around toll gates where potholes are likely to occur. Grooving is often provided on the road surface. If the existing road surface having high frictional resistance is mixed with parts having insufficient frictional resistance such as repaired parts of the prior art, the continuity is lost. When the vehicle passes over the repaired area, the driver feels uncomfortable. Instability becomes apparent especially in motorcycle traffic.

-Workability All the fillers of the conventional technology have high viscosity. Moreover, surface pressing (for example, rolling compaction) is required. As a result, the filler sticks to the trowel or the holding plate, and the workability is not good. In particular, a polymer like the present application has a strong adhesive force.

On the other hand, in this repair method, the aggregate is partially exposed from the repair surface, and the aggregate is in contact with substantially adjacent aggregates. As a result, the following effects can be obtained.

The recurrence of potholes can be suppressed by obtaining sufficient abrasion resistance on the repaired surface.

By obtaining sufficient frictional resistance on the repaired surface, continuity with the existing road surface can be obtained. That is, a safe road surface can be obtained.

In this repair method, since the repair surface is pressed via the additional aggregate, the mortar does not easily stick to the trowel or the holding plate, and the workability is good.

Although the embodiments of the present invention have been shown above, the present invention is not limited to this, and various modifications can be made within the scope of the technical idea of the present invention.

Claims (3)

(A) The process of filling the depressions on the road surface with hard-hardening polymer cement mortar,
(B) A step of spreading the aggregate on the surface of the hard-hardening polymer cement mortar and leveling the aggregate.
(C) The step of embedding the aggregate in the surface of a hard-hardening polymer cement mortar and exposing a part of the aggregate is provided.
In the step (A), the hard-hardening polymer cement mortar contains cement, hard-hardening material, polymer for cement, fine aggregate and water, and has a water-cement ratio of 25 to 38% and a polymer cement ratio of 3 to 25. % And the fine aggregate cement ratio is 0.5 to 3.3.
In the above step (B), the amount of aggregate spread on the surface of the hard-hardening polymer cement mortar is an amount that makes a total volume of 2 to 40% of the volume of the recess.
A road surface repair method characterized in that it does not overlay the surface of the hard-hardening polymer cement mortar . In the step (B), aggregate leveling flooring suddenly hardening polymer cement mortar surface, according to claim 1, the content of the particle size 3~6mm is characterized in that it is a aggregate of more than 95 wt% Road surface repair method. A first container containing a predetermined amount of hard-hardening polymer cement mortar powder,
A second container that contains a predetermined amount of water-based liquid,
A third container that holds a predetermined amount of aggregate,
Equipped with
A road surface repair kit characterized by being used in the road surface repair method according to claim 1 .